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Meconium aspiration syndrome

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40: 703: 1261: 1249:, including dosages, administration, timing or any drug interactions. Additionally, there is still research being conducted on whether intubation and suctioning of meconium in newborns with MAS is beneficial, harmful or is simply a redundant and outdated treatment. In general, there is still no generally accepted therapeutic protocol and effective treatment plan for MAS. 819:(ECMO) may be utilised in infants who fail to respond to ventilation therapy. While on ECMO, the body can have time to absorb the meconium and for all the associated disorders to resolve. There has been an excellent response to this treatment, as the survival rate of MAS while on ECMO is more than 94%. 262:
As MAS describes a spectrum of disorders of newborns born through MSAF, without any congenital respiratory disorders or other underlying pathology, there are numerous hypothesised mechanisms and causes for the onset of this syndrome. Long-term consequences may arise from these disorders, for example,
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has been used when MSAF was present, which involves a transcervical infusion of fluid during labour. The idea was to dilute the thick meconium to reduce its potential pathophysiology and reduce cases of MAS, since MAS is more prevalent in cases of thick meconium. However, there are associated risks,
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are not frequently associated with MSAF (only approximately 5% in total contain MSAF). The rate of MAS declines in populations where labour is induced in women that have pregnancies exceeding 41 weeks. There are many suspected pre-disposing factors that are thought to increase the risk of MAS. For
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Most infants born through MSAF do not require any treatments (other than routine postnatal care) as they show no signs of respiratory distress, as only approximately 5% of infants born through MSAF develop MAS. However, infants which do develop MAS need to be admitted to a neonatal unit where they
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throughout the third trimester of pregnancy and it is the first intestinal discharge released within the first 48 hours after birth. Notably, since meconium and the whole content of the gastrointestinal tract is located 'extracorporeally,' its constituents are hidden and normally not recognised by
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within their lungs. Therefore, MAS has a wide range of severity depending on what conditions and complications develop after parturition. Furthermore, the pathophysiology of MAS is multifactorial and extremely complex which is why it is the leading cause of morbidity and mortality in term infants.
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aspiration was utilised for 20 years. This treatment was believed to be effective as it was reported to significantly decrease the incidence of MAS compared to those newborns born through MSAF who were not treated. This claim was later disproved and future studies concluded that oropharyngeal and
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Ventilation of infants with MAS can be challenging and, as MAS can affect each individual differently, ventilation administration may need to be customised. Some newborns with MAS can have homogenous lung changes and others can have inconsistent and patchy changes to their lungs. It is common for
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In cases of MAS, there is a need for supplemental oxygen for at least 12 hours in order to maintain oxygen saturation of haemoglobin at 92% or more. The severity of respiratory distress can vary significantly between newborns with MAS, as some require minimal or no supplemental oxygen requirement
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The extent of surfactant inhibition depends on both the concentration of surfactant and meconium. If the surfactant concentration is low, even very highly diluted meconium can inhibit surfactant function whereas, in high surfactant concentrations, the effects of meconium are limited. Meconium may
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are found in samples of MSAF at a higher rate than in clear amniotic fluid, for example 46.9% of patients with MSAF also had endotoxins present. A microbial invasion of the amniotic cavity (MIAC) is more common in patients with MSAF and this could ultimately lead to an intra-amniotic inflammatory
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with MSAF. It is believed that foetal distress develops into foetal hypoxia causing the foetus to defecate meconium resulting in MSAF and then perhaps MAS. Other stressors which causes foetal distress, and therefore meconium passage, includes when umbilical vein oxygen saturation is below 30%.
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and relaxing the anal sphincter, which results in the passage of meconium. Then, because of intrauterine gasping or from the first few breaths after delivery, MAS may develop. Furthermore, aspiration of thick meconium leads to obstruction of airways resulting in a more severe
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of the foetal intestines is present as early as 8 weeks gestation and the anal sphincter develops at about 20–22 weeks. The early control mechanisms of the anal sphincter are not well understood, however there is evidence that the foetus does defecate routinely into the
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even in the absence of distress. The presence of fetal intestinal enzymes have been found in the amniotic fluid of women who are as early as 14–22 weeks pregnant. Thus, suggesting there is free passage of the intestinal contents into the amniotic fluid.
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Respiratory distress in an infant born through the darkly coloured MSAF as well as meconium obstructing the airways is usually sufficient to diagnose MAS. Additionally, newborns with MAS can have other types of respiratory distress such as
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and death. Early intervention and using it on newborns with mild MAS is more effective. However, there are risks as a large volume of fluid instillation to the lung of a newborn can be dangerous (particularly in cases of severe MAS with
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cleavage of lung airway epithelial cells, this is detected by the presence of fragmented DNA within the airways and in alveolar epithelial nuclei. Meconium induces an inflammatory reaction within the lungs as there is an increase of
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Vain, NE; Szyld, EG; Prudent, LM; Wiswell, TE; Aguilar, AM; Vivas, NI (2004). "Oropharyngeal and Nasopharyngeal Suctioning of Meconium-Stained Neonates Before Delivery of their Shoulders: Multicentre, Randomised Controlled Trial".
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formation and oxidative lung injury. However, glucocorticoids may increase the risk of infection and this risk increases with the dose and duration of glucocorticoid treatment. Other issues can arise, such as aggravation of
641:(PPHN) is the failure of the foetal circulation to adapt to extra-uterine conditions after birth. PPHN is associated with various respiratory diseases, including MAS (as 15-20% of infants with MAS develop PPHN), but also 693:
after exposure. After 8 hours of meconium exposure, in rabbit foetuses, the total amount of apoptotic cells is 54%. Therefore, the majority of meconium-induced lung damage may be due to the apoptosis of lung epithelium.
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also increases in later gestations. Therefore, the increased incidence of MAS in post-term pregnancies may reflect the maturation and development of the peristalsis within the gastrointestinal tract in the newborn.
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1 in every 7 pregnancies have MSAF and, of these cases, approximately 5% of these infants develop MAS. MSAF is observed 23-52% in pregnancies at 42 weeks therefore, the frequency of MAS increases as the length of
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Originally, it was believed that MAS developed as a result of the meconium being a physical blockage of the airways. Thus, to prevent newborns, who were born through MSAF, from developing MAS, suctioning of the
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as it causes vasodilation within ventilated areas of the lung thus, decreasing the ventilation-perfusion mismatch and thereby, improves oxygenation. Treatment utilising iNO decreases the need for
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etc.) and other biologically active substances. The anti-inflammatory effect of glucocorticoids is also demonstrated by enhancing the activity of lipocortines which inhibit the activity of PLA
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recognises as a foreign and dangerous substance. The immune system, which is present at birth, responds within minutes with a low specificity and no memory in order to try to eliminate
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nasopharyngeal suctioning, before delivery of the shoulders in infants born through MSAF, does not prevent MAS or its complications. In fact, it can cause more issues and damage (e.g.
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Research is being focused on developing both a successful method for preventing MAS as well as an effective treatment. For example, investigations are being made in the efficiency of
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is an important mechanism in the clearance of injured cells and in tissue repair, however too much apoptosis may cause harm, such as acute lung injury. Meconium induces apoptosis and
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Meconium has a complex chemical composition, so it is difficult to identify a single agent responsible for the several diseases that arise. As meconium is stored inside the
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of infants with MSAF are vigorous at birth and do not have any distress or hypoxia. Additionally, foetal distress occurs frequently without the passage of meconium as well.
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need to be administered as quickly as possible as the effect of these drugs can diminish even just an hour after meconium aspiration. For example, early administration of
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and mortality in newborns with hypoxic respiratory failure and PPHN as a result of MAS. However, approximately 30-50% of infants with PPHN do not respond to iNO therapy.
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and prolongation of labour. The UK National Institute of Health and Clinical Excellence (NICE) Guidelines recommend against the use of amnioinfusion in women with MSAF.
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damage), thus it is not a recommended preventative treatment. Suctioning may not significantly reduce the incidence of MAS as meconium passage and aspiration may occur
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contractile activity. Therefore, non-selective and selective inhibitors of PDE could potentially be used in MAS therapy. However, the use of PDE inhibitors can cause
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and matrix-degrading enzymes. Therefore, these aforementioned mediators within the amniotic fluid during MIAC and intra-amniotic infection could, when aspirated
606:. Surfactant also contributes to lung protection and defence as it is also an anti-inflammatory agent. Surfactant enhances the removal of inhaled particles and 177:. However, the exact mechanism for meconium passage into the amniotic fluid is not completely understood and it may be a combination of several factors. 614:
impact surfactant mechanisms by preventing surfactant from spreading over the alveolar surface, decreasing the concentration of surfactant proteins (
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is found in higher concentrations in post-term than pre-term foetal gastrointestinal tracts. Similarly, intestinal parasympathetic innervation and
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is a medical condition affecting newborn infants. It describes the spectrum of disorders and pathophysiology of newborns born in meconium-stained
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Bassler, D; Choong, K; McNamara, P; Kirpalani, H (2006). "Neonatal Persistent Pulmonary Hypertension Treated with Milrinone: Four Case Report".
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has potential benefits depending on how early it is given in newborns with MAS. This treatment shows promise as it has an effect on air leaks,
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In general, the incidence of MAS has been significantly reduced over the past two decades as the number of post-term deliveries has minimized.
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Carson, BS; Losey, RW; Bowes Jr, WA; Simmons, MA (1976). "Combined Obstetric and Pediatric Approach to Prevent Meconium Aspiration Syndrome".
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example, the risk of MSAF is higher in African American, African and Pacific Islander mothers, compared to mothers from other ethnic groups.
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Czock, D; Keller, F; Rasche, FM; Haussler, U (2005). "Pharmacokinetics and Pharmacodynamics of Systemically Administered Glucocorticoids".
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into the airway. These indicate a direct detrimental effect on lung alveolar cells because of the introduction of meconium into the lungs.
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Zagariya, A; Bhat, R; Chari, G; Uhal, B; Navale, S; Vidyasagar, D (2005). "Apoptosis of Airway Epithelial Cells in Response to Meconium".
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Van Ierland, Y; De Beaufort, AJ (2009). "Why Does Meconium Cause Meconium Aspiration Syndrome? Current Concepts of MAS Pathophysiology".
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Meconium is typically sterile however, it can contain various cultures of bacteria so appropriate antibiotics may need to be prescribed.
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In the first 15 minutes of meconium aspiration, there is obstruction of larger airways which causes increased lung resistance, decreased
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Release of meconium into the amniotic cavity and then intrauterine gasping of post-term neonates may cause meconium aspiration syndrome.
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Marco, P; Nadya, Y; Roselyne, B; Paolo, M; Mostafa, M; De Luca, D (2014). "Lung Ultrasound Findings in Meconium Aspiration Syndrome".
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Prevention during pregnancy may include amnioinfusion and antibiotics but the effectiveness of these treatments are questionable.
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Vain, NE; Batton, DG (2017). "Meconium "Aspiration" (or Respiratory Distress Associated with Meconium-Stained Amniotic Fluid?)".
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are released from neutrophilic granules and these may damage the lung membrane and surfactant proteins. Additionally, activated
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Mokra, D; Mokry, J; Tonhajzerova, I (2013). "Anti-Inflammatory Treatment of Meconium Aspiration Syndrome: Benefits and Risks".
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Thereby making the suctioning redundant and useless as the meconium may already be deep within the lungs at the time of birth.
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X-ray showing the extent of lung epithelial damage in response to meconium seen in neonates with meconium aspiration syndrome.
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The main theories of meconium passage into amniotic fluid are caused by fetal maturity or from foetal stress as a result of
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cells, and other cells. They reduce the migration of neutrophils into the lungs ergo, decreasing their adherence to the
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Romero, R; Yoon, BH; Chaemsaithong, P; Cortez, J; Park, CW; Behnke, RGE; Hassan, SS; Chaiworapongsa, T; Yeo, L (2014).
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and, in severe cases, mechanical ventilation may be needed. The desired oxygen saturation is between 90 and 95% and
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Chettri, S; Bhat, BV; Adhisivam, B (2016). "Current Concepts in the Management of Meconium Aspiration Syndrome".
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The association between foetal distress and meconium passage is not a definite cause-effect relationship as over
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Brooke-Vincent, F (2015). "Meconium Aspiration Syndrome and Persistent Pulmonary Hypertension of the Newborn".
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infants that develop MAS have higher rates of developing neurodevelopmental defects due to poor respiration.
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suctioning is not an ideal preventative treatment for both vigorous and depressed (not breathing) infants.
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Mokra, D; Calkovska, A (2013). "How to Overcome Surfactant Dysfunction in Meconium Aspiration Syndrome".
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suctioning can be used however, the efficacy of this method is in question and it can cause harm.
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may follow. Chronic hypoxia will lead to an increase in pulmonary vascular smooth muscle tone and
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of a newborn with MAS, various isoforms of PDE may be involved due to their pro-inflammatory and
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Foetal hypoxic stress during parturition can stimulate colonic activity, by enhancing intestinal
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therapy. More research needs to be conducted on the pharmacological properties of, for example,
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Poggi, SH; Ghidini, A (2009). "Pathophysiology of Meconium Passage into the Amniotic Fluid".
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have a strong anti-inflammatory activity and works to reduce the migration and activation of
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As inflammation is such a huge issue in MAS, treatment has consisted of anti-inflammatories.
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will be closely observed and provided any treatments needed. Observations include monitoring
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during the period when the fluid-filled lungs transition into an air-filled organ capable of
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sedation and muscle relaxants to be used to optimise ventilation and minimise the risk of
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and epithelial cells that may injure the lung tissue directly or indirectly. For example,
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For the meconium within the amniotic fluid to successfully cause MAS, it has to enter the
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may be as high as 90mmHg. In cases where there is thick meconium deep within the lungs,
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increases, such that the prevalence is greatest in post-term pregnancies. Conversely,
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Meconium is a sticky dark-green substance which contains gastrointestinal secretions,
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Glucocorticoids also possess a genomic mechanism of action in which, once bound to a
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mismatch can trigger PPHN, depending on the concentration of meconium within the
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Stenson, BJ; Smith, CL (2012). "Management of Meconium Aspiration Syndrome".
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Aguilar, AM; Vain, NE (2011). "The Suctioning in the Delivery Room Debate".
505:. Recently, it has been hypothesised that meconium is a potent activator of 2929: 2770: 2450: 2374: 2325: 2282: 2244: 2211:"Glucocorticoids in the Treatment of Neonatal Meconium Aspiration Syndrome" 2188: 2139: 2103: 2025: 1981: 1946: 1876: 1835: 1778: 1718: 1680: 1639: 1604: 1560: 1502: 1386: 1334: 1153: 1122: 1110: 1098: 1043: 992: 975: 957: 945: 898: 844: 836: 824: 785: 579: 556: 482: 324: 146: 2441: 2424: 2163:"Extracorporeal Membrane Oxygenation: Use in Meconium Aspiration Syndrome" 1541: 3273: 3175: 3041: 2743: 2574: 2409: 1242: 1145: 1106: 1046:. Additionally, methylxanthines decreases the concentrations of calcium, 887: 716: 583: 548: 442: 284: 280: 250: 234: 194: 122: 2482: 2179: 2162: 1671: 1654: 1595: 1578: 1441:
Argyridis, S; Arulkumaran, S (2016). "Meconium Stained Amniotic Fluid".
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Choi, HJ; Hahn, S; Lee, J; Park, BJ; Lee, SM; Kin, HS; Bae, CW (2012).
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as it is a potent activator of inflammatory mediators which include
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There may be an important association between foetal distress and
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or infection. Other factors that promote the passage of meconium
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Sehaghatian, MR; Othman, I; Hossain, MM; Vidyasagar, D (2000).
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Rahman, S; Unsworth, J; Vause, S (2013). "Meconium in Labour".
646: 126: 2303: 788:). In general, treatment of MAS is more supportive in nature. 98:
as the sedative effects it had on the foetus were observed by
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The lung areas which do not or only partially participate in
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response. MIAC is associated with high concentrations of
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early in development, MSAF rarely occurs before 34 weeks
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include placental insufficiency, maternal hypertension,
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and cellular debris. Meconium accumulates in the foetal
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eMedicine's article about meconium aspiration syndrome
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Lindenskov, PHH; Castellheim, A; Saugstad, OD (2015).
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side effects. Non-selective PDE inhibitors, such as
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The Journal of Maternal-Fetal and Neonatal Medicine
1410: 1579:"Meconium Aspiration Syndrome: Historical Aspects" 1186:area before delivery of the shoulders followed by 1113:effects. By inhibiting COX, and more specifically 1006: 791: 1523:Swarnam, K; Soraisham, AS; Sivanandan, S (2012). 1443:Obstetrics, Gynaecology and Reproductive Medicine 1413:Obstetrics, Gynaecology and Reproductive Medicine 1062:. Selective PDE inhibitors target one subtype of 602:(to prevent alveolar collapse) and prevents lung 3313: 742: 2346: 1848: 1085: 219:Meconium passage as a result of foetal maturity 181:Meconium passage as a result of foetal distress 1897: 1696: 734: 386:, induce lung inflammation within the foetus. 2629: 331:causing respiratory and circulatory failure. 2051: 1617: 1109:, which exhibit potent pro-inflammatory and 1078:and PDE-7 may become enhanced. For example, 2081: 1652: 1241:agents, surfactant replacement therapy and 16:Medical condition affecting newborn infants 2636: 2622: 2208: 1364: 952:and therefore, decrease the production of 827:associated with dyssynchronous breathing. 566: 303:, collapse of airways and inactivation of 38: 2440: 2364: 2234: 2178: 1866: 1825: 1670: 1594: 1550: 1540: 1492: 433:Meconium is a source of pro-inflammatory 389: 1576: 1367:Seminars in Foetal and Neonatal Medicine 701: 610:cells away from the alveolar structure. 1759:Respiratory Physiology and Neurobiology 1699:Respiratory Physiology and Neurobiology 1140: 897:, the activated complex moves into the 830: 3314: 2256: 2254: 2204: 2202: 2200: 2198: 1999: 1997: 1995: 1993: 1991: 1692: 1690: 1172: 2617: 2160: 2077: 2075: 2047: 2045: 2043: 1752: 1750: 1748: 1746: 1744: 1742: 1740: 1738: 1736: 982:in the bronchoalveolar area, reduced 858: 266: 2908:Infant respiratory distress syndrome 1572: 1570: 1518: 1516: 1514: 1512: 1470: 1468: 1466: 1464: 1436: 1434: 1406: 1404: 1402: 1400: 1398: 1396: 1360: 1358: 1356: 1354: 1352: 1350: 1348: 1346: 1344: 1308: 1306: 1304: 1302: 1300: 1298: 1296: 1294: 1292: 1290: 847:. This is ideal in the treatment of 590:(to allow for lung expansion during 223:Although meconium is present in the 2251: 2195: 1988: 1687: 1529:International Journal of Pediatrics 817:extracorporeal membrane oxygenation 815:may be required. In extreme cases, 13: 2913:Transient tachypnea of the newborn 2072: 2040: 1849:Dargaville, PA; Mills, JF (2005). 1733: 1232: 1101:, to various substances including 866: 796:To clear the airways of meconium, 516:Meconium contains high amounts of 366:monocyte chemoattractant protein-1 257: 14: 3338: 2691:Twin-to-twin transfusion syndrome 2461: 1567: 1509: 1461: 1431: 1393: 1341: 1287: 639:Persistent pulmonary hypertension 634:Persistent Pulmonary Hypertension 539:. Meconium can also activate the 398:, and is partly unexposed to the 329:persistent pulmonary hypertension 310: 3209:Vertically transmitted infection 2275:10.2165/00003088-200544010-00003 2096:10.1016/j.earlhumdev.2011.01.003 1868:10.2165/00003495-200565180-00003 1632:10.1016/j.earlhumdev.2009.09.011 1327:10.1016/j.earlhumdev.2009.09.009 1259: 402:, when it becomes aspirated the 3301:Fetal Alcohol Spectrum Disorder 3251:Group B streptococcal infection 2819:Intrauterine growth restriction 2416: 2381: 2340: 2297: 2154: 2110: 1953: 1918: 1891: 1842: 1793: 1007:Inhibitors of phosphodiesterase 792:Assisted ventilation techniques 90:is derived from the Greek word 72:neonatal aspiration of meconium 33:Neonatal aspiration of meconium 2644:Conditions originating in the 1646: 1611: 1132: 339:Microorganisms, most commonly 1: 2993:Vitamin K deficiency bleeding 2132:10.1016/S0140-6736(04)16852-9 1974:10.1016/S0378-3782(14)50011-4 1280: 1214: 1066:and in MAS the activities of 743:Prevention during parturition 726: 457:), and mediators produced by 3152:Periventricular leukomalacia 2970:Persistent fetal circulation 2918:Meconium aspiration syndrome 2402:10.1016/0002-9378(76)90525-1 2054:Paediatrics and Child Health 1818:10.3109/14767058.2013.844124 1653:Beligere, N; Rao, R (2008). 1086:Inhibitors of cyclooxygenase 843:causing selective pulmonary 758: 697: 672: 578:and is made of a complex of 410:. Meconium perhaps leads to 334: 64:Meconium aspiration syndrome 25:Meconium aspiration syndrome 7: 3061:Intraventricular hemorrhage 2209:Mokra, D; Mokry, J (2011). 1900:Journal of Neonatal Nursing 1252: 735:Prevention during pregnancy 10: 3343: 3066:Germinal matrix hemorrhage 3056:Velamentous cord insertion 2947:Bronchopulmonary dysplasia 2066:10.1016/j.paed.2012.08.015 1771:10.1016/j.resp.2013.02.025 1711:10.1016/j.resp.2013.02.030 1455:10.1016/j.ogrm.2016.05.001 1425:10.1016/j.ogrm.2013.05.007 1379:10.1016/j.siny.2017.04.002 545:platelet-activating factor 323:of certain lung areas and 138:the foetal immune system. 96:juice from the opium poppy 3266: 3201: 3160: 3137: 3109: 3096:Necrotizing enterocolitis 3081: 2978: 2955: 2893: 2886: 2827: 2805:Large for gestational age 2801:Small for gestational age 2793: 2757: 2725: 2699: 2667: 2656: 2565: 2476: 2263:Clinical Pharmacokinetics 2227:10.1007/s00431-011-1453-2 2018:10.1007/s12098-016-2128-9 1939:10.1016/j.lfs.2004.10.033 1912:10.1016/j.jnn.2015.05.002 913:) and protein activator ( 747:As previously mentioned, 501:and accelerated cellular 169:and maternal drug use of 152: 125:, pancreatic secretions, 51: 46: 37: 29: 24: 586:. It functions to lower 3258:Neonatal conjunctivitis 2749:Single umbilical artery 2739:Umbilical cord prolapse 2686:Placental insufficiency 2659:complicating pregnancy, 2167:Journal of Perinatology 2084:Early Human Development 1962:Early Human Development 1659:Journal of Perinatology 1620:Early Human Development 1583:Journal of Perinatology 1315:Early Human Development 1209:umbilical cord prolapse 1169:and lead to mortality. 1165:) as it can exacerbate 974:significantly enhanced 895:glucocorticoid receptor 567:Surfactant inactivation 473:and cytokines generate 428:reactive oxygen species 3234:ureaplasma urealyticum 2942:Wilson–Mikity syndrome 2866:Brachial plexus injury 2306:Biology of the Neonate 1163:pulmonary hypertension 841:vascular smooth muscle 813:mechanical ventilation 784:or the development of 707: 576:type II alveolar cells 439:tumour necrosis factor 390:Pulmonary inflammation 225:gastrointestinal tract 135:gastrointestinal tract 3182:Congenital hypertonia 3073:Anemia of prematurity 2781:Shoulder presentation 2442:10.1038/sj.jp.7200367 1577:Fanaroff, AA (2008). 780:(to detect worsening 705: 3187:Congenital hypotonia 3101:Meconium peritonitis 2903:Intrauterine hypoxia 2859:Subgaleal hemorrhage 1275:Aspiration pneumonia 1141:Surfactant treatment 1093:is metabolised, via 831:Inhaled nitric oxide 782:respiratory acidosis 689:cells and levels of 626:and the shedding of 499:platelet aggregation 412:chemical pneumonitis 404:innate immune system 289:respiratory acidosis 3296:Neonatal withdrawal 3279:Perinatal mortality 3129:Sclerema neonatorum 2985:hematologic disease 2390:Am J Obstet Gynecol 2180:10.1038/jp.2008.152 1672:10.1038/jp.2008.154 1596:10.1038/jp.2008.162 1542:10.1155/2012/359571 1173:Previous treatments 1056:bronchoconstriction 968:Anti-inflammatories 649:. A combination of 541:coagulation cascade 535:and an increase in 495:bronchoconstriction 467:proteolytic enzymes 301:bronchoconstriction 3229:mycoplasma hominis 3214:Neonatal infection 3170:Gray baby syndrome 3147:Perinatal asphyxia 3037:Hyperbilirubinemia 2814:Postterm pregnancy 2661:labour or delivery 2566:External resources 2161:Short, BL (2008). 1024:respiratory system 1012:Phosphodiesterases 1001:growth retardation 859:Antiinflammatories 708: 574:is synthesised by 553:basement membranes 507:toll-like receptor 267:Airway obstruction 143:respiratory system 3309: 3308: 3197: 3196: 3047:Neonatal jaundice 2965:Pneumopericardium 2935:Pneumomediastinum 2876:Klumpke paralysis 2854:Caput succedaneum 2789: 2788: 2657:Maternal factors 2611: 2610: 2366:10.1159/000329822 2318:10.1159/000088192 2221:(12): 1495–1505. 2126:(9434): 597–602. 2012:(10): 1125–1130. 2006:Indian J Paediatr 1933:(16): 1849–1858. 1861:(18): 2569–2591. 1494:10.1159/000369373 1239:anti-inflammatory 1064:phosphodiesterase 989:diabetes mellitus 956:and mediators of 774:oxygen saturation 667:respiratory tract 475:reactive nitrogen 61: 60: 19:Medical condition 3334: 3289:Infant mortality 3124:Erythema toxicum 3116:thermoregulation 3083:Gastrointestinal 2891: 2890: 2887:Affected systems 2764: 2732: 2717:Chorioamnionitis 2710: 2681:Placenta praevia 2674: 2665: 2664: 2638: 2631: 2624: 2615: 2614: 2474: 2473: 2455: 2454: 2444: 2420: 2414: 2413: 2396:(126): 172–175. 2385: 2379: 2378: 2368: 2344: 2338: 2337: 2301: 2295: 2294: 2258: 2249: 2248: 2238: 2206: 2193: 2192: 2182: 2158: 2152: 2151: 2114: 2108: 2107: 2079: 2070: 2069: 2049: 2038: 2037: 2001: 1986: 1985: 1957: 1951: 1950: 1922: 1916: 1915: 1895: 1889: 1888: 1870: 1846: 1840: 1839: 1829: 1797: 1791: 1790: 1754: 1731: 1730: 1694: 1685: 1684: 1674: 1650: 1644: 1643: 1615: 1609: 1608: 1598: 1574: 1565: 1564: 1554: 1544: 1520: 1507: 1506: 1496: 1472: 1459: 1458: 1438: 1429: 1428: 1408: 1391: 1390: 1362: 1339: 1338: 1310: 1269: 1264: 1263: 1262: 1091:Arachidonic acid 1022:and, within the 954:arachidonic acid 933:etc.), enzymes ( 770:respiratory rate 655:vasoconstriction 628:epithelial cells 543:, production of 529:arachidonic acid 491:vasoconstriction 487:Oxidative stress 297:vasoconstriction 214: 213: 209: 78:(MSAF) and have 70:) also known as 42: 22: 21: 3342: 3341: 3337: 3336: 3335: 3333: 3332: 3331: 3312: 3311: 3310: 3305: 3262: 3246:Neonatal sepsis 3193: 3162:Musculoskeletal 3156: 3133: 3114: 3105: 3077: 3032:Hydrops fetalis 2983: 2974: 2951: 2924:Pleural disease 2882: 2844:Cephalohematoma 2823: 2785: 2758: 2753: 2726: 2721: 2700: 2695: 2668: 2660: 2658: 2652: 2642: 2612: 2607: 2606: 2561: 2560: 2485: 2464: 2459: 2458: 2421: 2417: 2386: 2382: 2345: 2341: 2302: 2298: 2259: 2252: 2207: 2196: 2159: 2155: 2115: 2111: 2080: 2073: 2060:(12): 532–535. 2050: 2041: 2002: 1989: 1958: 1954: 1923: 1919: 1896: 1892: 1847: 1843: 1798: 1794: 1755: 1734: 1695: 1688: 1651: 1647: 1626:(10): 607–610. 1616: 1612: 1575: 1568: 1521: 1510: 1473: 1462: 1439: 1432: 1409: 1394: 1363: 1342: 1321:(10): 617–620. 1311: 1288: 1283: 1267:Medicine portal 1265: 1260: 1258: 1255: 1247:glucocorticoids 1235: 1233:Future research 1217: 1175: 1156:, the need for 1143: 1135: 1088: 1040:bronchodilation 1036:methylxanthines 1014:(PDE) degrades 1009: 951: 938: 872:Glucocorticoids 869: 867:Glucocorticoids 861: 833: 809: 794: 761: 745: 737: 729: 700: 675: 636: 588:surface tension 582:, proteins and 569: 526: 521: 518:phospholipase A 392: 377: 374:phospholipase A 337: 313: 293:pulmonary edema 273:lung compliance 269: 260: 258:Pathophysiology 240:amniotic cavity 221: 211: 207: 206: 183: 155: 20: 17: 12: 11: 5: 3340: 3330: 3329: 3324: 3307: 3306: 3304: 3303: 3298: 3293: 3292: 3291: 3286: 3276: 3270: 3268: 3264: 3263: 3261: 3260: 3255: 3254: 3253: 3243: 3238: 3237: 3236: 3231: 3226: 3224:herpes simplex 3221: 3211: 3205: 3203: 3199: 3198: 3195: 3194: 3192: 3191: 3190: 3189: 3184: 3172: 3166: 3164: 3158: 3157: 3155: 3154: 3149: 3143: 3141: 3139:Nervous system 3135: 3134: 3132: 3131: 3126: 3120: 3118: 3107: 3106: 3104: 3103: 3098: 3093: 3087: 3085: 3079: 3078: 3076: 3075: 3070: 3069: 3068: 3058: 3052: 3051: 3050: 3049: 3044: 3034: 3029: 3028: 3027: 3022: 3017: 3012: 3007: 2996: 2995: 2989: 2987: 2976: 2975: 2973: 2972: 2967: 2961: 2959: 2957:Cardiovascular 2953: 2952: 2950: 2949: 2944: 2939: 2938: 2937: 2932: 2920: 2915: 2910: 2905: 2899: 2897: 2888: 2884: 2883: 2881: 2880: 2879: 2878: 2873: 2863: 2862: 2861: 2856: 2851: 2846: 2833: 2831: 2825: 2824: 2822: 2821: 2816: 2807: 2797: 2795: 2791: 2790: 2787: 2786: 2784: 2783: 2778: 2773: 2767: 2765: 2755: 2754: 2752: 2751: 2746: 2741: 2735: 2733: 2729:umbilical cord 2723: 2722: 2720: 2719: 2713: 2711: 2697: 2696: 2694: 2693: 2688: 2683: 2677: 2675: 2662: 2654: 2653: 2641: 2640: 2633: 2626: 2618: 2609: 2608: 2605: 2604: 2593: 2582: 2570: 2569: 2567: 2563: 2562: 2559: 2558: 2547: 2536: 2517: 2502: 2486: 2481: 2480: 2478: 2477:Classification 2471: 2470: 2463: 2462:External links 2460: 2457: 2456: 2435:(4): 257–261. 2415: 2380: 2359:(3): 183–191. 2339: 2296: 2250: 2194: 2153: 2109: 2071: 2039: 1987: 1952: 1917: 1906:(4): 161–167. 1890: 1841: 1812:(8): 775–788. 1792: 1732: 1686: 1645: 1610: 1566: 1508: 1487:(3): 225–230. 1460: 1449:(8): 227–230. 1430: 1419:(8): 247–252. 1392: 1373:(4): 214–219. 1340: 1285: 1284: 1282: 1279: 1278: 1277: 1271: 1270: 1254: 1251: 1234: 1231: 1226:preterm births 1216: 1213: 1202:Historically, 1184:nasopharyngeal 1174: 1171: 1142: 1139: 1134: 1131: 1103:prostaglandins 1095:cyclooxygenase 1087: 1084: 1060:prostaglandins 1032:cardiovascular 1008: 1005: 962:cyclooxygenase 949: 936: 868: 865: 860: 857: 839:(iNO) acts on 832: 829: 807: 793: 790: 760: 757: 753:nasopharyngeal 744: 741: 736: 733: 728: 725: 699: 696: 687:autophagocytic 674: 671: 635: 632: 598:at the end of 568: 565: 524: 519: 479:oxygen species 424:prostaglandins 391: 388: 375: 336: 333: 321:hyperinflation 312: 311:Foetal hypoxia 309: 268: 265: 259: 256: 220: 217: 182: 179: 154: 151: 131:vernix caseosa 107:amniotic fluid 76:amniotic fluid 59: 58: 55: 49: 48: 44: 43: 35: 34: 31: 27: 26: 18: 15: 9: 6: 4: 3: 2: 3339: 3328: 3325: 3323: 3320: 3319: 3317: 3302: 3299: 3297: 3294: 3290: 3287: 3285: 3282: 3281: 3280: 3277: 3275: 3272: 3271: 3269: 3265: 3259: 3256: 3252: 3249: 3248: 3247: 3244: 3242: 3239: 3235: 3232: 3230: 3227: 3225: 3222: 3220: 3217: 3216: 3215: 3212: 3210: 3207: 3206: 3204: 3200: 3188: 3185: 3183: 3180: 3179: 3178: 3177: 3173: 3171: 3168: 3167: 3165: 3163: 3159: 3153: 3150: 3148: 3145: 3144: 3142: 3140: 3136: 3130: 3127: 3125: 3122: 3121: 3119: 3117: 3112: 3108: 3102: 3099: 3097: 3094: 3092: 3089: 3088: 3086: 3084: 3080: 3074: 3071: 3067: 3064: 3063: 3062: 3059: 3057: 3054: 3053: 3048: 3045: 3043: 3040: 3039: 3038: 3035: 3033: 3030: 3026: 3023: 3021: 3018: 3016: 3013: 3011: 3008: 3006: 3003: 3002: 3001: 2998: 2997: 2994: 2991: 2990: 2988: 2986: 2981: 2977: 2971: 2968: 2966: 2963: 2962: 2960: 2958: 2954: 2948: 2945: 2943: 2940: 2936: 2933: 2931: 2928: 2927: 2926: 2925: 2921: 2919: 2916: 2914: 2911: 2909: 2906: 2904: 2901: 2900: 2898: 2896: 2892: 2889: 2885: 2877: 2874: 2872: 2869: 2868: 2867: 2864: 2860: 2857: 2855: 2852: 2850: 2847: 2845: 2842: 2841: 2840: 2839: 2835: 2834: 2832: 2830: 2826: 2820: 2817: 2815: 2811: 2810:Preterm birth 2808: 2806: 2802: 2799: 2798: 2796: 2792: 2782: 2779: 2777: 2774: 2772: 2769: 2768: 2766: 2763: 2762: 2756: 2750: 2747: 2745: 2742: 2740: 2737: 2736: 2734: 2731: 2730: 2724: 2718: 2715: 2714: 2712: 2709: 2708: 2704: 2698: 2692: 2689: 2687: 2684: 2682: 2679: 2678: 2676: 2673: 2672: 2666: 2663: 2655: 2651: 2650:fetal disease 2647: 2639: 2634: 2632: 2627: 2625: 2620: 2619: 2616: 2603: 2599: 2598: 2594: 2592: 2588: 2587: 2583: 2581: 2577: 2576: 2572: 2571: 2568: 2564: 2557: 2553: 2552: 2548: 2546: 2542: 2541: 2537: 2535: 2531: 2527: 2526: 2522: 2518: 2516: 2512: 2511: 2507: 2503: 2501: 2497: 2496: 2492: 2488: 2487: 2484: 2479: 2475: 2469: 2466: 2465: 2452: 2448: 2443: 2438: 2434: 2430: 2426: 2419: 2411: 2407: 2403: 2399: 2395: 2391: 2384: 2376: 2372: 2367: 2362: 2358: 2354: 2350: 2343: 2335: 2331: 2327: 2323: 2319: 2315: 2311: 2307: 2300: 2292: 2288: 2284: 2280: 2276: 2272: 2268: 2264: 2257: 2255: 2246: 2242: 2237: 2232: 2228: 2224: 2220: 2216: 2215:Eur J Pediatr 2212: 2205: 2203: 2201: 2199: 2190: 2186: 2181: 2176: 2172: 2168: 2164: 2157: 2149: 2145: 2141: 2137: 2133: 2129: 2125: 2121: 2113: 2105: 2101: 2097: 2093: 2089: 2085: 2078: 2076: 2067: 2063: 2059: 2055: 2048: 2046: 2044: 2035: 2031: 2027: 2023: 2019: 2015: 2011: 2007: 2000: 1998: 1996: 1994: 1992: 1983: 1979: 1975: 1971: 1967: 1963: 1956: 1948: 1944: 1940: 1936: 1932: 1928: 1927:Life Sciences 1921: 1913: 1909: 1905: 1901: 1894: 1886: 1882: 1878: 1874: 1869: 1864: 1860: 1856: 1852: 1845: 1837: 1833: 1828: 1823: 1819: 1815: 1811: 1807: 1803: 1796: 1788: 1784: 1780: 1776: 1772: 1768: 1764: 1760: 1753: 1751: 1749: 1747: 1745: 1743: 1741: 1739: 1737: 1728: 1724: 1720: 1716: 1712: 1708: 1704: 1700: 1693: 1691: 1682: 1678: 1673: 1668: 1664: 1660: 1656: 1649: 1641: 1637: 1633: 1629: 1625: 1621: 1614: 1606: 1602: 1597: 1592: 1588: 1584: 1580: 1573: 1571: 1562: 1558: 1553: 1548: 1543: 1538: 1534: 1530: 1526: 1519: 1517: 1515: 1513: 1504: 1500: 1495: 1490: 1486: 1482: 1478: 1471: 1469: 1467: 1465: 1456: 1452: 1448: 1444: 1437: 1435: 1426: 1422: 1418: 1414: 1407: 1405: 1403: 1401: 1399: 1397: 1388: 1384: 1380: 1376: 1372: 1368: 1361: 1359: 1357: 1355: 1353: 1351: 1349: 1347: 1345: 1336: 1332: 1328: 1324: 1320: 1316: 1309: 1307: 1305: 1303: 1301: 1299: 1297: 1295: 1293: 1291: 1286: 1276: 1273: 1272: 1268: 1257: 1250: 1248: 1244: 1240: 1230: 1227: 1223: 1212: 1210: 1205: 1204:amnioinfusion 1200: 1198: 1194: 1189: 1185: 1181: 1180:oropharyngeal 1170: 1168: 1164: 1159: 1155: 1151: 1148:with diluted 1147: 1138: 1130: 1128: 1127:hypernatremia 1124: 1120: 1119:peptic ulcers 1116: 1112: 1108: 1104: 1100: 1096: 1092: 1083: 1081: 1077: 1073: 1069: 1065: 1061: 1057: 1053: 1049: 1048:acetylcholine 1045: 1041: 1037: 1033: 1029: 1028:smooth muscle 1025: 1021: 1017: 1013: 1004: 1003:in children. 1002: 998: 994: 990: 985: 981: 977: 973: 972:dexamethasone 969: 965: 963: 959: 955: 947: 943: 939: 932: 928: 924: 920: 916: 912: 908: 904: 903:transcription 901:and inhibits 900: 896: 891: 889: 885: 881: 877: 873: 864: 856: 854: 850: 846: 842: 838: 828: 826: 820: 818: 814: 810: 801: 799: 789: 787: 783: 779: 778:blood glucose 775: 771: 767: 756: 754: 750: 749:oropharyngeal 740: 732: 724: 722: 718: 714: 704: 695: 692: 688: 683: 679: 670: 668: 664: 660: 656: 652: 648: 644: 640: 631: 629: 625: 621: 617: 611: 609: 605: 601: 597: 594:), stabilise 593: 589: 585: 581: 580:phospholipids 577: 573: 564: 562: 558: 554: 550: 546: 542: 538: 534: 530: 522: 514: 512: 508: 504: 500: 496: 492: 488: 484: 480: 476: 472: 468: 464: 460: 456: 452: 448: 444: 440: 436: 431: 429: 425: 421: 417: 413: 409: 405: 401: 400:immune system 397: 387: 385: 382: 378: 371: 367: 363: 359: 355: 351: 346: 342: 341:Gram-negative 332: 330: 326: 322: 318: 308: 306: 302: 298: 294: 290: 286: 282: 278: 274: 264: 255: 252: 248: 244: 241: 236: 232: 230: 226: 216: 203: 201: 196: 191: 188: 178: 176: 172: 168: 167:pre-eclampsia 164: 160: 150: 148: 144: 139: 136: 132: 128: 124: 120: 116: 112: 108: 103: 101: 97: 93: 89: 84: 81: 77: 73: 69: 65: 56: 54: 50: 45: 41: 36: 32: 28: 23: 3174: 2930:Pneumothorax 2922: 2917: 2836: 2829:Birth trauma 2771:Breech birth 2761:presentation 2759: 2727: 2701: 2669: 2595: 2584: 2573: 2549: 2538: 2519: 2504: 2489: 2432: 2428: 2418: 2393: 2389: 2383: 2356: 2352: 2342: 2309: 2305: 2299: 2269:(1): 61–98. 2266: 2262: 2218: 2214: 2170: 2166: 2156: 2123: 2119: 2112: 2087: 2083: 2057: 2053: 2009: 2005: 1968:(2): 41–43. 1965: 1961: 1955: 1930: 1926: 1920: 1903: 1899: 1893: 1858: 1854: 1844: 1809: 1805: 1795: 1765:(1): 52–57. 1762: 1758: 1705:(1): 58–63. 1702: 1698: 1665:: S93–S101. 1662: 1658: 1648: 1623: 1619: 1613: 1586: 1582: 1532: 1528: 1484: 1480: 1446: 1442: 1416: 1412: 1370: 1366: 1318: 1314: 1236: 1218: 1201: 1196: 1176: 1154:pneumothorax 1144: 1136: 1123:hyperkalemia 1107:leukotrienes 1099:lipoxygenase 1089: 1058:, including 1044:vasodilation 1010: 993:osteoporosis 976:gas exchange 966: 958:lipoxygenase 892: 870: 862: 845:vasodilation 837:nitric oxide 834: 825:pneumothorax 821: 802: 795: 786:hypoglycemia 762: 746: 738: 730: 709: 676: 653:, pulmonary 637: 612: 570: 557:interstitium 515: 443:interleukins 437:, including 432: 393: 383: 380: 338: 325:pneumothorax 314: 270: 261: 245: 233: 222: 204: 192: 184: 162: 156: 147:gas exchange 140: 104: 95: 91: 87: 85: 71: 67: 63: 62: 3322:Neonatology 3274:Miscarriage 3176:muscle tone 3042:Kernicterus 2895:Respiratory 2871:Erb's palsy 2776:Asynclitism 2744:Nuchal cord 2575:MedlinePlus 2429:J Perinatol 2353:Neonatology 2173:: S79–S83. 2090:: S13–S15. 1481:Neonatology 1146:Lung lavage 1133:Antibiotics 980:neutrophils 888:endothelium 884:mononuclear 880:eosinophils 876:neutrophils 717:hypercapnia 659:ventilation 592:inspiration 584:saccharides 549:endothelium 509:(TLRs) and 489:results in 481:which have 463:macrophages 459:neutrophils 317:ventilation 285:atelectasis 281:hypercapnia 251:myelination 235:Peristalsis 195:peristalsis 123:cholesterol 57:Neonatology 30:Other names 3316:Categories 3284:Stillbirth 3241:Omphalitis 3202:Infections 3111:Integument 2551:DiseasesDB 2312:(1): 1–5. 1535:: 359571. 1281:References 1243:antibiotic 1215:Prevalence 1150:surfactant 1121:and cause 1111:vasoactive 1097:(COX) and 1052:monoamines 964:pathways. 766:heart rate 727:Prevention 600:expiration 572:Surfactant 511:complement 471:leukocytes 441:(TNF) and 420:complement 396:intestines 370:complement 358:chemokines 345:endotoxins 343:rods, and 305:surfactant 111:bile acids 3327:Syndromes 3010:Anti-Kell 2648:period / 2646:perinatal 2586:eMedicine 1589:: S3–S7. 1222:gestation 1197:in-utero. 1080:Milrinone 759:Treatment 721:pneumonia 713:tachypnea 698:Diagnosis 691:caspase 3 678:Apoptosis 673:Apoptosis 663:perfusion 643:pneumonia 608:senescent 537:apoptosis 503:apoptosis 485:effects. 483:cytotoxic 435:cytokines 416:cytokines 360:(such as 352:(such as 350:cytokines 335:Infection 277:hypoxemia 229:gestation 117:, blood, 100:Aristotle 86:The word 53:Specialty 2980:Bleeding 2671:placenta 2597:Orphanet 2451:10879341 2375:22067375 2334:38587541 2326:16155380 2291:24458998 2283:15634032 2245:21465122 2189:19057615 2148:29268118 2140:15313360 2104:21277716 2026:27206687 1982:25220126 1947:15698862 1885:46969843 1877:16392874 1836:24028637 1787:41008280 1779:23466955 1727:20533996 1719:23473924 1681:19057618 1640:19836908 1605:19057607 1561:22164183 1503:25721501 1387:28411000 1335:19833459 1253:See also 1207:such as 1188:tracheal 835:Inhaled 798:tracheal 563:spaces. 561:alveolar 533:necrosis 408:microbes 275:, acute 163:in utero 94:meaning 92:mÄ“kĹŤnion 88:meconium 80:meconium 3219:rubella 2849:Chignon 2703:chorion 2591:ped/768 2545:D008471 2236:3221844 2034:4723566 1827:5881914 1552:3228378 1193:mucosal 1167:hypoxia 997:atrophy 995:, skin 899:nucleus 651:hypoxia 596:alveoli 247:Motilin 210:⁄ 200:hypoxia 187:hypoxia 175:cocaine 171:tobacco 159:hypoxia 2794:Growth 2707:amnion 2580:001596 2534:770.12 2530:770.11 2500:KB26.0 2449:  2410:984149 2408:  2373:  2332:  2324:  2289:  2281:  2243:  2233:  2187:  2146:  2138:  2120:Lancet 2102:  2032:  2024:  1980:  1945:  1883:  1875:  1834:  1824:  1785:  1777:  1725:  1717:  1679:  1638:  1603:  1559:  1549:  1501:  1385:  1333:  984:oedema 647:sepsis 624:stroma 604:oedema 153:Causes 127:lanugo 3267:Other 3091:Ileus 2838:scalp 2602:70588 2515:P24.0 2330:S2CID 2287:S2CID 2144:S2CID 2030:S2CID 1881:S2CID 1855:Drugs 1783:S2CID 1723:S2CID 1115:COX-2 1076:PDE-5 1072:PDE-4 1068:PDE-3 942:COX-2 911:NF-ÎşB 384:utero 119:mucus 3025:Rh E 3020:Rh D 3015:Rh c 2556:7907 2540:MeSH 2525:9-CM 2447:PMID 2406:PMID 2371:PMID 2322:PMID 2279:PMID 2241:PMID 2185:PMID 2136:PMID 2100:PMID 2022:PMID 1978:PMID 1943:PMID 1873:PMID 1832:PMID 1775:PMID 1715:PMID 1677:PMID 1636:PMID 1601:PMID 1557:PMID 1533:2012 1499:PMID 1383:PMID 1331:PMID 1182:and 1158:ECMO 1125:and 1105:and 1050:and 1042:and 1020:cGMP 1018:and 1016:cAMP 999:and 960:and 946:iNOs 929:and 927:IL-8 923:IL-6 919:IL-1 915:AP-1 907:mRNA 853:ECMO 849:PPHN 776:and 751:and 715:and 657:and 645:and 620:SP-B 618:and 616:SP-A 559:and 551:and 523:(PLA 477:and 455:IL-8 451:IL-6 447:IL-1 426:and 364:and 362:IL-8 354:IL-6 287:and 173:and 115:bile 3113:and 3005:ABO 3000:HDN 2982:and 2521:ICD 2506:ICD 2491:ICD 2437:doi 2398:doi 2361:doi 2357:101 2314:doi 2271:doi 2231:PMC 2223:doi 2219:170 2175:doi 2128:doi 2124:364 2092:doi 2088:87S 2062:doi 2014:doi 1970:doi 1935:doi 1908:doi 1863:doi 1822:PMC 1814:doi 1767:doi 1763:187 1707:doi 1703:187 1667:doi 1628:doi 1591:doi 1547:PMC 1537:doi 1489:doi 1485:107 1451:doi 1421:doi 1375:doi 1323:doi 935:PLA 931:TNF 905:of 806:PaO 682:DNA 368:), 356:), 68:MAS 3318:: 2812:/ 2803:/ 2600:: 2589:: 2578:: 2554:: 2543:: 2532:, 2528:: 2513:: 2510:10 2498:: 2495:11 2445:. 2433:20 2431:. 2427:. 2404:. 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Index


Specialty
amniotic fluid
meconium
Aristotle
amniotic fluid
bile acids
bile
mucus
cholesterol
lanugo
vernix caseosa
gastrointestinal tract
respiratory system
gas exchange
hypoxia
pre-eclampsia
tobacco
cocaine
hypoxia
peristalsis
hypoxia
gastrointestinal tract
gestation
Peristalsis
amniotic cavity
Motilin
myelination
lung compliance
hypoxemia

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