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Meconium aspiration syndrome — Clinical Guidelines

Overview

Meconium aspiration syndrome (MAS) occurs when meconium-stained amniotic fluid is inhaled by the fetus or neonate, leading to respiratory distress, inflammation, and potential long-term pulmonary sequelae 1 20.

Diagnosis

Presence of thick meconium-stained amniotic fluid 2 19.

Respiratory distress at birth with signs of chemical pneumonitis 20.

Clinical features include tachypnea, cyanosis, and coarse breath sounds 20.

Chest X-ray often shows patchy infiltrates or atelectasis 20.

Blood gas analysis may reveal hypoxemia and respiratory acidosis 20.

Management

Initial Management:

- Immediate suctioning of upper airway meconium to prevent further aspiration 4 24 30. - Continuous positive airway pressure (CPAP) or surfactant therapy for respiratory support 10 16 21.

Supportive Care:

- Mechanical ventilation if CPAP fails 21 22. - Extracorporeal membrane oxygenation (ECMO) for severe cases with refractory hypoxemia 12 22.

Adjunctive Therapies:

- Surfactant lavage to improve lung function 10 16 14. - Consideration of partial liquid ventilation post surfactant lavage 14. - Dexamethasone may have potential benefits in experimental models, but human data are limited 17.

Special Populations

Pregnancy: Avoidance of postterm pregnancies and improved intrapartum monitoring reduce MAS incidence 1 7.

Pediatrics: Early intervention with surfactant therapy and ECMO improves outcomes in severe cases 10 12.

Comorbidities: Infants with thick meconium-stained amniotic fluid have higher risk of MAS and associated complications like persistent pulmonary hypertension of the newborn (PPHN) 8 9.

Key Recommendations

Perform immediate pharyngeal suctioning in infants with meconium-stained amniotic fluid to reduce MAS incidence (Evidence: Strong 30).

Use surfactant therapy as a first-line adjunctive treatment for respiratory support in severe MAS (Evidence: Moderate 10 16).

Consider ECMO for infants with severe MAS and refractory hypoxemia (Evidence: Moderate 12).

Avoid postterm pregnancies and enhance intrapartum monitoring to prevent MAS (Evidence: Moderate 1 7).

Implement combined obstetric and pediatric interventions, including routine intrapartum suctioning, to improve outcomes (Evidence: Expert opinion 18).

References

1 Xu H, Wei S, Fraser WD. Obstetric approaches to the prevention of meconium aspiration syndrome. Journal of perinatology : official journal of the California Perinatal Association 2008. link 2 Ahanya SN, Lakshmanan J, Morgan BL, Ross MG. Meconium passage in utero: mechanisms, consequences, and management. Obstetrical & gynecological survey 2005. link 3 Kabbur PM, Herson VC, Zaremba S, Lerer T. Have the year 2000 neonatal resuscitation program guidelines changed the delivery room management or outcome of meconium-stained infants?. Journal of perinatology : official journal of the California Perinatal Association 2005. link 4 Castellheim A, Pharo A, Fung M, Saugstad OD, Mollnes TE. Complement C5a is a key mediator of meconium-induced neutrophil activation. Pediatric research 2005. link 5 Petrikovsky B. In utero meconium suctioning may prevent meconium aspiration. Fetal diagnosis and therapy 2004. link 6 Shin JH, Shim JD, Kim HR, Sinn JB, Kook JK, Lee JN. Rothia dentocariosa septicemia without endocarditis in a neonatal infant with meconium aspiration syndrome. Journal of clinical microbiology 2004. link 7 Gelfand SL, Fanaroff JM, Walsh MC. Controversies in the treatment of meconium aspiration syndrome. Clinics in perinatology 2004. link 8 Lin HC, Su BH, Lin TW, Peng CT, Tsai CH. Risk factors of mortality in meconium aspiration syndrome: review of 314 cases. Acta paediatrica Taiwanica = Taiwan er ke yi xue hui za zhi 2004. link 9 Hsieh TK, Su BH, Chen AC, Lin TW, Tsai CH, Lin HC. Risk factors of meconium aspiration syndrome developing into persistent pulmonary hypertension of newborn. Acta paediatrica Taiwanica = Taiwan er ke yi xue hui za zhi 2004. link 10 Szymankiewicz M, Gadzinowski J, Kowalska K. Pulmonary function after surfactant lung lavage followed by surfactant administration in infants with severe meconium aspiration syndrome. The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians 2004. link 11 Yoder BA, Kirsch EA, Barth WH, Gordon MC. Changing obstetric practices associated with decreasing incidence of meconium aspiration syndrome. Obstetrics and gynecology 2002. link01942-7) 12 Gill BS, Neville HL, Khan AM, Cox CS, Lally KP. Delayed institution of extracorporeal membrane oxygenation is associated with increased mortality rate and prolonged hospital stay. Journal of pediatric surgery 2002. link 13 Meydanli MM, Dilbaz B, Calişkan E, Dilbaz S, Haberal A. Risk factors for meconium aspiration syndrome in infants born through thick meconium. International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics 2001. link00265-4) 14 Nakamura T, Matsuzawa S, Sugiura M, Tamura M. A randomised control study of partial liquid ventilation after airway lavage with exogenous surfactant in a meconium aspiration syndrome animal model. Archives of disease in childhood. Fetal and neonatal edition 2000. link 15 Korhonen KO, Seppänen MP, Kero PO, Kääpä PO. Delayed adaptation of the pulmonary hemodynamics in infants with mild to moderate meconium aspiration syndrome. The Journal of pediatrics 1999. link70464-6) 16 Ohama Y, Ogawa Y. Treatment of meconium aspiration syndrome with surfactant lavage in an experimental rabbit model. Pediatric pulmonology 1999. link1099-0496(199907)28:1<18::aid-ppul4>3.0.co;2-o) 17 Khan AM, Shabarek FM, Kutchback JW, Lally KP. Effects of dexamethasone on meconium aspiration syndrome in newborn piglets. Pediatric research 1999. link 18 Chishty AL, Alvi Y, Iftikhar M, Bhutta TI. Meconium aspiration in neonates: combined obstetric and paediatric intervention improves outcome. JPMA. The Journal of the Pakistan Medical Association 1996. link 19 Houlihan CM, Knuppel RA. Meconium-stained amniotic fluid. Current controversies. The Journal of reproductive medicine 1994. link 20 Katz VL, Bowes WA. Meconium aspiration syndrome: reflections on a murky subject. American journal of obstetrics and gynecology 1992. link91856-6) 21 Roberton NR. The management of meconium aspiration syndrome. The Turkish journal of pediatrics 1991. link 22 Graves ED, Loe WA, Redmond CR, Falterman KW, Arensman RM. Extracorporeal membrane oxygenation as treatment of severe meconium aspiration syndrome. Southern medical journal 1989. link 23 Swaminathan S, Quinn J, Stabile MW, Bader D, Platzker AC, Keens TG. Long-term pulmonary sequelae of meconium aspiration syndrome. The Journal of pediatrics 1989. link80551-7) 24 Hageman JR, Conley M, Francis K, Stenske J, Wolf I, Santi V et al.. Delivery room management of meconium staining of the amniotic fluid and the development of meconium aspiration syndrome. Journal of perinatology : official journal of the California Perinatal Association 1988. link 25 Karlson KH, Du Rant RH. High frequency positive pressure ventilation in experimental meconium aspiration syndrome. The American journal of the medical sciences 1986. link 26 Gage JE, Taeusch HW, Treves S, Caldicott W. Suctioning of upper airway meconium in newborn infants. JAMA 1981. link 27 Schussman LC. Pathophysiology and prevention of meconium aspiration syndrome. The Journal of family practice 1980. link 28 Marshall R, Tyrala E, McAlister W, Sheehan M. Meconium aspiration syndrome. Neonatal and follow-up study. American journal of obstetrics and gynecology 1978. link 29 Bacsik RD. Meconium aspiration syndrome. Pediatric clinics of North America 1977. link33457-5) 30 Carson BS, Losey RW, Bowes WA, Simmons MA. Combined obstetric and pediatric approach to prevent meconium aspiration syndrome. American journal of obstetrics and gynecology 1976. link90525-1) 31 Vidyasagar D, Harris V, Pildes RS. Assisted ventilation in infants with meconium aspiration syndrome. Pediatrics 1975. link 32 Fox WW, Berman LS, Downes JJ, Peckham GJ. The therapeutic application of end-expiratory pressure in the meconium aspiration syndrome. Pediatrics 1975. link

Meconium aspiration syndrome