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Macroencephaly — Clinical Guidelines

Overview

Macrosomia refers to infants born with a birth weight of 4000 grams or more, often associated with increased risks of labor complications, birth trauma, and neonatal injuries 2 3.

Diagnosis

Key Diagnostic Criteria: Birth weight ≥4000 grams 2 3.

Recommended Tests: Ultrasound for fetal weight estimation, though imprecise 6.

Risk Factors: Postdatism (>42 weeks), maternal obesity, gestational diabetes, hypertension, male infant 5.

Management

First-Line Interventions: Close monitoring of labor, readiness for potential cesarean delivery 5.

Adjunctive Measures: Preparation for shoulder dystocia, including specific maneuvers if indicated 7.

No Specific Drug Treatments: Management focuses on obstetric interventions rather than pharmacological treatments 6.

Special Populations

Pregnancy: Elevated maternal vitamin D levels may reduce macrosomia incidence 1.

Comorbidities: Gestational diabetes and maternal obesity are significant risk factors 5.

Key Recommendations

Monitor and manage risk factors such as gestational diabetes and maternal obesity to potentially reduce macrosomia incidence (Evidence: Moderate 5 1).

Prepare for cesarean delivery when macrosomia is suspected due to increased risks of labor abnormalities and birth trauma (Evidence: Expert opinion 5).

Be prepared for shoulder dystocia in cases of suspected macrosomia, given the high risk despite imprecise predictive methods (Evidence: Moderate 6 7).

References

1 Wu JL, Yu L, Guo Y, Chen FY, Feng Z. Second-trimester 25-hydroxyvitamin D status in pregnant women from southern China and risk of macrosomia: a large-scale retrospective cohort study. 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 2022. link 2 . Macrosomia: ACOG Practice Bulletin, Number 216. Obstetrics and gynecology 2020. link 3 . Practice Bulletin No. 173 Summary: Fetal Macrosomia. Obstetrics and gynecology 2016. link 4 Tore HG, McKinney AM, Nagar VA, Lohman B, Truwit CL, Raybaud C. Syndrome of megalencephaly, polydactyly, and polymicrogyria lacking frank hydrocephalus, with associated MR imaging findings. AJNR. American journal of neuroradiology 2009. link 5 Tomić V, Bosnjak K, Petrov B, Dikić M, Knezević D. Macrosomic births at Mostar Clinical Hospital: a 2-year review. Bosnian journal of basic medical sciences 2007. link 6 Sacks DA, Chen W. Estimating fetal weight in the management of macrosomia. Obstetrical & gynecological survey 2000. link 7 . Fetal macrosomia. ACOG Technical Bulletin Number 159--September 1991. International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics 1992. link

Macroencephaly