Fetal alcohol syndrome

5,623views

00:00 / 00:00

High Yield Notes

15 pages

Flashcards

Fetal alcohol syndrome

of complete

Questions

USMLE® Step 1 style questions USMLE

of complete

A 1-day-old male infant is brought to the newborn nursery two hours after birth. He was born via vaginal delivery at 38 weeks gestation. The infant’s mother did not receive prenatal care. Family history is unremarkable for hereditary disorders. Weight and length are at the 5th percentile. Vitals are within normal limits. Physical examination reveals microcephaly, short palpebral fissures, a thin vermillion border, and a smooth philtrum. A harsh holosystolic murmur is heard at the lower left sternal border on cardiac auscultation. This infant’s physical exam findings are most likely secondary to in-utero exposure to which of the following?  

External References

First Aid

2024

2023

2022

2021

Atrial septal defect (ASD) p. 303

fetal alcohol syndrome p. 304

Developmental delay

fetal alcohol syndrome p. 633

Facies

in fetal alcohol syndrome p. 634

Fetal alcohol syndrome p. 304, 632, 633

holoprosencephaly in p. 501

Holoprosencephaly p. 501

fetal alcohol syndrome p. 633

Intellectual disability

fetal alcohol syndrome p. 633

Microcephaly

fetal alcohol syndrome p. 633

Patent ductus arteriosus (PDA)

fetal alcohol syndrome p. 304

Tetralogy of Fallot p. 302

fetal alcohol syndrome p. 304

Ventricular septal defect (VSD) p. 303, 731

fetal alcohol syndrome p. 304

Transcript

Watch video only

Fetal alcohol syndrome, or FAS, occurs because of maternal use of alcohol during pregnancy.

It’s currently the leading cause of intellectual disability in the US and can cause characteristic physical abnormalities.

Normally, the fetus is connected to the placenta by the umbilical cord, so the fetus gets oxygen and nutrients from the mother.

Unfortunately, ethanol and toxic alcohol metabolites like acetaldehyde also pass freely through the placenta, but the fetal liver doesn’t have the necessary enzymes to metabolize them, so they build up inside the fetus really fast.

In FAS, ethanol interferes with cell division and proliferation, cell growth and differentiation, and with the migration of mature cells to their final location in the developing embryo, which affects the development of various fetal tissues, including the brain.

Alcohol-induced brain damage includes partial or complete agenesis of the corpus callosum, which links the two hemispheres together, so it either forms incompletely, or not at all.

This causes intellectual disability and seizures.

When the frontal cortex and the hippocampus are affected, this causes poor memory and communication skills, as well as intellectual disability.

The cerebellum can also be smaller in size, called hypoplasia, leading to trouble with movement and balance.

The most common symptom of FAS is growth retardation, resulting in low height and weight.

Summary

Fetal alcohol spectrum disorder (FASD) is an umbrella term describing the range of effects that can occur in a person whose mother drank alcohol during pregnancy. FASD can include physical, behavioral, and intellectual disabilities.

There is no safe level of alcohol consumption during pregnancy, and drinking any amount can cause FASD. FASD is 100% preventable if women don't drink alcohol during pregnancy. If a woman does drink alcohol during pregnancy, there is no way to know for sure how her child will be affected.

Sources

  1. "Robbins Basic Pathology" Elsevier (2017)
  2. "Harrison’s principles of internal medicine" McGraw Hill Education / Medical (2018)
  3. "Pathophysiology of Disease: An Introduction to Clinical Medicine 8E" McGraw-Hill Education / Medical (2018)
  4. "Diagnostic and Statistical Manual of Mental Disorders (DSM-5 )" American Psychiatric Association (2013)
Elsevier

Copyright © 2024 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

Cookies are used by this site.

USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.

RELX