FE Clinical Indications & Risk Factors 1 — Questions and Answers
Question 1: Which maternal condition increases the risk of fetal congenital heart disease?
- Hypothyroidism
- Hypertension
- Diabetes mellitus (Correct answer)
- Asthma
Correct answer: Diabetes mellitus
Maternal diabetes mellitus, especially when poorly controlled during early pregnancy, is a significant risk factor for various congenital anomalies, including congenital heart disease (CHD). High glucose levels can disrupt critical stages of fetal cardiac development. Therefore, fetal echocardiography is often indicated in pregnancies complicated by maternal diabetes to screen for these potential issues.
Question 2: What is a common clinical indication for performing fetal echocardiography?
- Previous child with congenital heart disease (Correct answer)
- History of anemia
- Previous C-section
- Low maternal BMI
Correct answer: Previous child with congenital heart disease
A family history of congenital heart disease (CHD), particularly in a previous child, significantly increases the risk of recurrence in subsequent pregnancies. This elevated risk makes fetal echocardiography a crucial screening tool. Identifying such a history allows for targeted prenatal evaluation and counseling to detect potential cardiac anomalies early.
Question 3: Which chromosomal abnormality is most commonly associated with cardiac defects?
- Trisomy 13
- Trisomy 18
- Trisomy 21 (Correct answer)
- Turner syndrome
Correct answer: Trisomy 21
Trisomy 21, also known as Down syndrome, is the chromosomal abnormality most frequently associated with congenital heart defects. Approximately 50% of individuals with Trisomy 21 have some form of heart defect, with atrioventricular septal defects (AVSDs) being particularly common. Therefore, a diagnosis or suspicion of Trisomy 21 is a strong indication for fetal echocardiography.
Question 4: Which fetal finding on routine ultrasound would prompt referral for fetal echocardiography?
- Fetal weight above 90th percentile
- Increased nuchal translucency (Correct answer)
- Mild ventriculomegaly
- Single umbilical artery
Correct answer: Increased nuchal translucency
Increased nuchal translucency (NT) thickness on a first-trimester ultrasound is a well-established soft marker for various fetal anomalies, including chromosomal abnormalities and congenital heart disease. Even in the absence of a chromosomal defect, a significantly increased NT measurement is independently associated with an elevated risk of major cardiac defects. Consequently, it warrants a referral for a detailed fetal echocardiogram.
Question 5: Why is lupus in the mother a concern in fetal cardiology?
- Increased risk of fetal macrosomia
- Associated with fetal arrhythmias (Correct answer)
- Fetal thyroid enlargement
- Increased amniotic fluid
Correct answer: Associated with fetal arrhythmias
Maternal systemic lupus erythematosus (SLE), particularly when anti-Ro/SSA and anti-La/SSB antibodies are present, can lead to fetal heart block and other arrhythmias. These antibodies can cross the placenta and damage the fetal cardiac conduction system. Fetal echocardiography is essential for monitoring the fetal heart rhythm and structure in these high-risk pregnancies.
Question 6: Which twin condition increases the risk for congenital heart defects?
- Monoamniotic twins
- Discordant growth
- Twin-to-twin transfusion syndrome (Correct answer)
- Separate placentas
Correct answer: Twin-to-twin transfusion syndrome
Twin-to-twin transfusion syndrome (TTTS) is a serious complication of monochorionic twin pregnancies where there is an unequal sharing of blood between the fetuses. This imbalance can lead to significant cardiovascular strain on both the donor and recipient twin, increasing their risk for various congenital heart defects and cardiac dysfunction. Fetal echocardiography is vital for monitoring cardiac health in these pregnancies.
FE Clinical Indications & Risk Factors 1
Which maternal condition increases the risk of fetal congenital heart disease?