Quiz: Congenital Heart Defects and Neonatal Management — 22 domande

1. Which feature best distinguishes a cyanotic congenital heart defect from an acyanotic one?

A. Obstruction without any effect on circulation

B. Left-to-right shunting with increased pulmonary flow

C. Right-to-left shunting with systemic desaturation

D. Normal oxygen saturation with a heart murmur

Answer: (C)

Spiegazione

Cyanotic defects cause right-to-left shunting, so deoxygenated blood enters systemic circulation and produces desaturation and cyanosis. Acyanotic defects typically do not cause primary systemic desaturation.

2. What pulmonary blood flow pattern is most typical of cyanotic congenital heart defects?

A. Increased pulmonary blood flow

B. Decreased pulmonary blood flow

C. Normal pulmonary blood flow in all cases

D. Variable flow but never reduced

Answer: (B)

Spiegazione

Cyanotic congenital heart defects are typically associated with decreased pulmonary blood flow. The reduced lung flow contributes to right-to-left shunting and cyanosis.

3. What type of shunt characterizes acyanotic defects with left-to-right shunting?

A. Blood moves equally in both directions

B. Blood moves from pulmonary to systemic circulation

C. Blood bypasses the heart entirely

D. Blood moves from systemic to pulmonary circulation

Answer: (D)

Spiegazione

In left-to-right shunts, blood flows from the systemic side into the pulmonary circulation, increasing pulmonary blood flow. This is the classic pattern for several acyanotic defects.

4. What clinical consequence is most expected when a left-to-right shunt is large?

A. Severe bradycardia without murmur

B. Cardiac failure signs

C. Absent peripheral pulses

D. Immediate cyanosis at birth

Answer: (B)

Spiegazione

A large left-to-right shunt increases pulmonary blood flow and can lead to heart failure features. Cyanosis is not the usual primary finding in acyanotic shunts.

5. Which statement best describes an obstructive acyanotic defect?

A. It blocks blood flow without usually causing cyanosis

B. It always produces severe systemic desaturation

C. It is a defect with no hemodynamic effect

D. It is defined by a right-to-left shunt

Answer: (A)

Spiegazione

Obstructive acyanotic defects impede blood flow but generally do not cause cyanosis. They are classified as acyanotic because primary systemic desaturation is not the usual feature.

6. Which lesion is an example of an obstructive acyanotic defect?

A. Transposition of the great vessels

B. Total anomalous pulmonary venous return

C. Tetralogy of Fallot

D. Aortic stenosis

Answer: (D)

Spiegazione

Aortic stenosis is an obstructive acyanotic lesion because it narrows the aortic outflow without usually causing cyanosis. The other options are cyanotic defects.

7. What pulse pattern is typical of coarctation of the aorta?

A. Absent pulses in both arms and legs

B. Weak upper-limb pulses with bounding femoral pulses

C. Equal pulses in all limbs with no murmur

D. Strong upper-limb pulses with absent or reduced femoral pulses

Answer: (D)

Spiegazione

Coarctation causes reduced blood flow to the lower body, so femoral pulses are absent or diminished while upper-limb pulses may be bounding. This pulse difference is a classic clue.

8. Which finding is most typical of pulmonary stenosis?

A. Ejection systolic murmur at the left second intercostal space

B. Harsh pansystolic murmur at the lower left sternal border

C. Continuous machinery murmur at the left infraclavicular area

D. Opening snap with diastolic rumble at the apex

Answer: (A)

Spiegazione

Pulmonary stenosis typically produces an ejection systolic murmur heard at the left second intercostal space, sometimes with a click or thrill if severe. The other murmur patterns suggest different lesions.

9. What defines a cyanotic congenital heart defect?

A. A defect that causes right-to-left shunting and cyanosis

B. A defect that narrows a valve but never affects oxygenation

C. A defect that causes left-to-right shunting and heart failure

D. A defect that only produces a murmur without desaturation

Answer: (A)

Spiegazione

Cyanotic defects are characterized by right-to-left shunting, which bypasses pulmonary oxygenation and leads to cyanosis. This is the core mechanism behind systemic desaturation.

10. Which clinical sign is most directly explained by systemic desaturation in a cyanotic defect?

A. Bounding femoral pulses

B. A loud continuous machinery murmur

C. Bluish discoloration of the skin and mucous membranes

D. Isolated lower-limb hypertension

Answer: (C)

Spiegazione

Cyanosis results from reduced arterial oxygen saturation and appears as bluish discoloration of the skin and mucous membranes. Bounding femoral pulses are more suggestive of coarctation-related findings.

11. What triggers a hypercyanotic attack in Tetralogy of Fallot?

A. Acute worsening of right-to-left shunting

B. Sudden left-to-right shunt reversal

C. Pulmonary venous obstruction causing edema

D. Valve calcification causing systemic hypertension

Answer: (A)

Spiegazione

Hypercyanotic attacks are cyanotic crises in Tetralogy of Fallot caused by a sudden increase in right-to-left shunting. This sharply worsens hypoxia and cyanosis.

12. Which sequence best matches the respiratory pattern described in severe hypoxia during a hypercyanotic attack?

A. Increased breathing effort, fatigue, primary apnea, restart, last gasp, secondary apnea

B. Slow breathing, wheeze, then isolated cough

C. Sudden apnea, immediate recovery, then persistent hyperventilation

D. Primary apnea followed by fatigue and then normal breathing

Answer: (A)

Spiegazione

The described sequence is increased breathing effort leading to fatigue, then primary apnea, restarting respiration, a last gasp, and finally secondary apnea. This reflects progressive hypoxic deterioration.

13. Why is mixing important in transposition of the great vessels?

A. It replaces the need for ventricular contraction

B. It allows oxygenated and deoxygenated blood to combine and sustain systemic oxygen delivery

C. It causes fetal oxygenation to depend on the placenta after birth

D. It prevents any blood from reaching the lungs

Answer: (B)

Spiegazione

In transposition, the systemic and pulmonary circuits are separated, so mixing is needed for oxygenated blood to reach the body. Without mixing, severe hypoxia occurs.

14. What happens when oxygen exchange fails at the pulmonary level in the newborn with transposition physiology?

A. Placental ischemia becomes the main issue

B. The defect becomes acyanotic

C. Systemic oxygenation improves

D. Hypoxia develops after birth

Answer: (D)

Spiegazione

After birth, the lungs must provide oxygenation; if pulmonary oxygen exchange fails, hypoxia results. In the fetus, the analogous problem is failure of placental exchange.

15. Which situation is a vaccine deferral rather than a permanent contraindication?

A. A history of mild fever after a previous vaccine

B. Immunosuppression requiring postponement of live vaccines

C. A vaccine that is past its expiry date

D. A dose given at the wrong site

Answer: (B)

Spiegazione

Immunosuppression can require deferral of certain live vaccines until immune function has recovered. This is a timing issue rather than a permanent prohibition.

16. Which vaccine group is specifically deferred for at least three months after stopping immunosuppressive therapy?

A. BCG, measles, MMR, and OPV/TOPV

B. Tetanus toxoid and inactivated polio only

C. Oral rotavirus vaccine only

D. Hepatitis B and pneumococcal vaccines

Answer: (A)

Spiegazione

The source states that BCG, measles, MMR, and OPV/TOPV should be deferred for at least three months after cessation of immunosuppression. These are live vaccines with higher risk in immunocompromised patients.

17. What does the source material say about specific breastfeeding benefits?

A. It lists detailed benefits for maternal and infant immunity

B. It gives exact feeding volumes for the first week

C. It recommends avoiding breastfeeding in all infants

D. It does not provide specific breastfeeding benefits

Answer: (D)

Spiegazione

No specific breastfeeding benefits are included in the provided material. The section explicitly notes that feeding and breastfeeding details are missing.

18. Which feeding guidance is included in the source material?

A. No specific feeding schedule or volume guidance is given

B. Exclusive breastfeeding must stop after 2 months

C. All infants require formula supplementation

D. Feeding should be withheld during normal growth

Answer: (A)

Spiegazione

The material does not give feeding volumes, schedules, or technique guidance. It only states that no exam-relevant feeding rule is present in the section.

19. Which feature is most typical of infant heart failure?

A. Isolated fever with runny nose

B. Bradycardia with hypertension only

C. Sudden cyanosis without any congestion signs

D. Tachypnoea with poor feeding and sweating

Answer: (D)

Spiegazione

Infant heart failure commonly presents with tachypnoea, sweating, poor feeding, and failure to thrive. These are classic signs of poor cardiac output and congestion.

20. Which sign is described as an early feature of fluid overload in heart failure?

A. Hypertensive urgency

B. Dependent ankle edema

C. Puffy eyes

D. Clubbing of fingers

Answer: (C)

Spiegazione

Puffy eyes are listed as an early edema sign in infant heart failure, while dependent edema is later. Hepatomegaly may also appear earlier than edema.

21. Which feature best defines marasmus in protein-energy malnutrition?

A. Edema with dermatosis

B. Severe wasting without edema

C. Isolated obesity with normal growth

D. Normal weight with fever

Answer: (B)

Spiegazione

Marasmus is characterized by marked wasting without edema. The presence of edema points toward a more severe wet form of PEM rather than marasmus.

22. What feature is used to indicate more severe protein-energy malnutrition than wasting alone?

A. Mild cough

B. Bounding pulses

C. Normal appetite

D. Oedema

Answer: (D)

Spiegazione

In PEM, edema is a marker of more severe disease than wasting alone. Classification and management intensity increase when edema is present.