🎯 Theme 5 Exam Practice

A child with suspected congenital heart disease undergoes pulse oximetry, ECG, chest radiography and echocardiography. Pulse oximetry confirms hypoxemia, while the chest radiograph shows reduced pulmonary vascular markings. What is the most useful role of echocardiography in this setting?

A child with Ebstein anomaly has exercise intolerance, cyanosis and marked tricuspid regurgitation. Which mechanism most directly explains the cyanosis?

A 3-year-old boy with chronic cyanosis tires earlier than other children during play. His mother says he often stops running and squats for a few minutes before continuing. Which physiological change produced by squatting most directly improves his symptoms?

A 3-year-old child with known Tetralogy of Fallot suddenly becomes deeply cyanosed and tachypneic while crying. The deterioration results primarily from an acute increase in which process?

The parents of a 3-year-old boy with Tetralogy of Fallot ask what they should do if he suddenly becomes much more blue and breathless at home. Which advice is most appropriate?

A child with suspected Tetralogy of Fallot undergoes pulse oximetry and has persistently reduced oxygen saturation while clinically stable. What does this finding most directly indicate?

A child with Tetralogy of Fallot has poor weight gain and becomes fatigued with activity. Which supportive measure is most appropriate while awaiting specialist treatment?

Parents of a child with repaired congenital heart disease believe that surgery means no further cardiovascular follow-up is required. Which response best reflects appropriate long-term care?

A child with central cyanosis and an ejection systolic murmur undergoes echocardiography. Which combination of findings would confirm Tetralogy of Fallot?

A child with confirmed Tetralogy of Fallot is clinically stable after evaluation. Which management plan best addresses the underlying structural problem?

A 3-year-old boy with cyanosis and poor growth is suspected to have a congenital cardiac lesion. Which clinical feature most strongly suggests a lesion with reduced rather than increased pulmonary blood flow?

A 13-year-old child has exertional chest discomfort and near-syncope. Examination reveals an ejection systolic murmur radiating toward the neck. Echocardiography demonstrates congenital obstruction of left ventricular outflow. Which cardiac adaptation is most likely?

A 2-week-old infant develops poor feeding, tachypnea and cool lower extremities. Femoral pulses are markedly weak, while upper-limb pulses remain palpable. Which structural problem best explains this pattern?

A 4-year-old cyanotic child has a chest radiograph showing a cardiac silhouette described as “boot-shaped.” Which underlying structural change contributes most directly to this appearance?

A child with Tetralogy of Fallot has worsening cyanosis during exertion. Which anatomical abnormality most strongly determines how much deoxygenated blood is diverted into the systemic circulation?

A 3-year-old with cyanotic congenital heart disease is awaiting definitive specialist treatment. Which ongoing management approach is most appropriate during follow-up?

A neonate with suspected cyanotic congenital heart disease has persistent low oxygen saturation. There is no prominent murmur. The child is tachypneic and poorly perfused. Which interpretation is most appropriate?

A 4-year-old child with longstanding cyanotic congenital heart disease develops fever, severe headache and new focal neurological weakness. Which complication should be urgently considered?

A 7-year-old child with a previously untreated large ventricular septal defect now has worsening exercise intolerance. Assessment suggests established severe pulmonary vascular disease. Which management implication is most important?

A neonate with transposition of the great arteries initially maintains reasonable systemic oxygenation because an additional fetal vascular connection remains open. Why is preservation of this connection temporarily useful?

A newborn with transposition of the great arteries remains profoundly cyanosed despite oxygen administration. Echocardiography shows very limited communication between the pulmonary and systemic circulations. What is the major physiological problem?

Chest radiography of a cyanotic 3-year-old shows reduced pulmonary vascular markings and a cardiac silhouette suggestive of a boot-shaped heart. Which clinical interpretation is most appropriate?

A child with suspected congenital heart disease develops sudden worsening of cyanosis and rapid breathing while crying. The episode improves after he assumes a squatting position. What is the most appropriate interpretation of this history?

A 3-year-old boy with Tetralogy of Fallot suddenly becomes deeply cyanosed and tachypneic after prolonged crying. He remains conscious but is visibly distressed. What is the most appropriate immediate action?

A 3-year-old boy with cyanotic congenital heart disease is examined during a stable clinic visit. He has central cyanosis and a right ventricular heave but no peripheral edema or hepatomegaly. What is the best interpretation of the absence of these latter findings?

A child with known Tetralogy of Fallot develops a prolonged episode of marked cyanosis associated with lethargy and reduced responsiveness. Which interpretation is most appropriate?

A 12-year-old child is being investigated for persistent hypertension. Blood pressure is substantially higher in the upper limbs than in the lower limbs. Which additional examination finding would best support the suspected cardiovascular diagnosis?

A cyanotic child is being evaluated for congenital heart disease. Which feature would most strongly favor Tetralogy of Fallot over transposition of the great arteries?

An 8-year-old child with an atrial septal defect has a systolic murmur heard at the upper left sternal border. Echocardiography shows increased flow through the right heart. What most directly produces the murmur?

A 3-year-old boy has chronic central cyanosis, clubbing, exertional breathlessness, episodes of worsening cyanosis during crying, and relief by squatting. Examination reveals a right ventricular heave and an ejection systolic murmur at the upper left sternal border. What is the most likely diagnosis?

A 6-year-old child has a very loud pansystolic murmur but is growing normally and has no symptoms of heart failure. Echocardiography demonstrates a small ventricular septal defect. Which explanation best accounts for the loud murmur despite mild hemodynamic disease?

A 3-year-old boy with longstanding cyanosis has a complete blood count showing an increased hemoglobin concentration and hematocrit. Which mechanism best explains these findings?

An infant with suspected congenital heart disease has tachypnea, hepatomegaly, poor feeding and failure to thrive. Oxygen saturation is normal. Which overall physiological pattern best fits these findings?

On examination of a 3-year-old child with chronic cyanosis, the tongue is blue, mild digital clubbing is present, and there is a right ventricular heave. Which additional cardiovascular finding would best support the suspected diagnosis?

A child with central cyanosis, clubbing and exertional dyspnea has a harsh systolic murmur at the left upper sternal border. Which examination finding would most strongly suggest that chronic hypoxemia has been present for a significant period?

A 3-year-old boy has had bluish discoloration of the lips and tongue since infancy. His mother reports that the cyanosis becomes more marked when he cries or runs, and he often squats after exertion. Which historical feature most strongly indicates that his congenital cardiac lesion produces reduced pulmonary blood flow with right-to-left shunting?

A cyanotic neonate has severe respiratory distress and pulmonary congestion. Echocardiography shows that all pulmonary veins drain abnormally into the systemic venous circulation, with narrowing along the anomalous pathway. Which feature explains the marked clinical deterioration?

An infant with truncus arteriosus has mild cyanosis but develops tachypnea, sweating during feeds and poor weight gain. Which hemodynamic abnormality best explains the heart-failure symptoms?

A newborn with tricuspid atresia survives because systemic venous blood reaches the left side of the heart through an atrial communication. What additional physiological requirement must be present for survival?

A 4-month-old infant has tachypnea, sweating during feeds and poor weight gain. Echocardiography shows a large ventricular septal defect with substantial pulmonary blood flow. Which physiological consequence best explains the infant’s symptoms?