Nokea
Toxoplasma gondii infection in humans causes:
- A. Oral ulcers
- B. Cervical lymphadenopathy
- C. Microcephaly
- D. Chorioretinitis
Correct Answer: D
Rationale: Chorioretinitis is a hallmark of congenital toxoplasmosis, leading to vision impairment.
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Type I renal tubular acidosis:
- A. Only occurs in children
- B. Is caused by a failure of ammonium ion secretion
- C. Is associated with renal calcification
- D. Typically leads to hypovolaemia
Correct Answer: B
Rationale: Type I renal tubular acidosis is characterized by a failure in ammonium ion secretion, leading to a failure to acidify urine, which can result in metabolic acidosis.
An adolescent female has a history of repaired tetralogy of Fallot (TOF). Which long-term complication is a concern for this patient?
- A. Aortic stenosis
- B. Chronic cyanosis
- C. Mitral valve prolapse
- D. Ventricular failure
Correct Answer: C
Rationale: Patients with repaired TOF, especially adolescent females, are at risk for mitral valve prolapse.
Obstructed total anomalous pulmonary venous return (TAPVR) is a pediatric surgical emergency because
- A. therapy is usually not effective
- B. severe pulmonary congestion
- C. left atrium may be small
- D. left ventricle may be small
Correct Answer: B
Rationale: Obstructed TAPVR requires immediate surgical intervention due to severe pulmonary congestion.
Which of the following is an example of ductus dependent systemic circulation?
- A. Severe Ebstein's anomaly
- B. Pulmonary atresia
- C. Tricuspid atresia
- D. Interruption of aortic arch
Correct Answer: D
Rationale: Interruption of aortic arch is ductus dependent as it relies on the ductus arteriosus for systemic blood flow.
All of the following are true regarding attention deficit hyperactivity disorder (ADHD), except
- A. Dopamine transporter gene (DAT1) and dopamine 4 receptor gene (DRD4) are implicated in the diagnosis
- B. Impaired fine motor movement and poor coordination are 'soft' but specific signs of ADHD
- C. Developmentally inappropriate behavior must commence before 7 years of age and present for at least 6 months
- D. Maternal lead exposure is associated with ADHD
Correct Answer: B
Rationale: Impaired fine motor movement and poor coordination are not specific signs of ADHD; they are nonspecific and can occur in other conditions.