Medical Emergencies · patient case question
What is the most appropriate next step before restorative treatment is begun?
Patient case: Child with tetralogy of Fallot presenting for a dental examination
Patient: Male, 5 years old
Chief Complaint: Mother: “He needs a check-up and I was told two of his back teeth have cavities.”
Background: Tetralogy of Fallot diagnosed in infancy, NOT yet repaired. Mother reports the pregnancy was unplanned and she took no prenatal vitamins. Episodes of cyanosis on exertion. Followed by a paediatric cardiologist, last seen fourteen months ago.
Vital Signs: BP 92/58 mmHg · HR 108 bpm · SpO₂ 91% on room air · T 98.6°F
Findings: Mild central cyanosis and clubbing of the fingers. Occlusal caries in #B and #I. Generalized plaque. No acute infection.
Show answer and explanation
Correct answer: A. Consult his paediatric cardiologist
- A. CORRECT. An UNREPAIRED cyanotic congenital heart defect places this child in the HIGHEST-RISK category for infective endocarditis under the AHA guidance, and it has been over a year since his last cardiology review with a resting SpO₂ of 91%. The cardiologist confirms his current status, the prophylaxis indication and the dosing, and advises on any limits to treatment. Medical consultation precedes the dental plan — it does not follow it.
- B. Taking the history afterwards inverts the entire process. In a cyanotic cardiac child, the history is what determines whether and how you treat.
- C. A paediatric dentistry referral may well be appropriate later, but the question is one of MEDICAL risk, not behaviour. Referring on without establishing cardiac status simply moves the unanswered question elsewhere.
- D. Prophylaxis is a SINGLE dose given 30 to 60 minutes BEFORE the procedure — amoxicillin 50 mg/kg in a child — not a week-long course. A week of antibiotic is both ineffective as prophylaxis and a driver of resistance.
Note: Prophylaxis is indicated for the highest-risk cardiac categories: prosthetic valves or prosthetic material used in valve repair; previous infective endocarditis; UNREPAIRED cyanotic congenital heart disease; a repair using prosthetic material within the first SIX MONTHS; a repair with a RESIDUAL defect at or adjacent to the prosthetic material; and cardiac transplant recipients with valvulopathy. A SUCCESSFULLY repaired tetralogy with no residual defect and more than six months elapsed needs NO prophylaxis — the contrast between that and this child is the examinable point.
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