QTc Normal Value — FRCA Primary MCQ

Instant feedback + full explanation. One question, done properly.

ModeratePhysiology - CardiovascularQTc Normal ValueFRCA Primary

The normal QT interval corrected for heart rate (QTc) should be less than:

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: E — 440 ms

Normal QTc (corrected using Bazett's formula: QTc = QT/√RR) should be less than 440 ms (some sources use 450 ms for males / 460 ms for females). Prolonged QTc increases risk of torsades de pointes. Drugs that prolong QT include: ondansetron / droperidol / haloperidol / amiodarone / sotalol / erythromycin.

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist