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Corrected QT interval accounts for heart rate, predicting arrhythmia risk. QTc >460 ms females, >450 ms males increases torsades risk.
공식
Apply Bazett formula: QTc = QT / √RR (RR in seconds)
- QT
- QT value — Variable used in the calculation
- RR
- RR value — Variable used in the calculation
단계별 가이드
- 1Measure QT interval from ECG
- 2Apply Bazett formula: QTc = QT / √RR (RR in seconds)
- 3Or use other formulas for extreme heart rates
풀어진 예시
입력
QT 420 ms, HR 80 (RR 0.75 s)
결과
QTc ≈ 420/√0.75 ≈ 485 ms (prolonged)
Elevated arrhythmia risk
피해야 할 일반적인 실수
- ✕Using Bazett formula at extreme heart rates (use Fridericia for HR >100)
- ✕Forgetting electrolyte abnormalities (low K, Mg, Ca) prolong QT
자주 묻는 질문
Which drugs prolong QT?
Antiarrhythmics, antipsychotics, antiemetics, fluoroquinolones, and many others. Check before prescribing.
What QTc values are safe?
<450 ms males, <460 ms females normal; 450-480 borderline; >500 ms high torsades risk.
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