Jinsi ya kukokotoa Q Tc
Q Tc ni nini?
Corrected QT interval accounts for heart rate, predicting arrhythmia risk. QTc >460 ms females, >450 ms males increases torsades risk.
Fomula
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
Mwongozo wa Hatua kwa Hatua
- 1Measure QT interval from ECG
- 2Apply Bazett formula: QTc = QT / √RR (RR in seconds)
- 3Or use other formulas for extreme heart rates
Mifano Iliyotatuliwa
Ingizo
QT 420 ms, HR 80 (RR 0.75 s)
Matokeo
QTc ≈ 420/√0.75 ≈ 485 ms (prolonged)
Elevated arrhythmia risk
Makosa ya Kawaida ya Kuepuka
- ✕Using Bazett formula at extreme heart rates (use Fridericia for HR >100)
- ✕Forgetting electrolyte abnormalities (low K, Mg, Ca) prolong QT
Maswali yanayoulizwa mara kwa mara
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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