QT Prolongation and delayed atrioventricular conduction caused by acute ingestion of trazodone

Figures & data

Fig. 1.  Electrocardiogram 6 hours after trazodone ingestion showing QT prolongation; calibration amplitude 1 cm = 1 mV, strip recording rate 25 mm.sec⁻¹. Heart rate 64 min⁻¹, PR interval 227 ms, QRS 99 ms, QT 513 ms, corrected QT (Bazett's formula) 497 ms.

Fig. 2.  Electrocardiographic intervals after acute trazodone overdose. Broken line indicates upper limit of the normal reference range; QTc represents QT interval corrected for heart rate by Bazett's formula.

Fig. 3.  Haemodynamic variables after acute ingestion of trazodone. Mean blood pressure calculated as diastolic blood pressure + ⅓ (systolic blood pressure – diastolic blood pressure).