Prognostic Factors in Acute Methadone Toxicity: A 5-Year Study

Table 3

ECG findings in studied cases ().

	Survivors	Nonsurvivors	value
Prolonged P-R interval; (PR ≥ 200 ms)	17 (12.7%)	2 (11.8%)	N/S
QRS prolongation; (QRS ≥ 120 ms)	8 (6%)	3 (17.6%)	N/S
Prolonged Q-Tc interval; (QTc ≥ 450 ms)	58 (43.3%)	10 (58.8%)	N/S
Left bundle branch block	0	1 (5.9%)	N/S
Right bundle branch block	15 (11.2%)	3 (17.6%)	N/S
Atrial fibrillation	0	2 (11.8%)	0.01
U wave	19 (14.2%)	1 (5.9%)	N/S
Sinus tachycardia	20 (14.9%)	6 (35.3%)	N/S
Premature atrial contraction	1 (0.7%)	0	N/S
Premature ventricular contraction	1 (0.7%)	0	N/S
ST depression	1 (0.7%)	0	N/S
Inversion of T wave	9 (6.7%)	0	N/S

N/S: statistically nonsignificant ().