Table 2.

Clinical Factors Independently Associated With QTc Prolongation ≥500 ms

	Univariate Analysis			Multivariate Analysis
	OR	95% CI	p Value	OR	95% CI	p Value
Age >65 yrs	2.82	1.67–4.75	<0.001	3.00	1.62–5.54	<0.001
History of congestive heart failure	3.74	1.75–8.01	0.001	4.65	2.01–10.74	<0.001
Body mass index ≥30 kg/m2	0.48	0.30–0.78	0.003	0.45	0.26–0.78	0.005
Peak troponin >0.04 mg/ml	3.10	1.85–5.19	<0.001	3.89	2.22–6.83	<0.001
Admission creatinine ≥1.5 mg/dl	2.42	1.45–4.06	<0.001	2.22	1.28–3.84	0.005
Concomitant use of drugs with known risk of torsade de pointes	1.73	1.04–2.90	0.036	1.51	0.86–2.66	0.154

SI units for creatinine (μmol/l) = mg/dl × 88.4.

SI units for troponin I (μg/l) = ng/ml × 1.

CI = confidence interval; OR = odds ratio; other abbreviation as in Table 1.