Severe left ventricular dilatation was an independent predictor of sudden cardiac death (OR 2.5; 95% CI 1.03-5.9; P=0.04), independent of left ventricular ejection fraction.
Case-Control (n=747)
Does severe left ventricular dilatation predict sudden cardiac death independently of left ventricular ejection fraction?
Severe left ventricular dilatation on echocardiography is an independent predictor of sudden cardiac death and additively increases risk when combined with a low ejection fraction.
Odds Ratio: 2.5 (95% CI 1.03–5.9)
p-value: p=0.04
BACKGROUND: Left ventricular (LV) diameter is routinely measured on the echocardiogram but has not been jointly evaluated with the ejection fraction (EF) for risk stratification of sudden cardiac death (SCD). METHODS AND RESULTS: From a large ongoing community-based study of SCD (The Oregon Sudden Unexpected Death Study; population ≈1 million), SCD cases were compared with geographic controls. LVEF and LV diameter, measured using the LV internal dimension in diastole (categorized as normal, mild, moderate, or severe dilatation using American Society of Echocardiography definitions) were assessed from echocardiograms prior but unrelated to the SCD event. Cases (n=418; 69.5±13.8 years), compared with controls (n=329; 67.7±11.9 years), more commonly had severe LV dysfunction (EF ≤35%; 30.5% versus 18.8%; P<0.01) and larger LV diameter (52.2±10.5 mm versus 49.7±7.9 mm; P<0.01). Moderate or severe LV dilatation (16.3% versus 8.2%; P=0.001) and severe LV dilatation (8.1% versus 2.1%; P<0.001) were significantly more frequent in cases. In multivariable analysis, severe LV dilatation was an independent predictor of SCD (odds ratio 2.5 95% CI 1.03 to 5.9; P=0.04). In addition, subjects with both EF ≤35% and severe LV dilatation had higher odds for SCD compared with those with low EF only (odds ratio 3.8 95% CI 1.5 to 10.2 for both versus 1.7 95% CI 1.2 to 2.5 for low EF only), suggesting that severe LV dilatation additively increased SCD risk. CONCLUSION: LV diameter may contribute to risk stratification for SCD independent of the LVEF. This readily available echocardiographic measure warrants further prospective evaluation.
Narayanan et al. (Tue,) conducted a case-control in Sudden cardiac death (n=747). Severe left ventricular dilatation vs. Absence of severe left ventricular dilatation was evaluated on Sudden cardiac death (OR 2.5, 95% CI 1.03-5.9, p=0.04). Severe left ventricular dilatation was an independent predictor of sudden cardiac death (OR 2.5; 95% CI 1.03-5.9; P=0.04), independent of left ventricular ejection fraction.