Prognostic value of end-tidal CO2 pressure during exercise in patients with left ventricular dysfunction

Table 2 Predictors for cardiac death

Variables	Univariate analysis				Multivariate analysis
Variables	X ²	P value	Hazard ratio	95% CI	X ²	P value	Hazard ratio	95% CI
LVEF	5.73	0.0167	0.924	0.866−0.986	1.95	0.163	0.936	0.852−1.027
Heart rate at peak exercise	6.12	0.0134	0.968	0.943−0.993	2.88	0.090	0.965	0.926−1.006
Systolic blood pressure at peak exercise	7.20	0.0073	0.972	0.952−0.992	0.01	0.936	1.002	0.965−1.040
PETCO₂ at rest	15.47	<0.0001	0.798	0.713−0.893	0.33	0.566	1.079	0.833−1.397
PETCO₂ at peak exercise	17.49	<0.0001	0.815	0.740−0.897	4.73	0.030	0.741	0.566−0.971
Peak \( \dot{\rm{V}} \)O₂	10.08	0.0015	0.789	0.682−0.913	0.60	0.438	0.878	0.631−1.221
Δ\( \dot{\rm{V}} \)O₂/ΔWR	8.23	0.0041	0.772	0.647−0.921	0.35	0.552	1.159	0.712−1.888
\( \dot{\rm{V}} \)E/\( \dot{\rm{V}} \)CO₂ slope	9.54	0.0020	1.052	1.019−1.086	2.07	0.151	0.943	0.871−1.021

ISSN: 1880-6562