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Figure 4 Plot of mean ± SD values of left ventricular ejection fraction obtained in all 12 subjects at the baseline evaluation after at least one week of atrial pacing with normal atrioventricular conduction (BASE), during mid-term (after at least one week) ventricular pacing (MTVP), and 0, 2, 5, 8, 24, and 32 h after cessation of MTVP. *p < 0.007 compared with BASE; p < 0.02 compared with 0 h after cessation of ventricular pacing.