Figure 7.

Ex vivo electrophysiology study. A: ventricular effective refractory period (VERP) was prolonged at postnatal day (P)30 in animals exposed to hypoxia. There was no difference for Wenckebach cycle length (WBCL) or atrioventricular nodal effective refractory period (AVNERP). Data expressed as means ± SE. *P < 0.05 hypoxic (n = 4) versus control (n = 4) via two-tailed t test. B: baseline rhythm during electrophysiology studies is displayed for each animal. C: 100% of hypoxic and 25% of control animals had sinus node dysfunction during the study; significance assessed using chi-squared analysis. *P < 0.05. Biological replicates are shown. ns, not significant.