Table 1.
Changes in electrophysiological measurements with aging
| Variable | SCL (ms) | AH interval (ms) | WBCL (ms) | AVNERP (ms) | AVFRP (ms) |
|---|---|---|---|---|---|
| Young heart (n = 14) | 259.10 ± 12.3 | 41.33 ± 3.60 | 148.70 ± 6.32 | 103.20 ± 7.16 | 141.10 ± 8.87 |
| Old heart (n = 6) | 370.50 ± 23.10 | 63.60 ± 5.144 | 216.80 ± 31.44 | 168.30 ± 6.811 | 184.80 ± 8.2 |
| P | .0002 | .0049 | .0038 | .0002 | .01 |
| 95% CI | 58.19–164.7 | 7.65–36.88 | 25.72–110.4 | 39.03–91.03 | 10.7–75.01 |
AH = Atrio-His; AVFRP = atrioventricular nodal functional refractory period; AVNERP = atrioventricular nodal effective refractory period; CI = confidence interval; SCL = sinus node cycle length; WBCL = Wenkebach cycle length.