Table II.
Evaluation of surface ECG parameters, transesophageal recording and atrial stimulation.
| Sham (n=10) |
SP (n=17) |
|
|---|---|---|
| Heart beat (bpm) | 450±24.5 | 433.8±21.6 |
| SCL (msec) | 133.8±7.4 | 138.5±6.9 |
| PR interval (msec) | 43.6±1.3 | 40.9±5.5 |
| QRS duration (msec) | 18.6±0.5 | 19.3±1.5 |
| QT duration (msec) | 51.7±1.3 | 50.9±1.3 |
| Transesophageal recording and fixed rate pacing | ||
| WP (msec) | 77.8±2.0 | 76.9±3.6 |
| SNRT (msec) | 178.4±18.6 | 183.3±8.7 |
| SACT (msec) | 22.3±1.9 | 22.4±1.7 |
| Programmed atrial stimulation | ||
| AVNRP (S1S2), S1S1 120 msec | 70.5±0.9 | 65.2±2.0a |
| AVNRP (S1S2), S1S1 110 msec | 69.5±0.93 | 65.1±1.9a |
| AVNRP (S1S2), S1S1 100 msec | 69.25±1.0 | 64.4±1.8a |
| ARP (S1S2), S1S1 120 msec | 58.5±2.4 | 48.3±2.7a |
| ARP (S1S2), S1S1 110 msec | 56.8±2.3 | 50.1±3.1a |
| ARP (S1S2), S1S1 100 msec | 56.5±2.0 | 46.4±3.8a |
a
P<0.05 vs. Sham. Sham, sham-operated rats; SP, rats with sterile pericarditis; ECG, electrocardiogram; SCL, sinus cycle length; WP, Wenckebach periodicity; SNRT, sinus node recovery time; SACT, rate corrected SNRT; AVNRP, atrioventricular (AV) nodal refractory period; ARP, atrial nodal refractory period.