Table 1.
Echocardiographic characteristics before and after rapid pacing
| Pre | Post | P-value | |
|---|---|---|---|
| LVIDD (cm) | 1.64 ± 0.14 | 1.70 ± 0.27 | n.s. |
| LVIDS (cm) | 1.00 ± 0.17 | 1.45 ± 0.20 | P < 0.01 |
| FS (%) | 40 ± 6 | 17 ± 7 | P < 0.001 |
| EDV (cm3) | 4.02 ± 1.02 | 4.55 ± 1.25 | n.s. |
| ESV (cm3) | 1.06 ± 0.50 | 2.86 ± 1.25 | P < 0.02 |
| EF (%) | 75 ± 9 | 30 ± 11 | P < 0.001 |
| SV (cm3) | 2.96 ± 0.67 | 1.87 ± 1.0 | P < 0.037 |
| HR (bpm) | 252 ± 10 | 400 ± 0 | P < 0.001 |
LVIDD, left ventricular internal dimension at diastole; LVIDS, left ventricular internal dimension at systole; FS, fractional shortening; EDV, end-diastolic volume; ESV, end-systolic volume; EF, ejection fraction; SV, stroke volume; HR = heart rate; bpm = beats per minute