ECG characteristics by result of ajmaline test
| Before mean (SD) | After mean (SD) | Difference mean (SD) | p Value | |
|---|---|---|---|---|
| (A) ECG parameters before and after the ajmaline challenge | ||||
| Heart rate (bpm) | 87 (16) | 95 (14) | 7 (2) | <0.001 |
| PR interval (ms) | 143 (24) | 196 (34) | 53 (5) | <0.001 |
| QRS (ms) | 85 (14) | 119 (18) | 34 (4) | <0.001 |
| QTc (ms) | 412 (21) | 461 (27) | 49 (6) | <0.001 |
| (B) In patients with positive test results | ||||
| Heart rate (bpm) | 83 (10) | 91 (10) | 8 (4) | 0.0015 |
| PR interval (ms) | 154 (25) | 212 (26)* | 58 (12) | <0.001 |
| QRS (ms) | 89 (15) | 125 (15) | 37 (7) | <0.001 |
| QTc (ms) | 411 (27) | 477 (34)* | 66 (18)* | <0.001 |
| (C) In patients with negative test results | ||||
| Heart rate (bpm) | 88 (17) | 95 (15) | 7 (3) | <0.001 |
| PR interval (ms) | 141 (23) | 192 (35)* | 52 (6) | <0.001 |
| QRS (ms) | 84 (14) | 117 (19) | 33 (4) | <0.001 |
| QTc (ms) | 412 (24) | 457 (24)* | 46 (5)* | <0.001 |
*p<0.05 (B vs C).