Table 3.
ECG measurements in LQT2 patients with and without cardiac events
| No cardiac events (N=74) | Cardiac Events (N=69) | P value | |
|---|---|---|---|
| Gender(%female) | 39(53) | 17(25) | <.001 |
| RR(msec) | 961±150 | 993±148 | 0.123 |
| Scalar parameters (lead II) | |||
| QTc(msec) | 462±50 | 477±44 | 0.026 |
| QTac(msec) | 354±40 | 373±42 | 0.013 |
| TpTe(msec) | 106±38 | 103±31 | 0.626 |
| T amplitude(mV) | 0.19±0.09 | 0.18±0.11 | 0.184 |
| αL(μV/msec) | 1.8±1.2 | 1.6±1.0 | 0.133 |
| αR(μV/msec) | 2.5±1.5 | 2.3±1.7 | 0.206 |
| Vectorial parameters (lead ev1) | |||
| QTc(msec) | 460±42 | 474±49 | 0.023 |
| QTac(msec) | 345±35 | 365±46 | 0.004 |
| TpTe(msec) | 113±40 | 107±34 | 0.396 |
| T amplitude(mV) | 0.62±0.29 | 0.51±0.30 | 0.003 |
| αL(μV/msec) | 5.0±2.7 | 4.1±2.8 | 0.008 |
| αR(μV/msec) | 6.0±4.4 | 5.4±4.5 | 0.190 |
| ERD30%(msec) | 56±18 | 54±19 | 0.613 |
| ERD50%(msec) | 84±25 | 83±28 | 0.668 |
| LRD30%(msec) | 43±18 | 41±16 | 0.574 |
| LRD50%(msec) | 60±24 | 58±22 | 0.581 |
| T roundness(n.u.) | 0.387±0.182 | 0.474±0.190 | 0.006 |