Variables | Abnormal stress echocardiogram (n = 51) | Normal stress echocardiogram CAD (n = 51) | p-values |
---|---|---|---|
Stress EKG | |||
Maximum heart rate achieved (bpm) – mean (SD) | 141.9 (16.3) | 148.5 (16.1) | 0.04 |
Percentage of maximum predicted heart rate (%) – median (IQR) | 92.0 (88.0 – 99.0) | 94.0 (90.0 – 101.0) | 0.08 |
Maximum systolic blood pressure (mmHg) – mean (SD) | 169.4 (27.2) | 174.4 (27.4) | 0.36 |
Abnormal blood pressure responsea – no. (%) | 7 (13.7) | 3 (5.9) | 0.18 |
Positive EKG for ischemia during the stress test – no. (%) | 35 (68.6) | 27 (52.9) | 0.11 |
Clinically positive stress testb – no. (%) | 22 (43.1) | 3 (5.9) | < 0.0001 |
Maximum achieved METS – median (IQR) | 7.3 (6.1 – 9.6) | 10.0 (7.7 – 11.7) | < 0.0001 |
Double product – mean (SD) | 23,884.7 (4876.6) | 26,179.9 (4705.6) | 0.02 |
Stress echocardiography | |||
Absence of left ventricular ejection fraction increase at peak stress – no. (%) | 31 (60.8) | 0 (0.0) | < 0.0001 |
Wall motion score index at peak stress – median (IQR) | 1.4 (1.2 – 1.5) | 1.0 (1.0 – 1.0) | < 0.0001 |
Predicted significant CAD in the LAD territory – no. (%) | 33 (64.7) | 0 (0.0) | < 0.0001 |
Predicted significant CAD in the non-LAD territory – no. (%) | 25 (49.0) | 0 (0.0) | < 0.0001 |