Table 3 The frequency of ECG changes suggestive of hyperkalemia in mildly, moderately, and severely hyperkalemic patients
ECG changes suggestive of hyperkalemia | Hyperkalemia severity | Chi-square, p-value (X2, degree of freedom) | ||
|---|---|---|---|---|
Mild (5.5–5.9 mmol/L) (N=7) N (%) | Moderate (66.4 mmol/L) (N=27) N (%) | Severe (≥6.5 mmol/L) (N=33) N (%) | ||
Flattening of P wave | 1 (14.3) | 2 (7.4) | 4 (12.1) | 0.788 (0.476, 2) |
Disappearance of P wave | 0 (0.0) | 1 (3.7) | 1 (3.0) | 0.876 (0.264, 2) |
Prolonged PR interval (> 200ms) | 0 (0.0) | 3 (11.1) | 4 (12.1) | 0.733 (2.016, 2) |
Widened QRS (>120ms) | 1 (14.3) | 2 (7.4) | 5 (15.2) | 0.642 (0.888, 2) |
Peaked T wave | 1 (14.3) | 0 (0.0) | 7 (21.2) | 0.041 (6.396, 2) |
Shortened QT-corrected (QTc) interval | 0 (0.0) | 1 (3.7) | 0 (0.0) | 0.471 (1.504, 2) |
ST elevation | 0 (0.0) | 1 (3.7) | 0 (0.0) | 0.471 (1.504, 2) |
ST depression | 1 (14.3) | 1 (3.7) | 2 (6.1) | 0.756 (0.559, 2) |
Right bundle branch block (RBBB) | 1 (14.3) | 0 (0.0) | 2 (6.1) | 0.219 (3.033, 2) |
Left bundle branch block (LBBB) | 0 (0.0) | 0 (0.0) | 2 (6.1) | 0.346 (2.124, 2) |
Arrythmias | Â | Â | Â | 0.449 (7.846, 8) |
 Atrial fibrillation | 2 (28.6) | 2 (7.4) | 5 (15.2) | |
 Sinus bradycardia | 0 (0.0) | 5 (18.5) | 1 (3.0) | |
 Sinus tachycardia | 1 (14.3) | 3 (11.1) | 4 (12.1) | |
 Supraventricular tachycardia (SVT) | 0 (0.0) | 0 (0.0) | 1 (3.0) | |