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Table 3 The frequency of ECG changes suggestive of hyperkalemia in mildly, moderately, and severely hyperkalemic patients

From: Clinical and electrocardiogram presentations of patients with high serum potassium concentrations within emergency settings: a prospective study

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     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)