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Table 1 Comparison of ECG parameters before and after propanolol

From: Effect of propranolol on heart rate variability in hyperthyroidism

Variables Before After p (Wilcoxon)
HR 91 ± 18 79 ± 9 0.02
R–R 668.8 ± 126.8 762.4 ± 77.3 0.01
QT 360.9 ± 29.2 384.3 ± 15.9 0.01
Corrected QT 447 ± 10.9 440.8 ± 21.5 0.86
P–R 133.9 ± 54.7 172.7 ± 43.63 0.01
QRS 93 ± 6.1 97 ± 10.2 0.01
Mean RR (s) 0.71 ± 0.08 0.79 ± 0.06 0.02
Mean HR (min−1) 85.5 ± 9.3 76.1 ± 5.1 0.02