Table. 1 ECGs reportedly seen during prior clinical training

Arrhythmias

 Sinus arrhythmia

54 (80.6)

50 (90.9)

51 (94.4)

0.048

 Sinus arrest

13 (19.4)

19 (34.5)

49 (90.7)

< 0.001

 First degree AV block

31 (46.3)

30 (54.5)

53 (98.1)

< 0.001

 Mobitz type I second degree AV block (Wenckebach)

20 (29.9)

25 (45.5)

53 (98.1)

< 0.001

 Mobitz type II second degree AV block

21 (31.3)

20 (36.4)

52 (96.3)

< 0.001

 Third degree AV block

19 (28.4)

31 (56.4)

52 (96.3)

< 0.001

 Atrial fibrillation with normal rate

57 (85.1)

47 (85.5)

54 (100.0)

0.012

 Atrial fibrillation with uncontrolled rate

42 (62.7)

47 (85.5)

54 (100.0)

< 0.001

 Atrial flutter

34 (50.7)

22 (40.0)

52 (96.3)

< 0.001

 AV nodal re-entrant tachycardia

13 (19.4)

11 (20.0)

52 (96.3)

< 0.001

 Ventricular tachycardia

32 (47.8)

28 (50.9)

53 (98.1)

< 0.001

 Ventricular fibrillation

22 (32.8)

21 (38.2)

53 (98.1)

< 0.001

Waveform abnormalities

 Left anterior fascicular block

21 (31.3)

21 (38.2)

49 (90.7)

< 0.001

 Left bundle branch block

45 (67.2)

50 (90.9)

54 (100.0)

< 0.001

 Right bundle branch block

38 (56.7)

45 (81.8)

52 (96.3)

< 0.001

 Wolff-Parkinson-White pattern

10 (14.9)

12 (21.8)

49 (90.7)

< 0.001

 Left atrial enlargement

45 (67.2)

48 (87.3)

52 (96.3)

< 0.001

 Right atrial enlargement

43 (64.2)

49 (89.1)

52 (96.3)

< 0.001

 Left ventricular hypertrophy

63 (94.0)

55 (100.0)

54 (100.0)

0.036

 Right ventricular hypertrophy

47 (70.1)

49 (89.1)

53 (98.1)

< 0.001

 Anterior STEMI

56 (83.6)

54 (98.2)

54 (100.0)

< 0.001

 Inferior STEMI

58 (86.6)

52 (94.5)

53 (98.1)

0.043

 Pericarditis

38 (56.7)

30 (54.5)

53 (98.1)

< 0.001

 Hyperkalaemia

29 (43.3)

31 (56.4)

53 (98.1)

< 0.001

 Prolonged QT interval

20 (29.9)

25 (45.5)

53 (98.1)

< 0.001