ECG anomalies. Dr David Gray Consultant Physician and Cardiologist (recently retired) Cardiovascular Medicine University Hospital Nottingham

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1 ECG anomalies Dr David Gray Consultant Physician and Cardiologist (recently retired) Cardiovascular Medicine University Hospital Nottingham

2 What is the ECG? Just a delicate voltmeter Measures millivolts Clever bit filters out a lot of skeletal muscle interference

3 Normal ECG Bigger wave = more muscle Longer wave = longer duration

4 Cardiac conduction system

5 Normal ECG 1

6 Normal ECG

7 Normal ECG

8 Normal ECG

9 Normal ECG

10 Slow rhythms ECG anomalies in cardiology practice Fast rhythms Anxiety due to automatic interpretation package

11 Fast heart rates: a general rule narrow QRS complexes usually benign easily treated broad QRS complexes usually malignant complex to treat

12 ECG anomalies in cardiology practice Resting heart rate ~ 60-70bpm Heart block- Bradycardia- vascular disease atropine beta blockers calcium channel blockers digoxin cholinesterase inhibitors

13 ECG anomalies in cardiology practice: slow heart rates Resting heart rate below 60 bpm Heart block Drugs vascular disease beta blockers calcium channel blockers digoxin anti-arrhythmics cholinesterase inhibitors

14 Sinus bradycardia

15 Sinus bradycardia

16 Sinus bradycardia Tiredness Dizziness Collapse Breathlessness and consequences

17 Sick sinus syndrome

18 If it goes on for long enough, it can cause symptoms

19 If it goes on for long enough, it can cause symptoms Dizziness Collapse Breathlessness and consequences

20 Complete heart block

21 Complete heart block Dizziness Collapse Breathlessness and consequences

22 Left bundle branch block

23 Left bundle branch block Often asymptomatic Several causes But best to assume ischaemic heart disease

24 Sinus tachycardia

25 Sinus tachycardia

26 Sinus tachycardia Often asymptomatic Several causes Including anxiety

27 Bypass tract= extra wire

28 Bypass tract= extra wire

29 Bypass tract= extra wire Tendency to go very fast Dizziness Collapse Breathlessness and consequences

30 Narrow complex tachycardia

31 Narrow complex tachycardia

32 Narrow complex tachycardia Dizziness Collapse Breathlessness and consequences

33 Narrow complex tachycardia self-terminating

34 Atrial fibrillation

35 Atrial fibrillation

36 Atrial fibrillation Dizziness Collapse Breathlessness and consequences

37 Long QT syndrome

38 Long QT syndrome

39 Long QT syndrome Normal male = <430 msec Normal female = <460 msec >500 msec Risk of very fast heart rate Risk of sudden death

40 Brugada syndrome

41 Brugada syndrome

42 Brugada syndrome Risk of sudden death

43 Ventricular tachycardia Broad complex tachycardia

44 Ventricular tachycardia Broad complex tachycardia

45 Ventricular tachycardia Broad complex tachycardia Dizziness Collapse Breathlessness and consequences

46 Ventricular tachycardia Can be intermittent

47 Ventricular fibrillation

48 Ventricular fibrillation

49 Ventricular fibrillation Death unless rapid defibrillation

50 ST elevation

51 ST depression

52 ECG abnormalities in psychiatric practice

53 Psychiatric illness Does not protect from common health problems Cardiovascular disease Cerebrovascular disease Exposes individuals to increased risk of sudden death esp schizophrenia psychiatric medication

54 Risk factors at Rampton Hospital Blood pressure Cholesterol Diabetes mellitus Cigarette smoking Advancing age Obesity Lack of exercise Family history of premature heart disease Risk factors for vascular disease Blood pressure Cholesterol Diabetes mellitus Cigarette smoking Advancing age Obesity Lack of exercise Family history of premature heart disease

55 Psychiatric illness Does not protect from common problems Cardiovascular disease Cerebrovascular disease Exposes individuals to increased risk of sudden death esp schizophrenia psychiatric medication

56 Slow rhythms ECG anomalies in psychiatric practice Fast rhythms Anxiety due to automatic interpretation package

57 ECG anomalies and psychiatric practice: slow heart rates Resting heart rate below 60 bpm vascular disease beta blockers calcium channel blockers digoxin anti-arrhythmics cholinesterase inhibitors

58 ECG anomalies and psychiatric practice: fast heart rates Heart rate above 100 bpm anti-psychotic drugs Usually through QT prolongation

59 A few oddities

60 Reminder - Normal ECG

61 Sometimes drugs cause harm Reverse tick from digoxin toxicity

62 And some are downright dangerous Torsade de pointes: drug-induced RISK OF DEATH

63 AV pacing

64 Severe left ventricular hypertrophy

65 Hyperkalaemia Loss of P wave, wide QRS complex RISK OF DEATH

66 Hypokalaemia First degree heart block, ST depression, prominent U waves

67 Questions?

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