ECG! - created from Mind Map

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P wave- atrial depolarisation

PR interval - (0.12-0.20s, 3-5 squares)

QRS complex- Ventricular depolarisation

ST segment - pause in ventricular activity

T wave- ventricular repolarisation

Heart Block (PR interval >0.20s)

1st degree: PR delay is constant, and all P waves followed by QRS complex

2nd degree

3rd degree: Atrial P waves have no relation to QRS complex (P waves abnormal/absent, bradycardia, broad QRS)

Mobitz type 1: PR progressively longer till one P wave not conducted and no QRS, then reset

Mobitz Type 2: PR interval fixed and normal, occasional P wave no QRS

2:1 block - every alternate P wave no QRS

Atrial flutter: Atrial rate 300/min, ventricular rate 150, sawtooth baseline, AV block (2:1, 3:1, 4:1)

AF: irregularly irregular rhythm, no P waves, QRS rate 170/min

Ventricular tachy: Broad QRS, ventricular rate >120, may degenerate into VF

Re-entrant tachy: Verticular rate 188, narrow RS complex, P waves halfway between QRS complexes

VF: chaotic rhythm, broad QRS , rate >190

ECG!