ECGs: Everything a finalist needs to know. Dr Amy Coulden As part of the Simply Finals series
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1 ECGs: Everything a finalist needs to know Dr Amy Coulden As part of the Simply Finals series
2 Aims and objectives To be able to interpret basic ECG abnormalities To be able to recognise commonly tested ECGs in exams To be able to present an ECG as part of OSCE scenario To be able to set up an ECG as part of OSCE scenario
3 The ECG Atrial depolarisation Ventricular depolarisation Ventricular repolarisation SA node (right atrium) -> AV node -> Interventricular septum (bundle of His) -> Left and right bundle branches
4 Setting up the ECG- Chest leads V1- Right sternal border- 4 th IC space V2- Left sternal border, 4 th IC space V3- Half way between V2 and V4 V4- Left mid clavicular line, 5 th IC space V5- Half way between V4 and V6 V6- Left mid axillary line, horizontal to V4
5 Setting up the ECG- limb leads Don t forget to calibrate the machine 10mm/mV & 25mm/s Right arm- Red Left arm- YeLLow Right foot- Black Left foot- Green
6 Presenting an ECG 1. What? When? Who? Where? Why? An electrocardiogram dated 15 th January 2018 at 10:30 of Joe Bloggs, 52 years old performed in A&E with a presenting complaint of chest pain 2. Main abnormality (if apparent) 3. Structured approach - Rate - Rhythm - Axis - P waves/ PR interval - QRS complex - ST segment - T waves/ QT interval 4. Summary 5. Further investigation and management
7 Rate Rate= 300/ R-R interval 1 per every large square= 300 bpm 2 = 150 bpm 3 = 100 bpm 4 = 75 bpm 5 = 60 bpm 6 = 50 bpm HR >100- tachycardia HR < 60- bradycardia
8 Around bpm What s the rate?
9 35 bpm What s the rate?
10 What s the rate? R waves x 6 ( bottom strip- II) = rate per minute Around 65bpm Around 150bpm Therefore rate = 17 x 6 = 102 bpm
11 Rhythm 2 questions - Regular or irregular? - If irregular - Regularly, irregular? i.e follows a pattern - Irregularly irregular? AF!
12 Rhythm Diagnosis? Sinus arrhythmia Irregular, P wave before every QRS, Regular PR interval, rate Regular R-R interval, no P waves, rate around 200bpm, narrow complex Diagnosis? Supraventricular tachycardia Diagnosis? Fast atrial fibrillation Irregularly irregular, no P waves, tachycardia Regularly irregular, PR not increasing, regular dropped QRS Diagnosis? 2 nd Degree heart block, type II
13 Axis Left axis deviation Right axis deviation Normal axis
14 Axis deviation Look at leads I and avf (or III) Are they Leaving? (i.e. I is positive and avf (or III) is negative) Are they Reaching? (i.e I is negative and avf (or III) is positive) Look at lead II Look at lead II Is it negative? Is it positive or isoelectric? Is it negative? Is it positive or isoelec Left Axis Deviation Physiological LAD Right Axis Deviation
15 What s the axis? Normal axis
16 P waves P wave = Atrial depolarisation <3 small squares (120ms)
17 P waves P Mitrale- Left atrial enlargement P Pulmonale- Right atrial enlargement No P waves? Disorder/ absence of atrial contraction
18 What s the diagnosis Atrial flutter with 4:1 block
19 What s the diagnosis? Atrial fibrillation
20 PR interval Start of P to start of QRS complex <5 small squares (200ms)
21 AV nodal block PR interval >5 squares PR interval constant No dropped QRS 1 st degree heart block 2 nd degree heart block, type I (Wenckebach) PR interval >5 squares Increasing PR interval Followed by dropped ORS PR interval >5 squares Fixed PR interval Regular dropped QRS complexes 2 nd degree heart block, type II Complete heart block Complete dissociation between P waves and QRS complexes Widened QRS
22 QRS complex Ventricular depolarisation < 3 small squares (120ms)
23 Bundle branch block W i L L i a M Broad complex QRS (> 120ms) M a R R o W
24 LBBB or RBBB? RBBB
25 LBBB or RBBB? LBBB New onset LBBB can be a sign of acute ischaemia It is not possible to intepret the ST segment in LBBB
26 ST segment The period when the ventricles are polarised
27 Can you think of causes of ST Ischaemia Pericarditis Hyperkalaemia elevation? Ventricular aneurysm Brugada syndrome Normal variant (high take off) To name a few
28 ST elevation MI
29 Cardiac territories- MI SEPTAL Note: Posterior MI ST depression in anterior leads (V1-V2) - RCA or Left Cx
30 What s the diagnosis? What vessel is involved? Anterolateral MI with reciprocal depression LAD + Left Cx
31 Evolving ECG pre and post MI ST elevation T wave inversion Q wave
32 T wave Ventricular repolarisation
33 Tall tented T waves (Note- could also have prolonged PR and widened QRS) Diagnosis? Hyperkalaemia U have no Pot and no T, but a long PR and a long QT Inverted/ flattened T waves, U waves, long PR and long QT Diagnosis? Hypokalaemia Hyperacute, wide based T waves (also ST elevation) Diagnosis? Acute MI
34 Long QT Prolonged: > 450ms males, > 470ms females (Use QTc on print out) Can you name a few causes? Congenital CNS causes- stroke, intracerebral bleed Electrolyte disturbances (hypokalaemia, hypomagnesemia, hypocalcaemia) Drugs e.g. antipsychotics
35 Now let s practice Present this ECG to your neighbour
36 27 M BG: known antiphospholipid syndrome PC: pleuritic chest pain. Diagnosis? PE S1 Q3 T3 Other ECG findings consistent with PE? Sinus tachycardia, RBBB, RAD
37 72 F BG: IHD PC: Collapse Diagnosis? Trifascicular block RBBB LAD AV Block
38 25 F PMH: Nil PC: Palpitations Diagnosis? Supraventricular tachycardia Narrow complex QRS Tachycardia- rate 150 bpm No P waves
39 As opposed to Broad complex QRS Tachycardia No P waves Diagnosis? Ventricular tachycardia
40 32 M BG: Anxiety PC: Chest pain Diagnosis: Normal ECG
41 78M BG: IHD PC: OOH arrest Diagnosis? Ventricular fibrillation Fibrillating wide complexes Tachycardia
42 28 M BG: FHx of young cardiac arrest PC: Collapse Diagnosis? Brugada syndrome
43 Wide based QRS on it s own: ventricular ectopic Torsades de points: Polymorphic VT Sick sinus syndrome: Brady, tachy and tachybradycardias High take off: normal variant
44 Wolf Parkinson White (AVRT): Short PR, Wide QRS, delta wave Digoxin toxicity: reverse tick AVNRT (junctional tachycardia): Narrow complex QRS, no P waves, regular Pericarditis: Widespread ST elevation, PR depression
45 Any questions? THE END
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