SIMPLY ECGs. Dr William Dooley
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1 SIMPLY ECGs Dr William Dooley 1
2 No anatomy just interpretation 2
3 Setting up an ECG 3
4 Setting up an ECG 1 V1-4 th Right intercostal space at sternal border 2 V2-4 th Left intercostal space at sternal border 3 V4-5 th Left intercostal space in mid-clavicular line 4 V3- Halfway between V2 and V4 5 V6- Mid-axillary line at same horizontal plane as V4 6 V5- Placed between V4 and V6 4
5 Basic Interpretation and Presentation 1. What/When: Electrocardiogram on Date and Time 2. Who/Why: Patient name with Age / Presenting Complaint 3. +/- Main abnormality 4. Structured approach: Rate Rhythm Axis P Waves/PR Interval QRS Complex ST segment T Waves/QT Interval 5. Summary, then Investigation Management 5
6 Rate / R to R Interval (Big squares) 1 = 300 bpm 2 = 150 bpm 3 = 100 bpm 4 = 75 bpm 5 = 60 bpm 6 = 50 bpm Normal rate is bpm Bradycardia: Rate is <60 bpm Tachycardia: Rate is >99 bpm What is the rate? 80bpm 6
7 Regular/Irreguar? What is the rate? 7
8 Quickest Rate Slowest Rate 225 bpm 100 bpm Regular/Irreguar? What is the rate? 8
9 Count up all the QRS complexes x 6 (on standard ECG Paper) A standard ECG strip records 10 seconds So this will give the rate over 1 minute Count QRS = x 6 = 144 bpm 9
10 Step 2: Rhythm Regular/Irregular? What is the rhythm? Sinus arrythmia faster in inspiration /slower in expiration 10
11 Step 2: Rhythm Normal Sinus Rhythm P wave is followed by QRS P-R interval is ms P-R interval is constant Rate between 60-99bpm P wave is followed by QRS P-R interval is ms P-R interval is constant Rate 100bpm or more Sinus tachycardia Atrial Fibrillation No P waves Irregularly irregular Variable R-R intervals Narrow complex tachy Regular P waves (300bpm) Flutter waves (most in II/III/aVF) Atrial Flutter Regular/Irregular? What is the rhythm? 11
12 Step 3: Axis Leads I and avf Normal Leaving Returning Left axis deviation If Lead 2 negative or isoelectric Right axis deviation Normal -30 to
13 Step 4: P Waves and PR Interval P wave: Atrial Depolarization. < 3 small squares in duration (120 ms) PR Interval = Start of P to start of QRS < 5 squares (200 ms) Lead II best 13
14 What degree of heart block are these? Progressive lengthening of PR interval, then dropped QRS complex 2nd Degree (Mobitz Type 1) AKA: Wenckebach 1st Degree PR Interval fixed and >5 small squares (200ms) 3rd Degree / Complete No relationship between P waves and QRS complexes 14
15 Heart Block 2nd Degree (Mobitz 2) PR Interval is constant QRS complex dropped Need longer rhythm strip to see if there is a fixed order block e.g. 3:1 block Need pacing 15
16 Step 5: QRS Complex Ventricular Depolarization <3 small squares (120ms) 16
17 Which type of bundle branch block are these? Causes IHD Hypertensive Heart Disease Dilated Cardiomyopathy Idiopathic Fibrosis of the Conducting System 17
18 vs. 18
19 RBBB. Broad QRS Complex V1/V2 V5/V6 Normal axis deviation MaRRoW Picture of marrow 3 Bundles of His 1 on Right, 2 on Left Causes Normal Rheumatic heart disease Cor pulmonale/right ventricular hypertrophy Myocarditis or cardiomyopathy IHD Degenerative disease of the conduction system Pulmonary embolus Congenital heart disease: ASD 19
20 LBBB Broad QRS Complex V1/V2 V5/V6 WiLLiaM Normally Left axis deviation Nb. Not possible to interpret ST segment in LBBB Causes IHD Hypertensive Heart Disease Dilated Cardiomyopathy Idiopathic Fibrosis of the Conducting System 20
21 Step 6: ST Segments From end of QRS to end of T Wave Normally isoelectric 21
22 75 yo. Central crushing chest pain & SOB. PMH- HTN/CCF DH- Frusemide/amlodipine SH- Smoker What is the main abnormality? How would you present this case? History Examination Investigation Management Rate 75 NSR Mild LAD QRS n STE- I avl YES II/III/aVF- NO Chest leads- YES Anterio-lateral MI 22
23 12 lead ECG Panoramic view of heart from 12 angles Limb/augmented leads frontal plane 6 chest leads horizontal plane 23
24 I and AVL V3 & v4 V1 & v2 II, III and AVF V5 & v6 24
25 25
26 Cardiac Territories Inferior Right Coronary Artery Lateral Left Circumflex Artery Anterior Left Anterior Descending Artery Posterior (ST Depression) RCA/LCX ST segment elevation of greater than 1mm in at least 2 contiguous leads Heightened or peaked T waves 26
27 What territory? What vessel? Inferior / posterior Right Coronary Artery Left Circumflex Artery Inferior Posterior RCA RCA/LCX 27
28 Evolving MI and Hallmarks of AMI 1 year Depth of Q wave should be 25% the height of the R wave Width of Q wave is 0.04 secs Diminished height of the R wave 28
29 T Waves Ventricular Repolarization Normal = same direction as QRS complex 29
30 What s the T wave abnormality? 81 yo, male with palpitations. PMH- HTN & CCF DHx- Enalapril/Spironolactone Rate- 75 Rhythm- NSR Axis N QRS N T- tall tented Hyperkalaemia 30
31 Tall tented narrow T waves Hyperkalaemia Wide based, asymmetrical T waves Hyperacute ischaemia 31
32 39yo female. SOB. PMH- Nil DHx- COCP What are the abnormalities on this ECG? What is the diagnosis? How would you present it? Rate- 75 NSR RAD P- waves present PR- Normal QRS- Q waves in I RBBB Dx PE- Rare findings on ECG - this is classical S1 Q3 T3. Normally just sinus tachycardia 32
33 ECG changes in pulmonary embolism Classical S1Q3T3 Occurs in only 20% of PE. S1 Deep S wave in lead 1 Q3 T3 Q wave in lead 3 Inverted T wave in lead 3 More common is sinus tachycardia, RBBB or RAD 33
34 72 yo woman in ED. Syncopal episode. PMH- CCF Present this ECG. History Examination Investigation Management Rate 5=60 Rhythm- N first degree heart block, left axis deviation and RBBB Trifasicular block 34
35 Bifasicular block 1. Right bundle branch block, and: 2. either left anterior fasciular block Left axis deviation or left posterior fasciular block Right axis deviation Trifasicular block 1. Bifasicular block, and 2. Heart block (most commonly 1 st degree) 35
36 Ventricular Fibrillation 36
37 Ventricular Tachycardia 37
38 Asystole 38
39 Basic ECG Interpretation Rate Rhythm Axis P Waves/PR Interval QRS Complex ST segment T Waves/QT Interval Summary 39
40 Basic ECG interpretation pattern Some common (examined) abnormalities Presenting ECGs in context Any Questions? 40
41 78yo in ED. Collapsed PMH- CCF DH?? Rate: 300/8-37 Rhythm Regular Axis RAD PR- 2:1 p waves : QRS QRS RBBB Mobitz type 2 AV block History Examination Investigation Management 41
42 'High Take Off Normal variant in correct context 42
43 R wave progression V1 negative V6 positive 43
44 Ectopics Supraventricular Narrow Complex Abnormal P Wave Normally get compensatory pause Ventricular Abnormal Broad Complex Then goes back to normal beat 44
45 Atrial Tachycardias Appearance Narrow Complex Abnormal P wave morphology Supraventricular = Narrow Complex Sinus Tachycardia Atrial Tachycardia Atrial Flutter Atrial Fibrillation Junctional Tachycardias inc. Wolff Parkinson White Ventricular = Broad Complex Ventricular Tachycardia Ventricular Fibrillation Causes Cardiomyopathy COPD IHD Rheumatic heart disease Sick sinus syndrome Digoxin toxicity 45
46 Atrial Flutter Atria contractions of 300bpm Saw-tooth flutter waves Normally also see AV block Result of abberant internal circuit within atria 46
47 Atrial Fibrillation Uncoordinated atrial depolarization No P waves + Irregular baseline Causes IHD Hypertensive heart disease Rheumatic heart disease Thyrotoxicosis Alcohol misuse Cardiomyopathy Sick sinus syndrome Postcardiac surgery Chronic pulmonary disease Idiopathic (lone) 47
48 Ventricular Tachycardia Aberrant focus of excitation in ventricles Wide QRS Complex Monomorphic or polymorphic 48
49 Ventricular Tachy Capture Beats Atrial depolarization capture Fusion Beat Mix of A & V beats Looks halfway between normal and VT Torsades Type of polymorphic VT Fluctuates 49
50 Junctional Tachycardias AVN Re-entry Tachycardia 2 pathways through AVN & common final pathway One fast - long refractory period One slow- short refractory period Atrial beat Down slow as fast refractory Back up fast pathway Circuit gets set-up Narrow QRS/Regular/No P Waves Terminates with Adenosine 50
51 Atrioventricular Re-entry Tachycardia: WPW Aberrant connection between Atria and Ventricle with non-specialist conduction tissue Rapid conduction into ventricles Short PR / Long upstroke to QRS: Delta Wave Extra circuit -> re-entry tachycardia 2 types 1: Dominant R in V1 2: No dominant R in V1 51
52 Sick Sinus Syndrome Get Brady, Tachy and Tachy-bradycardias Age Idiopathic fibrosis Ischaemia, including myocardial infarction High vagal tone Myocarditis Digoxin toxicity 52
53 21yo Somalian male. Syncopal episode. Now asymptomatic PMH- Nil. Has had similar episodes previously Rate 100 Sinus Axis mild left Rest normal ST- coved st segment with TWI Brugada syndrome 53
54 Coved ST segment elevation >2mm in >1 of V1-V3 followed by a inverted T wave Brugada syndrome Signs and symptoms include: - Blackout - Seizures - Cardiac arrest 54
55 ECG RBBB R wave progression rather than Marrow Do W and M then give a lots R postive L ventr hyp 55
SIMPLY ECGs. Dr William Dooley
SIMPLY ECGs Dr William Dooley Content Basic ECG interpretation pattern Some common (examined) abnormalities Presenting ECGs in context Setting up an ECG Setting up an ECG 1 V1-4 th Right intercostal space
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