EKG Recognition: When to Worry
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1 EKG Recognition: When to Worry Roslinde M. Collins, MD, D,ABSM, FCCP, FAASM Medical Director, Center for Sleep Disorders at Rutland Regional Medical Center in Vermont NEPS Conference September 14, 2012
2 Goals of this lecture To gain basic understanding of the electricity of the heart To review patterns of arrhythmias To know when a rhythm is life threatening or potentially life threatening Review special cases such as artificial pacemakers and AICDs
3 Case #1: Spike Jonze
4 Lessons Learned from Case #1: Keep an eye on your monitors It is helpful to hear your alarms No singing and dancing and fooling around in the trauma (control) room Don t shock asystole
5 AASM Cardiac Scoring Rules Score sinus tachycardia during sleep for a sustained sinus heart rate of greater than 90 beats per minute (bpm) for adults Score wide complex tachycardia for a rhythm lasting a minimum of 3 consecutive beats at a rate of greater than 100 bpm with QRS duration of greater than or equal to 120 msec Score narrow complex tachycardia for a rhythm lasting a minimum of 3 consecutive beats at a rate of greater than 100 bpm with QRS duration of less than 120 msec
6 AASM Cardiac Scoring Rules (cont.) Score bradycardia during sleep for a sustained heart rate of less than 40/minute for ages 6 years through adult Score asystole for cardiac pauses greater than 3 seconds for ages 6 years through adult Score atrial fibrillation if there is an irregularly irregular ventricular rhythm associated with replacement of consistent P waves by rapid oscillations that vary in size, shape, and timing
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8 EKG Basics
9 EKG= Electrocardiogram= ECG
10 ECG Intervals and Waves-KH Frank G. Yanowitz, M.D., copyright 1997 The EKG complex
11 Cardiac Conduction System Diagram - Marquette-KH Marquette Electronics Copyright 1996
12 Depolarization = muscle contraction = Systole Repolarization = muscle relaxation = Diasystole
13 12 lead EKG Rate Rhythm Axis Ischemia, hypertrophy, etc. Frontal and Horizontal Plane Lead Diagram-KH Frank G. Yanowitz, M.D.
14 Rate Rhythm? Holter monitor (3 channels) Channel/lead Rhythm Strip
15 (a) 25 seconds snap shot from sleep study in patient number 2 during wakefulness. White arrows show the beats that were initially reported as non-conducted P-waves. Upper channels (C3-A1) (01-A1): electroencephalogram; third and fourth channel (L-EOG-A1) (R-EOG- A1): oculogram; fifth channel (EMG1) (EMG2): electromyogram; sixth channel (EKG1) (EKG2): electrocardiogram; seventh channel (SaO2): oxygen saturation; eighth channel (LEG1) (LEG2): leg movement; ninth channel: airflow; tenth channel: chest movement; eleventh channel: abdomen movement. (Panel (b)) Amplification of the area under the highlighted rectangle in panel (a). White arrows show the PVCs followed by a post-extrasystolic pause. (Panel (c)) 12-lead ECG shows right bundle branch block. White arrows show PVCs arising probably from the left outflow tract. Truths and Lies from the Polysomnography ECG Recording: An Electrophysiologist Perspective Case Report Med May 4; 2009:675078
16 Communication of an abnormal EKG There is a (wide or narrow) complex (regular or irregular) rhythm with a heart rate of. There is a beat run of (wide or narrow) complex (regular or irregular) rhythm with a heart rate of. There is/are second pause(s).
17 EKG Interpretation Here s what you need to determine/describe Heart rate Morphology of QRS complex (narrow v. wide) Rhythm: regular or irregular Identify Premature beats Tachycardia Bradycardia Pause/arrest/asystole Atrial fibrillation
18 EKG Interpretation 1. Heart rate 2. Morphology of QRS complex (narrow v. wide) 3. Rhythm: regular or irregular
19 First: Determine Heart Rate (Beats Per Minute) Do you believe your PSG software? (it counts QRS complexes) Do you believe your pulse oximeter? (it uses plethysmography)
20 Determine Heart Rate (Beats Per Minute: there are 60 seconds in a minute!) Count the QRS complexes in your EKG: # QRS complexes in 60 seconds = BPM # QRS complexes in 30 seconds X2 = BPM # QRS complexes in 20 seconds X3 = BPM # QRS complexes in 15 seconds X4 = BPM # QRS complexes in 10 seconds X6 = BPM # QRS complexes in 6 seconds X10 = BPM # QRS complexes in 5 seconds X12 = BPM # QRS complexes in 4 seconds X15 = BPM # QRS complexes in 3 seconds X20 = BPM # QRS complexes in 2 seconds X30 = BPM # QRS complexes in 1 seconds X60 = BPM
21 Determine Heart Rate: Eyeballing It One second One compex per second = 60 BPM (1X60) More than one complex per second is >60 BPM Less than one complex per second is <60 BPM
22 Practice heart rate (5 seconds) (one second) Heart rate of the whole strip: 6 complexes x 12 = 72 Heart rate of the triplet: 3 complexes x 60 = 180
23 EKG Interpretation 1. Heart rate 2. Morphology of QRS complex (narrow v. wide) 3. Rhythm: regular or irregular
24 QRS Morphology Narrow = Normal Wide = Abnormal
25 Narrow (QRS) Complex vs. Wide (QRS) Complex Narrow complex QRS interval is < 0.12 sec Originating from above or at the AV node Wide complex QRS interval is > 0.12 sec Intraventricular conduction delay
26 Wide QRS Complexes Are Abnormal Represent Abnormal conduction through the ventricles LBBB, RBBB, fascicular blocks Intraventricular conduction delay Primary (pacemaker) of ventricular origin Premature Ventricular Contraction (PVC) Idioventricular rhythm Ventricular tachycardia (VT) Ventricular fibrillation (VF) Artificial pacemaker (ventricular)
27 Example of wide complex QRS
28 How can I tell? Narrow Complex EEG spike Wide Complex EEG K complex
29 EKG Interpretation 1. Heart rate 2. Morphology of QRS complex (narrow v. wide) 3. Rhythm: regular or irregular
30 Regular rhythm: R-R interval is constant (measure distance or time)
31 Irregular rhythm (includes premature beats)
32 Regular v. Irregular Rhythm
33 Sinus Rhythm or Not? Look for the P waves! Regular v. Irregular Rhythm
34 Identify Premature beats Tachycardia Bradycardia Pause/arrest/asystole Atrial fibrillation
35 Premature Beats: occur earlier than your next predicted QRS complex Premature Atrial Contractions (PACs) Narrow (usually) Look like EEG spikes Premature Ventricular Contractions (PVCs) Wide complex Look like K complexes
36 Premature Atrial Contractions (PACs)
37 Premature Ventricular Contractions (PVCs)
38 PVC patterns are important to recognize: abnormal PVC rhythms increase the risk of having deadly ventricular rhythms such as Venticular Tachycardia (VT) and Ventricular Fibrillation (VF)
39 Bigeminy (every other beat is a PVC) Trigeminy (every third beat is a PVC)
40 Couplet More than 3 PVCs = Ventricular tachycardia (VT)
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46 Identify Premature beats Tachycardia (heart rate greater than 100) Bradycardia Pause/arrest/asystole Atrial fibrillation
47 Wide complex tachycardias are VERY BAD
48 Sustained Ventricular Tachycardia (VT)
49 Non-Sustained Ventricular Tachycardia (NSVT) 6 second strip 3 seconds Heart rate of whole strip: 120 (12 x 10) Heart rate of burst of NSVT: 160 (8 x 20)
50 Ventricular Fibrillation (VF or Vfib) (often looks like sawtooth waves!)
51 VF: Torsades de Pointe (think of CSR)
52 Holter monitor recording showing ventricular tachycardia degenerating to ventricular fibrillation. HR, heart rate. Cleveland Clinic
53 Ventricular Tachycardia (VT) and Ventricular Fibrillation (VF)
54 Vfib Shocked
55 AICD: Automatic Implantable Cardioverter Defibrillator Indicated in patients with previous VT, VF, sudden cardiac death or increased risk of ventricular arrhythmias Often has pacemaker ability Safe for health care providers to perform CPR, etc. Send the patient to the ED if the device discharges
56 Narrow Complex Tachycardia
57 Sinus Tachycardia v. SVT (Supraventricular Tachycardia) (10 second strip) Heart rate is 25 x 6 = 150
58 Burst of SVT: often seen in association with arousals following respiratory events 10 second strip 3 seconds Heart rate of whole strip: 78 (13 x 6) Heart rate of SVT: 200 (10 x 20)
59
60 Identify Premature beats Tachycardia Bradycardia (heart rate less than 60) Pause/arrest/asystole Atrial fibrillation
61 Bradycardia: wide or narrow? P waves or not? (6 second strip) 4 QRS complexes X 10 = 40 BPM
62 Identify Premature beats Tachycardia Bradycardia Pause/arrest/asystole Atrial fibrillation
63 One Second Pause
64 PAUSE/ARREST/ASYSTOLE (3.5 seconds) Greater than 3 second pause is considered asystole
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66 Sick Sinus Syndrome Narrow complex irregular rhythm with frequent long pauses and escape beats.
67 Artificial Pacemakers
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69 Atrial Pacemaker: spike instead of P wave
70 Electronic Ventricular Pacemaker Rhythm - Marquette-KH Marquette Electronics Copyright 1996
71 AV Sequential Pacemaker - Marquette-KH Marquette Electronics Copyright 1996
72 Identify Premature beats Tachycardia Bradycardia Pause/arrest/asystole Atrial fibrillation
73 Atrial Fibrillation (Afib) Atrial Fibrillation With Moderate Ventricular Response - Marquette-KH Marquette Electronics Copyright 1996
74 Atrial Fibrillation with Rapid Ventricular Response (RVR) is a type of Supraventricular Tachycardia (SVT)
75 Abnormal EKG? Make sure that it s real! Artifact can look like arrhythmias and even asystole Lead on the patient? Look in another channel/lead Asystole artifact: look for your pleth wave tracing or be happy that you have EKG artifact in your EEG
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81 When to Worry: The Threatening Threes Heart rate in the triple digits (> 100) Tachycardia of more than 3 beats in a row Heart rate in the 30s (or less!) Pause of greater than 3 seconds More than 6 PVCs per minute (or more than 3 PVCs per 30 second epoch) (Irregularly irregular heart rhythm)
82 What do I do now? Confirm that the arrhythmia is real Check on the patient (ABCs) Call a code (or 911) if unstable If stable and unsymptomatic, call physician coverage if unsure about severity or transfer to ED Know your emergency policies and procedures Document well and sign out your findings
83 Communication of an abnormal EKG There is a (wide or narrow) complex (regular or irregular) rhythm with a heart rate of. There is a beat run of (wide or narrow) complex (regular or irregular) rhythm with a heart rate of. There is/are second pause(s).
84 (Free!) References The Alan E. Lindsay ECG Learning Center in Cyberspace ECGPedia LearnTheHeart.com
85 (6 seconds) Narrow or wide complex? Regular or irregular? Heart rate? What is it? Narrow Irregular 80 NSR with pauses
86 (6 seconds) Narrow or wide complex? Regular or irregular? Heart rate? What is it? Wide complex Regular 140 VT until proven otherwise
87 (6 seconds) Narrow or wide complex? Regular or irregular? Heart rate? What is it? Narrow Irregular 50 Atrial fibrillation (Afib)
88 (6 second strip) Narrow or wide complex? Regular or irregular? Heart rate? What is it? Wide Regular 50 Wide complex bradycardia without P waves (likely idioventricular)
89 (6 second strip) Narrow or wide complex? Regular or irregular? Heart rate? What is it? Narrow Irregular 110 Sinus tachycardia with two unifocal PVCs
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