Case reports from Michael Rosengarten: Difference between revisions

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===Cardiac Pacemakers:===
==Cardiac Pacemakers:==
A review of cardiac pacing  
A review of cardiac pacing  
Modes of cardiac pacing  
Modes of cardiac pacing  

Revision as of 06:48, 15 February 2012

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This case report is kindly provided by Michael Rosengarten from McGill and is part of the McGill Cases. These cases come from the McGill EKG World Encyclopedia.


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Conduction Abnormalities

Intraventricular conduction defect

Right Bundle Branch Block

Left Bundle Branch Block

Left Anterior Fasicular Block

Left Posterior Fasicular Block

Bifasicular block

Right bundle branch block with left anterior hemi-block

Right bundle branch block with left posterior hemi-block

Alternating Bundle Branch Block

Trifasicular block

A/V Blocks

First degree block:

Second degree block

Mobitz I

Mobitz II

Complete heart block

Sinus Node Block:


Cardiac Pacemakers:

A review of cardiac pacing Modes of cardiac pacing Definitions of different pacing modes

Examples of different pacing modes

DDD pacemakers

DDD timing diagram in sinus rhythm with an AV delay of 80ms. DDD mode showing atrial and ventricular pacing and atrial sensing and venticular pacing. DDD mode showing ventricular tracking of atrial fibrillation DDI timing diagram in sinus rhythm and with one PVC with an AV delay of 80ms. DDI pacing at a lower rate of 50/min DDD pacemaker recorded on a 12 lead EKG. Patient has a severe intraventricular conduction abnormality DDD pacemaker at its upper rate limit in a patient with atrial fibrillation/flutter DDD pacemaker failing to sense a P wave DDD pacemaker the effect of a PVC on the timing cycles DDD pacemaker timing diagram with atrial lead pacing the ventricle A patient with atrial tachycardia with an intra-atrial recording from his pacemaker Ladder diagrams and tracings while in DDI mode and complete heart block. DDD pacer set at 70/min. but atrial pacing at 75/min due to conduction with a PR interval shorter than the A/V interval set on the pacemaker. Recording from the atrial lead of a patient with atrial fibrillation

Atrial pacing

AAI with ladder diagram AAI pacing 12 lead with a patient with Right Ventricular dysplasia taking Flecainide for ventricular tachycardia. A series of electrocardiograms from a 78 year old woman who was implanted with a VVI pacemaker in 1991. The patient developed congestive heart failure five years later due to pacemaker syndrome which was corrected by switching to atrial pacing. A patient with an atrial pacer that did not seem to pace properly. Two rhythm strips from a patient with an AAI.R pacemaker with atrial sensing of the QRS due to a prolonged PR interval. 12 lead electrocardiogram of a patient with right ventricular dysplasia and paced rhythm A rhythm strip from a patient that shows AAI pacing competing with and resetting the patient's nodal rhythm. Atrial pacing with competition from an accelerated ventricular rhythm causing fusion complexes An irregular rhythm with an atrial pacemaker.

Ventricular Pacing

VVI with ladder diagram Ventricular paced rhythm with atrial flutter VVI pacing in patient with first degree A/V block Ventricular paced rhythm with atrial flutter after A/V nodal ablation. The effect of an acute myocardial infarction on the EKG of VVI pacing Failure to pace or a recording artifact? This is a recording from a patient with a Medtronic implantable defibrillator which also functions as a VVI pacemaker. Lead failure in a recently replaced VVI pacemaker. Escape/capture bigemini A rate responsive pacemaker with a respiratory sensor A recording showing rate hysteresis pacing during ventricular fibrillation and failure to capture after a 360 joule shock.

Pacing conduction patterns

A 12 lead electrocardiogram from a patient with a lead pacing the left ventricle. Tracings from a the same patient with right atrial appendage stimulation, R.V. septal and apical stimulation. A tracing from a patient with Mobitz I AV block where the AV conduction stops with VDD pacing even with a long sensed to paced interval of 300ms.

Pacemaker interactions

A patient with two pacemakers, a DDD and a VVI .R which is at end of life Myopotential inhibition of a VVI.R pacemaker Suppression of a VVI pacemaker with an external pacemaker

Pacemaker Pacing Artifacts

Bipolar ventricular paced rhythm with atrial flutter after A/V nodal ablation. Unipolar ventricular paced rhythm with atrial flutter

Pacemaker Follow-up

Unusual rhythms

Bigemini with magnet over the pacemaker Bigemini with atrial threshold testing conversion of atrial flutter with rapid atrial pacing followed by nodal rhythm

Threshold Testing

3 lead rhythm strip with DDD pacemaker and normal magnet response Pulse amplitude threshold testing for a ventricular pacemaker Atrial threshold testing Atrial threshold testing in a DDD pacer using the AAI mode Atrial threshold testing in a model 2102 pacemaker PVCs interfering with ventricular threshold testing The effect of a long AV interval on atrial threshold testing of a DDD Pacer Threshold testing inducing asystole in a 21 year old patient with congenital complete heart block. Two pacemakers, DDD and VVI with atrial capture in one and ventricular in the other

Strength duration curves

A strength/duration curve from an atrial lead. A strength/duration curve from a ventricular lead.

Time dependent capture
Pacemaker system failure

Pacemaker pacing failure and Mobitz II A/V block in a patient with a history of Torsade de Pointe and three degree heart block. A patient with a failing ventricular lead due to a subclavian crush.

Trans-telephonic EKG recordings

Trans-telephonic pacemaker check failure to capture Trans-telephonic pacemaker check: Failure to capture. A patient in the high Arctic. Trans-telephonic pacemaker check at the MUHC (instructions) Trans-telephonic Audio recordings The EKG and sound of a Medtronic VVI.P pacemaker with the magnet applied near the end of the recording Recording of end of life indication with magnet applied to VVI pacemaker A pacemaker that required inversion of the programming head for programming. The pacemaker could not be programmed in the usual manner in the pacemaker clinic. The pacemaker was implanted correctly with the conducting window toward the skin, but was a left-sided model which differed from the previous x-ray outline of the right-sided model. Having to invert the programming head suggests a problem with the programming head, inverted implantation of the pacemaker, or because the pacemaker electronics are functioning as a contra-lateral pacemaker. Lecture on pacemaker follow-up November 1998

Defibrillation and Cardioversion

External Cardioversion/defibrillation

Recording of a series of shocks for Atrial Flutter Sinus pause post cardioversion for atrial fibrillation An irregular rhythm after cardioversion for atrial fibrillation pacing during ventricular fibrillation caused by cardioversion and failure to capture after a 360 joule shock.

Implantable Defibrillators

Recording from a device during a spontaneous episode of ventricular fibrillation. P.A. chest film of a patient with an implantable defibrillator and an epicardial patch and S.V.C. spring electrode.

Threshold Testing

Defibrillation threshold testing of an implantable defibrillator (successful) followed by ventricular paced rhythm. Defibrillation threshold testing of an implantable defibrillator (successful) followed by sinus rhythm. Defibrillation threshold testing of an implantable defibrillator (successful) followed by sinus rhythm. Recorded using an external defibrillator.

EKG Recordings

An electrocardiogram from a patient with a cardiac myoplasty stimulator. A problem with atrial capture with a dual chamber pacemaker with a long A/V interval. A patient post pacemaker implant. for syncope A rate responsive pacemaker with respiratory sensor An ECG strip from the pacemaker clinic. A patient post DDD pacemaker implant ECG strip and images from a patient post DDD pacemaker implant. Patient with perforation of a temporary transvenous pacemaker Three EKGs and X-ray

Arrhythmias

Supraventricular Arrhythmias

Sinus pauses

Premature atrial complexes

Atrial fibrillation

Supraventricular Tachycardia

Without block
With block

Atrial Flutter

Nodal Rhythm:

Accelerated nodal rhythm

Wolf Parkinson White

Other atrial rhythms

Ventricular Arrhythmias

Premature Complexes

Bigemini

Ventricular Tachycardia

Ventricular Fibrillation