Dr. Smith's ECG Blog

JANUARY 23, 2024

VT is the second most common presenting arrhythmia. Vaso or inotropic medications are not harmless, and can precipitate life threatening arrhythmias. The physiologic reason for this — is thought to be the result of momentarily increased circulation from mechanical contraction arising from the "sandwiched in" QRS complex.

Tachycardia 107

Tachycardia Arrhythmia Heart Disease Sudden Cardiac Death 107

Dr. Smith's ECG Blog

NOVEMBER 11, 2023

Dr. Smith circulated the initial ECG in today's case ( that I reproduce in Figure-1 ) to our group — initially without him yet knowing anything about this patient. I added, "Makes me wonder if this could be myocarditis in a younger adult — maybe even with sinus arrhythmia." Figure-1: The initial ECG in today's case.

Stroke 70

Stroke Strokes Chest Pain Cardiomyopathy 70

Dr. Smith's ECG Blog

MARCH 15, 2023

Baseline bradycardia in endurance athletes limits the use of ß-blockers. The Role of Sinus Arrhythmia: I found it interesting to compare the long lead II rhythm strips in the 3 serial tracings from today’s case ( Figure-1 ). Note fairly marked irregularity of the R-R interval — indicative of definite sinus arrhythmia.

Atrial Fibrillation 52

Atrial Fibrillation AFIB Arrhythmia Exercise 52

Dr. Smith's ECG Blog

APRIL 8, 2016

There is also bradycardia. Bradycardia puts patients at risk for "pause-dependent" Torsades de Pointes. Torsades in acquired long QT is much more likely in bradycardia because the QT interval following a long pause is longer still. malignant ventricular arrhythmias are present), rapid replacement of potassium is required.

STEMI 52

STEMI Myocardial Infarction Cardiac Arrest Arrhythmia 52

All About Cardiovascular System and Disorders

MAY 2, 2024

Athlete’s bradycardia due to increased parasympathetic tone and decreased sympathetic tone is a well-known observation. Though sinus bradycardia is usual, other abnormalities like sinus arrhythmia, sinus arrest, wandering atrial pacemaker and coronary sinus rhythm have been described. Circulation. Heart Lung Circ.

Exercise 40

Exercise Cardiomyopathy Blood Pressure Physiology 40

Dr. Smith's ECG Blog

JANUARY 30, 2019

Prior to Mizusawa's study, it was thought that the incidence of syncope, arrhythmia, or SCD in this cohort was low [7]. In light of the risk of arrhythmia events observed in the Mizusawa trial, a formal EP study might be reasonable to obtain in those with fever induced asymptomatic Brugada ECG changes to help risk stratify these patients.

Heart Rhythm 52

Heart Rhythm Sudden Cardiac Death Arrhythmia STEMI 52

Dr. Smith's ECG Blog

APRIL 8, 2015

PVCs N ot generally considered abnormal ECG findings: Isolated PAC, First Degree AV Block, Sinus bradycardia at a rate of 35-45, and Nonspecific ST-T abnormalities (even if different from a previous ECG). Thus, if there is documented sinus bradycardia, and no suspicion of high grade AV block, at the time of the syncope, this is very useful.

Arrhythmia 52

Arrhythmia Outcomes Chest Pain Risk Factors 52

Dr. Smith's ECG Blog

DECEMBER 5, 2023

A repeat ECG was performed as adult cardiology was asked to evaluate the patient for emerget PCI: Sinus bradycardia with persistent elevation in the inferior leads with reciprocal depression in aVL Patient was taken to cath lab with adult cardiology which revealed normal coronary arteries without evidence of occlusion MI. Circulation.

Pediatrics 120

Pediatrics Pericarditis COVID-19 Congenital Heart Disease 120

Dr. Smith's ECG Blog

FEBRUARY 6, 2025

The possibility of an ischemic cause of the ventricular arrhythmia has to be considered! Below in Figure-5 is a 10-minute continuous lead II recording on oral Flecainide, now showing sinus bradycardia without a single PVC! A workup was undertaken in search of a cause of the patient's ventricular arrhythmia. No PVCs are seen.

Tachycardia 72

Tachycardia Arrhythmia Ablation Atrial Flutter 72

Dr. Smith's ECG Blog

FEBRUARY 4, 2025

Perhaps because the bradycardia in vasovagal syncope is only one part of the autonomic response. Phase 4 block is also referred to as "bradycardia dependent block." Circulation , 143 (10), 10621065. A stunning result. One of many examples in medical history that remind us of the importance of blinding in clinical trials.

Pacemaker 84

Pacemaker Bradycardia Document Heart Rhythm 84