HeartRhythm

MAY 28, 2024

We and others have investigated techniques for effective hiPSC differentiation and maturation by providing a tissue-specific microenvironment to encourage physiologically relevant model systems.

Arrhythmia 40

Arrhythmia Physiology Research 40

Dr. Smith's ECG Blog

NOVEMBER 26, 2018

In some cases the ischemia can be seen "through" the flutter waves, whereas in other cases the arrhythmia must be terminated before the ischemia can be clearly distinguished. This case represents the same physiologic event as OMI in terms of the result on the myocardium, therefore with identical ECG features, however there may not be ACS!

Ischemia 52

Ischemia Atrial Flutter Arrhythmia Tachycardia 52

Frontiers in Cardiovascular Medicine

JULY 10, 2024

These adverse effects result in conditions such as arrhythmia or a more serious reduction in left ventricular ejection fraction (LVEF), which can lead to heart failure and death.

Physiology 52

Physiology Heart Failure Arrhythmia Heart Disease 52

DAIC

APRIL 18, 2024

This forms the physiologic rationale for the accepted convention of a three-month blanking period, during which arrhythmia recurrences are presumed to be relatively benign and not indicative of treatment failure. However, this reasoning disregards valuable data regarding early arrhythmia recurrences and their potential significance.

Atrial Fibrillation 111

Atrial Fibrillation Ablation Heart Rhythm Article 111

HeartRhythm

JANUARY 25, 2024

Early recurrence of atrial arrhythmia (ERA) is commonly seen following catheter ablation of atrial fibrillation (AF), with reported incidences of up to 61% in the first three months.1 1 ERA is often attributed to transient inflammation induced by tissue damage during ablation and short-term imbalances in autonomic innervation.

Atrial Fibrillation 45

Atrial Fibrillation Ablation Arrhythmia Physiology 45

Circulation: Arrhythmia and Electrophysiology

FEBRUARY 10, 2025

Circulation: Arrhythmia and Electrophysiology, Ahead of Print. While any arrhythmia patient may recur after acutely successful ablation, AF is unusual in that patients may have long-term arrhythmia freedom despite a lack of acute success. The external validation cohort showed similar results (area under the curve=0.81

Atrial Fibrillation 40

Atrial Fibrillation Ablation Physiology Arrhythmia 40

MIBHS

JANUARY 31, 2025

The Role of Wearable Technology in Heart Health Wearable tech is designed to monitor physiological data and provide actionable insights to users. Risk Reduction Data from wearables can identify potential risks, such as undiagnosed arrhythmias or hypertension, allowing healthcare teams to address these issues before surgery.

Heart Rhythm 52

Heart Rhythm Technology AFIB Exercise 52

Journal of Cardiovascular Electrophysiology

JANUARY 4, 2024

Abstract Introduction Dual atrioventricular nodal non-reentrant tachycardia (DAVNNT) is a rare and challenging-to-diagnose arrhythmia, without previous reports associating it with a leftward inferior extension (LIE). Methods Diagnosis was made using adenosine triphosphate (ATP) injection during atrial pacing in a suspected DAVNNT patient.

Tachycardia 40

Tachycardia Physiology Ablation Arrhythmia 40

ECG Guru

JULY 31, 2023

The ECG shows a sinus rhythm with significant sinus arrhythmia. The heart rate increases with inspiration and decreases with expiration, which is called respiratory sinus arrhythmia. The QRS-axis is between 60 and 90 degrees, which is physiological at this age. Is there cause for concern?

Arrhythmia 40

Arrhythmia Physiology 40

Frontiers in Cardiovascular Medicine

JULY 2, 2024

It is proven challenging managing chronic cardiovascular illnesses like atherosclerosis, arrhythmias, and diverse cardiomyopathies. Several approaches have been found in the current literature, aiming at improving physiological acceptance, i.e., to reduce toxicity. In certain cases, there is no approved treatment.

Atherosclerosis 52

Atherosclerosis Cardiovascular Disease Physiology Biomarkers 52

Circulation

NOVEMBER 11, 2024

This study underscores the need for risk stratification in patients with Fontan physiology undergoing SVT ablation and informs future research directions for enhancing ablation outcomes. Tricuspid atresia and elevated BNP levels were associated with increased risk of SVT recurrence (Table).Conclusion:Recurrence

Ablation 40

Ablation Atrial Flutter Outcomes Arrhythmia 40

Frontiers in Cardiovascular Medicine

JANUARY 7, 2024

Electrocardiogram in clinic showed sinus arrhythmia with early repolarization and no ischemic changes. A 14-year-old male with no significant medical history presented with intermittent palpitations for 2–3 months that occurred at rest and were associated with light-headedness.

Chest Pain 59

Chest Pain Exercise Electrocardiogram Echocardiogram 59

Ken Grauer, MD

DECEMBER 23, 2023

KEY Point: Knowing that the most commonly overlooked arrhythmia is AFlutter — suggests that the BEST way to avoid missing the diagnosis of AFlutter is simply to THINK of AFlutter whenever you have a regular SVT at a rate close to 150/minute ( in which you do not clearly see upright sinus P waves in lead II ).

Blog 176

Blog Tachycardia Tricuspid Atrial Flutter 176

Journal of Cardiovascular Electrophysiology

MAY 31, 2024

Programmed electrical stimulation of the heart and noninvasive ambulatory monitoring provided new methodologies to study clinical cardiac arrhythmias. Neurology and cardiology emerged as specialties of medicine in the early 20th century.

Sudden Cardiac Death 40

Sudden Cardiac Death Physiology Arrhythmia 40

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

Circulation: Arrhythmia and Electrophysiology

FEBRUARY 23, 2024

Circulation: Arrhythmia and Electrophysiology, Ahead of Print. A physiological commotio cordis model was utilized to assess variables that predicted for SCD. Next, a surrogate model was developed based on data from the physiological model, and the attenuation in risk was assessed.

Sudden Cardiac Death 40

Sudden Cardiac Death Physiology Electrophysiology Arrhythmia 40

Physiologically Speaking

FEBRUARY 28, 2024

” While an awe-inspiring anecdote, our knowledge of human limits, physiology, and the sheer number of participants in endurance sports is enough evidence to conclude that running a marathon won’t kill you. Physiologically Speaking is a reader-supported publication. Pheidippides’ story is provocative.

Exercise 98

Exercise Sudden Cardiac Death Physiology Congenital 98

Dr. S. Venkatesan MD

JUNE 16, 2024

Any deviation or trespassing results in arrhythmia. Like hemodynamics of blood , an “electro-dynamic” flow cycle exists that is critically important both in physiology and pathology. Like coronary blood flow, intra-cardiac electricity must flow in a pre-designated path at a specific time interval with absolute discipline.

Ablation 52

Ablation Physiology Technology Bicuspid/Mitral 52

Circulation: Arrhythmia and Electrophysiology

DECEMBER 21, 2023

Circulation: Arrhythmia and Electrophysiology, Ahead of Print. BACKGROUND:MicroRNA-1 (miR1), encoded by the genesmiR1-1andmiR1-2, is the most abundant microRNA in the heart and plays a critical role in heart development and physiology.

Electrophysiology 40

Electrophysiology Myocardial Infarction Atrial Fibrillation Arrhythmia 40

Circulation

NOVEMBER 11, 2024

Physiological class (PC) was determined by clinicians according to the 2018 AHA/ACC guidelines. Feature-tracking of SSFP cine was retrospectively utilized to quantify radial, circumferential, and longitudinal strain in both 2 and 3 dimensions. Clinical events (e.g., for each) except 3D global radial strain.

Outcomes 40

Outcomes Congenital Physiology Heart Failure 40

MIBHS

NOVEMBER 30, 2023

The exact mechanisms behind this link are complex, but it’s believed that the combination of lifestyle factors associated with depression (such as poor diet, lack of exercise, and smoking) and the physiological effects of depression on the body (including inflammation and blood clotting) can contribute to heart problems.

Blood Pressure 52

Blood Pressure Heart Disease Blood Clot Physiology 52

Dr. Smith's ECG Blog

JANUARY 5, 2024

And, the drug does provide physiologic benefits for a patient with an acute cardiac event ( ie, it helps to relieve anxiety as well as pain — which may decrease activation of autonomic nervous system activity — often resulting in reduced heart rate, blood pressure, venous return and myocardial oxygen demand — Murphy et al: StatPearls, 2023 ).

Angina 121

Angina Plaque Document Stents 121

Ken Grauer, MD

MARCH 23, 2023

A series of cardiac arrhythmias were seen during the course of her resuscitation — including the interesting arrhythmia shown in the long lead II of Figure-1. PEARL # 5: The simple act of labeling P waves can be invaluable for solving an arrhythmia. Figure-6: Laddergram illustration of the mechanism in today's arrhythmia.

Blog 78

Blog Tachycardia Arrhythmia Atrial Flutter 78

Dr. Smith's ECG Blog

SEPTEMBER 9, 2020

== MY Arrhythmia Case by K EN G RAUER, MD ( 9/9/2020 ): == PREFACE: Recognition of the presence ( or absence ) of AV block is a common problem in emergency medicine. I find it helpful in sorting out complex arrhythmias to search out P waves at an early point in the process. Is There a Regular P Wave Rhythm?

Arrhythmia 52

Arrhythmia Physiology Hospital Blog 52

All About Cardiovascular System and Disorders

MAY 2, 2024

It is a physiological adaptation helping athletes perform physical tasks better than non-athletes. Though sinus bradycardia is usual, other abnormalities like sinus arrhythmia, sinus arrest, wandering atrial pacemaker and coronary sinus rhythm have been described. References 1.Prior Prior DL et al. The athlete’s heart. Athlete’s heart.

Exercise 40

Exercise Cardiomyopathy Blood Pressure Physiology 40

Circulation

NOVEMBER 11, 2024

6h postdose PR intervals physiologically adjusted to changing HR, and stayed within normal range. Findings also confirm previous healthy volunteer trials with IR NIC highlighting no tendency promoting arrhythmia in normal, non-ischemic myocardium.

Angina 40

Angina Electrophysiology Physiology Arrhythmia 40

Circulation

NOVEMBER 10, 2023

Physiologic resynchronization by LBBAP may be associated with lower risk of arrhythmias compared with BVP. This difference remained significant after adjustment for differences in baseline characteristics between patients with BVP and LBBAP.

Atrial Fibrillation 40

Atrial Fibrillation Pacemaker Physiology Heart Failure 40

Dr. Sanjay Gupta

SEPTEMBER 25, 2022

An ectopic heartbeat is a type of arrhythmia, or an irregular heartbeat. This can then become a vicious cycle – if we feel anxious, frightened, or stressed in response to an ectopic beat this can lead to physiological symptoms associated with the stress response including changes to our heart rate. What are ectopic heartbeats?

Heart Attack 52

Heart Attack Heart attacks Physiology Article 52

Dr. Smith's ECG Blog

JANUARY 9, 2024

AV synchrony and physiologic ventricular depolarization the hemodynamics improved. Lowering the back up rate (LRL) of the ICD/pacer allowed for an intrinsic rhythm with physiologic AV conduction and normal AV synchrony with resultant increase in stroke volume and cardiac outpt. Why was it Wrong to Think the Rhythm was AFlutter?

Tachycardia 119

Tachycardia Electrophysiology Atrial Flutter Ischemia 119

Dr. Smith's ECG Blog

DECEMBER 24, 2023

While these do not alter emergency management of this patient's arrhythmia — They should be noted. It simply does not make physiologic sense to suddenly see an all-negative QRS complex in this most lateral chest lead. I believe there are several technical misadventures in today's tracings. Lead V6 in ECG #1 looks misplaced.

Atrial Flutter 127

Atrial Flutter Blog Aortic Aortic valve 127

Dr. Smith's ECG Blog

APRIL 6, 2023

Taking a Closer LOOK : There is a fairly marked sinus arrhythmia ( RED arrows in Figure-2 ). PEARL # 1: It is common with 2nd- and 3rd-degree AV block to see a "ventriculophasic" sinus arrhythmia. I've also carefully measured all P-P intervals in milliseconds — to illustrate the surprisingly marked sinus arrhythmia.

Arrhythmia 52

Arrhythmia Atrial Fibrillation AFIB Outpatient 52

All About Cardiovascular System and Disorders

APRIL 1, 2024

Another problem with atrial switch operation is that, they are likely to have atrial arrhythmias, and several other problems and the physiology is not exact as in case of arterial switch operation. Long term results are much better than atrial switch operations.

Pulmonary 52

Pulmonary Stenosis Anatomy Physiology 52

Physiologically Speaking

SEPTEMBER 13, 2024

Welcome to the Physiology Friday newsletter. Physiologically Speaking is a reader-supported publication. This study is " atypical " because it’s a case study — an n=1 characterization of an extreme outlier of physiology, performance, and healthy aging. How much exercise is too much exercise? J Appl Physiol (1985).

Physiology 105

Physiology Exercise Atrial Fibrillation Risk Factors 105

Dr. S. Venkatesan MD

FEBRUARY 20, 2024

We wish, our understanding about cardiac contractile physiology is deep and nearly complete. In myocardial pathology, the genesis and sustainability of ventricular arrhythmia are intricately related to the degree of LV dysfunction of any cause.

Defibrillator 52

Defibrillator Heart Failure Sudden Cardiac Death Cardiomyopathy 52

Dr. Smith's ECG Blog

JANUARY 6, 2024

The atrial rate is around 120 beats per minute, which indicates high adrenergic state and physiologic distress! Never forget that sinus tachycardia is the scariest arrhythmia. This is sinus tachycardia (rhythm) with complete heart block (AV node function) with ventricular escape rate just below 30.

Blog 111

Blog Ischemia Tachycardia STEMI 111

Dr. Smith's ECG Blog

NOVEMBER 19, 2016

myocardial infarction), arrhythmias, valvular pathology, shunts, or outflow obstructions. Any alteration in physiology can change "compensated" AS to "decompensated" AS. Inotropes and Vasopressors: Review of Physiology and Clinical Use in Cardiovascular Medicine. Am J Cardiol 2011;107:495-500. Circulation. 2008;118:1047-1056.

Ischemia 40

Ischemia Cardiogenic Shock Aortic Stenosis 40

Dr. Smith's ECG Blog

OCTOBER 13, 2022

In other cases, the bypass tracts conduct intermittently, depending upon other factors such as cardioactive medication use, physiological stressors with catecholamine release, the development of coronary ischemia, and normal aging.”[3] Delta waves are seen in 11/12 leads.

Chest Pain 52

Chest Pain Myocardial Infarction Ischemia STEMI 52