HeartRhythm

APRIL 30, 2024

In patients undergoing non-physiologic pacemaker (PM) implantation (eg, RV pacing), cardiomyopathy (CM) may develop - particularly in patients with an elevated pacing burden.

Cardiomyopathy 40

Cardiomyopathy Electrocardiogram Pacemaker Physiology 40

HeartRhythm

MARCH 31, 2025

Implantation of transvenous pacemaker (PPM) leads in the left bundle branch area (LBBA) has been increasingly adopted into clinical practice, driven by the goal of leveraging the natural conduction system to achieve physiologic cardiac pacing.

Pacemaker 40

Pacemaker Physiology 40

HeartRhythm

APRIL 30, 2024

Left bundle branch area pacing (LBBAP) can deliver near physiological electrical activation of the heart, but reliability and stability of this approach remains unclear.

Physiology 40

Physiology Pacemaker 40

HeartRhythm

MARCH 31, 2025

MRI-conditional pacemakers were approved by the FDA in 2011. Concurrently, left bundle branch area pacing (LBBAP) has emerged as a physiologic ventricular pacing technique, involving lead placement deep in the interventricular septum. Since then, experience with MRI-conditional and non-conditional devices has grown.

Pacemaker 40

Pacemaker Physiology 40

HeartRhythm

APRIL 30, 2024

Conduction system pacing, namely His bundle and left bundle branch area (LBBA) pacing, has emerged as a promising modality to maintain physiologic conduction with ventricular pacing in several scenarios, providing patients with electrical and mechanical synchrony.

Pacemaker 40

Pacemaker Physiology Outcomes 40

The British Journal of Cardiology

DECEMBER 3, 2024

These were managed with cardioversion, drug therapy and pacemaker insertion. The unique physiology in such patients lends itself to numerous clinical considerations that would otherwise be routine management for most.

Heart Transplant 40

Heart Transplant Transplant Pacemaker Physiology 40

Frontiers in Cardiovascular Medicine

JULY 25, 2024

Left bundle branch pacing (LBBP) has proven to be an alternative method for delivering physiological pacing to achieve electrical synchrony of the left ventricle (LV), especially in patients with atrioventricular block and left bundle branch block (LBBB). Approximately 2%–12% of patients may need pacemaker implanted after Morrow surgery.

Pacemaker 52

Pacemaker Physiology Cardiomyopathy 52

Cardiomatics

APRIL 5, 2024

Interpreting the waves and detecting abnormalities: Typically, the heart conducts electricity in a pathway starting in the sinoatrial node (SA), our heart’s “natural pacemaker”, located in the wall of the right atrium. This allows the atria to fill the ventricles and achieve the highest possible stroke volume.

Arrhythmia 92

Arrhythmia Tachycardia Bradycardia Heart Rhythm 92

The British Journal of Cardiology

DECEMBER 3, 2024

Atrioventricular nodal (AVN) ablation with permanent pacemaker implantation – ‘pace and ablate’ – may be considered for patients with symptomatic atrial fibrillation (AF) for whom rhythm control has been unsuccessful. This creates concerns about inducing pacemaker dependence and potential pacemaker-induced cardiomyopathy (PICM).

Ablation 40

Ablation Pacemaker Atrial Fibrillation Physiology 40

Dr. Smith's ECG Blog

OCTOBER 19, 2022

Asynchronous pacing seems like the safe setting, EXCEPT that it means that the pacemaker can trigger on the T-wave, which can result in Ventricular Fibrillation. Our electrophysiologists give an example of this here: "Asynchronous" mode means that the pacemaker will pace regardless of what the native beats are doing.

Pacemaker 52

Pacemaker Physiology ICU Blog 52

Dr. Smith's ECG Blog

AUGUST 3, 2022

At the time this Old ECG was done — the patient had a pacemaker. Is the pacemaker functioning appropriately? ie, WHY do you think the pacemaker was needed? ). It is no longer easy ( or even possible ) to fully assess pacemaker function solely from the ECG without knowledge of pacing specifications for that particular patient.

Pacemaker 52

Pacemaker Physiology 52

Dr. Smith's ECG Blog

JANUARY 9, 2024

She had a single chamber ICD/Pacemaker implanted several years prior due to ventricular tachycardia. Seeing as the patient has a single chamber ICD/pacemaker, pacing the ventricle will also lead to AV dyssynchrony that will compromise ventricular filling, further impairing hemodynamics. small squares in width (260ms).

Tachycardia 118

Tachycardia Electrophysiology Atrial Flutter Ischemia 118

Circulation

NOVEMBER 11, 2024

It was first described over 150 years ago, however the physiological mechanism and pathophysiological implications are not well understood. This study aimed to elucidate underlying mechanisms and physiological function of vasomotion in human arteries.

Physiology 40

Physiology Pacemaker Circulation 40

All About Cardiovascular System and Disorders

APRIL 20, 2024

The depolarization phase of pacemaker cells is mainly due to L-type calcium channels (ICa-L) There is some contribution to the diastolic depolarization phase by T type calcium channels (ICa-T). The physiological and pharmacological significance of cardiovascular T-type, voltage-gated calcium channels. References Triggle DJ.

Pharmacology 52

Pharmacology Pacemaker Physiology General Cardiology 52

Journal of Cardiovascular Electrophysiology

JANUARY 29, 2025

ABSTRACT Background Left bundle branch pacing (LBBP) emerged as a novel physiological pacing modality that improves clinical outcomes. Left bundle branch pacing (LBBP) significantly increased X- and Y-axis RWA independent of pacing voltage in both CLBBB and narrow QRS patients.

Cardiac Function 40

Cardiac Function Pacemaker Physiology Outcomes 40

Journal of the American Heart Association

NOVEMBER 28, 2023

In addition, we have identified 2 cardiomyocyte‐like conducting cells, lending support to the theory that the sinoatrial node pacemaker cells are specialized cardiomyocytes.

Pacemaker 40

Pacemaker Physiology Cancer Research 40

DAIC

MAY 18, 2024

CRT, a pacemaker that corrects abnormal electrical conduction by simultaneously pacing the left and right heart chambers, is a well-established therapy for improving cardiac efficiency. Approximately 6.7 million adults in the U.S. have heart failure, and the prevalence is expected to rise to 8.5 million by 2030.

Heart Failure 52

Heart Failure Heart Rhythm Research Pacemaker 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

Dr. Sanjay Gupta

MARCH 6, 2022

It is also unique because it works using the Doppler effect, you can get not only an anatomical evaluation of the heart but also physiological assessment. Some patients with pacemakers and metal prosthesis can’t be exposed to such strong magnetic fields. An echo is easy to do, risk free and easily accessible.

Heart attacks 52

Heart attacks Heart Attack Heart Rhythm Exercise 52

The British Journal of Cardiology

JUNE 11, 2024

In ambulatory patients with complete heart block (CHB), dual-chamber (DDD) pacing confers physiological benefits versus single-chamber (VVI) pacing, however, the impact on mortality is disputed. In nonagenarians with emergent CHB, we compared the clinical characteristics and outcomes of patients receiving VVI versus DDD pacemakers.

Pacemaker 40

Pacemaker Dementia Physiology Outcomes 40

Dr. Smith's ECG Blog

JULY 19, 2024

Because of the complexity of pacemaker troubleshooting — I was happy to find the wonderful on-line “primer” ( with color-coded illustrations ) by Dr. Harry Mond — that outlines a user-friendly approach to — “Where Am I Pacing From?” NOTE #2: I always like to look for the presence of an underlying rhythm in pacemaker tracings.

Chest Pain 114

Chest Pain Myocardial Infarction Pacemaker STEMI 114

Physiologically Speaking

OCTOBER 18, 2024

Welcome to the Physiology Friday newsletter. Physiologically Speaking is a reader-supported publication. To assess the impact of light on circadian rhythms, a model of the human circadian pacemaker was used, simulating how light exposure affects circadian amplitude and phase—two critical components of a healthy internal clock.

Physiology 64

Physiology Diet Research Exercise 64

Dr. Smith's ECG Blog

JANUARY 23, 2024

Isoprenalin was discontinued, and a temporary transveous pacemaker was implanted. The patient stabilized following pacemaker placement. 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 106

Tachycardia Arrhythmia Heart Disease Sudden Cardiac Death 106

Circulation

NOVEMBER 10, 2023

Among 299 patients with CRT-pacemakers (BVP-111, LBBAP-188), VT/VF occurred in 8 patients in the BVP group vs. none in the LBBAP group (7.2% Physiologic resynchronization by LBBAP may be associated with lower risk of arrhythmias compared with BVP. The occurrence of VT/VF was significantly lower with LBBAP compared with BVP (4.2%

Atrial Fibrillation 40

Atrial Fibrillation Pacemaker Physiology Heart Failure 40

Cardiomatics

FEBRUARY 9, 2022

The aim of CRT is to restore physiologically normal electrical heart activity, which is often altered in the course of the underlying disease. This can be achieved by introducing electrodes into the vascular system which are connected to a pacemaker with a resynchronization function.

Heart Failure 52

Heart Failure Myocardial Infarction Medicare Cardiac Function 52

Frontiers in Cardiovascular Medicine

JANUARY 2, 2025

More than 1 million permanent pacemakers are implanted worldwide each year, half of which are in patients with high-grade atrioventricular block. Pacemakers provide adequate frequency support in the initial stage, but traditional right ventricular (RV) pacing may lead to or aggravate left ventricular dysfunction and arrhythmia.

Pacemaker 52

Pacemaker Defibrillator Arrhythmia Physiology 52

Dr. Smith's ECG Blog

DECEMBER 20, 2024

How does a pacemaker accomplish RBBB morphology? Quick aside on device terminology (feel free to skip): A "single chamber" pacemaker is a device with only one lead. A "dual chamber" pacemaker is a device with an atrial lead and a ventricular lead. By ignoring this, the pacemaker reduces the likelihood of PMT.

Chest Pain 101

Chest Pain Tachycardia Pacemaker Defibrillator 101

Dr. Smith's ECG Blog

APRIL 8, 2015

Negative predictors of adverse outcome: Pacemaker Pre-syncope or "near-syncope," but there is still some small risk (5, 18) These last two are identified in studies, but I consider them dangerous signs and symptoms in their own right, as above: 10. —QRS Syncope with Exertion (EGSYS) 7. S yncope while supine (EGSYS) 8. orthostatic vitals b.

Arrhythmia 52

Arrhythmia Outcomes Chest Pain Risk Factors 52

Dr. Smith's ECG Blog

NOVEMBER 3, 2024

A permanent pacemaker was placed and the patient was atrial paced at 60bpm. After pacemaker placement — a ß-blocker was initiated. Learning points : Dual AV physiology in the retrograde direction does not necessarily mean there is dual AV conduction in the antegrade direction. Figure-7: I've labeled Figure-6.

Electrophysiology 64

Electrophysiology Pacemaker Physiology Tachycardia 64

Dr. Smith's ECG Blog

NOVEMBER 11, 2024

If there is PR prolongation from one to the next, this supports Mobitz I physiology which rarely benefits from pacing. Conversely, if the PR interval is constant , this supports Mobitz II physiology, which is an indication for pacing. This pattern can be seen in both Mobitz I and Mobitz II physiology. History is often helpful.

Arrhythmia 70

Arrhythmia Bradycardia Outpatient Pacemaker 70

Dr. Smith's ECG Blog

MARCH 8, 2025

2:34 PM, following right heart catheterization She then went into atrial fibrillation with complete heart block and junctional escape rhythm prompting placement of transvenous pacemaker. Clearly the physiologic chain reaction of autonomic dysfunction seen in todays case does not commonly lead to death of the person learning this news.

Cardiomyopathy 74

Cardiomyopathy Myocardial Infarction Defibrillator Bradycardia 74