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Chambers of the Heart01:16

Chambers of the Heart

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The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
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Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...
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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Cardiac Catheterization II: Right Heart Catheterization01:21

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Right Heart Catheterization: An OverviewRight heart catheterization is an invasive diagnostic procedure that measures right-sided cardiac and pulmonary artery pressures, calculates cardiac output, and identifies intracardiac shunts. It provides detailed hemodynamic data essential for diagnosing and managing various cardiovascular conditions, such as pulmonary hypertension.Access SitesCommon access sites for right heart catheterization include the internal jugular vein in the neck region, the...
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A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
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A Dual-Chamber Leadless Pacemaker.

Reinoud E Knops1, Vivek Y Reddy1, James E Ip1

  • 1From Amsterdam University Medical Centers, Amsterdam (R.E.K., K.T.N.B.); Icahn School of Medicine at Mount Sinai (V.Y.R.) and Weill Cornell Medicine-New York Presbyterian Hospital (J.E.I.) - both in New York; HonorHealth Cardiac Arrhythmia Group, Scottsdale, AZ (R.D.); Foothills Medical Centre, Calgary, AB, Canada (D.V.E.); Centre Hospitalier Régional Universitaire Albert Michallon, Grenoble, France (P.D.); Texas Cardiac Arrhythmia Institute, Austin (R.C.); Azienda Ospedaliero-Universitaria Pisana, Pisa, Italy (M.G.B.); Tokyo Women's Medical University, Tokyo (M.S.); Deutsches Herzzentrum der Charité, Berlin (G.H.); Na Homolce Hospital, Prague, Czech Republic (V.Y.R., P.N.); Huntington Memorial Hospital, Pasadena (M.R.), and Abbott Medical, Sylmar (J.R.N., L.G., C.H.) - both in California; and the Cleveland Clinic, Cleveland (D.J.C.).

The New England Journal of Medicine
|May 22, 2023
PubMed
Summary
This summary is machine-generated.

A new dual-chamber leadless pacemaker system demonstrated safety and efficacy in a multicenter study. This innovative system provides reliable atrial pacing and atrioventricular synchrony for patients requiring pacemakers.

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Area of Science:

  • Cardiology
  • Medical Devices
  • Electrophysiology

Background:

  • Single-chamber leadless pacemakers lack atrial pacing and consistent atrioventricular synchrony.
  • A dual-chamber leadless system could expand treatment options for more patients.

Purpose of the Study:

  • To evaluate the safety and performance of a novel dual-chamber leadless pacemaker system.
  • Assess the system's ability to provide atrial pacing and atrioventricular synchrony.

Main Methods:

  • Prospective, multicenter, single-group study involving 300 patients.
  • Primary safety endpoint: freedom from complications at 90 days.
  • Primary performance endpoints: adequate atrial capture/sensing and at least 70% AV synchrony at 3 months.

Main Results:

  • Successful implantation in 98.3% of patients.
  • Primary safety endpoint met in 90.3% of patients, exceeding the goal.
  • Primary performance endpoints met in 90.2% (atrial function) and 97.3% (AV synchrony), surpassing goals.

Conclusions:

  • The dual-chamber leadless pacemaker system met its primary safety endpoint.
  • The system effectively provided atrial pacing and reliable atrioventricular synchrony for 3 months post-implantation.