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Related Concept Videos

Imbalances in Cardiac Output01:26

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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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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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
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Related Experiment Video

Updated: Nov 6, 2025

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine
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Troubleshooting a pacemaker output failure: A case report.

Praveen G Pai1, Nischal N Hegde1

  • 1Department of Cardiology, Amrita Institute of Medical Sciences, Kochi, India.

Journal of Electrocardiology
|May 6, 2021
PubMed
Summary

Modern pacemakers feature automatic sensitivity (AutoSense) to prevent sensing issues. This case highlights oversensing despite AutoSense being active, leading to misdiagnosis and unnecessary lead replacement recommendations.

Keywords:
Auto-senseAutomatic sensitivity functionLead oversensingLead sensitivity settingLoss of pacingOutput failurePacemaker troubleshoot

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Permanent pacemaker (PM) implantation is increasing, demanding efficient patient follow-up and device management.
  • Modern pacemakers offer features like automatic sensitivity (AutoSense) to optimize performance and reduce clinical burden.
  • AutoSense aims to prevent undersensing and oversensing by continuously adjusting sensitivity based on intrinsic cardiac signals.

Observation:

  • A case is presented where oversensing occurred in a patient with a permanent pacemaker.
  • The 'AutoSense' function was active during the event, suggesting a potential limitation or malfunction of this feature.
  • The oversensing was initially misinterpreted as a lead integrity issue.

Findings:

  • Oversensing persisted despite the 'automatic sensitivity function' (AutoSense) being engaged.
  • The device's automatic adjustment feature did not adequately prevent inappropriate sensing in this scenario.
  • The clinical team considered ventricular lead replacement due to the perceived sensing problem.

Implications:

  • This case underscores the potential for oversensing even with advanced pacemaker features like AutoSense.
  • Misinterpretation of pacemaker behavior can lead to incorrect diagnoses and unnecessary invasive procedures.
  • Further investigation into the limitations of AutoSense and improved diagnostic algorithms for pacemaker function is warranted.