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Related Concept Videos

Dysrhythmias VI: Management of Dysrhythmias01:25

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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong 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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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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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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Related Experiment Video

Updated: Dec 25, 2025

Translational Rabbit Model of Chronic Cardiac Pacing
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Leadless pacemakers - The path to safer pacing?

Ramesh Nadarajah1, Noman Ali1, Peysh A Patel1

  • 1Department of Cardiology, Leeds Teaching Hospitals NHS Trust, UK.

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Summary

Leadless pacemakers offer an alternative to traditional transvenous pacemakers (TVPs) for bradyarrhythmia treatment. While promising, this nascent technology faces limitations restricting its current widespread adoption.

Keywords:
ArrhythmiaCardiacCardiac pacingLeadless pacingPacemaker

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Area of Science:

  • Cardiology
  • Medical Devices
  • Electrophysiology

Background:

  • Transvenous permanent pacemakers (TVPs) are standard for bradyarrhythmia treatment but carry implantation and long-term risks.
  • Leadless pacemakers represent a novel approach, with self-contained devices implanted directly into the right ventricle.

Purpose of the Study:

  • To provide a contemporary critique of leadless pacemaker technology.
  • To evaluate the design types, evidence base, and limitations of leadless pacing.

Main Methods:

  • Review of clinical trial data and existing literature on leadless pacemaker systems.
  • Analysis of design variations and implantation techniques.
  • Assessment of current clinical indications and contraindications.

Main Results:

  • Two leadless pacemaker systems have been developed; only one is currently available.
  • Clinical trial results for leadless pacemakers are promising.
  • Current use is limited to specialist centers for specific indications and patients unsuitable for conventional pacing.

Conclusions:

  • Leadless pacemaker technology shows potential but requires further development to overcome existing hurdles.
  • Wider adoption is contingent on addressing limitations and expanding indications beyond current contraindications for TVPs.