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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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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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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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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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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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Infra-His Block during Atrial Pacing-Functional or Pathological?

Raja J Selvaraj1, Binay Kumar1, Sasinthar Rangasamy1

  • 1Department of Cardiology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India.

Pacing and Clinical Electrophysiology : PACE
|December 22, 2016
PubMed
Summary

Assessing infra-His conduction abnormalities can be challenging. This report details infra-His conduction block during atrial stimulation, discussing its functional versus pathological nature.

Keywords:
Infra-His blockatrioventricular block

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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Assessing the clinical significance of infra-His conduction abnormalities in the electrophysiology lab presents diagnostic challenges.
  • Understanding the nature of these conduction blocks is crucial for patient management.

Observation:

  • This report documents a case of infra-His conduction block identified during programmed atrial stimulation.
  • The observation was made in a patient undergoing electrophysiological study.

Findings:

  • The study presents infra-His conduction block, a specific type of electrical signal delay in the heart's conduction system.
  • The findings focus on differentiating between functional and pathological causes of this conduction abnormality.

Implications:

  • The findings prompt a discussion on classifying infra-His conduction block as either a transient functional issue or a sign of underlying pathology.
  • Clarifying the nature of these blocks can improve diagnostic accuracy and guide therapeutic decisions in cardiology.