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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...

Heart Failure II: Pathophysiology

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...

Pathophysiology of Heart Failure

Pathophysiology of Heart Failure

Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...

Electrophysiology of Normal Cardiac Rhythm

Electrophysiology of Normal Cardiac Rhythm

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...

Mechanism of Cardiac Arrhythmias

Mechanism of Cardiac Arrhythmias

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.

Decreased pulse rate

Decreased pulse rate

Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...

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Related Experiment Video

Updated: Jun 12, 2025

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection

Published on: February 17, 2015

Aging and sinus node dysfunction: mechanisms and future directions.

Thassio Mesquita¹, Rodrigo Miguel-Dos-Santos¹, Eugenio Cingolani¹

¹Cedars-Sinai Medical Center, Smidt Heart Institute, 8700 Beverly Boulevard, Davis Building, Los Angeles, CA 90048, U.S.A.

Clinical Science (London, England : 1979)

|June 11, 2025

Summary

This summary is machine-generated.

Aging causes heart rate decline by altering the sinoatrial node (SAN). This review explores age-related SAN dysfunction (SND) mechanisms and future therapeutic targets for better heart health.

Keywords:

aging cardiac arrhythmia cardiac conduction system sinoatrial node sinus node dysfunction

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Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice

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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

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Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice

Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice

Published on: October 23, 2016

Area of Science:

Cardiology
Gerontology
Physiology

Background:

Aging naturally reduces heart rate, impacting the sinoatrial node (SAN), the heart's primary pacemaker.
Sinoatrial Node Dysfunction (SND) incidence rises sharply after age 65, causing symptoms like syncope.
Increased longevity necessitates understanding aging-related SND for effective treatments.

Purpose of the Study:

To review current knowledge on age-related changes in SAN function.
To highlight ionic and structural remodeling contributing to SND.
To identify future research directions for novel therapeutic strategies.

Main Methods:

Literature review of aging and cardiac electrophysiology.
Analysis of studies on SAN structure and function.
Synthesis of research on age-related ionic channel alterations.

Main Results:

Aging leads to significant ionic and structural changes within the SAN.
These alterations result in decreased pacemaker function and increased susceptibility to arrhythmias.
Current understanding points to specific molecular pathways affected by aging.

Conclusions:

Age-related SAN dysfunction is a critical issue in geriatrics.
Further research into the molecular mechanisms of aging-related SND is essential.
Developing targeted therapies for SND is crucial for improving quality of life in the elderly.