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Regulation of Heart Rates01:31

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The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
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The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
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Increased pulse rate01:17

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Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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Decreased pulse rate01:14

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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.
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Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions
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Heart Rate Variability in Hyperthyroidism: A Systematic Review and Meta-Analysis.

Valentin Brusseau1, Igor Tauveron1,2, Reza Bagheri3

  • 1Endocrinology Diabetology and Metabolic Diseases, CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, F-63000 Clermont-Ferrand, France.

International Journal of Environmental Research and Public Health
|March 25, 2022
PubMed
Summary

Hyperthyroidism significantly reduces heart rate variability (HRV), indicating poorer cardiovascular health. This study highlights increased sympathetic and decreased parasympathetic activity in hyperthyroid patients.

Keywords:
autonomic nervous activitybiomarkerpreventionpublic healththyroid

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Area of Science:

  • Cardiology
  • Endocrinology
  • Physiology

Background:

  • Thyroid hormones influence cardiovascular function.
  • Heart rate variability (HRV) is a key indicator of autonomic nervous system activity and cardiovascular health.
  • The specific impact of hyperthyroidism on HRV requires comprehensive evaluation.

Purpose of the Study:

  • To systematically review and meta-analyze the effects of hyperthyroidism on various HRV parameters.
  • To determine the relationship between hyperthyroidism severity and HRV alterations.
  • To explore the association between thyroid hormone levels and HRV.

Main Methods:

  • Systematic review and meta-analysis of studies published until August 2021.
  • Inclusion of studies comparing untreated hyperthyroidism patients with healthy controls.
  • Random-effects meta-analysis stratified by hyperthyroidism severity for HRV parameters including RR intervals, SDNN, RMSSD, pNN50, TP, LFnu, HFnu, VLF, and LF/HF ratio.

Main Results:

  • A meta-analysis of 22 studies (1002 hyperthyroid patients, 9809 controls) revealed significant decreases in RR intervals, SDNN, RMSSD, pNN50, total power, HFnu, and VLF power.
  • Significant increases were observed in LFnu and the LF/HF ratio.
  • Effect sizes were generally larger in overt hyperthyroidism compared to subclinical cases, with lower RR intervals linked to higher thyroid hormones and lower TSH.

Conclusions:

  • Hyperthyroidism is associated with significantly reduced HRV, reflecting altered autonomic nervous system balance.
  • The findings suggest increased sympathetic and decreased parasympathetic activity in hyperthyroid individuals.
  • These HRV changes may have important clinical implications for cardiovascular risk management in hyperthyroidism.