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Related Concept Videos

Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

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.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
Regulation of Heart Rates01:31

Regulation of Heart Rates

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).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...
Decreased pulse rate01:14

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 bradycardia...

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Related Experiment Video

Updated: Jul 15, 2026

Software for Analysis of Heart Rate and Blood Pressure Time-series Data from the Valsalva Maneuver
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Software for Analysis of Heart Rate and Blood Pressure Time-series Data from the Valsalva Maneuver

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[Heart rate variability and vasovagal syncope].

E Salameh1, Z Kadri, R Neemtallah

  • 1Service de cardiologie, Hôpital Hôtel-Dieu de France, rue Alfred-Naccache, Beyrouth, Liban. etsalame@hotmail.com

Annales De Cardiologie Et D'Angeiologie
|May 8, 2007
PubMed
Summary

Heart rate variability (HRV) analysis reveals significantly higher values in patients diagnosed with vasovagal syncope compared to healthy individuals. This finding suggests HRV is a valuable tool for evaluating syncope of unknown origin.

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Last Updated: Jul 15, 2026

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Area of Science:

  • Cardiology
  • Autonomic Nervous System Research
  • Medical Diagnostics

Context:

  • Vasovagal syncope diagnosis often relies on Tilt Table testing.
  • Autonomic nervous system (ANS) function is crucial in syncope development.
  • Heart rate variability (HRV) offers insights into ANS fluctuations.

Purpose:

  • To investigate the role of HRV in patients with vasovagal syncope.
  • To compare HRV parameters between syncope patients and healthy controls.
  • To assess the diagnostic value of HRV in syncope evaluation.

Summary:

  • A prospective study analyzed 123 patients with recurrent syncope and 82 healthy volunteers using 24-hour ambulatory electrocardiography.
  • Time domain analysis of HRV showed significantly increased parameters (SDNNidx, rMSSD, SDNN, SDANN, pNN50) in the vasovagal syncope group.
  • Results indicate elevated HRV values are characteristic of vasovagal syncope.

Impact:

  • HRV analysis, specifically time domain metrics, demonstrates increased values in vasovagal syncope patients.
  • This suggests HRV is a practical and complementary diagnostic tool for syncope of unknown etiology.
  • The findings support the integration of HRV assessment into routine syncope workups.