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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,...
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...
Increased pulse rate01:17

Increased pulse rate

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.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
Drug Dependence01:17

Drug Dependence

Medications are typically administered to achieve therapeutic effects. Some drugs can modify an individual's mood and perception, frequently resulting in various enjoyable experiences. However, this can result in drug dependency, a condition marked by continuous drug use despite potential negative consequences. Drug dependency primarily falls into two categories: psychological and physical dependence. Psychological dependence occurs when the pleasurable feelings induced by the drug...

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A General Method for Evaluating Deep Brain Stimulation Effects on Intravenous Methamphetamine Self-Administration
09:16

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Published on: January 22, 2016

Effect of methamphetamine dependence on heart rate variability.

Brook L Henry1, Arpi Minassian, William Perry

  • 1Department of Psychiatry, University of California San Diego, USA. blhenry@ucsd.edu

Addiction Biology
|December 25, 2010
PubMed
Summary

Methamphetamine (METH) use significantly impairs heart rate variability (HRV), indicating autonomic nervous system dysfunction. This study reveals reduced cardiac complexity and vagal activity in abstinent METH users.

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Area of Science:

  • Cardiology
  • Neuroscience
  • Autonomic Nervous System Research

Background:

  • Methamphetamine (METH) is a highly addictive stimulant linked to autonomic nervous system (ANS) dysfunction, cardiovascular issues, and neurotoxicity.
  • Heart rate variability (HRV) is a key indicator of ANS function and a predictor of mortality in various conditions, but its characterization in METH users is limited.

Purpose of the Study:

  • To investigate and characterize heart rate variability (HRV) in individuals with a history of METH dependence compared to drug-free controls.
  • To explore the relationship between METH use patterns and autonomic function.

Main Methods:

  • Recruited 17 abstinent METH-dependent individuals and 21 age/gender-matched drug-free controls.
  • Assessed HRV using time-domain, frequency-domain, and non-linear analyses during a 5-minute resting period.
  • Correlated recent METH use with sympathetic tone.

Main Results:

  • METH-dependent individuals exhibited significantly reduced HRV, diminished parasympathetic activity, and decreased heartbeat complexity compared to controls.
  • More recent METH use was associated with increased sympathetic tone.
  • Findings suggest chronic METH exposure may lead to impaired vagal function and reduced heart rate complexity.

Conclusions:

  • Chronic METH use is associated with significant autonomic dysfunction, evidenced by decreased HRV and impaired vagal tone.
  • The observed HRV alterations may be linked to the cardiotoxic or neurotoxic effects of prolonged METH exposure.
  • Impaired HRV in METH users highlights potential cardiovascular risks and warrants further investigation.