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Related Concept Videos

Cardiomyopathy VII: Pre and Post Operative Nursing Management01:28

Cardiomyopathy VII: Pre and Post Operative Nursing Management

Patients with hypertrophic cardiomyopathy (HCM) and left ventricular outflow tract (LVOT) obstruction who remain symptomatic despite optimal medical therapy may undergo a septal myectomy (Morrow procedure). This procedure involves excising a portion of the hypertrophied septum below the aortic valve using a heart-lung machine to improve blood flow through the LVOT. Effective preoperative and postoperative nursing management ensures successful patient outcomes, minimizes complications, and...
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 III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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 minute.
Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
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...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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Related Experiment Video

Updated: May 17, 2026

Autonomic Function Following Concussion in Youth Athletes: An Exploration of Heart Rate Variability Using 24-hour Recording Methodology
05:48

Autonomic Function Following Concussion in Youth Athletes: An Exploration of Heart Rate Variability Using 24-hour Recording Methodology

Published on: September 21, 2018

Heart rate variability exhibits complication-dependent changes postsurgery.

Patrick Scheffler1, Salvatore Muccio, Giordano Egiziano

  • 11Department of Medicine, Faculty of Medicine, McGill University, Montreal, Quebec, Canada.

Angiology
|October 24, 2012
PubMed
Summary
This summary is machine-generated.

Postoperative complications after abdominal surgery are linked to changes in heart rate variability (HRV). This noninvasive method may help monitor surgical stress response and predict patient outcomes.

Keywords:
C-reactive proteinheart rate variabilityperioperative complicationssurgical stress

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Published on: June 5, 2019

Area of Science:

  • Physiology
  • Surgical Medicine
  • Biomedical Engineering

Background:

  • The surgical stress response involves systemic inflammation and autonomic nervous system changes.
  • C-reactive protein (CRP) is a common marker, but additional noninvasive measures are needed.
  • Arterial stiffness and heart rate variability (HRV) reflect vascular and autonomic function, respectively.

Purpose of the Study:

  • To assess arterial stiffness and HRV as indicators of the surgical stress response.
  • To investigate the association between these parameters and postoperative complications.
  • To explore the potential of HRV as a noninvasive monitoring tool.

Main Methods:

  • Measured CRP, arterial stiffness, and HRV in 47 abdominal surgery patients preoperatively and on postoperative days 1 and 2.
  • Analyzed time-domain (pnn50) and frequency-domain (LF/HF ratio) HRV parameters.
  • Compared measurements between patients with and without complications.

Main Results:

  • Postoperative CRP levels were higher in patients with complications.
  • Patients with complications showed increased HRV and pnn50 on postoperative day 2.
  • A trend towards an increased LF/HF ratio was observed in complicated cases on postoperative day 2.

Conclusions:

  • Perioperative changes in HRV parameters correlate with the development of postoperative complications.
  • HRV monitoring offers a promising noninvasive approach to assess surgical stress.
  • Further research with larger cohorts is warranted to validate these findings.