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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,...
Fetal Circulation01:14

Fetal Circulation

Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
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.
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...
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...
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).
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Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions
08:12

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Published on: June 5, 2019

Heart rate variability in preterm and term neonates.

Fabio Augusto Selig1, Emanuele Renata Tonolli, Erico Vinicius Campos Moreira da Silva

  • 1Faculdade de Medicina de São José do Rio Preto, SP, Brazil.

Arquivos Brasileiros De Cardiologia
|May 18, 2011
PubMed
Summary
This summary is machine-generated.

Preterm neonates exhibit less complex heart rate variability (HRV) than healthy term neonates. This finding suggests HRV analysis can aid in assessing autonomic maturation in preterm infants.

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Area of Science:

  • Physiology
  • Neonatal Medicine
  • Autonomic Nervous System Research

Background:

  • The autonomic nervous system, comprising sympathetic and parasympathetic components, is crucial for bodily regulation.
  • Heart rate variability (HRV) analysis, employing linear and nonlinear (Chaos Theory) techniques, is established for assessing autonomic function across various populations and conditions.

Purpose of the Study:

  • To evaluate autonomic maturation in preterm neonates (PTN) by analyzing their heart rate variability (HRV).
  • To compare HRV parameters between PTN and healthy term neonates (NT) using advanced dynamic analysis.

Main Methods:

  • HRV was assessed in 48 PTN and 78 NT using RR interval recordings.
  • Analysis encompassed time-domain (SDNN, RMSSD, SD1/SD2), frequency-domain (VLF, LF, HF, LF/HF), and chaos-theory metrics (TAU, Lyapunov Exponent, Entropy).
  • Nonparametric Kruskal-Wallis tests were used for group comparisons.

Main Results:

  • Statistically significant differences in HRV were observed between PTN and NT across all time, frequency, and chaos domain variables.
  • Preterm neonates demonstrated a demonstrably less complex HRV pattern compared to their term counterparts.

Conclusions:

  • Preterm neonates display significantly reduced heart rate variability complexity relative to term neonates.
  • HRV analysis offers a valuable non-invasive method for evaluating autonomic nervous system maturation and developmental progress in PTN.