Related Experiment Video

Updated: Aug 16, 2026

EEG Mu Rhythm in Typical and Atypical Development
11:50

EEG Mu Rhythm in Typical and Atypical Development

Published on: April 9, 2014

Developmental changes in ECG associated with heart rate are similar in squirrel monkey and human infants

A G Brady1, W H Johnson, M B Botchin

  • 1Department of Comparative Medicine, University of South Alabama College of Medicine, Mobile 36688.

Laboratory Animal Science
|December 11, 1991
PubMed

Insights

Electrocardiogram (ECG) findings in squirrel monkeys reveal age-related heart rate and axis changes similar to humans. These insights aid in using squirrel monkeys as a model for pediatric cardiology research.

Area of Science:

  • Veterinary Cardiology
  • Primate Physiology
  • Comparative Cardiology

Background:

  • Squirrel monkeys (Saimiri sp.) are valuable models for pediatric cardiology studies.
  • Noninvasive diagnostic methods are crucial for characterizing these models.
  • Understanding electrocardiogram (ECG) variations with age and position is key.

Purpose of the Study:

  • To investigate electrocardiogram (ECG) changes in squirrel monkeys across different ages and body positions.
  • To characterize maturational changes in cardiac electrical activity in this primate model.
  • To inform the use of squirrel monkeys in pediatric cardiology research.

Main Methods:

  • Electrocardiograms (ECGs) were recorded from squirrel monkeys at 1 day, 1 month, and 1 year of age.
  • ECGs were obtained with animals in dorsal, ventral, and right lateral recumbency.
  • Analysis focused on heart rate, P-wave, and QRS frontal-plane axes.

Main Results:

  • Heart rates varied significantly with age, with 1-month-old infants exhibiting the highest rates.
  • A leftward shift in the QRS frontal-plane axis was observed with increasing age.
  • P-wave frontal plane axis remained relatively constant across all ages and positions.

Conclusions:

  • Squirrel monkey ECG patterns show maturational changes in heart rate and electrical axis similar to humans.
  • Despite differences in absolute heart rates, underlying maturational factors appear conserved across primate species.
  • These findings support the utility of squirrel monkeys as a comparative model in pediatric cardiology.

More Related Videos

Noninvasive Electrocardiography in the Perinatal Mouse04:36

Noninvasive Electrocardiography in the Perinatal Mouse

Published on: June 12, 2020

Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits10:25

Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits

Published on: March 27, 2021

Related Concept Videos

Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
Development of the Heart01:27

Development of the Heart

The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
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.