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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

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An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
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Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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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...
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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
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Exercise Stress Test01:26

Exercise Stress Test

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
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ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....
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Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

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Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...
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Author Spotlight: Exercise Test for Evaluation of the Functional Efficacy of the Pig Cardiovascular System
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Author Spotlight: Exercise Test for Evaluation of the Functional Efficacy of the Pig Cardiovascular System

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ELECTROCARDIOGRAPHY, HEART SCORE AND HAEMATOLOGY OF HORSES COMPETING IN AN ENDURANCE RIDE.

R J Rose1, J E Ilkiw1, D Hodgson1

  • 1Department of Veterinary Clinical Studies, University of Sydney, New South Wales 2006.

Australian Veterinary Journal
|December 14, 2017
PubMed
Summary
This summary is machine-generated.

Faster horses in endurance rides showed higher heart scores and packed cell volume (PCV), indicating better performance despite dehydration. No electrocardiogram abnormalities were observed in any horses during the 100 km event.

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Area of Science:

  • Equine sports medicine
  • Veterinary cardiology
  • Animal physiology

Background:

  • Endurance riding is a demanding equestrian sport.
  • Assessing equine physiological responses during endurance events is crucial for performance and welfare.
  • Heart score and hydration markers like packed cell volume (PCV) and total plasma protein (TPP) are key indicators.

Purpose of the Study:

  • To investigate the relationship between heart scores, hydration status, and performance in horses during a 100 km endurance ride.
  • To determine if physiological parameters differ between faster and slower horses or those eliminated from the competition.
  • To assess the incidence of electrocardiogram abnormalities post-endurance ride.

Main Methods:

  • Electrocardiograms (ECGs) were recorded before and after the ride in 31 horses.
  • Blood samples were collected pre-ride, mid-ride (60 km), and post-ride to measure PCV and TPP.
  • Horses were categorized into faster, slower, and eliminated groups based on performance and heart rate recovery.
  • Statistical analyses were performed to compare physiological parameters between groups.

Main Results:

  • Faster horses exhibited significantly higher heart scores compared to slower or eliminated horses.
  • No electrocardiogram abnormalities were detected in any horses post-ride.
  • Horses generally showed signs of dehydration, evidenced by increased PCV and TPP values during the ride.
  • The faster group had significantly higher PCV and heart rates at mid-ride and post-ride sampling points.
  • Despite differences in PCV, TPP levels did not significantly differ between the faster and slower groups, suggesting similar dehydration levels.

Conclusions:

  • Higher heart scores in faster horses may indicate better cardiovascular fitness or adaptation to endurance exercise.
  • The study confirmed dehydration occurs during 100 km endurance rides.
  • While PCV differed between performance groups, TPP did not, suggesting complex hydration regulation or measurement limitations.
  • ECG monitoring confirmed the safety of the 100 km distance in terms of cardiac electrical activity.