DOI: 10.5061/dryad.0gb5mkmd9
title: Data From: Cardiac arrhythmia prevalence and risk factors in 24-h electrocardiograms of sedentary horses

description: Background: Cardiac arrhythmias are common in horses, but their clinical
 relevance remains controversial. Objectives: To describe prevalence and
 identify risk factors for arrhythmias that may warrant additional
 screening in a sedentary mixed-breed population of horses. Study Design:
 Prospective cross-sectional. Methods: Ninety-four clinically healthy,
 university-owned, sedentary horses underwent 24-h ambulatory
 electrocardiograms and echocardiograms. Potential risk factors were
 recorded for all horses. Affected individuals were defined as those with
 &gt;1 supraventricular premature complex/h or with any ventricular
 premature complexes for risk factor analysis. Forward stepwise logistic
 regression was used to identify factors associated with the presence of
 arrhythmia. The p value &lt;0.15 was considered significant in
 univariable screening and p ≤ 0.05 was considered significant overall.
 Results: During recording, 92.6% (87/94) of horses experienced an
 arrhythmia. Supraventricular premature complexes were present in 86.2%
 (81/94) of the horses, and ventricular complexes were present in 24.5%
 (23/94) of the horses. Of the sample, 38.3% (36/94) were considered
 affected by arrhythmias. Increased heart girth score was associated with
 detection of arrhythmias (OR 1.06, 95% CI 1–1.12, p = 0.05), and age was
 retained in the final model as a confounder. Main Limitations: The study
 sample included a limited range of body condition scores and number of
 stallions for risk factor analysis. Conclusion: Arrhythmias occurred with
 high frequency in this group of horses despite no known history or
 clinical signs of cardiovascular disease. Increased heart Q2 girth is a
 potential risk factor for arrhythmia in the horse.
description: # Data From: Cardiac arrhythmia prevalence and risk factors in 24-h
 electrocardiograms of sedentary horses Dataset DOI:
 [10.5061/dryad.0gb5mkmd9](10.5061/dryad.0gb5mkmd9) ## Description of the
 data and file structure These include the reports and tabulated data from
 horses undergoing a 24-h ambulatory electrocardiogram. The key for the
 breed and sex codes is in the tabulated Excel which includes signalment of
 the horses by ID number used on each report. Reports contain some
 additional data that is not tabulated, such as HRV measures and images of
 the ECGs. ### Files and variables Variables and descriptions for each
 column of Excel file are described below: * Number: Randomized number
 assigned to each horse for blinding * Date: Date ECG was collected *
 Breed: Breed of Horse * Breed Code: Breed Code used for statistical
 analysis (Coding available on second tab of Excel sheet) * Sex: Sex of
 horse (Coding available on second tab of Excel sheet) * Weight (kg):
 Weight of horse recorded in kilograms on day of ECG * Age (Years): Age of
 horse in years at date of ECG * Height (cm): Height of horse measured in
 centimeters at the top of the wither on day of ECG * Heart Girth (cm):
 Heart girth of horse measured in centimeters on day of the ECG * BCS: Body
 Condition Score measured utilizing Henneke 1-9 method * CTNI: Cardiac
 Troponin I level measured in ng/mL * Analyzed Duration: Analyzed duration
 of ECG recording (hours), excludes any period of time on recording that
 was unable to be analyzed due to artifact * Avg HR: Average heart rate *
 Supraventricular: Number of supraventricular premature complexes on
 recording * SVPC/Hour: Number of supraventricular premature complexes
 divided by the number of recorded analyzed hours * Ventricular: Number of
 ventricular complexes on recording * VC/Hour: Number of ventricular
 complexes divided by the number of recorded analyzed hours * Pauses:
 Number of pauses (sinus pauses and second degree atrioventricular block)
 on recording * Pauses/Hour: Number of pauses divided by the number of
 recorded analyzed hours * Unknown: Number of unknown complexes on
 recording * RMSSD (ms): Root mean squared of successive differences
 measured in milliseconds * SDNN (ms): Standard deviation of NN intervals
 measured in milliseconds * MR: Mitral valve regurgitation score * AR:
 Aortic valve regurgitation score * TR: Tricuspid valve regurgitation score
 * PR: Pulmonic valve regurgitation score * Notes: Relevant notes for each
 individual's available dataset * VC: Ventricular Complexes present=1
 or absent=0, used for data analysis * SVPC: Supraventricular Premature
 Complexes present=1 or absent=0, used for data analysis * SVPC &gt;1:
 Supraventricular Premature Complexes at &gt;1/hour of recording present=1
 or absent=0, used for data analysis In regurgitation score columns (MR,
 AR, TR, and PR), there are some missing values. If values were not
 available, cells were left blan,k and notes on why the value was not
 reported are in the "notes" column. #### File: Reports.zip
 **Description:** Individual a-ecg reports for each horse #### File:
 100_Horse_Master_Data_Sheet_7.14.25_for_Dryad.xlsx
 **Description:** Tabulated data from the ECG reports above with a key on
 the 2nd page for any codes used in data tabulation.