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Observer agreement for detection of cardiac arrhythmias on telemetric ECG recordings obtained at rest, during and after exercise in 10 Warmblood horses.
Equine Vet J Suppl. 2010 NovEV

Abstract

REASONS FOR PERFORMING STUDY

Frequent supraventricular or ventricular arrhythmias during and after exercise are considered pathological in horses. Prevalence of arrhythmias seen in apparently healthy horses is still a matter of debate and may depend on breed, athletic condition and exercise intensity.

OBJECTIVES

To determine intra- and interobserver agreement for detection of arrhythmias at rest, during and after exercise using a telemetric electrocardiography device.

MATERIALS AND METHODS

The electrocardiogram (ECG) recordings of 10 healthy Warmblood horses (5 of which had an intracardiac catheter in place) undergoing a standardised treadmill exercise test were analysed at rest (R), during warm-up (W), during exercise (E), as well as during 0-5 min (PE(0-5)) and 6-45 min (PE(6-45)) recovery after exercise. The number and time of occurrence of physiological and pathological 'rhythm events' were recorded. Events were classified according to origin and mode of conduction. The agreement of 3 independent, blinded observers with different experience in ECG reading was estimated considering time of occurrence and classification of events.

RESULTS

For correct timing and classification, intraobserver agreement for observer 1 was 97% (R), 100% (W), 20% (E), 82% (PE(0-5)) and 100% (PE(6-45)). Interobserver agreement between observer 1 vs. observer 2 and between observer 1 vs. 3, respectively, was 96 and 92.6% (R), 83 and 31% (W), 0 and 13% (E), 23 and 18% (PE(0-5)), and 67 and 55% (PE(6-45)). When including the events with correct timing but disagreement for classification, the intraobserver agreement increased to 94% during PE(0-5) and the interobserver agreement reached 83 and 50% (W), 20 and 50% (E), 41 and 47% (PE(0-5)), and 83.5 and 65% (PE(6-45)). The interobserver agreement increased with observer experience.

CONCLUSIONS

Intra- and interobserver agreement for recognition and classification of events was good at R, but poor during E and poor-moderate during recovery periods. These results highlight the limitations of stress ECG in horses and the need for high-quality recordings and adequate observer training.

Authors+Show Affiliations

Equine Department, Vetsuisse Faculty, University of Zurich, Switzerland. dtrachsel@vetclinics.uzh.chNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21059008

Citation

Trachsel, D S., et al. "Observer Agreement for Detection of Cardiac Arrhythmias On Telemetric ECG Recordings Obtained at Rest, During and After Exercise in 10 Warmblood Horses." Equine Veterinary Journal. Supplement, 2010, pp. 208-15.
Trachsel DS, Bitschnau C, Waldern N, et al. Observer agreement for detection of cardiac arrhythmias on telemetric ECG recordings obtained at rest, during and after exercise in 10 Warmblood horses. Equine Vet J Suppl. 2010.
Trachsel, D. S., Bitschnau, C., Waldern, N., Weishaupt, M. A., & Schwarzwald, C. C. (2010). Observer agreement for detection of cardiac arrhythmias on telemetric ECG recordings obtained at rest, during and after exercise in 10 Warmblood horses. Equine Veterinary Journal. Supplement, (38), 208-15. https://doi.org/10.1111/j.2042-3306.2010.00172.x
Trachsel DS, et al. Observer Agreement for Detection of Cardiac Arrhythmias On Telemetric ECG Recordings Obtained at Rest, During and After Exercise in 10 Warmblood Horses. Equine Vet J Suppl. 2010;(38)208-15. PubMed PMID: 21059008.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Observer agreement for detection of cardiac arrhythmias on telemetric ECG recordings obtained at rest, during and after exercise in 10 Warmblood horses. AU - Trachsel,D S, AU - Bitschnau,C, AU - Waldern,N, AU - Weishaupt,M A, AU - Schwarzwald,C C, PY - 2010/11/10/entrez PY - 2011/5/27/pubmed PY - 2011/8/19/medline SP - 208 EP - 15 JF - Equine veterinary journal. Supplement JO - Equine Vet J Suppl IS - 38 N2 - REASONS FOR PERFORMING STUDY: Frequent supraventricular or ventricular arrhythmias during and after exercise are considered pathological in horses. Prevalence of arrhythmias seen in apparently healthy horses is still a matter of debate and may depend on breed, athletic condition and exercise intensity. OBJECTIVES: To determine intra- and interobserver agreement for detection of arrhythmias at rest, during and after exercise using a telemetric electrocardiography device. MATERIALS AND METHODS: The electrocardiogram (ECG) recordings of 10 healthy Warmblood horses (5 of which had an intracardiac catheter in place) undergoing a standardised treadmill exercise test were analysed at rest (R), during warm-up (W), during exercise (E), as well as during 0-5 min (PE(0-5)) and 6-45 min (PE(6-45)) recovery after exercise. The number and time of occurrence of physiological and pathological 'rhythm events' were recorded. Events were classified according to origin and mode of conduction. The agreement of 3 independent, blinded observers with different experience in ECG reading was estimated considering time of occurrence and classification of events. RESULTS: For correct timing and classification, intraobserver agreement for observer 1 was 97% (R), 100% (W), 20% (E), 82% (PE(0-5)) and 100% (PE(6-45)). Interobserver agreement between observer 1 vs. observer 2 and between observer 1 vs. 3, respectively, was 96 and 92.6% (R), 83 and 31% (W), 0 and 13% (E), 23 and 18% (PE(0-5)), and 67 and 55% (PE(6-45)). When including the events with correct timing but disagreement for classification, the intraobserver agreement increased to 94% during PE(0-5) and the interobserver agreement reached 83 and 50% (W), 20 and 50% (E), 41 and 47% (PE(0-5)), and 83.5 and 65% (PE(6-45)). The interobserver agreement increased with observer experience. CONCLUSIONS: Intra- and interobserver agreement for recognition and classification of events was good at R, but poor during E and poor-moderate during recovery periods. These results highlight the limitations of stress ECG in horses and the need for high-quality recordings and adequate observer training. UR - https://www.unboundmedicine.com/medline/citation/21059008/Observer_agreement_for_detection_of_cardiac_arrhythmias_on_telemetric_ECG_recordings_obtained_at_rest_during_and_after_exercise_in_10_Warmblood_horses_ DB - PRIME DP - Unbound Medicine ER -