Objective—To determine the clinical usefulness of
cardiac event recording in evaluating dogs and cats
with unexplained syncope, episodic collapse, or intermittent
Animals—58 dogs and 2 cats.
Procedure—Medical records and electrocardiographic
rhythm strips obtained by cardiac event recordings
were reviewed. Cardiac rhythm data from the event
recordings were classified as diagnostic or nondiagnostic.
Diagnostic yield was calculated by dividing the
number of animals for which cardiac event recording
was diagnostic by the total number of animals undergoing
cardiac event recording.
Results—For 51 animals, cardiac event recording was
classified as diagnostic; therefore, overall diagnostic
yield was 85%. Diagnostic yield was lower for animals
without underlying structural heart disease
(75.5%) than for animals with structural heart disease
(95.6%). A specific arrhythmia was identified as the
cause of clinical signs in 18 of the 51 (35%) animals
for which cardiac event recording was diagnostic.
Cardiac arrhythmia was definitively excluded as the
cause of clinical signs in the remaining 33 (65%) animals
in which cardiac event recording was diagnostic.
Conclusions and Clinical Relevance—Results indicate
that cardiac event recording had a high diagnostic
yield in dogs and cats examined because of unexplained
syncope, episodic collapse, or transient weakness
and ataxia, regardless of whether animals did or
did not have an underlying structural heart disease.
Diagnostic yield of cardiac event recording was higher
than that reported previously for Holter monitoring.
(J Am Vet Med Assoc 2000;216:1110–1114)