Document Detail

Diagnosis and treatment of cardiac arrhythmias.
MedLine Citation:
PMID:  3878194     Owner:  NLM     Status:  MEDLINE    
Cardiac arrhythmias are probably more common in horses than in any other domestic animal species. The most frequent clinical complaint associated with cardiac arrhythmias is exercise intolerance. Physical examination is characterized by auscultation abnormalities such as fast or slow heart rate, irregular rhythm, extra sounds, long pauses, or abnormal heart sounds. The electrocardiogram is used to make a definitive diagnosis of the dysrhythmia. Other laboratory and cardiac function tests are employed to determine the etiology and to assess the significance of the arrhythmia. Antiarrhythmic therapy is given when clinical signs specifically related to the arrhythmia are present, when hemodynamic parameters are compromised by the arrhythmia, or when the ECG reveals abnormalities that put the patient at risk for development of more severe arrhythmias. The cardiovascular drugs most frequently used are digoxin and quinidine. Digoxin is most commonly used for supraventricular arrhythmias, especially arrhythmias characterized by fast heart rates. Quinidine is very effective for short-term treatment of ventricular and supraventricular arrhythmias but must be used with caution because of the potential for toxic side effects. The cardiac arrhythmias due to vagal tone (sinus arrhythmia, sinus block, sinus arrest, sinus bradycardia, wandering pacemaker, first-degree AV block, and second-degree AV block) that are found in resting horses are generally considered to be normal and generally do not require therapy.
S M McGuirk; W W Muir
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Veterinary clinics of North America. Equine practice     Volume:  1     ISSN:  0749-0739     ISO Abbreviation:  Vet. Clin. North Am. Equine Pract.     Publication Date:  1985 Aug 
Date Detail:
Created Date:  1986-02-14     Completed Date:  1986-02-14     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8511904     Medline TA:  Vet Clin North Am Equine Pract     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  353-70     Citation Subset:  IM    
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MeSH Terms
Arrhythmias, Cardiac / diagnosis,  drug therapy,  veterinary*
Autonomic Agents / therapeutic use
Diagnosis, Differential
Digoxin / therapeutic use
Electrocardiography / veterinary
Heart Auscultation / instrumentation,  veterinary
Heart Rate
Heart Sounds
Horse Diseases / diagnosis*,  drug therapy
Laboratory Techniques and Procedures / veterinary
Physical Examination / methods,  veterinary
Quinidine / therapeutic use
Reg. No./Substance:
0/Autonomic Agents; 20830-75-5/Digoxin; 56-54-2/Quinidine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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