OBJECTIVE: To characterize the patterns associated with Lorenz plots (LPs) or Poincaré plots derived from the Holter recordings of dogs with various cardiac rhythms. ANIMALS: 77 dogs with 24-hour Holter recordings. PROCEDURES: A 1-hour period from the Holter recordings from each of 20 dogs without...

In humans, accessory pathways (APs) in an anteroseptal and midseptal position are often challenging to ablate because of their close proximity with the conduction pathways of the atrioventricular junction. The use of low-energy ablation techniques can be useful to reduce the risk of permanently...

Twenty dogs with chronic mitral valve disease were evaluated for the evidence of electrocardiographic variations. The changes recorded were atrial fibrillation, first degree atrioventricular block, second degree atrioventricular block, ventricular premature complex, sinus tachycardia, 'P' mitrale,...

An atrioventricular block (AV-block) is present when the normal conduction of an impulse generated in the sinoatrial node to the ventricular myocardium is disturbed. Three degrees of AV-block are distinguished: first degree is only a prolongation of the AV conduction, while the second- and third-...

A 14-year-old American Staffordshire terrier was presented for episodes of exercise-induced syncope. At admission, atrial flutter coupled to third-degree atrioventricular block was diagnosed electrocardiographically. On the second day of hospitalization, surface electrocardiogram revealed...

A 7-year-old female Dalmatian dog was admitted for clinical evaluation in Fortaleza, Brazil [date not given]. According to the owner, she had been apathetic for a year, had gained weight, always had a sad expression and her hair was generally brittle and opaque. On physical examination, skin...

Dexmedetomidine is a α-2 adrenergic agonist drug used in veterinary anesthesiology due to its sedative and analgesic properties. There are concerns about its side effects, especially cardiovascular, among them arrhythmias. These may compromise cardiac output and tissue perfusion. The arrhythmias...

The use of anesthetics has been associated with the occurrence of arrhythmias and cardiovascular complications. In this paper we report the case of a bitch carrying a Mobitz type II second-degree atrioventricular block (AVB) detected in the preoperative cardiac evaluation, which was submitted to...

Normal Holter reference intervals have not been established for dogs <1 year of age. This lack of Holter reference intervals inhibits the ability to screen puppies for early indicators of heart disease, especially in breeds that have inherited cardiac arrhythmias (e.g. German Shepherd Dogs) or a high incidence of arrhythmic heart disease (e.g. Boxer dogs). The objective of this project was to establish Holter minimum, average, and maximum heart rates and incidence of arrhythmias in clinically healthy dogs <1 year of age and to compare these results to previously reported Holter data for their adult counterparts. Forty-four client-owned clinically healthy puppies between 12 and 51 weeks of age were prospectively studied. Age was determined by date of birth and corroborated by dental examination. Puppies were deemed healthy based on history and physical examination. Puppies with heart murmurs underwent echocardiographic examination. Dogs...

A 16-year-old Nigerian indigenous dog was presented with history of weakness and coughing. On physical examination, respiratory Tate, pulse rate, rectal temperature, packed cell volume and haemoglobin values were within the normal ranges. However, electrolyte values showed hyperkalemia....