A 12-year-old 23.6-kg (51.9-lb) spayed female Labrador Retriever underwent cardiac evaluation following detection of ECG abnormalities while the dog was receiving chemotherapy for T-cell lymphoma (large cell lymphoma that was in remission at the time of the evaluation). The dog had undergone splenectomy because of suspected splenic hemangiosarcoma approximately 2 weeks prior to the consultation; the diagnosis was later confirmed. After surgery, the dog was monitored with telemetry and no arrhythmias were reported. The dog had received vincristine, cyclophosphamide, lomustine, l-asparaginase, and methotrexate prior to the cardiac evaluation. As part of a standard chemotherapy protocol, ECG was performed
A 10-year-old 28.0-kg (61.6-lb) spayed female Golden Retriever was evaluated because of a 2-day history of lethargy and anorexia. The dog also had a history of hypothyroidism and idiopathic epilepsy, for which it was receiving levothyroxine and phenobarbital, respectively. In addition, approximately 2 weeks before the examination, forelimb lameness had developed and resolved spontaneously.
On examination, the dog was lethargic and tachypneic (60 breaths/min; reference range, 16 to 40 breaths/min) and had a rectal temperature of 39.4°C (102.9°F). Cardiac auscultation revealed an irregular heart rhythm with a heart rate of 80 beats/min (reference range, 60 to 140 beats/min) and
A 6-year-old 38.8-kg castrated male Rottweiler was presented to the University of Missouri Veterinary Health Center because of vomiting and labored breathing. The dog had a history of surgical mass removal from the ventral aspect of the neck 5 days before presentation and amputation of the right pelvic limb as a juvenile. On examination, the dog was dull but responsive. Rectal temperature was 37.5 °C, mucous membranes were pale, and capillary refill time was 2 seconds. The heart rate was 260 beats/min. A heart murmur was not appreciated, and heart sounds were decreased. Increased bronchovesicular sounds were present dorsally