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174 Section 3 Cardiovascular Disease

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Figure 17.11 Atrial enlargement is manifest as a P‐wave of
increased amplitude in a poodle with degenerative AV valve
disease and atrial enlargement. The blue arrow shows the tall P‐ Figure 17.12 ECG example of a left bundle branch block in a
wave (amplitude 0.6 mV) (50 mm/s; 10 mm/mV). rottweiler with dilated cardiomyopathy. The conduction
disturbance is identified by the prolongation of the QRS complex
(0.08 s; blue bar) but a normal MEA (50 mm/s; 10 mm/mV).
Further Reading

Fogoros RN. The electrophysiology study in the evaluation of Textbook of Canine and Feline Cardiology, 2nd edn.
supraventricular tachyarrhythmias. In: Electrophysiologic Philadelphia, PA: WB Saunders, 1999.
Testing, 3rd edn. Oxford: Blackwell Science, 1998. Moise NS, Gilmour RF Jr, Riccio ML, et al. Diagnosis
Kraus MS, Moise NS, Rishniw M. Morphology of of inherited ventricular tachycardia in German
ventricular tachycardia in the boxer and pace mapping shepherd dogs. J Am Vet Med Assoc 1997;
comparison. J Vet Intern Med 2002; 16: 153. 210(3): 403.
Meurs KM. Boxer dog cardiomyopathy: an update. Vet Oyama MA, Kraus MS, Gelzer AR, eds. Evaluation of the
Clin North Am Small Anim Pract 2004; 34: 1235. electrocardiogram. In: Rapid Review of ECG
Meurs KM, Spier AW, Wright NA, et al. Comparison of Interpretation in Small Animal Practice. Oxford: Taylor
the effects of four antiarrhythmic treatments for familial and Francis Group, 2014.
ventricular arrhythmias in Boxers. J Am Vet Med Assoc Tilley LP, Smith WK. Electrocardiography. In: Tilley LP,
2002; 221(4): 522. Smith WK, Oyama MA, Sleeper MM, eds. Manual of
Moise NS. Diagnosis and management of canine Canine and Feline Cardiology, 4th edn. St Louis, MO:
arrhythmias. In: Fox PR, Sisson D, Moise NS, eds. Saunders Elsevier, 2008.