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Respiratory abnormalities are relatively common in cats, who may suffer from a wide range of disease processes. An initial triage step in the management of a dyspnic cat is to determine whether the dyspnea is cardiogenic or due to extracardiac (primary pulmonary) disease. This task is in no way a simple one, as cats often have non-specific history and physical examination abnormalities.

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Echocardiography has emerged as the most valuable non-invasive tool for evaluation of cardiac structure, function, blood flow patterns, and has greatly diminished the need for diagnostic cardiac catheterizations and angiocardiography in many cases. Echocardiography is one tool for evaluation of the cardiac patient, but should be used in conjunction with other diagnostic tests including thoracic radiography and electrocardiography for a global assessment of the patient.

Although there are highly sophisticated and advanced diagnostic modalities in cardiology, the basic technique of a good cardiovascular examination is still an essential fundamental element of the cardiovascular workup. Other basic diagnostic modalities that are readily available in most practices include thoracic radiographs, electrocardiography, and blood pressure measurement.

Acquired heart diseases of dogs include chronic degenerative valvular diseases (endocardiosis), pericardial diseases, cardiac neoplasia, dilated cardiomyopathy (DCM), arrhythmogenic right ventricular cardiomyopathy (ARVC), pulmonary hypertension (PH), infective endocarditis, and heart rhythm disturbances, some of which represent primary electrical disorders and others that develop secondary to cardiac remodeling.

Anesthetizing a patient with cardiac disease requires a plan for the use of supportive measures to maintain adequate tissue perfusion. As in the case of left sided cardiac dysfunction patients, volume administration frequently is not an option to support blood pressure. In these cases, should a positive inotropic or pressor agent be indicated, the volume of the adjunctive agent required should be deducted from the volume of crystalloid administered to maintain a balanced hourly rate.