Pathophysiology of Circulatory Failure Circulatory failure, or the inability of the heart to provide sufficient cardiac output to sat­isfy tissue metabolic requirements, is the most important and most common cause of altered pharmacokinetics during cardiac emergencies. Circulatory failure may result from decreased myocardial contractility, arrhythmias that allow insufficient time for diastolic filling or impair atrioventricular [...]

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