Characterization of the cardiac effects of acute subarachnoid hemorrhage in dogs

Stroke; a Journal of Cerebral Circulation
A M ElrifaiJ Brillman

Abstract

We know that significant cardiac involvement can occur in patients with acute intracranial hemorrhage, particularly in those with subarachnoid hemorrhage. These patients may present with electrocardiographic abnormalities that were previously thought to be benign. However, many die of cardiovascular sequelae, which suggests more serious cardiac problems. To characterize the cardiac, rhythmic, and myocardial disturbances that occur 2 to 4 hours after subarachnoid hemorrhage, we conducted an experimental study using autologous blood (7.9+/-0.3 mL) injected into the right frontal lobe and subarachnoid space in canines. Nine adult mongrel dogs were anesthetized with isoflurane and their rectal temperatures maintained at 37 degrees C. Electrocardiogram, heart rate, mean arterial pressure, mean pulmonary artery pressure, and intracranial pressure were continuously measured. Transesophageal echocardiography was performed to assess myocardial wall motion changes and aortic and pulmonary flow velocities before, immediately after, and 2 and 4 hours after intracranial hemorrhage. Blood samples were collected and analyzed for catecholamines and cardiac enzymes, and cardiac output was measured. Animals were killed at 2 to 4 hours after suba...Continue Reading

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