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3 Copyright © 2014 Elsevier Inc. All rights reserved. Figure 10-2 Electrocardiographic (ECG) changes can precede pathologic arrhythmias in patients with severe neurologic injuries. A, Prolongation of the QT interval is common after subarachnoid hemorrhage. Electrolyte abnormalities or medications can also prolong the QT interval. B, Torsades de pointes is a polymorphic ventricular tachycardia associated with QT prolongation. (Courtesy of Dr. Byron Lee, MD.)