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A 20-mm S wave in lead V1 and a 25-mm R wave in lead V6 are noted on a patient's 12-lead electrocardiogram. This would indicate which of the following? A. Right bundle branch block (RBBB) B. Left ventricular hypertrophy C. Posterior wall myocardial infarction (MI) D. Right ventricular hypertrophyB. Left ventricular hypertrophy When the depth of the S wave in lead V1 or V2 plus the height of the R wave in lead V5 or V6 is 35 mm or greater, this constitutes voltage criteria for left ventricular hypertrophy. A 22-year-old man is admitted after a bicycle collision with a tree. He has a contusion on the right side of his head. An intraventricular catheter has been inserted via a burr hole to monitor his intracranial pressure (ICP). He develops respiratory depression and is intubated and mechanically ventilated. Which of the following is the most likely cause of an increase in ICP at this time?