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The dissociative state attributed to ketamine anesthesia can be modified by the administration of a/an: 1. antiarrhythmic. 2. benzodiazepine. 3. antagonist. 4. anticonvulsant. - 2. benzodiazepine A patient complains of dyspnea and chest pain after the insertion of a central-line catheter. The patient's breath sounds are diminished. After physician notification, the priority nursing action is to: 1. prepare for the insertion of a chest tube. 2. obtain an order for analgesic. 3. apply a positive-pressure airway ventilator. 4. prepare for immediate removal of the central line. - 1. prepare for the insertion of a chest tube. A potential negative side effect of positive end-expiratory pressure (PEEP) is: 1. alveolar collapse. 2. decreased intrapulmonary shunting. 3. increased cardiac output. 4. hypertension. - 2. decreased intrapulmonary shunting.