A 36-year-old man is brought to the emergency department by emergency medical services after falling from a third-story scaffolding onto his back. On arrival, he is obtunded with a Glasgow Coma Scale score of 8. Vital signs show a heart rate of 126/min, blood pressure of 80/56 mm Hg, respiratory rate of 24/min, and temperature of 99.0°F. Physical examination reveals distended neck veins and distant heart sounds. A chest radiograph (Figure A) is obtained. All of the following interventions may improve this patient’s blood pressure EXCEPT: