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Select the statement below that best describes cardiac afterload:*A. It's the volume amount that fills the ventricles at the end of diastole.B. It's the volume the ventricles must work against to pump blood out of the body.C. It's the amount of blood the left ventricle pumps per beat.D. It's the pressure the ventricles must work against to open the semilunar valves so blood can be pumped out of the heart

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Unlike a cerebral concussion, a cerebral contusion is:A. A type of diffuse axonal injury that often leads to permanent neurologic damageB. Typically not associated with retrograde amnesia or focal neurologic deficitsC. A diffuse brain injury that results in sever intracranial hemorrhage and pressureD. Associated with physical brain damage and more pronounced neurologic deficits

A male patient with a closed head injury opens his eyes in response to pain, makes incomprehensible sounds, and responds to pain with flexion of his arms. His Glasgow Coma Scale score is __, and the MOST appropriate treatment for him involves:A. 6, intubation hyperventilation at a rate of 20 breaths/min, two large-bore IV lines running wide open, keeping him warm, and maintaining his oxygen saturation at greater than 90%B. 7, intubation, ventilations performed at a rate of 12 breaths/min, IV fluids as needed to maintain a systolic blood pressure of at least 90mmHG, and maintaining his oxygen saturation at greater than 90%C. 9, high-flow oxygen via nonrebreathing mask, IV fluids as needed to maintain a systolic blood pressure of at least 100mmHg, monitoring his oxygen saturation, and administering 1.5 mg/kg of lidocaine to decrease intracranial pressureD. 8, ventilation assistance with a bag-mask device, a 2 L bolus of normal saline or lactated ringer solution, elevating his head 12inches, and hyperventilating him if his heart rate falls below 60 beats/min

When an unrestrained passenger's head strikes the windshield of a motor vehicle following rapid deceleration:A. Compression injuries occur to the anterior portion of the brain, and stretching or tearing injuries occur to the posterior portion of the brainB. The anterior portion of the brain sustains stretching or tearing injuries, and the posterior portion of the brain sustains compression injuriesC. The brain initially strikes the rear of the skull, resulting in direct bruising, and then rebounds and strikes the front part of the skullD. The head falls back against the headrest or seat and the brain collides with the rear of the skull resulting in direct injury to the occipital lobe

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