NREMT Updated EMT Exam Questions and Answers by abiha

The correct answer is C because this patient is showing signs of respiratory failure , including a respiratory rate of 8 (too slow) , shallow breathing , cyanosis , and altered mental status .

NREMT-aligned airway and breathing guidelines state that patients with inadequate respirations require positive pressure ventilation with a bag-valve mask (BVM) . Simply increasing oxygen or switching masks is not sufficient when the patient is not ventilating effectively.

Therefore, immediate BVM ventilation with high-flow oxygen is the appropriate first intervention to support oxygenation and ventilation.

An epidural hematoma classically presents with a “lucid interval” — a brief period of regained consciousness following head trauma, followed by rapid deterioration. This is due to arterial bleeding, often from the middle meningeal artery, leading to increasing intracranial pressure.

Signs include:

High blood pressure

Decreasing respiratory rate

Altered LOC or unresponsiveness

Subdural hemorrhages are slower venous bleeds, common in elderly patients. Subarachnoid hemorrhage often presents with " worst headache of life. " Intracerebral bleeds are less commonly linked to lucid intervals.

Perfusion refers to delivery of oxygen and nutrients to tissues. It depends on three essential components:

Patent airway: Ensures oxygen reaches lungs

Intact microcirculation: Capillary-level exchange must function

Sufficient blood volume: Maintains blood pressure and oxygen transport

Hypoxic drive relates to COPD physiology, not perfusion. High alveolar pressure (like from CPAP) may impede venous return, and a low ventilation-perfusion ratio means poor oxygenation efficiency, which negatively affects perfusion.

Given fall with head trauma and absent respirations, the most concerning cause is spinal injury, particularly a cervical spine fracture. A high cervical injury (C1–C4) can paralyze the diaphragm, leading to apnea despite a beating heart.

Brain herniation can also depress respirations but often presents with unequal pupils, posturing, and Cushing’s triad (not described here). Commotio cordis is sudden cardiac arrest from blunt chest trauma (not head). Open pneumothorax affects chest mechanics, not directly linked here.