A nurse is caring for a 88-year-old male client admitted to the intensive care unit. After initial fluid resuscitation, the patient's MAP remains at 60 mmHg. What is the next appropriate intervention?

Choice A rationale: Mechanical ventilation supports oxygenation but does not address persistent hypotension; perfusion must be stabilized first before considering advanced airway interventions. Choice B rationale: Norepinephrine is the first-line vasopressor in septic shock when fluids fail, increasing vascular tone and MAP to restore adequate tissue perfusion. Choice C rationale: Corticosteroids may be used in refractory septic shock but are not first-line; vasopressors must be initiated before considering adjunctive therapy. Choice D rationale: Continuing fluid boluses risks fluid overload without improving MAP; vasopressors are indicated when adequate resuscitation fails to correct hypotension.