Postoperative ICU patient on VC-SIMV with VT 500 mL, f 12, FiO2 0.50; ABG indicates severe hypoxemia; The therapist should increase

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Multiple Choice

Postoperative ICU patient on VC-SIMV with VT 500 mL, f 12, FiO2 0.50; ABG indicates severe hypoxemia; The therapist should increase

When a patient on mechanical ventilation has severe hypoxemia, the first action is to increase the fraction of inspired oxygen. This directly raises the amount of oxygen available for diffusion into the blood, improving arterial oxygen tension without changing the ventilator’s pressure or volume settings. In this postoperative ICU patient on VC-SIMV with an FiO2 of 0.50 and a severely low ABG, raising FiO2 to 0.60 targets the oxygenation deficit promptly while avoiding potential harms from increasing tidal volume (which raises airway pressures and risk of lung injury) or increasing rate (which mainly affects ventilation rather than oxygenation). Adjusting PEEP could help by recruiting alveoli, but it’s typically considered after optimizing FiO2. So, increasing FiO2 is the most appropriate immediate step to correct the hypoxemia.

When a patient on mechanical ventilation has severe hypoxemia, the first action is to increase the fraction of inspired oxygen. This directly raises the amount of oxygen available for diffusion into the blood, improving arterial oxygen tension without changing the ventilator’s pressure or volume settings. In this postoperative ICU patient on VC-SIMV with an FiO2 of 0.50 and a severely low ABG, raising FiO2 to 0.60 targets the oxygenation deficit promptly while avoiding potential harms from increasing tidal volume (which raises airway pressures and risk of lung injury) or increasing rate (which mainly affects ventilation rather than oxygenation). Adjusting PEEP could help by recruiting alveoli, but it’s typically considered after optimizing FiO2. So, increasing FiO2 is the most appropriate immediate step to correct the hypoxemia.

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