A patient being ventilated mechanically develops respiratory alkalosis. The high-pressure alarm has sounded frequently for this patient. The nurse knows this is a common problem in patients with which ventilator settings?
1. Assist-control mode
2. SIMV mode with the set rate too low
3. Pressure-support mode
4. Pressure-control mode
1
Rationale 1: A frequent problem with assist-control mode is patient-ventilator asynchrony and the possibility of respiratory alkalosis.
Rationale 2: If the SIMV rate is too low, the patient may become hypoxic and acidotic. If the rate is set too high, the patient may develop respiratory alkalosis.
Rationale 3: Hypoventilation is a more common problem with pressure-support mode.
Rationale 4: Respiratory acidosis is a more common problem with pressure-control mode.
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