A patient is scheduled for pulmonary function tests. The nurse realizes this diagnostic test will asses which of the following?
1. how well a patient will wean from a ventilator
2. respiratory muscle efficiency
3. degree of intrapulmonary shunting
4. amount of oxygen provided to the tissues
2
Rationale: Assessment of respiratory muscle efficiency is accomplished by pulmonary function tests and includes measurements of tidal volume, minute ventilation, alveolar ventilation, respiratory rate, and vital capacity. How well a patient will wean from a ventilator is done with the rapid shallow breathing index. The degree of pulmonary shunting measures the amount of blood that flows past alveoli without participating in gas exchange. The amount of oxygen provided to the tissues is measured with cardiac output, hemoglobin level, oxygen saturation, and pulmonary arterial oxygen level.
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