Which of the following methods can eliminate the need for conducting a separate sleep study to adjust a patient's CPAP level?

1. Use an auto-adjusting CPAP system.
2. Use SpO2 values to titrate the CPAP level.
3. Use a patient sleep log or diary.
a. 1 and 2 only
b. 2 and 3 only
c. 1 and 3 only
d. 1, 2, and 3

ANS: A
Recently, CPAP units have been developed that automatically adjust the airway pressure in re-sponse to apnea, hypopnea, airflow limitation, or snoring. This auto-CPAP may result in lower effective pressures and better patient compliance, while eliminating the need for sleep-study ti-tration. Alternatively, CPAP may be titrated against pulse oximetry data (Figure 56-10). In this case, the goal is to use the lowest CPAP pressure that will prevent arterial desaturation (SpO2 < 90%).