Split-Night Polysomnography (Titration Study)

Medical referral required

Titration with Continuous Positive Airway Pressure (CPAP) is commonly done during the same night as a diagnostic polysomnogram (PSG) to save waiting time, minimize cost to the patient, and treat sleep apnea as soon as possible. Early treatment may reduce cardiovascular complications of sleep apnea. In brief, the technician will gradually increase CPAP pressure (pressurized room air, not oxygen), delivered through the soft mask, to the level that eliminates most or all episodes of cessation of breathing. This level of CPAP pressure will be prescribed for home therapy.

The patient often begins the night on a low pressure of his CPAP or bilevel. As the person goes to sleep, he will be monitored for disruptions in his breathing. Any hypopneas, apneic events, or snoring will prompt the sleep technician to adjust the pressure of their CPAP machine remotely. Again, the person will be monitored at this higher pressure. The goal is to minimize apnea and hypopnea events and eliminate snoring.

It is also ideal for the patient to be titrated to an effective pressure supine (on their back) and during periods of rapid eye movement (REM) sleep. These two conditions will often lead to worsened sleep apnea, so an effective pressure in these conditions would be most favorable. Often towards the end of this study, the pressures may be increased even farther. This will allow the reviewing respirologist to make comparisons among the various pressures and may reveal changes that need to be made in the pressures for the most effective management of the personís sleep apnea.


Pointe-Claire (SouthWest One Complex across Lakeshore General Hospital)175 Stillview, Local 128, Pointe-Claire, QC H9R 4S5

Hours of Operation

Monday-Friday 8:00am- 5:00pm
Evenings for Testing: 8:00pm-8:00am
Weekends always available for testing upon request
Tel.: (514) 695-4848
Fax: (514) 695-4308