Polysomnography (PSG) is a study or test done while you’re fully asleep. Your doctor will observe you as you sleep, record data about your sleep patterns, and identify any sleep disorders
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Your doctor will measure the following during PSG to help chart your sleep cycles :
- Brain waves
- Skeletal muscle activity
- blood oxygen levels
- Heart rate
- Breathing rate
- Eye movement
PSG registers your body’s shifts between the two stages of sleep, which are rapid eye movement (REM) sleep, and non-rapid eye movement (non-REM) sleep. Non-REM sleep is divided into “light sleep” and “deep sleep” phases.
During REM sleep, your brain activity is high, but only your eyes and breathing muscles are active. This is the stage in which you dream. Non-REM sleep involves slower brain activity. A person without a sleep disorder will switch between non-REM and REM sleep about every 90 minutes, experiencing four to six sleep cycles per night.
Observing your sleep cycles, along with your body’s reactions to the changes in these cycles, can help identify disruptions in your sleep patterns.
Why Do I Need a Polysomnography?
Your doctor can use PSG to diagnose sleep disorders. It often evaluates for symptoms of sleep apnea, a disorder in which breathing constantly stops and restarts during sleep. The symptoms of sleep apnea include:
- Sleepiness during the day despite having rested
- Ongoing and loud snoring
- Periods of holding your breath during sleep, which are followed by gasps for air
- Frequent episodes of waking up during the night
- Restless sleep
Split Night Polysomnography About the Split-Night Study :
A split-night study is an overnight polysomnogram performed with a two-hour period of baseline sleep study recording, followed by a CPAP titration study if it is determined to be indicated by the presence of clinically significant sleep apnea. CPAP (Continuous Positive Airway Pressure) is a device utilized to treat obstructive sleep apnea. It consists of nasal mask, connected by tubing to an air compressor. The mask fits snugly over or under the nose, and the air compressor increases the pressure of the air you breathe in. In a CPAP titration study the pressure is gradually increased until a pressure is reached that results in the resolution of the sleep apnea. CPAP is the most effective treatment available for obstructive Sleep apnea
CPAP Titration
A CPAP titration study is a type of in-lab sleep study used to calibrate continuous positive airway pressure (CPAP) therapy.
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CPAP is a common treatment used to :
- manage sleep-related breathing disorders including obstructive sleep apnea
- central sleep apnea and hypoventilation and hypoxemia
Once you are diagnosed with one of these disorders, you may need a CPAP study before you can begin treatment.
BIPAP Titraion
BiPAP (also referred to as BPAP) stands for BilevelPositive Airway Pressure, and is very similar in function and design to a CPAP machine (continuouspositive airway pressure).
Similar to a CPAP machine, A BiPAP machine is a non-invasive form of therapy for patients suffering from sleep apnea.
BiPAP is sometimes used in :
- patients who have pulmonary (lung) issues
- like COPD
- difference in pressures helps to eliminate extra CO2 carbon dioxide gas from the body
Split Night – Manual CPAP Titration
A split-night study is an overnight polysomnogram performed with a two-hour period of baseline sleep study recording, followed by a CPAP titration study if it is determined to be indicated by the presence of clinically significant sleep apnea.
Split Night CPAP Titration Treatment :
- Patients spent two consecutive nights in our laboratory with complete polysomnography.
- On the first night, we applied a split-night protocol; the first half of the night was used as a baseline (B), and after a diagnosis was made, CPAP was applied during the second half of the night (SN).
- On the second night (2N), patients spent the entire night on CPAP to confirm the effectiveness of CPAP treatment.
Once you are diagnosed with one of these disorders, you may need a CPAP study before you can begin treatment.
