Polysomnogram (PSG)

Polysomnography studies are conducted by trained sleep technologists and interpreted by physicians with expertise in sleep medicine.

Clinical Indications

Polysomnography is commonly indicated for the assessment of:

• Suspected obstructive or central sleep apnea
• Excessive daytime sleepiness of unclear etiology
• Parasomnias and abnormal nocturnal behaviors
• Periodic limb movement disorder
• Suspected narcolepsy or hypersomnia
• Unexplained nocturnal hypoxemia
• Evaluation of sleep-related breathing disorders in patients with cardiorespiratory or neuromuscular disease

Components Monitored

A standard polysomnography study may include monitoring of:

• Electroencephalography (EEG)
• Electrooculography (EOG)
• Electromyography (EMG)
• Respiratory effort and airflow
• Oxygen saturation
• Heart rate and rhythm
• Body position and limb movements

Procedure Overview

Polysomnography is typically performed overnight in a monitored sleep laboratory. Sensors are applied to the scalp, face, chest, and limbs to record physiologic signals while the patient sleeps in a controlled environment. The study is non-invasive and designed to minimize discomfort while ensuring accurate data collection.

Reporting and Interpretation

Sleep recordings are analyzed to evaluate sleep stages, respiratory events, oxygen desaturation, arousals, and movement activity. Results are interpreted in conjunction with the patient’s clinical history, and a detailed diagnostic report is provided to the referring clinician.