Clinical Overview, Education, and Patient Support · 4 min read
Patient Information and Clinical Assessment
Patient Documentation Requirements
Before initiating any polysomnographic study, the technologist must collect and verify all required documentation. This process ensures patient safety, study validity, and regulatory compliance.
Physician Orders and Referrals
A valid physician order must be present before conducting any sleep study. The order should specify the type of study requested, such as diagnostic polysomnography, split-night study, CPAP titration, bilevel PAP titration, or multiple sleep latency test. The technologist must verify that the ordering physician is authorized to request sleep studies and that the order is current and complete. Orders typically remain valid for a specified period, often 30 to 90 days depending on facility policy.
Patient History and Questionnaires
Sleep history questionnaires provide essential information about the patient's sleep complaints, sleep schedule, and symptoms. Common validated instruments include the Epworth Sleepiness Scale, which measures daytime sleepiness on a scale of 0 to 24, with scores above 10 indicating excessive daytime sleepiness. The Pittsburgh Sleep Quality Index assesses sleep quality over the previous month. The STOP-BANG questionnaire screens for obstructive sleep apnea risk factors including snoring, tiredness, observed apneas, high blood pressure, BMI above 35, age over 50, neck circumference greater than 40 centimeters, and male gender.
| Tool | What it measures | Scoring |
|---|---|---|
| Epworth Sleepiness Scale (ESS) | Chance of dozing in 8 everyday situations | Each item 0–3; total 0–24; above 10 suggests excessive daytime sleepiness |
| STOP-Bang | Risk of obstructive sleep apnea | 8 yes/no items; 0–2 low, 3–4 intermediate, 5–8 high risk |
| Sleep diary / sleep log | Bedtimes, wake times, naps, caffeine and alcohol over 1–2 weeks | Reviewed for patterns (insufficient sleep, circadian timing) |
| Pre- and post-PSG questionnaires | Usual sleep vs. the night in the lab | Shows whether the study night was typical for the patient |
Medical History Review
The technologist must review the patient's medical history for conditions that affect sleep study performance or interpretation. Cardiac conditions such as atrial fibrillation, heart failure, and pacemaker presence require specific attention. Respiratory conditions including COPD, asthma, and restrictive lung disease influence oxygen supplementation decisions. Neurological conditions such as epilepsy, stroke, and neuromuscular disorders affect EEG interpretation and patient safety. Psychiatric conditions and current medications, especially sedatives, stimulants, and respiratory depressants, must be documented.
Medication List Verification
A complete medication list is essential for study interpretation. Medications affecting sleep architecture include benzodiazepines, which suppress REM sleep and slow-wave sleep. Antidepressants, particularly SSRIs and SNRIs, suppress REM sleep and may cause REM sleep behavior disorder. Beta-blockers can suppress melatonin production and disrupt sleep continuity. Opioids cause central apneas and oxygen desaturation. The technologist should document the time of last dose for all relevant medications.
Consent Forms and HIPAA Authorization
Written informed consent must be obtained before the study. The consent should explain the nature of the study, potential risks including skin irritation from electrodes and sleep disruption, and the patient's right to discontinue participation. HIPAA authorization for release of protected health information to the referring physician and insurance company must be signed and dated.
Insurance Verification and Prior Authorization
Many facilities require verification of insurance coverage and prior authorization before conducting sleep studies. The technologist should confirm that required documentation for medical necessity has been submitted and approved.
Pre-Study Assessment
Physical Assessment
Upon patient arrival, the technologist performs a focused physical assessment. This includes vital signs measurement including blood pressure, heart rate, respiratory rate, and oxygen saturation on room air. Height and weight are measured to calculate BMI. Neck circumference is measured at the level of the cricothyroid membrane. The technologist assesses the oropharynx using the Mallampati classification, which grades airway visibility from Class I (full visibility of soft palate, uvula, and tonsillar pillars) to Class IV (only hard palate visible).
Sleep Diary Review
If the patient has maintained a sleep diary, the technologist reviews recent sleep patterns including bedtime, wake time, sleep latency, number of awakenings, nap timing and duration, caffeine and alcohol consumption, and medication use. This information helps interpret study findings and identify factors that may affect the study night.
Screening for Contraindications
The technologist screens for conditions that may contraindicate the study or require modification. Active respiratory infections may warrant postponement. Unstable cardiac conditions require physician consultation. Skin conditions at electrode sites may require alternative placement. Severe claustrophobia may affect mask tolerance during titration studies.
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