Interpretation and Treatment of Polysomnography Data

Principles of Polysomnography Interpretation

The American Academy of Sleep Medicine (AASM) recommends interpreting polysomnography according to standardized criteria, with attention to frontal EEG derivations for slow-wave sleep, in patients with suspected sleep disorders 1, 2
The AASM guidelines suggest calculating the apnea-hypopnea index (AHI) using recommended criteria for hypopneas, in patients with suspected obstructive sleep apnea 1, 2
The identification of micro-arousals and sleep fragmentation is crucial in the interpretation of polysomnography, according to the AASM guidelines 1
The measurement of oxygen desaturations and their severity is an important aspect of polysomnography interpretation, as recommended by the AASM 2
The evaluation of periodic limb movements is a key component of polysomnography interpretation, according to the AASM guidelines 3

The AASM recommends polysomnography for patients with suspected moderate to severe respiratory sleep disorders, such as obstructive sleep apnea 2, 4
Polysomnography is indicated for patients with suspected narcolepsy, as recommended by the AASM 3
The AASM suggests polysomnography for patients with violent or potentially dangerous behaviors during sleep, such as sleepwalking or sleep terrors 3
Polysomnography is recommended for patients with atypical or unusual parasomnias, according to the AASM guidelines 3
The AASM recommends polysomnography for patients with suspected sleep behavior disorders, such as REM sleep behavior disorder 3
Polysomnography is indicated for patients who have failed a home sleep test or have an inconclusive result, as recommended by the AASM 2, 4
The AASM suggests polysomnography for patients with significant comorbidities, such as cardiovascular or respiratory disease, muscle weakness, or hypoventilation 2, 4

The AASM recommends continuous positive airway pressure (CPAP) as first-line treatment for moderate to severe obstructive sleep apnea (AHI ≥ 15) 2, 4
For patients with mild obstructive sleep apnea (AHI 5-14), individualized treatment is recommended, based on symptoms and comorbidities, according to the AASM guidelines 2
The AASM suggests titration of CPAP during polysomnography to determine the optimal pressure for patients with obstructive sleep apnea 2, 4

The American Academy of Sleep Medicine recommends cognitive-behavioral therapy for insomnia (CBT-I) as first-line treatment for insomnia 5
The AASM suggests short-term pharmacotherapy, such as zolpidem or eszopiclone, for patients with insomnia who do not respond to CBT-I, with caution in older adults and those with cognitive impairment 6, 7

The AASM recommends phototherapy, tailored to the specific type of disorder, as treatment for circadian rhythm disorders 8
The AASM suggests melatonin, at specific doses and timing, as treatment for circadian rhythm disorders, according to the AASM guidelines 8
The AASM recommends combination therapy, including phototherapy and melatonin, for patients with refractory circadian rhythm disorders 8

The AASM recommends securing the sleep environment and clonazepam at bedtime as treatment for sleep behavior disorders, such as REM sleep behavior disorder 3
The AASM suggests melatonin as an alternative or complementary treatment for sleep behavior disorders, according to the AASM guidelines 3

The AASM recommends a split-night protocol (diagnostic followed by therapeutic) for patients with suspected sleep apnea, if clinically appropriate 2, 4
The AASM suggests a second polysomnography for patients with an initial negative study but strong clinical suspicion of a sleep disorder 2, 4
The AASM recommends careful attention to hypoventilation and central apneas in patients on chronic opioids, according to the AASM guidelines 2, 4
The AASM suggests specific interpretation criteria for children with respiratory sleep disorders, which may differ from adult criteria 9

The AASM warns that using different definitions for hypopneas can result in significant variations in AHI, highlighting the importance of standardized criteria 1
The AASM cautions that clinical questionnaires and predictive algorithms should not replace polysomnography or home sleep testing for diagnosis of obstructive sleep apnea 2, 4
The AASM recommends careful consideration of muscle weakness and neuromuscular disease in patients with suspected sleep disorders, as they may present with atypical symptoms or require specialized testing 10
The AASM warns that hypnotic medications can cause cognitive and behavioral disturbances, particularly in older adults, and should be used with caution 6, 7

When polysomnography shows absent N3 sleep, clinicians should prioritize identifying and treating the underlying cause rather than addressing the isolated finding; polysomnography is not required for routine insomnia diagnosis and treatment decisions must be based on clinical symptoms and daytime dysfunction. 11

Short‑term hypnotic pharmacotherapy (e.g., zolpidem or eszopiclone) may be used only after failure of cognitive‑behavioral therapy for insomnia, and must be prescribed with extreme caution in older adults because of heightened risks of cognitive and behavioral adverse effects. 11

The absent N3 finding should not be treated in isolation; if the patient lacks clinical symptoms or daytime impairment, no intervention is necessary. 11

After therapeutic interventions, clinicians should focus on clinical outcomes—such as improved daytime functioning, reduced sleepiness, and better quality of life—rather than expecting normalization of N3 sleep on repeat polysomnography. 11