Clinical Definition

Desaturation Index represents:

  • Hypoxic Event Frequency: Number of oxygen drops per hour
  • Physiological Impact: Frequency of hypoxic stress
  • Severity Assessment: Indicates degree of sleep-disordered breathing
  • Treatment Monitoring: Should decrease with effective therapy
  • Risk Stratification: Higher values indicate greater cardiovascular risk

The desaturation index may use different threshold criteria (2%, 3%, or 4% drops) depending on the clinical context and scoring system used.

Etymology & History

Desaturation indices developed alongside pulse oximetry technology in the 1980s and became standard components of sleep study analysis as the importance of hypoxic events was recognized.

Reference Values & Interpretation

Normal Values

Normal Desaturation Index should be <5 events per hour, similar to ODI. Values <3/hour are considered excellent.

Abnormal Values

Desaturation Index ≥5/hour indicates significant sleep-disordered breathing. Values >15/hour suggest moderate to severe hypoxic stress requiring treatment.

How It's Measured

Desaturation Index is calculated by counting oxygen desaturation events meeting specific criteria (typically 2%, 3%, or 4% drops) and dividing by total sleep time.

Role in Diagnosis

Desaturation Index is used to assess the severity of sleep-disordered breathing and can help diagnose conditions causing frequent hypoxic events.

Role in Treatment

Desaturation Index is used to monitor treatment effectiveness. Successful therapy should significantly reduce the frequency of desaturation events.

Associated Conditions

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Clinical Guidelines

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Latest Research & Updates

AI-Updated Weekly

Recent research has investigated optimal desaturation thresholds for different patient populations and the relationship between desaturation frequency and cardiovascular outcomes.