Respiratory disturbance index: Difference between revisions
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The '''respiratory disturbance index''' (RDI) — or '''respiratory distress Index''' — is a formula used in reporting [[polysomnography]] (sleep study) findings. Like the [[apnea-hypopnea index]] (AHI), it reports on respiratory events during sleep, but unlike the AHI, it also includes [[respiratory-effort related arousal]]s (RERAs).<ref>Richardson, Mark A., & Friedman, Norman R. (Eds.) (2007). ''Clinician's Guide to Pediatric Sleep Disorders'', p. 75. New York: Informa Healthcare USA, Inc.</ref> RERAs are arousals from [[sleep]] that do not technically meet the definitions of [[apnea]]s or [[hypopnea]]s, but do disrupt sleep. They are abrupt transitions from a deeper stage of sleep to a shallower. |
The '''respiratory disturbance index''' (RDI) — or '''respiratory distress Index''' — is a formula used in reporting [[polysomnography]] (sleep study) findings. Like the [[apnea-hypopnea index]] (AHI), it reports on respiratory events during sleep, but unlike the AHI, it also includes [[respiratory-effort related arousal]]s (RERAs).<ref>Richardson, Mark A., & Friedman, Norman R. (Eds.) (2007). ''Clinician's Guide to Pediatric Sleep Disorders'', p. 75. New York: Informa Healthcare USA, Inc.</ref> RERAs are arousals from [[sleep]] that do not technically meet the definitions of [[apnea]]s or [[hypopnea]]s, but do disrupt sleep. They are abrupt transitions from a deeper stage of sleep to a shallower. |
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A RERA is characterized by increasing respiratory effort (and thus decreasing esophageal pressures) for 10 seconds or more leading to an arousal from sleep, but one that does not fulfill the criteria for a hypopnea or apnea.<ref>http://www.clevelandclinicmeded.com/medicalpubs/diseasemanagement/pulmonary/sleep-disordered-breathing/Default.htm</ref> The [[gold standard]] for measuring RERAs is [[esophageal manometry]], as recommended by the [[American Academy of Sleep Medicine]] (AASM). However, esophageal manometry is uncomfortable for patients and impractical to use in most [[sleep center]]s. |
A RERA is characterized by increasing respiratory effort (and thus decreasing esophageal pressures) for 10 seconds or more leading to an arousal from sleep, but one that does not fulfill the criteria for a hypopnea or apnea.<ref>{{cite web|url=http://www.clevelandclinicmeded.com/medicalpubs/diseasemanagement/pulmonary/sleep-disordered-breathing/Default.htm|title=Sleep-Disordered Breathing|work=clevelandclinicmeded.com}}</ref> The [[gold standard]] for measuring RERAs is [[esophageal manometry]], as recommended by the [[American Academy of Sleep Medicine]] (AASM). However, esophageal manometry is uncomfortable for patients and impractical to use in most [[sleep center]]s. |
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Some research studies have found that a high RDI was significantly [[correlation|correlated]] with [[excessive daytime sleepiness]], and that this correlation was stronger than that for the frequency of [[oxygen saturation]] decreases below 85%, but other studies have found only a weak correlation.<ref>[http://books.google.com/books?id=T9fwv3B33voC&pg=PA83 Verster, Joris C., et al. (Eds.) (2008). ''Sleep and Quality of Life in Clinical Medicine'', p. 83. Totowa, New Jersey: Humana Press.]</ref> |
Some research studies have found that a high RDI was significantly [[correlation|correlated]] with [[excessive daytime sleepiness]], and that this correlation was stronger than that for the frequency of [[oxygen saturation]] decreases below 85%, but other studies have found only a weak correlation.<ref>[http://books.google.com/books?id=T9fwv3B33voC&pg=PA83 Verster, Joris C., et al. (Eds.) (2008). ''Sleep and Quality of Life in Clinical Medicine'', p. 83. Totowa, New Jersey: Humana Press.]</ref> |
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Revision as of 17:52, 18 October 2015
The respiratory disturbance index (RDI) — or respiratory distress Index — is a formula used in reporting polysomnography (sleep study) findings. Like the apnea-hypopnea index (AHI), it reports on respiratory events during sleep, but unlike the AHI, it also includes respiratory-effort related arousals (RERAs).[1] RERAs are arousals from sleep that do not technically meet the definitions of apneas or hypopneas, but do disrupt sleep. They are abrupt transitions from a deeper stage of sleep to a shallower.
A RERA is characterized by increasing respiratory effort (and thus decreasing esophageal pressures) for 10 seconds or more leading to an arousal from sleep, but one that does not fulfill the criteria for a hypopnea or apnea.[2] The gold standard for measuring RERAs is esophageal manometry, as recommended by the American Academy of Sleep Medicine (AASM). However, esophageal manometry is uncomfortable for patients and impractical to use in most sleep centers.
Some research studies have found that a high RDI was significantly correlated with excessive daytime sleepiness, and that this correlation was stronger than that for the frequency of oxygen saturation decreases below 85%, but other studies have found only a weak correlation.[3]
Formula
RDI = (RERAs + Hypopneas + apneas) X 60 / TST (in minutes). That is, RDI means the average number of episodes of apnea, hypopnea, and respiratory event-related arousal per hour of sleep.[4] (TST is "total sleep time".)
See also
References
- ^ Richardson, Mark A., & Friedman, Norman R. (Eds.) (2007). Clinician's Guide to Pediatric Sleep Disorders, p. 75. New York: Informa Healthcare USA, Inc.
- ^ "Sleep-Disordered Breathing". clevelandclinicmeded.com.
- ^ Verster, Joris C., et al. (Eds.) (2008). Sleep and Quality of Life in Clinical Medicine, p. 83. Totowa, New Jersey: Humana Press.
- ^ Espiritu, Joseph Roland D. (2008). "Sleep-Related Breathing Disorders". In Schmitz, Paul G. (Ed.), Internal Medicine: Just the Facts, p. 663. McGraw-Hill Medical.
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