Gina Johnson
RERAs, or Respiratory Effort-Related Arousals, are a type of sleep disruption caused by irregular breathing. They are characterised by a decrease in nasal breathing for at least 10 seconds, followed by a spike in brain activity caused by a partial awakening. While they are scientifically validated as a sleep-breathing abnormality, they may not be recognised and considered for treatment depending on the healthcare provider and insurance carrier. The Respiratory Disturbance Index (RDI) is a metric that includes RERAs, but there is no consensus on whether it or the Apnea-Hypopnea Index (AHI) should be the standard index used to determine treatment.
| Characteristics | Values |
|---|---|
| Detection | RERAs can only be detected during an in-clinic sleep study that monitors breathing and brain activity. |
| Arousal | RERAs are arousals from sleep that do not meet the definitions of apneas or hypopneas but do disrupt breathing during sleep and cause respiratory symptoms that may cause an arousal. |
| Breathing reduction | Breathing reductions in RERAs are milder than with apneas or hypopneas. |
| Oxygen saturation | RERAs do not involve a drop in blood oxygen levels. |
| Treatment | Isolated or infrequent RERAs may not require treatment. Treatment may be needed when RERAs occur as part of OSA and when they cause significant sleep disruptions. |
| RDI | The respiratory disturbance index (RDI) is a formula used in reporting polysomnography (sleep study) findings. Unlike the AHI, it includes respiratory effort-related arousals (RERAs). |
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What You'll Learn
- RERA is an acronym for Respiratory Effort-Related Arousal
- RERAs are a scientifically validated sleep-breathing abnormality
- They are characterised by a drop in airflow through the nose
- They are detected by sensors during an in-clinic sleep study
- They are an indicator of the severity of sleep-related breathing disorders
RERA is an acronym for Respiratory Effort-Related Arousal
RERAs are detected during sleep studies, which monitor brain activity and breathing. Sensors used in a sleep study can show RERAs, which involve a drop in airflow through the nose followed by a spike in brain activity caused by a partial awakening. This is when the sensors measuring brain activity, called EEG, show that brain waves change to alpha waveforms. This means that a person has woken up, even if they don't realise it.
RERAs are considered a sleep-breathing abnormality that can negatively impact health. They are often associated with Upper Airway Resistance Syndrome (UARS), a subtype of Obstructive Sleep Apnea (OSA). However, they may or may not be recognised and considered for treatment, depending on the healthcare provider and insurance carrier.
The Respiratory Disturbance Index (RDI) is a metric that includes the number of apneas, hypopneas, and RERAs per hour of sleep. While RDI and AHI (Apnea-Hypopnea Index) are often used interchangeably, RDI includes RERAs, whereas AHI does not. There is currently no consensus among experts about which metric is most useful for assessing sleep apnea.
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RERAs are a scientifically validated sleep-breathing abnormality
RERAs, or Respiratory Effort-Related Arousals, are a scientifically validated sleep-breathing abnormality. They are characterised by a limitation in breathing that results in increased respiratory effort and culminates in a brief arousal or awakening. This is detected by sensors that show a change in brain waves to alpha wave form, indicating a partial awakening. This change in brain activity occurs in response to a drop in airflow through the nose, and it is this disruption that constitutes a RERA.
RERAs are similar to apneas and hypopneas in terms of pathophysiology and their complications. However, they do not meet the criteria for these disorders as they are not associated with a drop in blood oxygen levels. Despite this distinction, RERAs can still negatively impact health and cause significant sleep disruptions. They are often associated with Upper Airway Resistance Syndrome (UARS), a subtype of Obstructive Sleep Apnea (OSA).
The only dependable way to identify RERAs is through an overnight sleep study in a sleep lab. During this study, equipment tracks brain activity, sleep stages, and breathing. Sleep technicians can then detect apneas, hypopneas, and RERAs. However, not all sleep studies include a count of RERAs, and there is some debate about whether they should be included in the Respiratory Distress Index (RDI) or Apnea-Hypopnea Index (AHI) used to assess the severity of sleep apnea.
The RDI includes the number of apneas, hypopneas, and RERAs per hour of sleep, while the AHI does not include RERAs. Medicare, for example, defines RDI as the average number of apneas and hypopneas and does not include RERAs. This lack of consensus on the inclusion of RERAs in standard indices can impact treatment, as some insurance carriers may not recognise RERAs as a valid indicator of disease severity.
In summary, RERAs are a scientifically validated sleep-breathing abnormality that can negatively impact health. They are characterised by a limitation in breathing resulting in increased respiratory effort and a brief arousal. While similar to apneas and hypopneas, RERAs are distinct in that they do not involve a drop in blood oxygen levels. The identification and treatment of RERAs can vary depending on the healthcare provider and insurance carrier involved.
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They are characterised by a drop in airflow through the nose
RERAs, or Respiratory Effort-Related Arousals, are a type of sleep disruption caused by irregular breathing. They are characterised by a drop in airflow through the nose, followed by a spike in brain activity caused by a partial awakening. This phenomenon is only detectable during an in-clinic sleep study that monitors breathing and brain activity.
During an RERA, breathing slows down, triggering a brief arousal so that normal breathing can resume. While sleepers usually do not remember these awakenings, the disruptions can disturb sleep cycles and worsen sleep quality. RERAs are similar to apneas and hypopneas in terms of pathophysiology and complications but do not meet the criteria for these conditions. Apneas are characterised by a complete cessation of breathing for at least 10 seconds, while hypopneas are partial reductions in breathing, with a 30% or greater decrease in airflow for at least 10 seconds.
RERAs are considered a subtype of Obstructive Sleep Apnea (OSA), also known as Upper Airway Resistance Syndrome (UARS). They are identified when there are 10 or more seconds of decreased nasal breathing immediately followed by an arousal from sleep. While apneas, hypopneas, and RERAs all indicate a slowing of breathing during sleep, RERAs are distinguished by the absence of a drop in blood oxygen levels.
The Respiratory Disturbance Index (RDI) is a metric used to assess the severity of sleep apnea, calculated as the combined total of apneas, hypopneas, and RERAs per hour of sleep. However, there is ongoing debate about whether the RDI should include RERAs, as some insurance carriers, such as Medicare, do not include them in their calculations. The Apnea-Hypopnea Index (AHI) is a similar calculation that does not take RERAs into account. Despite the debate, RERAs have been scientifically validated as a sleep-breathing abnormality that can negatively impact health.
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They are detected by sensors during an in-clinic sleep study
RERAs, or Respiratory Effort-Related Arousals, are a type of sleep disruption caused by irregular breathing. They are a breathing disorder characterised by obstructive upper airway airflow reduction, which does not meet the criteria of apnea or hypopnea. They are associated with increased respiratory effort that resolves with the appearance of arousals.
RERAs can only be detected by sensors during an in-clinic sleep study. This is because the equipment used in a sleep study can track various bodily functions, including brain activity, sleep stages, and breathing. With this data, a sleep technician can detect apneas, hypopneas, and RERAs. Sensors measure brain activity and show that brain waves change to alpha waveforms, indicating a partial awakening. This is accompanied by a drop in airflow through the nose, which can be detected by sensors.
The only way to dependably identify RERAs is to perform an overnight sleep study in a sleep lab. However, not all sleep studies include a count of RERAs, and in some labs, only apneas and hypopneas are considered when diagnosing sleep apnea. This is because there is no universal consensus on whether the AHI (Apnea-Hypopnea Index) or RDI (Respiratory Disturbance Index) should be the standard index used to determine treatment. The RDI includes RERAs, while the AHI does not.
RERAs are not the only type of sleep disruption caused by irregular breathing. They are similar to true obstructive apneas and hypopneas in terms of pathophysiology and their complications. However, they are milder in terms of breathing reductions. While apneas, hypopneas, and RERAs all indicate a slowing of breathing during sleep, RERAs do not involve a drop in blood oxygen levels.
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They are an indicator of the severity of sleep-related breathing disorders
RERAs, or Respiratory Effort-Related Arousals, are a type of sleep disruption caused by irregular breathing. They are characterised by a decrease in airflow through the nose, followed by a spike in brain activity, indicating a partial awakening. This is detected by sensors in a sleep study.
RERAs are similar to apneas and hypopneas in that they are all breathing abnormalities that can negatively impact health. However, RERAs are milder and do not involve a drop in blood oxygen levels. Apneas are when breathing stops for at least ten seconds, and hypopneas are partial reductions in breathing where airflow slows by 30% or more for at least ten seconds.
RERAs are an important indicator of the severity of sleep-related breathing disorders, specifically Obstructive Sleep Apnea (OSA). OSA is a subtype of Upper Airway Resistance Syndrome (UARS), which is characterised by hypercapnia and prolonged hypoxemia during sleep. Patients with UARS are considered to be at greater risk of developing or aggravating hypoventilation or hypoxemia during sleep.
The presence of RERAs can only be detected through an overnight sleep study in a sleep lab, where brain activity, sleep stages, and breathing are monitored. The Respiratory Disturbance Index (RDI) or Apnea-Hypopnea Index (AHI) is used to assess the severity of sleep apnea, with the RDI including RERAs in addition to apneas and hypopneas. However, there is currently no universal consensus on whether the AHI or RDI should be the standard index used to determine treatment, and not all sleep studies include a count of RERAs.
In summary, RERAs are an important consideration in the assessment and treatment of sleep-related breathing disorders, particularly OSA and UARS. They provide valuable insights into the severity of these disorders and can guide treatment approaches.
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Frequently asked questions
RERAs are respiratory effort-related arousals. They are a breathing disorder characterised by obstructive upper airway airflow reduction, associated with increased respiratory effort that resolves with the appearance of arousals.
RERAs can only be detected during an in-clinic sleep study that monitors breathing and brain activity. Sensors used in a sleep study can show RERAs, which involve a drop in airflow through the nose followed by a spike in brain activity caused by a partial awakening.
Isolated or infrequent RERAs may not require treatment. However, treatment may be needed when RERAs occur as part of OSA and when they cause significant sleep disruptions. One of the most common treatments involves using a continuous PAP (CPAP) or auto-adjusting PAP (APAP) device during sleep.
Apneas are when breathing stops for at least ten seconds while sleeping. Hypopneas are partial reductions in breathing where breathing slows by 30% or more for a period of at least ten seconds, leading to a brief awakening or a 3% drop in blood oxygen levels. RERAs are more mild than apneas or hypopneas and involve at least ten seconds of decreased nasal breathing immediately followed by an arousal from sleep.
