Tuesday, September 8, 2020

Test Results of Sleep Apnea – Understanding the Sleep Apnea Test Results

The oxygen desaturation levels and apnea hypopnea index abbreviated as AHI are utilized to reference the graveness of OSA.


What is Apnea/Hypopnea Index?

The number of hypopneas/apneas that are recorded throughout per hour analysis of your sleep pattern is known as Apnea/Hypopnea Index or AHI. Normally it is identified as per hour number of episodes. The graveness of obstructive sleep apnea base on AHI is classified as below:

§  Severe OSA if AHI is greater or equal to 30 events every hour
§  Moderate OSA if AHI is greater or equal to 15 events but less than 30 every hour
§  Mild OSA if AHI is greater or equal to 5 but less than 15 events every hour
§  No or Minimal OSA if AHI is less than 5 events every hour

At times, the therapists use RDI (Respiratory Disturbance index). This may lead to confusion as the Respiratory Disturbance Index comprises more minute breathing issues along with hypopneas and apneas. So, there is a possibility that the patient’s RDI can elevate from his/her AHI.
Desaturation of Oxygen

Desaturation of oxygen (reduction of oxygen in blood) is traced during limited channel monitoring or polysomnography. Normal oxygen saturation in blood is 96 to 97% at sea level; however, we find no accepted classification in general for measuring the severe desaturation of oxygen in blood. The reduction of oxygen in blood less than 80% is considered severe, in between 80 to 89% is considered as moderate, while above 90% is normally considered as mild.


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