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Proteinuria in patients with sleep apnea
B A Chaudhary1, O U Rehman, T M Brown
1Georgia Sleep Center, Medical College of Georgia, Augusta 30912-3137.
The Journal of Family Practice
|February 1, 1995
Summary
Severe proteinuria in obstructive sleep apnea (OSA) is linked to a higher apnea-hypopnea index (AHI). However, lesser proteinuria degrees may involve other factors beyond AHI, warranting further research.
Area of Science:
- Nephrology
- Sleep Medicine
- Cardiovascular Research
Background:
- Proteinuria, particularly nephrotic-range, is occasionally observed in patients with obstructive sleep apnea (OSA).
- The specific factors correlating with proteinuria severity in OSA patients remain unclear.
- This research investigates the relationship between proteinuria severity and the number of apneas in OSA patients.
Purpose of the Study:
- To determine if the severity of proteinuria in obstructive sleep apnea (OSA) patients correlates with their apnea-hypopnea index (AHI).
Main Methods:
- Proteinuria levels were assessed using the dipstick method in 407 diagnosed OSA patients.
- The apnea-hypopnea index (AHI) was calculated for each patient via overnight polysomnography.
- Sleep apnea was defined by at least 30 apneas and an AHI exceeding 15 during monitoring.
Main Results:
- The AHI was comparable between patients with no proteinuria and those with mild to moderate proteinuria (1+ to 3+).
- A significantly higher AHI was observed exclusively in the 9 patients exhibiting severe proteinuria (4+).
Conclusions:
- Severe proteinuria in OSA patients is associated with a higher frequency of sleep apneas.
- The apnea-hypopnea index alone does not fully explain milder degrees of proteinuria.
- Additional factors, such as hypoxemia, require further investigation to understand proteinuria severity in OSA.