Wednesday
Sep122012

Blood Pressure and Sleep Apnoea

In this post I mentioned that my parents also have sleep apnoea and that my mother was going to have a CPAP trial.

During her trial we noticed something interesting...

Normally she takes medication to reduce her blood pressure, which has improved in recent years but still remains above normal.

On the mornings that she'd been using CPAP for the majority of the night, her blood pressure was lower, in fact it had dropped to a level where medication wasn't necessary.

She took three readings every morning from which we calculated a mean daily morning value. She did this for four nights before using CPAP and for four nights using CPAP.

The results are clear...

 

 

 

I've marked the limits for Hypertension as horizontal lines on the graph. Prior to CPAP my mum had systolic hypertension and borderline diastolic hypertension. Using CPAP she had neither and her blood pressure remained normal even until bedtime.

I would like to explore futher to see if there were any other factors that may have caused this, but just as when I began getting used to CPAP I felt it best to keep things simple and stress free, daily diet and other factors such as bedtimes were not monitored or compared.

My mum quickly got used to CPAP, but due to the fact that she sleeps prone, wasn't able to find a position that didn't cause the mask to dig into the side of her face in the night. 

We tried a few different masks, including the CPAP pro. Which she preferred over the Resmed Swift FX pillows because she grinds her teeth in the night (bruxism) and found that the moulded mouthpiece of the CPAP Pro prevented this, but ultimately she decided not to carry on with CPAP for the time being, although she said that the door remains open for the future should she feel the need. She also noted that on a couple of the CPAP nights her bedtime was later than usual due to her not feeling as tired.

It's hard to imagine the pressure that poor sleep, oxygen deprevation, high CO2 and the strain of apnoeas puts on the system, especially when it seems so normal to sleep this way every night but it becomes clearer to see when you have ways of quantifying it such as AHI and blood pressure.

That said, I've read about many people who are hypertensive and CPAP does not reduce their blood pressure. It could be that their hypertension is caused by other factors or maybe even that years of strain on the body through sleep apnoea has caused irreversible damage; I am not qualified to say, I can only speculate.

 

Additional Reading

Treatment of Obstructive Sleep Apnea with CPAP May Lower Blood Pressure 
http://www-archive.thoracic.org/sections/publications/press-releases/conference/articles/2008/abstracts-and-press-releases/barbe-cpap-blood-pressure.pdf

 

 

PrintView Printer Friendly Version

EmailEmail Article to Friend

References (9)

References allow you to track sources for this article, as well as articles that were written in response to this article.

Reader Comments (2)

Excellent blog very nice and unique information related to Blood Pressure. Thanks for sharing this information.

October 9, 2012 | Unregistered CommenterBlood Pressure Medicines
interesting blog .. nice informations ..
my regards
October 1, 2013 | Unregistered Commenterlitmann cardiology

PostPost a New Comment

Enter your information below to add a new comment.

My response is on my own website »
Author Email (optional):
Author URL (optional):
Post:
 
All HTML will be escaped. Hyperlinks will be created for URLs automatically.
« Wild Camping with CPAP | Main | Travelling With CPAP / BiPAP »