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Re: [IPk] pump interferences - air travel

Hi John,

That's a very old issue! It was solved at least 10 years ago, if I recall 
rightly (Ian Grant, you probably know for sure).

Yes, it's true that a few early adopters of insulin pump therapy had 
problems with air pressure change in-flight similar to the problems that 
might arise if one took a waterproof Animas pump more than 12 feet below the 
water's surface. The air issue was sorted out by the introduction of tiny 
air vents into the pump's casing so that there is a way for air to escape 
without water getting in necessarily - sort of a one-way exit, if you like.

Flying or mountain-climbing officially presents no risk of insulin 
overdelivery because of changes in air pressure. Any pump that works today 
is capable of self-regulating its internal air pressure.

Type 1 11+ years; MiniMed pumper 7.5 years; Animas pumper 1 year

----Original Message Follows----
From: John Neale <email @ redacted>
Reply-To: email @ redacted
To: email @ redacted
Subject: Re: [IPk] pump interferences
Date: Mon, 24 Jan 2005 16:21:57 +0100

>I didn't think there was a risk really in the ambulance but looking at all
>these electronic things on the shelves like the blood pressure machines and
>resucitation equip I just wondered.

It's good to be cautious; but also good to know where the real risks do 
actually lie...

One thing that frightens me is the massive drop in air pressure when flying. 
If you've got bubbles in your reservoir, a significant amount of insulin may 
get sucked out (and into you) while in the air, and you will be denied that 
insulin when you land. Does that make sense? Yet nowhere in the instruction 
manuals does it tell you to disconnect while the flight is ascending, and 
reconnecting when you reach altitude, and to disconnect on descent, and when 
you land, bolus till you see you insulin coming out, and then reconnect. Or 
am I being silly?

And I guess a change in air pressure due to a change in weather conditions 
might affect insulin delivery as well.

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