Hysteresis

Ok so last month I posted a question about a setting called restasis. Well I was wrong... it was hysteresis. Maybe that will make much more sense and someone can explain what it does. I went back to the doctor yesterday and since the setting change I had four episodes of atrial tach or afib they were not sure which so they want to change my medicine again and add another beta blocker to try to slow down rate further. I still think they just don't know what to do for me! It is very frustrating!

4 Comments

Not Familiar with it, BUT...

by bchgirl - 2011-05-13 05:05:01

Well, I'm completely new to the whole PM thing. Just had mine implanted 10 days ago, but still at home recovering so have time on my hands. I found this website, and love the comments from other people. It helps to know others share the same concerns, worries, and just the commonalities. Somehow, it has given me peace of mind. At any rate, I found this article on Hysteresis which may be of some use to you. It talks in depth about it toward the bottom of page one. Hope it helps some. You may already know all about this part, but thought I would share anyway. Best wishes and feel better!

http://findarticles.com/p/articles/mi_qa3689/is_200410/ai_n9431368/

Message Continued

by SMITTY - 2011-05-13 05:05:44



The first line of my previous message was, maybe this will ,mean more to you than it does me. And I have no idea how I deleted it.

Hysteresis

by SMITTY - 2011-05-13 05:05:47

M
"Hysteresis, means a delay of effect behind the cause. In pacemakers, this means delaying pacing to maximize patient benefit. Let's look at when this feature would be used.

One problem with a single-chamber ventricular pacemaker is the loss of atrial kick, resulting in a 15% to 30% drop in cardiac output (CO). For example, if you compare the CO of a patient with ventricular pacing at 80 bpm to his CO at his own natural sinus rhythm of 80 bpm, you'd probably find that the CO is significantly higher with sinus rhythm because of the proper coordination between atrial and ventricular contractions. Even with a heart rate of 75 bpm, his CO would be higher than provided by a single-chamber ventricular pacemaker set at 80 bpm because what's lost in heart rate is made up in stroke volume."

Smitty

Thanks

by nat36 - 2011-05-13 10:05:04

I did google it but it still does not make much sense to me. I have a single lead pm so I am not sure why it was turned on in the first place but it was allowing my heart rate to drop low before kicking in. I still feel like I am on a roller coaster most of the time but atleast it doesn't drop below 80 now before jumping back up high. THat was why I was feeling like I would pass out. I can't believe they didn't catch it before now!

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