How does myocardial infarction cause retention of urine?

[scilearner]

Hello everyone,

How does this occur. I'm talking about retention (eg urine stuck in bladder) not the pre renal failure which myocardial infarction can obviously cause.

Also while we are at it, I also read diuretics can cause retention of urine also. That's interesting because that defeats their purpose in the first place. So how do diuretics also cause urine retention.

Thanks

[fiveworlds]

How does this occur. I'm talking about retention (eg urine stuck in bladder) not the pre renal failure which myocardial infarction can obviously cause.

 

Obviously there is a whole bunch of reasons why this could happen including the other way around as https://www.facebook.com/nursing20092009/posts/601492069903471suggests

 

 

Also while we are at it, I also read diuretics can cause retention of urine also. That's interesting because that defeats their purpose in the first place. So how do diuretics also cause urine retention.

 

Again there is a load of reasons including idiopathic cyclic edema. There is also evidence to suggest factors such as diabetes mellitus, hypothyroidism, obesity etc.

 

Lastly we tend to avoid giving medical advice. There are many online journals you can read or you can go to your doctor if you are worried,

[Xalatan]

Urinary retention is multiaetiological, but coming back to physiological principle, detrusor and internal urinary sphincter are sympathetically innervated. If there is fight or flight response to the MI, then likely there may be a degree of urinary retention. Especially if you end up infusing inotropes.

 

Diuretics reduce renal resorption of the urine, bladder control is a separate matter. It may be possible to diurese someone but run into retention at the level of the bladder - think prostatic hypertrophy for example.

Edited December 28, 2015 by Xalatan