Micturition Syncope (Fainting With Urination)
Description
Fainting while urinating or just after urinating. This problem usually occurs in older men and during the night when they wake up to urinate. The exact mechanism of why this occurs is not known but is believed to be caused by a stimulation of the vagus nerve that causes a drop in blood pressure and a slow heart rate resulting in fainting. Straining to urinate may increase the frequency of this disorder. Certain medications, alcohol and being dehydrated can increase the frequency of these events. It is recommended patients with this disorder see their doctor to make sure something more serious is not causing the fainting. It is believed micturition syncope causes 2%-8% of all cases of fainting in adults. Similar fainting episodes can occur with having a bowel movement as well.
Symptoms
Fainting during urination or after urination. Feeling lightheaded during or after urination.
Tests
A history and physical exam will be done. Blood tests and an EKG may be done to rule out other causes of fainting.
- CBC
- Chem 12
- EKG
Treatment
There is no definitive treatment. Staying hydrated and decreasing alcohol intake may stop the episodes. The healthcare provider may adjust, stop and substitute medications to prevent recurrences. Sitting on the edge of the bed before walking to the bathroom and urinating sitting down may prevent the fainting episodes. Patients at risk for this problem should leave the door open when they urinate and remove all sharp objects from around the toilet.
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