A 68-year-old patient with syncope associated with an urge to urinate differed from other cases of micturition syncope with respect to age, presence of cardiovascular and urinary disease, lack of association with recumbency, and loss of consciousness before onset of micturition. Investigation incriminated vagal stimulation from the distended bladder with transient blocking of the atrioventricular node as the likely mechanism. The patient was successfully treated with a permanent demand pacemaker.
Micturition syncope is probably not a single entity, but a symptom complex arising as a result of several mechanisms.
(JAMA 229:1631-1633, 1974)
Schoenberg BS, Kuglitsch JF, Karnes WE. Micturition Syncope— Not a Single Entity. JAMA. 1974;229(12):1631–1633. doi:10.1001/jama.1974.03230500049027