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Journal Club - Enuresis Nocturna connected to underexplored Cardiac Arrhythmias - Video
Overview
Enuresis nocturna is characterised by an involuntary act of bedwetting during sleep at an age which is beyond the normal and expected age of bedwetting.Several causes can be attributed to its occurrence in individuals who were previously continent and later develop this condition which may include urinary tract infections or anatomic malformations, emotional disturbances, epilepsy, sleep apnea, and certain medications.
When a normally continent individual experiences enuresis nocturna, treating physicians typically consider a differential diagnosis of urinary tract infections, anatomic malformations, emotional disturbances, epilepsy, sleep apnea, and the effects of diuretic or sedative medications. Despite the fact that involuntary urination during sleep can be a symptom of certain potentially lethal cardiac arrhythmias, they are rarely considered in the diagnostic evaluation.
The sudden death from long QT syndrome type 2 of a 23-year-old female who had experienced two isolated bedwetting episodes but no other symptoms, prompted researchers to examine the prevailing protocols among physicians likely to encounter patients with unexplained enuresis. They conducted an anonymous internet-based survey asking physicians to select the diagnostic tests they would perform for a patient with unexpected and unexplained bedwetting and no other symptoms. The 346 respondents included 102 pediatricians, 73 family physicians, 57 internal medicine specialists, 35 residents, 37 interns, and 42 advanced medical students. Of these, 114 were senior physicians with more than three years of experience.
Most of the survey respondents said they would perform urinalysis and kidney ultrasound following events of enuresis to search for an underlying urinary disease. Many also selected testing for diabetes and abnormalities in urinary flow. While 19% recommended performing an encephalogram, an indication that they considered the possibility of nocturnal epileptic seizures as a potential cause, only 1% thought that performing an electrocardiogram was indicated. This finding demonstrates that arrhythmic seizures are practically never considered part of the differential diagnosis of unexplained enuresis.
The medical community recognizes that arrhythmias are an important cause of daytime syncope, and the electrocardiogram is considered an essential tool for its evaluation. It is important to raise the awareness to the fact that the same arrhythmias known to cause syncope in the "awake patient" may also cause nocturnal seizures during sleep. If these nocturnal seizures are not witnessed, then unexplained bedwetting may be the only clue remaining from the dramatic event.
Dr. Viskin explained that the underlying diagnosis for most cases of enuresis will not be an arrhythmic syncope, especially with young patients. However, it is important to explore this possibility, particularly when the events are highly sporadic, noting that "An electrocardiogram is an inexpensive and easily performed test that is invaluable for diagnosing potentially fatal diseases that can be easily cured."
Speakers
Isra Zaman
B.Sc Life Sciences, M.Sc Biotechnology, B.Ed