Wearing a Holter Monitor on Shabbat
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Question
The doctor told me that I need to undergo a Holter monitor test for a continuous month and I am allowed to remove it only for short showers. Is it permissible to wear it on Shabbat?
Answer
Hello, since the Holter test is intended to check the heart and to adjust the correct medical treatment for the heart, it is defined as pikuach nefesh, and it is obligatory to wear it according to the doctor's instructions. However, since the main issue is removing and putting on the device, one should avoid doing so on Shabbat, meaning to wear it before Shabbat and keep it on throughout Shabbat. Additionally, one should avoid going out with the device to places where there is no eruv on Shabbat. Refuah shlema.
Source
Shulchan Aruch (Orach Chaim, Siman 328).