Medical Can MRI Scans Affect Heart Rate?

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During an MRI of the right shoulder in an open MRI setting, the individual experienced an increase in heart rate during the fourth cycle of scans, despite feeling calm and relaxed. This reaction was unexpected, as they are accustomed to managing stress due to their background as a mountain bike racer. The individual noted that they had a similar experience during a previous low back MRI, initially attributing it to claustrophobia, but did not feel claustrophobic this time. The discussion raises questions about potential causes for the increased heart rate during MRI scans, suggesting that factors other than anxiety or claustrophobia may be at play.
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I was going to post in another thread with this title but it was closed? I had an MRI of the right shoulder today in an open MRI and went through about 6 cycles of scans (I think it was 6). During the 4th cycle I noticed that my heart rate was increasing. I went into this with a calm demeanor and was very relaxed so I know it wasn't me getting nervous. Being a mountain bike racer I was able to calm the rate down some until the 4min was up.

The last two cycles I was totally fine. What could cause this because I had this happen in the past for a low back MRI and I thought it was me getting claustrophobic but I really didn't feel that way.
 
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It's not the MRI, so we wouldn't know.
 

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