Mushrooms and other psychedelics do moderately stimulate the cardiovascular system and may put additional stress on the heart through direct action on serotonin receptors in the heart and coronary arteries. The peak rise in blood pressure and heart rate tend to be during the heaviest part of the come-up, and things tend to settle down (but remain a bit elevated) as one enters the peak. Another period of potential stress occurs as the effects begin to drop off and blood flow patterns change again.
I haven't taken blood pressure during trips until i had minor svt episode 2 weeks ago with a 4g trip. I took my BP before the effects started getting strong and it was 170 over 110 with a hr of 110 and climbing.
I'm glad you are ok! I've seen many anecdotal reports of high systolic numbers like you have, but often these are pretty transient and not inconsistent with what occurs during certain kinds of exercise. To me your diastolic number is more concerning, and diastolic rises tend to be much less pronounced on psychedelics. The heart rate seems a bit high but is really not unusual for a trip. If you had anxiety over your condition, that could certainly contribute to heart rate elevation also.
The most important thing with these high numbers is that they are transient and short-lived. In a typical trip, the cardiovascular figures tend to peak for only a short time---maybe only 5-10 minutes. A heart rate of 100-120 bpm is not unusual during a strong come-up. However, the heart should come down to around 90 bpm or less as you settle into the trip, depending on your activities of course. Systolic blood pressure can spike pretty hard too, but it shouldn't take long to come down to something in the 140s or less.
In the known history of mushrooms use, serious complications related to the cardiovascular stress occur only very rarely, but until recently most users skewed young and healthy. In Colorado and presumably Oregon where psychedelic therapy is now regulated by the state, patients are required to be screened before being allowed to take psychedelic drugs, and the screening excludes people with cardiovascular disease unless they have specific permission from a physician. I don't know the precise details of this, and it's something that may have been revised since I looked. FWIW, I have heard rumors of a psilocybin-related death caused by cardiovascular failure in a subject (IIRC in his 70s) who had a history of cardiovascular disease.
I'm not a doctor or even a heart expert, but I can suggest a rule of thumb: A person should not use psychedelics if they cannot tolerate both a few minutes of high intensity exercise (i.e. zone 4 cardio); and a few hours of medium intensity exercise (i.e. zone 2 cardio). Psychedelics don't tend to push the heart rate up to zone 4 levels, but they do make the heart work a lot harder through direct action and systolic blood pressure rise. I should also note that heavy doses of any psychedelics may increase the strain on the heart relative to lower doses if there is substantial muscle breakdown taking place.
Sorry that I really don't know much about SVT, so I'm not going to try to give any advice specific to your case. Best wishes whatever you choose to do going forward.
