When I was a kid, I had a heart condition called 'SVT'- Supra-Ventricular Tachycardia. When you're born, you have a collection of nerve endings which control th

When I was a kid, I had a heart condition called 'SVT'- Supra-Ventricular Tachycardia. When you're born, you have a collection of nerve endings which control the heart rate, & normally, the weaker ones die off & leave a single strong connection. In my case I had a tie for the heartbeat-signalling transmitters. They would oftentimes get caught up in a feedback loop which would leave me with a double heart rate until something would interrupt them & set a hiccup to make my heart just listen to the dominant transmitter again. It was eventually rectified vie an Radio Frequency (RF) Ablation procedure which burned & killed the second-strongest transmitter causing the problem. But before I had the operation I was instructed to dunk my head in ice water when I had an attack- to try to initiate a hiccup & disable the second-in-command transmitter. Another technique was to do a handstand & stay upside-down as long as it took for the gravity to cause an interruption in the signals enough to disengage the offending transmitter. Yet another technique was to bear down as if I'm taking a constipated dump, which increases blood pressure in spurts & would issue just enough resistance to stop the feedback loop. The most effective of these methods was the ice water & I remember since it wasn't readily available at school, I'd be upside down alot of times in the hallway outside my classroom- & it took forever to get it under control alot of the time. I got picked on for that- it sucked.