Please help it happened again it feels like someone squeezed it for a second and let iff then my heart jump up to 150 bpm im so scared

Okay, you need to give yourself that proverbial slap across the face to dislodge you from the apparent hysteria you're experiencing. There is nothing wrong with your heart.

When the vagus nerve inappropriately stimulates the heart, the consequential sensation can vary depending upon precisely when the wayward impulse enters the cardiac cycle. If it does so in association with atrial depolarization, the sensation is most commonly experienced as a light fluttering effect because the atria are small and their actions less forceful. If the signal arrives during ventricular depolarization, the subsequent sensation is more likely felt as a hard thud or thump, due to the large size and powerful actions of the ventricles.

If the wayward impulse enters the cardiac cycle during ventricular repolarization, which is the brief instant when the heart is entirely motionless before another cycle begins, then the subsequent sensation can feel like a long pause, or squeezing sensation as the actual pause is accentuated. The subsequent hard and fast pounding heart simply results from a transient drop in blood pressure, which is quickly compensated for in order to prevent you from losing consciousness.

The other factor causing sinus tachycardia is your fear that your heart is actually being potentially squeezed to a halt and prevented from doing its job, which is altogether incorrect and based purely on subjective reasoning associated with the sensation being experienced.

Lastly, based upon the particular notations and sequence of your postings, it's critical for you to recognize that this forum is not real-time and I'm not sitting in front of the screen awaiting postings. It could be several days to weeks before I attend the forum because of my schedule. The point is that your requests for a response due to a real-time experience are based upon a possible misconception regarding the construct and capacity of the forum.

Again, you need to take a breath and relax. You're not going to suffer any type of sudden cardiac event and you need to remind yourself that simply because you perceive your life to be in danger doesn't actually cause it to become possible.

Best regards,

Rutheford Rane, MD (ret.)

No need to apologize. It's simply important when such instances appear to suggest an imminent need for a response to reaffirm the actual capacity of the forum.

You are at no risk, so you need to understand that your fears are an irrational manifestation and simply because you believe it to be possible doesn't mean that such a premise can become real.

Best regards,

Rutheford Rane, MD (ret.)