Dear Doctor.
Thanks for your answer.
I still have query.
Pls. read below comments and pls. explain me.
I still lthink that if particle touch the myocardium... that cannot make people die..
doctor also told me that if large needle prick and bleeding is contiuning... then he must die.. I also agree with docor's comment..

(another doctor's comment)

It’s clear that I and the other expert share almost the same opinion about what happen when a wood particle penetrate endocardium and reach the myocardium. We both think that it will cause a sharp pain, and arrhythmia.

We only disagree about sudden death. Unfortunately it’s impossible to make such experiments on humans and I only can explain it theoretically. I would like to explain two principal mechanism that may lead to death in such a case:

There are 2 main mechanisms to cause death if a piece of particle is entering myocardium:
1. The PAIN, it’s very sharp and intense. Myocardium is a very sensitive muscle and the minor damage is very similar to infarction and cause severe chest pain. If it’s not relieved by opioids, it may lead to traumatic shock, cardio respiratory arrest and death.
2. When first the wood particle reach the myocardium (half is on endocardium, half on myocardium) it will cause arrhythmia (Premature Ventricular Complex). Keep in mind that this will happen every heart beats. This PVCs within minutes the PVCs will degenerate on more severe ventricular arrhythmias (ventricular tachycardia i.e. VT and ventricular fibrillation i.e. VF) because the wood damaged myocardial zone (even that it’s only a small area) will serve as a trigger area. Another mechanism that degenerate PVC on life threatening arrhythmias (VT and VF) is excessive adrenaline released from pain and myocardial damage.

As you can see are a lot of mechanism that contribute to lethal arrhythmias even that your heart is normal. The only way to survive if wood particle reach the myocardium is through getting the piece removed (from myocardium).