P.A.T.H. is an acronym for Parasympathetic Attacks to the Heart. The thesis of this book is that in a genuine self-defense situation, where life or limb is on the line, the most appropriate defensive response is to counter with an attack to the heart of the aggressor. This means affecting an autonomic response to the heart which culminates in a vasovagal faint, a state of temporary unconsciousness, but with the possibility of a more severe response. Although any attack to the body has implications for the heart, the reference here is to a specific, directed attack to the heart which causes unconsciousness. The easiest way to accomplish this is to affect a parasympathetic heart response. The defensive response needs to affect a subconscious reflex causing a systemic shutdown over which the aggressor has no control. It takes less than a second to affect a parasympathetic response putting the attacker into an unconscious state. This book details the anatomy, physiology and physics relevant to this approach. Also, the book discusses sympathetic autonomic responses, which also have the ability to cause a vasovagal faint, but require more effort and energy with the effect not being as rapid. In the last section of this book are examples of the premise of the P.A.T.H. Approach escalated by looking at five specific defensive responses that have the capability to not only affect a vasovagal faint, but are dangerous enough to easily become lethal.