The chest/Cardiac pain can be encountered at any time, any place to any person & shall lead to Cardiac Arrest/Death. With experience of chest discomfort/pain first step to manage the patient/yourself is Sit down on ground/chair etc Can lean forward at 75 degrees of angle, stop all activities & Start deep forceful respiration (inspiration/expiration, expiration can be preferred though open mouth), so that pressure gradient should continously change over to make blood flow turbulent to make/keep the heart beating, even on oxygen mask and Never lie down on bed at home, in ambulances, in hospital even for ECG. Till the pain subsides/relieved even with medication.
A sitting posture is a Natural Gift to save lives in the chest pain/cardiac pain. Do share your experiences/ideas!