The document provides instructions for what to do if experiencing a heart attack while alone. It advises that without help, a person has about 10 seconds before losing consciousness. The key is to not panic, but instead start coughing repeatedly and taking deep breaths before each cough. Coughing squeezes the heart and keeps blood circulating, while deep breaths get oxygen to the lungs. This technique can help the heart regain its normal rhythm until help arrives or the heart feels normal again. The document stresses sharing this information widely as it could save lives.