The document provides instructions for what to do if experiencing a heart attack while alone in a car. It advises to not panic, but to start coughing repeatedly and taking deep breaths before each cough. This should be done every two seconds without stopping until help arrives or the heart regains its normal rhythm. Coughing and deep breathing helps get oxygen to the lungs and keeps blood circulating by squeezing the heart, which can help it regain its normal rhythm. Spreading awareness of this technique could help save lives, as heart attacks can occur in people of all ages nowadays.