It is found that coughing deeply and vigorously can stop a heart attack from turning deadly. Properly timed and performed coughs could allow a heart attack victim to remain conscious and regain an effective heart beat. If you feel palpations or lightheaded, take deep breaths and cough repeatedly and very vigorously and hard several times. This could support your circulation for a while until help arrives. A deep breath should be taken before each cough and the cough must be deep and prolonged. A breath and a cough should be repeated every two seconds until help arrives or until the heart is beating normal again.
Coughing deeply would cause a pumping action that would cause blood to be pushed through the body and to the brain. Coughing also increases and decreased chest pressure, which can raise a slow heart rate, increase cardiac output, and sometimes stop an arrhythmia. Taking deep breaths get oxygen into the lungs and coughing causes the heart to squeeze and helps the the blood to circulate. The squeezing pressure on the heart also helps it to have a normal rhythm.