The patient's pulse, according to experienced doctors, is the mirror of heart health. A frequent or low pulse indicates a developing pathology. According to the rhythmic contraction of the heart muscle, doctors judge the blood flow, the health of the bloodstream, the state of the heart as a whole, and if the rhythm deviates from the norm, then this condition is called arrhythmia.

Acute coronary syndrome is any group of clinical signs or symptoms suggesting acute myocardial infarction (death of cardiac muscle cells due to impaired blood flow in this area) or unstable angina (a variant of acute myocardial ischemia, the severity and duration of which is insufficient for the development of myocardial infarction).