7. Arrhythmia
Cardiac rhythm can be divided into two phases: One in which the cardiac cavity fills with blood, and another in which the cardiac muscle contracts and pumps blood into the bloodstream, thus maintaining adequate hemodynamics. This process naturally occurs in a steady and rhythmical way; however, when that rhythm is disturbed, it is a clear sign that something is wrong with the cardiovascular system.
An arrhythmia is just such an alteration of the heart’s rhythm. Arrhythmias can be accompanied by weakness, dizziness or difficulty breathing and may be interpreted as evidence of a heart attack, heart insufficiency, or even coronary artery disease.