If ventricular tachycardia is not treated, it can turn into ventricular fibrillation which is often fatal. People with ventricular fibrillation are usually people who have suffered from one or more heart attacks and whose hearts are damaged. Usually medication can treat these arrhythmias. In addition to the above symptoms, ventricular fibrillation can include chest pain. If medical treatment fails in treating atrial fibrillation, a procedure called defibrillation is done, which entails shocking the heart with two electrically charged paddles to restore normal rhythm.
Heart block is another condition that effects the rhythm of the heart.
This is caused by heart damage or blockage of blood vessels. Symptoms can include any of those mentioned. A pacemaker is used to treat this condition, along with medication. A pacemaker is a tiny device surgically implanted under the skin that regulates the heart's rhythm by controlling the electrical impulses. Premature heartbeats are fairly common.