Coronary artery disease, high blood pressure, cardiomyopathy, diabetes and smoking are causes of missed heartbeats, according to Mayo Clinic. An occurring heart attack, excessive alcohol consumption, stress, hypothyroidism and hyperthyroidism are also causes of missed heartbeats.
An irregular heartbeat is known as an arrhythmia. Premature atrial contractions, atrial fibrillation, accessory pathway tachycardia and ventricular fibrillation are types of arrhythmias. Heart block, atrial flutter and premature atrial contraction are also arrhythmias, claims MedicineNet.
A normal resting heart rate is typically 60 to 100 beats per minute. When a heartbeat is over 100 beats per minute, it is known as tachycardia. When a heartbeat is under 60 beats per minute, it is known as bradycardia, says Mayo Clinic.