First-degree heart block (also called first-degree AV block).

Treatment: First-degree heart block generally requires no treatment, although some people may need to be treated for an underlying electrolyte imbalance. If medications are causing the condition, a physician may reevaluate the dosage or advise the patient to stop taking it. Medications should not be adjusted without consulting a medical professional. A physician may recommend follow-up with a cardiologist to be sure that the patient does not develop a more severe form of heart block. Follow-up is particularly important if first-degree heart block developed as a result of a past heart attack or myocarditis. In patients with severe heart failure and first-degree heart block, implantation of a pacemaker may sometimes improve cardiac performance. Otherwise, further treatment is generally unnecessary and prognosis is excellent.

Type I second-degree heart block (also known as Mobitz Type I second-degree AV block or Wenckebach AV block).

Treatment: Type I second-degree heart block is generally treated by addressing any underlying conditions that are contributing to it. Temporary pacing and/or medication (e.g., atropine) may be required if the heartbeat is too slow, but a permanent pacemaker is generally not necessary unless the condition worsens.

Type II second-degree heart block (Mobitz Type II second-degree AV block)

Treatment: Type II second-degree heart block often produces noticeable symptoms and carries a significant risk of potentially life-threatening complications. Therefore, treatment is very important. A physician may administer medications (e.g., atropine) and recommend the implantation of a permanent pacemaker. If the condition worsens to third-degree heart block, then a temporary pacemaker wire may be needed during the medical crisis until a permanent pacemaker can be inserted.

Third-degree heart block (also known as complete heart block or complete AV block)

Treatment: Third-degree heart block patients almost always require an artificial pacemaker to better regulate the electrical activity of the heart. If a medical crisis occurs before the pacemaker can be implanted, then a temporary pacemaker wire may be used to keep the heart beating. Most patients who are diagnosed with complete heart block will require placement of a permanent pacemaker, unless a treatable cause is identified and corrected..

Bundle Branch Block is when electrical impulses are slowed or blocked as they travel through specialized conducting tissue in the ventricles.