Third-degree heart block is the most serious of the three types of heart block. It's often triggered by a heart attack but can also have other causes.

In third degree heart block, the rhythm of the P waves occurs completely independently of the rhythm of the QRS waves. The electrical impulses stop getting through from the atria to the ventricles.

Treatment of third degree heart block usually involves a pacemaker to maintain a healthy rate and rhythm. In some cases, treatment may include medications.

Third-degree heart block is potentially life-threatening, and most people need the placement of a pacemaker (a small electronic device placed underneath the skin to help the heart beat normally ...

Second degree heart block type one is a typically harmless form of heart block that may require no treatment. ... This affects heart rhythm. ... differentiating it from third degree heart block.

Healthcare providers categorize second-degree heart block subtypes—Mobitz type 1 and type 2—based on their physical signs on an electrocardiogram (ECG), which records the electrical activity ...

The incidence of AV block increased with higher antibody titer levels, reaching 7.7% for those in the top quartile for anti–60-kD SSA/Ro; this increased to 27.3% in study participants with a ...