Heart Block

First-Degree Heart Block:

• Description: The electrical signals are delayed as they pass through the atrioventricular (AV) node, but all signals eventually reach the ventricles.
• ECG Findings: Prolonged PR interval (>200 ms)
• Symptoms: Usually asymptomatic
• Treatment: Generally, no treatment is required.

Second-Degree Heart Block (Type I or Mobitz I/Wenckebach):

• Description: Progressive lengthening of the PR interval until a QRS complex is dropped.
• ECG Findings: Increasing PR interval with dropped QRS complex
• Symptoms: May be asymptomatic or may experience dizziness
• Treatment: Close monitoring, may require a pacemaker

Second-Degree Heart Block (Type II or Mobitz II):

• Description: Some electrical signals are blocked, leading to dropped QRS complexes without PR interval prolongation.
• ECG Findings: Dropped QRS complexes with constant PR interval
• Symptoms: Dizziness, fainting
• Treatment: Usually requires a pacemaker

Third-Degree Heart Block (Complete Heart Block):

• Description: No electrical signals from the atria reach the ventricles.
• ECG Findings: Atria and ventricles beat independently
• Symptoms: Fatigue, dizziness, fainting
• Treatment: Requires immediate pacemaker implantation