The patient's ECG reveals ______ block, with P waves present but no corresponding QRS complexes.

Complete heart block (third-degree AV block) is characterized by a complete dissociation between atrial and ventricular activity. P waves are present but have no relationship to QRS complexes, as the electrical signal cannot pass through the AV node.

• Complete Heart Block (Third-degree AV Block)
- Complete dissociation between atrial and ventricular activity
- P waves present with no relationship to QRS complexes
- Independent atrial and ventricular rates
- Regular P waves but slower QRS rhythm
- Ventricular escape rhythm takes over
- AV conduction ratio not fixed
- High risk of cardiac arrest
- Common causes: myocardial infarction, fibrosis, medications
- Treatment often requires permanent pacemaker
- Emergency intervention may be necessary
- Symptoms: dizziness, syncope, fatigue
- Bradycardia usually present
- Can be congenital or acquired
- Requires continuous monitoring
- ECG shows AV dissociation
- May progress from lower-degree blocks
- Associated with poor prognosis if untreated
- Regular but slow ventricular rate
- Hemodynamic compromise possible