Patient presents with symptoms suggestive of third-degree atrioventricular (AV) block, including dizziness, syncope, fatigue, and shortness of breath.  Physical examination reveals bradycardia and potentially hypotension.  Electrocardiogram (ECG or EKG) confirms complete heart block demonstrating dissociation between atrial and ventricular activity, with P waves and QRS complexes occurring independently at different rates.  The atrial rate is typically faster than the ventricular rate.  No consistent PR interval relationship is observed.  The QRS complex morphology may be narrow or wide, depending on the location of the escape rhythm.  Differential diagnosis includes second-degree AV block type II, sinus bradycardia, and sinoatrial (SA) block.  Treatment for this complete heart block is focused on increasing the ventricular rate and improving cardiac output.  Immediate management may include atropine, though it is often ineffective.  Definitive treatment usually involves temporary or permanent pacemaker implantation.  The patient's underlying medical conditions, including ischemic heart disease, cardiomyopathy, or drug toxicity, contributing to the third-degree AV block, are being investigated and managed.  Prognosis depends on the underlying cause and successful implementation of pacemaker therapy.  ICD-10 code I44.2, Complete heart block, is documented.  CPT codes for pacemaker insertion, such as 33206, 33207, 33208,  33212, or 33213, may be applicable depending on the specific procedure performed. Ongoing monitoring of heart rate, rhythm, and overall cardiac function will be conducted.