A 65-year-old male patient with a history of coronary artery disease (bypass grafting 10 years ago), diabetes mellitus, hyperlipidemia, and peripheral vascular disease experienced persistent substernal gripping chest pain and was evaluated in the local emergency room. He was found to be pale and diaphoretic, with runs of nonsustained VT. He was started on intravenous nitroglycerin, heparin, and eptifibatide, and transferred to our facility for suspected acute coronary syndrome. His cardiac enzymes showed a creatine kinase (CK) of 171 u/1 (39-195 u/1), CK MB fraction of 3.2 u/1 (0.0-5.0 u/1), and troponin T of 0.01 ng/ml (0.0-0.1 ng/ml). His serum creatinine was 2.1 mg/dl (0.5-1.4 mg/dl), drug sodium 135 meq/1 (135-145 meq/1), potassium 4.1 meq/1 (3.5-5.0 meq/1), magnesium 2.3 mg/dl (1.7-2.5 mg/dl), generic calcium 9.0 mg/dl (8.5-10.2 mg/dl), and albumin 3.3 g/dl (3.5-5.0 g/dl). Echocardiogram showed mildly dilated left atrium, dilated left ventricle with posterior hypokinesis, and an ejection fraction of 40%.

Over the next day, the patient had numerous premature ventricular contractions (PVCs), followed by multiple runs of VF and polymorphic VT. He was started on intravenous infusion of membrane active antiarrhythmic agents, including lidocaine, procainamide, generic amiodarone, bretylium, and esmolol drug, administered as single-agent and in combination. During periods of frank cardiac arrest, he had to be revived with external electrical cardioversion along with intravenous epinephrine, atropine, and mag nesium sulfate as needed. He was intubated and transferred to the intensive care unit. He continued to have electrical storm requiring multiple defibrillations. At this point, the patient underwent catheterization, which revealed occluded left anterior descending artery (LAD), left circumflex artery, and right coronary arteries (RCA) at the origins. The grafts to LAD and obtuse marginal were patent, and there was diffuse disease beyond the graft insertion sites. The saphenous venous graft to RCA was occluded, and the distal RCA filled adequately from circumflex and LAD collaterals. This was unchanged compared to his previous catheterization one year ago. Acute ischemia was not felt to be the etiology for the patient’s recurrent VF. He continued to have recurrent VF during the catheterization and was subsequently transferred to the electrophysiology lab. buy antibiotics in canada

Figure 1. Telemetry strips showing initiation of ventricular fibrillation/ventricular tachycardia by premature ventricular contraction (PVC). The same morphology of PVC initiated ventricular fibrillation every time.

Review of his telemetry monitor strips revealed identical-looking PVC before each episode of VT/VF (Figure 1). Electrophysiology procedure was performed using standard techniques, with placement of a catheter in the high right atrium, His bundle, and right ventricular apex. There were multiple spontaneous runs of VF during the procedure. A decision was made to ablate a suspected trigger focus indicated by the right-bundle, superior-axis ventricular PVC (Figure 2) using electromagnetic mapping with Biosense CARTO, mapping, and navigation catheter Navistar (Biosense, Diamond Bay, CA). The origin of this ventricular ectopy was mapped to the anterolateral apical free wall of the left ventricle. Linear ablation performed in a cross-like fashion at this site was successful in eliminating the focus of origin (Figure 3). canadian pharmacy

Figure 2. Tracing from the electrophysiology study showing initiation of ventricular fibrillation by characteristic premature ventricular contraction noticed in surface electrocardiographic leads (I, II, III, aVF, VI, V2, V6), intracardiac leads (hRA represents high right atrium, HIS represents His bundle, RVa represents right ventricle), and the arterial pressure line (PRES) showing the blood pressure drop following the arrhythmia.

The patient, prior to leaving the electrophysiology lab, was successfully weaned off all antiarrhythmic agents and did not have any recurrence of VT/VF for 24 hours. He was subsequently extubated the next day. Two days later, a dual-chamber pacemaker defibrillator was implanted, and the patient was discharged home. Implantable cardioverter-defibrillator (ICD) interrogation to-date showed only nonsustained VT. The patient has been off all membrane active antiarrhythmic agents since discharge and remains functional without any residual neurological injury for two years. buy tadacip

Figure 3. Electrophysiological mapping of the originating focus of arrhythmia. Approximately 1 cm² area of the left ventricle free wall (bright red spot in the center) with some of the tags of radiofrequency ablation (multiple small red dots). Ablation at the site eliminated the ventricular fibrillation.

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