Impact of sympathetic innervation on recurrent life-threatening arrhythmias in the follow-up of patients with idiopathic ventricular fibrillation.

European Journal of Nuclear Medicine and Molecular Imaging
Matthias PaulT Wichter

Abstract

Idiopathic ventricular fibrillation (IVF) is defined as VF in the absence of any identifiable structural or functional cardiac disease. The underlying pathophysiological mechanisms are unknown. This study was performed to investigate the potential impact of sympathetic dysfunction, assessed by (123)I-meta-iodo-benzylguanidine scintigraphy ((123)I-MIBG SPECT), on the long-term prognosis of patients with IVF. (123)I-MIBG SPECT was performed in 20 patients (mean age 37+/-13 years) with IVF. Mean follow-up of patients after study entry was 7.2+/-1.5 years (range 4.9-10.5 years). Ten patients (five men, five women; mean age 43+/-12 years; p=NS versus study group) with medullary carcinoma of the thyroid gland served as an age-matched control group. Abnormal (123)I-MIBG uptake was observed in 13 patients (65%). During follow-up, 18 episodes of VF/fast polymorphic ventricular tachycardias occurred in four IVF patients with abnormal (123)I-MIBG uptake whereas only two episodes of monomorphic ventricular tachycardia (and no VF) occurred in a single IVF patient with normal (123)I-MIBG uptake. Impairment of sympathetic innervation may indicate a higher risk of future recurrent episodes of life-threatening ventricular tachyarrhythmias in pa...Continue Reading

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