title: [Idiopathic arrhythmias: possibilities of complex nosological diagnosis, and differentiated treatment].
abstract: OBJECTIVE
  of the study was to elucidate nosological nature of "idiopathic" arrhythmias by means of complex clinical-morphological examination and to assess efficacy of differentiated (including etiotropic and pathogenetic) treatment.
  
  
  METHODS
  We examined 190 patients (117 women, mean age 45.33 ± 14.84 years) with "idiopathic" arrhythmias: atrial fibrillation (38.9%) (AF,) and flutter (11.1%), supraventricular (44.7%) and ventricular (55.3%) extrasystoles (SVE and VE), bouts of ventricular tachycardia (15.8%), atrioventricular block (22,6%) et al. Mean number of antiarrhythmic drugs per patient was 3 (from 1 to 8). Examination included Holter ECG monitoring, echocardiography, determination of anticardiac antibodies (97.4%) and markers of cardiotropic viruses (87.4%), treadmill test (26.3%), transesophageal cardiac pacing (12.1%), electrophysiological investigation (10%), multispiral computed tomography (22.1%), magnetic resonance tomography (21.6%), scintigraphy (27.4%), coronary angiography (10.0%), endomyocardial biopsy (EMB) (10.0%), DNA diagnostics (8.9%).
  
  
  RESULTS
  EMB revealed immune-inflammatory (myo/endocarditis, systemic/myocardial vasculitis) or genetic pathology in 78.9 and 21.1% of cases, respectively. Level of anticardiac antibodies (including specific antinuclear factor) most closely correlated with EMB findings. On the basis of comparison of EMB data with data of complex examination we created algorithm of nosological diagnostics in "idiopathic" arrhythmias. According to nosology all patients were distributed in the following way: 1) chronic infectious-immune myocarditis (n=144, 75.7%), morphologically verified in 14, viral in 27 patients; 2) genetic cardiomyopathy (n=15, 7.9%), morphologically verified in 4, virus positive in 1 (arrhythmogenic right ventricular dysplasia, non-compaction myocardium, Fabri disease, Brugada syndrome, undetermined); in 4 patients mutations in plakophilin 2, desmoglein, desmin, -galactosidase A genes were found; 3) combination of genetic diseases with myocarditis (n=18; 9.5%) including viral (n=3); 4) isolated myocardiodystrophy (tonsillogenic< dyshormonal, n=3, 1.6%); 5) proper idiopathic arrhythmias (n=10, 5.3%). Therapy of myocarditis included antiviral (43.2%) and immunosuppressive (76.3%) drugs. Cardiotropic and antiarrhythmic therapy was also administered. Only in patients with myocarditis it was possible to withdraw effective antiarrhythmic (16.7%) and to improve effect of previously ineffective drugs. Surgical treatment (implantation of pacemaker or cardioverter-defibrillator, radiofrequency ablation) was more frequently used in patients with genetic (39.4%) and idiopathic arrhythmias (53.8%) than in patients with myocarditis (16.0%).
  
  
  CONCLUSIONS
  Etiology of idiopathic arrhythmias can be established in most cases. Their main causes are immune-inflammatory diseases, genetic cardiomyopathies and their combination. Therapy of myocarditis improves antiarrhythmic activity of treatment, in some patients allows to withdraw antiarrhythmic drugs, decrease requirements in surgical treatment and to optimally prepare patients to radiofrequency ablation.
authors.forename: O V
authors.initials: OV
authors.lastname: Blagova
authors.forename: A V
authors.initials: AV
authors.lastname: Nedostup
authors.forename: V A
authors.initials: VA
authors.lastname: Sulimov
authors.forename: E A
authors.initials: EA
authors.lastname: Kogan
authors.forename: A G
authors.initials: AG
authors.lastname: Kupriianova
authors.forename: V A
authors.initials: VA
authors.lastname: Zaĭdenov
authors.forename: A E
authors.initials: AE
authors.lastname: Donnikov
authors.forename: V V
authors.initials: VV
authors.lastname: Kadochnikova
mesh_terms: D000328:Adult; D000889:Anti-Arrhythmia Agents / Q000008:administration & dosage / Q000009:adverse effects / Q000145:classification; D001145:Arrhythmias, Cardiac / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology / Q000628:therapy; D002304:Cardiac Pacing, Artificial / Q000379:methods; D009202:Cardiomyopathies / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy; D017115:Catheter Ablation / Q000379:methods*; D004452:Echocardiography / Q000379:methods; D004554:Electric Countershock / Q000379:methods*; D015716:Electrocardiography, Ambulatory / Q000379:methods; D005080:Exercise Test / Q000379:methods; D005260:Female; D006801:Humans; D008875:Middle Aged; D009200:Myocardial Contraction / Q000187:drug effects; D017063:Outcome Assessment, Health Care; D036542:Tomography, Spiral Computed / Q000379:methods; D016896:Treatment Outcome
chemical_list: D000889:Anti-Arrhythmia Agents