title: Long-term effectiveness of cardiac resynchronization therapy in heart failure patients with unfavorable cardiac veins anatomy comparison of surgical versus hemodynamic procedure.
abstract: OBJECTIVE
  This study sought to compare clinical, echocardiographic, and cardiopulmonary exercise testing response to cardiac resynchronization therapy (CRT) in patients with unfavorable anatomy of coronary sinus (CS) veins, randomized to transvenous versus surgical left ventricular (LV) lead implantation.
  
  
  BACKGROUND
  CRT efficacy depends on proper positioning of the LV lead over the posterolateral wall. A detailed pre-operative knowledge of CS anatomy might be of pivotal importance to accomplish a proper LV lead placement over this area.
  
  
  METHODS
  Study population included 40 patients (age 66 ± 4 years) with heart failure and indication to CRT, with unsuitable CS branches anatomy documented by pre-operative multislice computed cardiac tomography; 20 patients (Group 1) underwent surgical minithoracotomic LV lead implantation whereas 20 (Group 2) were implanted transvenously. New York Heart Association functional class, echocardiographic, and cardiopulmonary exercise testing data were assessed before and 1 year after CRT-system implant.
  
  
  RESULTS
  In all Group 1 patients, the LV leads were placed over the middle-basal segments of the posterolateral wall of the LV. This was not possible in Group 2 patients. One year after CRT, in Group 1, a significant improvement of New York Heart Association functional class, LV ejection fraction (from 28.8 ± 9.2% to 33.9 ± 7.2%, p < 0.01), LV end-systolic volume (from 165 ± 53 ml to 134 ± 48 ml, p < 0.001), and peak Vo(2)/kg (from 10.4 ± 4.5 ml/kg/min to 13.1 ± 3.1 ml/kg/min, p < 0.02) was observed. However, no improvement was observed in Group 2: LV ejection fraction varied from 27.4 ± 4.8% to 27.4 ± 5.7% (p = 0.9), LV end-systolic volume from 175 ± 46 ml to 166 ± 44 ml (p = 0.15), and peak Vo(2)/kg from 11.2 ± 3.2 ml/kg/min to 11.3 ± 3.4 ml/kg/min (p = 0.9). Changes after CRT between groups were highly significant.
  
  
  CONCLUSIONS
  In the setting of unfavorable CS branches of anatomy, CRT by a surgical minithoracotomic approach is preferable to transvenous lead implantation.
authors.affiliation: Centro Cardiologico Monzino, Istituto di Ricerca e Cura a Carattere Scientifico (IRCCS), Via Parea 4, Milan, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Giraldi
authors.forename: Gaia
authors.initials: G
authors.lastname: Cattadori
authors.forename: Maurizio
authors.initials: M
authors.lastname: Roberto
authors.forename: Corrado
authors.initials: C
authors.lastname: Carbucicchio
authors.forename: Mauro
authors.initials: M
authors.lastname: Pepi
authors.forename: Giovanni
authors.initials: G
authors.lastname: Ballerini
authors.forename: Francesco
authors.initials: F
authors.lastname: Alamanni
authors.forename: Paolo
authors.initials: P
authors.lastname: Della Bella
authors.forename: Gianluca
authors.initials: G
authors.lastname: Pontone
authors.forename: Daniele
authors.initials: D
authors.lastname: Andreini
authors.forename: Claudio
authors.initials: C
authors.lastname: Tondo
authors.forename: Piergiuseppe G
authors.initials: PG
authors.lastname: Agostoni
mesh_terms: D058406:Cardiac Resynchronization Therapy / Q000379:methods*; D054326:Coronary Sinus / Q000002:abnormalities* / Q000000981:diagnostic imaging; D015150:Echocardiography, Doppler; D005260:Female; D006333:Heart Failure / Q000628:therapy*; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000453:epidemiology; D010101:Oxygen Consumption; D011446:Prospective Studies; D012720:Severity of Illness Index; D013318:Stroke Volume; D013599:Systole; D020775:Thoracic Surgery, Video-Assisted; D013908:Thoracotomy; D014057:Tomography, X-Ray Computed / Q000379:methods