title: Prognostic impact of baseline and serial changes in electrocardiographic left ventricular hypertrophy in resistant hypertension.
abstract: BACKGROUND
  The prognostic value of electrocardiographic left ventricular hypertrophy (ECG-LVH) in resistant hypertension (RH) is unknown. The aim was to evaluate the importance of baseline and serial changes in ECG-LVH as predictors of cardiovascular morbidity and mortality in patients with RH.
  
  
  METHODS
  At baseline and during follow-up, 552 resistant hypertensive patients had 3 ECG-LVH criteria obtained: Sokolow-Lyon, Cornell voltage, and Cornell voltage-duration product. Primary end points were a composite of fatal and nonfatal cardiovascular events and all-cause and cardiovascular mortalities. Total strokes and coronary heart disease (CHD) events were secondary end points. Multiple Cox regression assessed the associations between time-varying ECG-LVH and subsequent end points.
  
  
  RESULTS
  After a median follow-up of 4.8 years, 70 patients died, 46 from cardiovascular causes; and 109 total cardiovascular events occurred, 46 strokes, and 44 CHD events. After adjustment for several cardiovascular risk factors, baseline Cornell voltage and product, but not Sokolow-Lyon voltage, were independent predictors of the composite end point and of all-cause and cardiovascular mortalities. Reductions of all ECG-LVH criteria were protective factors for the composite end point: a 1-SD (1.1 mV) reduction in Sokolow-Lyon voltage was associated with a 35% lower risk (95% CI 10%-53%) of cardiovascular events, whereas prevention or regression of Cornell product LVH criterion implied a 40% lower risk (95% CI 11%-60%). Baseline and serial changes in Sokolow-Lyon voltage were independent predictors of strokes, whereas Cornell voltage was predictive of CHD events.
  
  
  CONCLUSIONS
  Baseline and serial changes in ECG-LVH predict cardiovascular morbidity and mortality in RH patients. Antihypertensive treatment targeted at regression or prevention of ECG-LVH may improve prognosis.
authors.affiliation: Department of Internal Medicine, University Hospital Clementino Fraga Filho, Federal University of Rio de Janeiro, Brasil. gilsalles@hucff.ufrj.br <gilsalles@hucff.ufrj.br>
authors.forename: Gil Fernando
authors.initials: GF
authors.lastname: Salles
authors.forename: Claudia Regina Lopes
authors.initials: CR
authors.lastname: Cardoso
authors.forename: Roberto
authors.initials: R
authors.lastname: Fiszman
authors.forename: Elizabeth Silaid
authors.initials: ES
authors.lastname: Muxfeldt
mesh_terms: D000368:Aged; D002318:Cardiovascular Diseases / Q000453:epidemiology; D015897:Comorbidity; D004562:Electrocardiography; D005260:Female; D006801:Humans; D006973:Hypertension / Q000453:epidemiology; D017379:Hypertrophy, Left Ventricular / Q000000981:diagnostic imaging* / Q000453:epidemiology / Q000401:mortality* / Q000517:prevention & control; D008875:Middle Aged; D011379:Prognosis; D016016:Proportional Hazards Models; D011446:Prospective Studies; D018570:Risk Assessment; D016019:Survival Analysis; D014463:Ultrasonography