title: Subjective visual vertical perception relates to balance in acute stroke.
abstract: OBJECTIVE
  To determine whether misperception of the subjective visual vertical (SVV) underlies balance difficulties in hemiplegic patients.
  
  
  METHODS
  Descriptive study, using a convenience sample.
  
  
  METHODS
  Department of physical medicine of a university hospital.
  
  
  METHODS
  Thirty inpatients with hemiplegia after a hemispheric stroke during the 3 previous months.
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  The SVV was tested while subjects sat in a dark room and were asked to adjust a luminous line to the vertical position. Mean SVV deviation and uncertainty, defined as the standard deviation, were calculated for 8 trials. Balance was assessed by the Postural Assessment Scale for Stroke (PASS) and while patients sat on a laterally rocking platform placed on a Satel force platform. The mean body position and the instability score (Lx), calculated as the length of the course of the center of pressure, were recorded. Functional outcome was also evaluated by the FIM instrument.
  
  
  RESULTS
  An abnormal SVV was recorded for 20 of 30 patients. Balance (ie, PASS, Lx) and FIM correlated significantly with SVV tilt (P<.001, P=.01, and P<.001, respectively) and with uncertainty (PASS, P=.006; FIM, P=.003).
  
  
  CONCLUSIONS
  Verticality misperception was related to poor balance and might be an important element in the assessment of contributing factors to balance disorders after stroke. It should probably be taken into account when establishing balance rehabilitation programs for patients with hemiplegia.
authors.affiliation: Department of Physical Medicine and Rehabilitation, Groupe Hospitalier Lariboisiere-F. Widal, Paris, France. isabelle.bonan@lrb.ap-hop-paris.fr
authors.forename: Isabelle V
authors.initials: IV
authors.lastname: Bonan
authors.forename: Emilie
authors.initials: E
authors.lastname: Guettard
authors.forename: Marie C
authors.initials: MC
authors.lastname: Leman
authors.forename: Florence M
authors.initials: FM
authors.lastname: Colle
authors.forename: Alain P
authors.initials: AP
authors.lastname: Yelnik
mesh_terms: D000328:Adult; D000368:Aged; D002545:Brain Ischemia / Q000150:complications / Q000503:physiopathology / Q000523:psychology; D016022:Case-Control Studies; D005260:Female; D006429:Hemiplegia / Q000209:etiology / Q000503:physiopathology* / Q000523:psychology*; D006801:Humans; D020300:Intracranial Hemorrhages / Q000150:complications / Q000503:physiopathology / Q000523:psychology; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology; D004856:Postural Balance / Q000502:physiology*; D013028:Space Perception / Q000502:physiology*; D020521:Stroke / Q000150:complications / Q000503:physiopathology* / Q000523:psychology*