title: Intra-arterial blood pressure reading in intensive care unit patients in the lateral position.
abstract: BACKGROUND
  Routine lateral turning of patients has become an accepted standard of care to prevent complications of immobility. The haemodynamic and oxygenation effects for patients in both lateral positions (45°) are still a matter of debate. We aimed to study the effect of these positions on blood pressure, heart rate and oxygenation in a general intensive care population.
  
  
  METHODS
  Observational study.
  
  
  METHODS
  Twenty stable intensive care unit patients had intra-arterial blood pressure recordings in the supine and lateral positions with the correction of hydrostatic height compared with a fixed reference point (phlebostatic level). A multilevel model was used to analyse the data.
  
  
  RESULTS
  Mean arterial pressure readings in the lateral positions were, on average, 5 mmHg higher than in the supine position (p < 0.001). There were no significant differences between mean arterial pressure recordings in the left and right lateral position (p = 1.0). No important differences in oxygenation and heart rate were observed. After correction for covariates, the effects persisted.
  
  
  CONCLUSIONS
  Our study demonstrated an increase, albeit small, in blood pressure in the lateral positions. No major differences between the left and right lateral position were found. No important differences in oxygenation and heart rate were observed.
  
  
  CONCLUSIONS
  Turning haemodynamically stable patients in the intensive care unit has no important effects on blood pressure measurements when continuous hydrostatic height correction is applied.
authors.affiliation: Department of Neurology, University Medical Centre Groningen, Groningen, The Netherlands. m.j.h.aries@neuro.ucmg.nl
authors.forename: Marcel J H
authors.initials: MJ
authors.lastname: Aries
authors.forename: Adnan
authors.initials: A
authors.lastname: Aslan
authors.forename: Jan Willem J
authors.initials: JW
authors.lastname: Elting
authors.forename: Roy E
authors.initials: RE
authors.lastname: Stewart
authors.forename: Jan G
authors.initials: JG
authors.lastname: Zijlstra
authors.forename: Jacques
authors.initials: J
authors.lastname: De Keyser
authors.forename: Patrick C A J
authors.initials: PC
authors.lastname: Vroomen
mesh_terms: D000368:Aged; D001794:Blood Pressure; D005260:Female; D006801:Humans; D007297:Inpatients; D007362:Intensive Care Units; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods*; D011187:Posture