***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: We evaluated arterial oxygen saturation ( SaO2 ) and heart rate in acute stroke patients to determine whether routine positioning affected these physiological parameters . Measurements were recorded at the bedside non-invasively in five different positions assigned in r and om order each maintained for 10 min . One hundred and twenty-nine patients examined within a median of 72 h , lying on the left side result ed in slightly lower SaO2  than lying on the right side , which was statistically significant in the patients with a right ( n = 66 ) , but not left , hemiparesis . Patients able to sit in a chair ( n = 65 ) , who mostly had less severe strokes , had a significantly higher mean SaO2 and heart rate when sitting in the chair than when placed in any other position . About 10 % of patients , especially those with a severe stroke , with right hemiparesis and concomitant chest disease , experienced falls in SaO2 to 90 % or less for ≧2 min in certain positions ; the hypoxia was more likely when they were lying on their left side . These results may have implication s for current practice and for future patient positioning strategies to improve outcome after stroke PURPOSE The survey was undertaken to identify current physiotherapy practice for positioning patients in the first week following stroke . METHOD A postal question naire comprised of closed questions , was sent to 674 physiotherapists identified as working with patients in the first week following stroke , who were employed in 155 r and omly selected NHS Trusts throughout Engl and . RESULTS Response rate was 73 % . Specific positions were recommended during the first week following stroke by 98 % of respondents . The most common aims of positioning were modulation of muscle tone ( 93 % ) , preventing damage to affected limbs ( 92 % ) and supporting and stabilizing body segments ( 91 % ) . The positions sitting in an armchair , side lying on the non-hemiplegic side and side lying on the hemiplegic side were recommended by 98 % , 96 % and 92 % of respondents respectively . The components of the positions considered as ' most important ' varied between positions , proximal components were usually preferred to distal components . CONCLUSION Positioning is still an important part of physiotherapy practice and therefore requires evaluation . The positions used and the aims of positioning identified by clinicians accord with those in the literature . However , there is a lack of consensus regarding key components of the positions . The positions identified in this study should now be systematic ally evaluated for their ability to achieve different aims 
    Output:
    
There was strong evidence that body position did not affect oxygen saturation in acute stroke patients without relevant ( respiratory ) co-morbidities .
There was limited evidence that sitting in a chair had a beneficial effect and lying positions had a deleterious effect on oxygen saturation in acute stroke patients with respiratory co-morbidities .