ArticlePain and therapy2026
Lateral Decubitus Positioning Increases Pleura-Plexus Distance in Ultrasound-Guided Supraclavicular Brachial Plexus Targeting.
Article in Pain and therapy, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
introductionTo evaluate whether lateral decubitus positioning increases the pleura-plexus distance at the supraclavicular level and to characterize its role as a modifiable anatomical factor relevant to ultrasound-guided interventions.
methodsThis prospective observational ultrasound study included 90 adults comprising individuals with complex regional pain syndrome, cervical spine stenosis, and healthy controls. Pleura-plexus distance was measured at end expiration in three standardized positions: semi-reclined supine, 45° lateral tilt, and lateral decubitus. Positional effects were assessed using mixed repeated-measures analysis of variance, and associations with demographic variables were examined using correlation and multivariable linear regression.
resultsPleura-plexus distance increased progressively across positions in all groups. Compared with the semi-reclined position (0.37-0.46 cm), lateral decubitus positioning more than doubled the distance (0.82-1.04 cm; p < 0.001), with a significant group interaction. Body mass index independently predicted pleura-plexus distance in the lateral position (+0.028 cm per kg/m
conclusionsLateral decubitus positioning was consistently associated with increased pleura-plexus distance at the supraclavicular level across all study groups. These findings suggest that patient positioning represents a measurable and potentially modifiable anatomical factor that may influence anatomical conditions relevant to ultrasound-guided supraclavicular procedures.
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