Institute of Inflammation and Aging, University of Birmingham, Birmingham, UK.
Centre for Trauma Sciences Research, University of Birmingham, Birmingham, UK.
Wilderness Environ Med. 2024 Jun;35(2):147-154. doi: 10.1177/10806032241234665. Epub 2024 Mar 11.
Suspension syndrome (SS) develops when venous blood pools in extremities of passively suspended individuals, resulting in presyncopal symptoms and potential unconsciousness or death independent of additional injuries. We investigated use of leg raising to delay onset of SS, as it can decrease venous pooling and increase cardiac return and systemic perfusion.
Participants were suspended in rock climbing harnesses at an indoor climbing wall in a legs-dangling control position or a legs-raised interventional position to compare physiological outcomes between groups. Participants were suspended for a maximum of 45 min. Onset of 2 or more symptoms of SS, such as vertigo, lightheadedness, or nausea, halted suspension immediately. We recorded each participant's heart rate, blood pressure, oxygen saturation, lower leg oxygen saturation, pain rating, and presyncope scores presuspension, midsuspension, and postsuspension, as well as total time suspended.
There were 24 participants. There was a significant difference in total time suspended between groups (43.05±6.7 min vs 33.35±9.02 min, =0.007). There was a significant difference in heart rate between groups overall (=0.012), and between groups, specifically at the midsuspension time interval (80±11 bpm vs 100±17 bpm, =0.003). Pain rating was significantly different between groups (=0.05). Differences in blood pressure, oxygen saturation, lower leg oxygen saturation, and presyncope scores were not significant.
Leg raising lengthened the time individuals tolerated passive suspension and delayed symptom onset.
当静脉血液在被动悬挂的肢体中积聚时，会发生悬浮综合征（SS），导致晕厥前症状和潜在的无意识或死亡，而与其他损伤无关。我们研究了使用腿部抬高来延迟 SS 的发作，因为它可以减少静脉淤积，增加心脏回流和全身灌注。
参与者在室内攀岩墙的攀岩背带中悬挂，处于腿部悬垂的对照位置或腿部抬高的干预位置，以比较组间的生理结果。参与者最多可悬挂 45 分钟。当出现 2 个或更多 SS 症状（如头晕、头晕或恶心）时，立即停止悬挂。我们记录了每个参与者的心率、血压、血氧饱和度、小腿血氧饱和度、疼痛评分和晕厥前评分，以及悬挂前、悬挂中和悬挂后的总时间。
共有 24 名参与者。两组之间的总悬挂时间存在显著差异（43.05±6.7 分钟与 33.35±9.02 分钟，=0.007）。两组之间的心率存在显著差异（=0.012），特别是在悬挂中期时间间隔（80±11 bpm 与 100±17 bpm，=0.003）。两组之间的疼痛评分存在显著差异（=0.05）。血压、血氧饱和度、小腿血氧饱和度和晕厥前评分的差异没有统计学意义。
腿部抬高延长了个体耐受被动悬挂的时间并延迟了症状发作。
