Cerebrovascular Reactivity Following Spinal Cord Injury.

IF 2.4 Q1 REHABILITATION

Topics in Spinal Cord Injury Rehabilitation Pub Date : 2024-01-01 Epub Date: 2024-05-23 DOI:10.46292/sci23-00068

Alexander Mark Weber, Tom E Nightingale, Michael Jarrett, Amanda H X Lee, Olivia Lauren Campbell, Matthias Walter, Samuel J E Lucas, Aaron Phillips, Alexander Rauscher, Andrei V Krassioukov

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引用次数: 0

Abstract

Background: Spinal cord injuries (SCI) often result in cardiovascular issues, increasing the risk of stroke and cognitive deficits.

Objectives: This study assessed cerebrovascular reactivity (CVR) using functional magnetic resonance imaging (fMRI) during a hypercapnic challenge in SCI participants compared to noninjured controls.

Methods: Fourteen participants were analyzed (n = 8 with SCI [unless otherwise noted], median age = 44 years; n = 6 controls, median age = 33 years). CVR was calculated through fMRI signal changes.

Results: The results showed a longer CVR component (tau) in the grey matter of SCI participants (n = 7) compared to controls (median difference = 3.0 s; p < .05). Time since injury (TSI) correlated negatively with steady-state CVR in the grey matter and brainstem of SCI participants (R_S = -0.81, p = .014; R_S = -0.84, p = .009, respectively). Lower steady-state CVR in the brainstem of the SCI group (n = 7) correlated with lower diastolic blood pressure (R_S = 0.76, p = .046). Higher frequency of hypotensive episodes (n = 7) was linked to lower CVR outcomes in the grey matter (R_S = -0.86, p = .014) and brainstem (R_S = -0.89, p = .007).

Conclusion: Preliminary findings suggest a difference in the dynamic CVR component, tau, between the SCI and noninjured control groups, potentially explaining the higher cerebrovascular health burden in SCI individuals. Exploratory associations indicate that longer TSI, lower diastolic blood pressure, and more hypotensive episodes may lead to poorer CVR outcomes. However, further research is necessary to establish causality and support these observations.

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脊髓损伤后的脑血管反应。

背景：脊髓损伤（SCI脊髓损伤（SCI）通常会导致心血管问题，增加中风和认知障碍的风险：本研究使用功能磁共振成像（fMRI）评估 SCI 参与者在高碳酸血症挑战期间的脑血管反应性（CVR），并与未受伤的对照组进行比较：分析了 14 名参与者（n = 8 名 SCI 患者[除非另有说明]，中位年龄 = 44 岁；n = 6 名对照组，中位年龄 = 33 岁）。通过 fMRI 信号变化计算 CVR：结果显示，与对照组相比，SCI 参与者（n = 7）灰质中的 CVR 分量（tau）更长（中位数差异 = 3.0 秒；p < .05）。损伤后时间（TSI）与 SCI 参与者灰质和脑干的稳态 CVR 呈负相关（RS = -0.81，p = .014；RS = -0.84，p = .009）。SCI 组脑干中较低的稳态 CVR（n = 7）与较低的舒张压相关（RS = 0.76，p = .046）。低血压发作频率越高（n = 7），灰质（RS = -0.86，p = .014）和脑干（RS = -0.89，p = .007）的CVR结果越低：初步研究结果表明，SCI 组和非损伤对照组的动态 CVR 成分 tau 存在差异，这可能是 SCI 患者脑血管健康负担较重的原因。探索性关联表明，较长的TSI、较低的舒张压和较多的低血压发作可能会导致较差的CVR结果。然而，要确定因果关系并支持这些观察结果，还需要进一步的研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Topics in Spinal Cord Injury Rehabilitation REHABILITATION-

CiteScore

3.20

自引率

3.40%

发文量

期刊介绍： Now in our 22nd year as the leading interdisciplinary journal of SCI rehabilitation techniques and care. TSCIR is peer-reviewed, practical, and features one key topic per issue. Published topics include: mobility, sexuality, genitourinary, functional assessment, skin care, psychosocial, high tetraplegia, physical activity, pediatric, FES, sci/tbi, electronic medicine, orthotics, secondary conditions, research, aging, legal issues, women & sci, pain, environmental effects, life care planning