Introducing a free-breathing MRI method to assess peri-operative myocardial oxygenation and function: A volunteer cohort study.

IF 4.2 2区 医学 Q1 ANESTHESIOLOGY European Journal of Anaesthesiology Pub Date : 2024-07-01 Epub Date: 2024-02-06 DOI:10.1097/EJA.0000000000001964
Dominik P Guensch, Christoph D Utz, Bernd Jung, Scilla Dozio, Stefan P Huettenmoser, Jan O Friess, Sandra Terbeck, Gabor Erdoes, Adrian T Huber, Balthasar Eberle, Kady Fischer
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引用次数: 0

Abstract

Background: Induction of general anaesthesia has many potential triggers for peri-operative myocardial ischaemia including the acute disturbance of blood gases that frequently follows alterations in breathing and ventilation patterns. Free-breathing oxygenation-sensitive cardiovascular magnetic resonance (OS-CMR) imaging may provide the opportunity to continuously quantify the impact of such triggers on myocardial oxygenation.

Objective: To investigate the impact of breathing patterns that simulate induction of general anaesthesia on myocardial oxygenation in awake healthy adults using continuous OS-CMR imaging.

Design: Prospective observational study.

Setting: Single-centre university hospital. Recruitment from August 2020 to January 2022.

Participants: Thirty-two healthy volunteers younger than 45 years old were recruited. Data were analysed from n  = 29 (69% male individuals).

Intervention: Participants performed a simulated induction breathing manoeuvre consisting of 2.5 min paced breathing with a respiration rate of 14 breaths per minute, followed by 5 deep breaths, then apnoea for up to 60s inside a magnetic resonance imaging scanner (MRI). Cardiac images were acquired with the traditional OS-CMR sequence (OS bh-cine ), which requires apnoea for acquisition and with two free-breathing OS-CMR sequences: a high-resolution single-shot sequence (OS fb-ss ) and a real-time cine sequence (OS fb-rtcine ).

Main outcome measures: Myocardial oxygenation response at the end of the paced breathing period and at the 30 s timepoint during the subsequent apnoea, reflecting the time of successful intubation in a clinical setting.

Results: The paced breathing followed by five deep breaths significantly reduced myocardial oxygenation, which was observed with all three techniques (OS bh-cine -6.0 ± 2.6%, OS fb-ss -12.0 ± 5.9%, OS fb-rtcine -5.4 ± 7.0%, all P  < 0.05). The subsequent vasodilating stimulus of apnoea then significantly increased myocardial oxygenation (OS bh-cine 6.8 ± 3.1%, OS fb-ss 8.4 ± 5.6%, OS fb-rtcine 15.7 ± 10.0%, all P  < 0.01). The free-breathing sequences were reproducible and were not inferior to the original sequence for any stage.

Conclusion: Breathing manoeuvres simulating induction of general anaesthesia cause dynamic alterations of myocardial oxygenation in young volunteers, which can be quantified continuously with free-breathing OS-CMR. Introducing these new imaging techniques into peri-operative studies may throw new light into the mechanisms of peri-operative perturbations of myocardial tissue oxygenation and ischaemia.

Visual abstract: http://links.lww.com/EJA/A922.

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采用自由呼吸磁共振成像方法评估围手术期心肌氧合和功能:志愿者队列研究。
背景:全身麻醉诱导有许多可能导致围手术期心肌缺血的潜在诱因,包括呼吸和通气模式改变后经常出现的急性血气紊乱。自由呼吸氧合敏感心血管磁共振成像(OS-CMR)可持续量化此类诱因对心肌氧合的影响:利用连续的 OS-CMR 成像研究模拟全身麻醉诱导的呼吸模式对清醒的健康成年人心肌氧合的影响:设计:前瞻性观察研究:单中心大学医院。招募时间:2020 年 8 月至 2022 年 1 月:招募 32 名 45 岁以下的健康志愿者。对 n = 29(69% 为男性)的数据进行了分析:参与者在磁共振成像扫描仪(MRI)内进行模拟诱导呼吸操作,包括 2.5 分钟的有节奏呼吸,呼吸频率为每分钟 14 次,随后进行 5 次深呼吸,然后呼吸暂停长达 60 秒。心脏图像采用传统的OS-CMR序列(OSbh-cine)和两种自由呼吸OS-CMR序列采集,前者需要呼吸暂停,后者则需要呼吸暂停:高分辨率单次序列(OSfb-ss)和实时cine序列(OSfb-rtcine):主要结果测量指标:起搏呼吸结束时的心肌氧合反应和随后呼吸暂停时的 30 秒时间点的心肌氧合反应,这反映了临床环境中成功插管的时间:结果:起搏呼吸后的五次深呼吸显著降低了心肌氧合,这在所有三种技术中都能观察到(OSbh-cine -6.0 ± 2.6%,OSfb-ss -12.0 ± 5.9%,OSfb-rtcine -5.4 ± 7.0%,均为 P 结论:模拟起搏呼吸的呼吸动作能显著降低心肌氧合,这在所有三种技术中都能观察到:模拟全身麻醉诱导的呼吸动作会引起年轻志愿者心肌氧合的动态变化,可通过自由呼吸 OS-CMR 对其进行连续量化。将这些新的成像技术引入围手术期研究可能会为围手术期心肌组织氧合和缺血扰动的机制带来新的启示。Visualabstract: http://links.lww.com/EJA/A922.
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来源期刊
CiteScore
6.90
自引率
11.10%
发文量
351
审稿时长
6-12 weeks
期刊介绍: The European Journal of Anaesthesiology (EJA) publishes original work of high scientific quality in the field of anaesthesiology, pain, emergency medicine and intensive care. Preference is given to experimental work or clinical observation in man, and to laboratory work of clinical relevance. The journal also publishes commissioned reviews by an authority, editorials, invited commentaries, special articles, pro and con debates, and short reports (correspondences, case reports, short reports of clinical studies).
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