Can Carotid Artery Doppler Variations Induced by End-expiratory Occlusion Manoeuvre Predict Fluid Responsiveness in Septic Shock Patients?
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 20
- 试验地点
- 2
- 主要终点
- Fluid responsiveness
研究概览
简要总结
Fluid responsiveness prediction prior to fluid challenge administration is a topic of interest, which has been extensively investigated, but remains challenging.
In clinical practice, functional hemodynamic tests (FHT) consisting of maneuvers that affect cardiac function and/or heart-lung interaction, have been introduced in order to identify fluid responders and non-responders without fluid challenge administration.
Changes in cardiac output induced by the Passive Leg Raising (PLR) test reliably predicted the increase in cardiac output to volume expansion. New approaches have been recently developed based on changes in respiratory dynamics, such as a transient increase in tidal volume, or a lung recruitment maneuver or an end-expiratory occlusion (EEO) test. The EEO leaded to an increase in venous return, cardiac preload and stroke volume in preload-responsive patients. The authors found that an increase in cardiac output ≥ 5% during a 15-s EEO reliably predicted its response to a 500-ml saline infusion.
However, in order to identify the rapid and transient increase in cardiac index during the EEO, continuous and instantaneous cardiac output monitoring is necessary. Pulse contour analysis methods provide a beat-to-beat estimation of cardiac output and had been used in most of studies validating the EEO test.
Carotid doppler is a non-invasive, bedside, easy to use ultrasound technique that measuring blood flow peak velocity (CDPV) and duration of systolic component of each cardiac cycle (from the onset to dicrotic notch- Flow time - FT) allows a reliable estimation of fluid status and could be an interesting alternative to track changes in SV and cardiac output.
详细描述
The aim of the present study is to investigate whether changes in systolic peak velocity (ΔV peak-CA) and in flow time (ΔFT) using carotid artery Doppler during an End-Expiratory Occlusion Test (EEOT) predict fluid responsiveness in patients with septic shock and lung protective mechanical ventilation in ICU.
All patients will be in supine position (trunk elevated 30°), sedated, paralyzed and mechanically ventilated in the volume control mode. Tidal volume will be set at 6-8 ml/kg of predicted body weight.
They will be all monitored by an EV1000TM/Volume View (Edwards Lifesciences Corporation, Irvine, CA 92614) for measurement of cardiac index through transpulmonary thermodilution (TPTD) and pulse contour analysis. Cardiac index and the other hemodynamic parameters derived from pulse contour analysis will be continuously recorded over a 20-sec period.
Phase 1 (baseline): a first set of TPTD will be performed to assess the cardiac index (CI), the stroke volume index (SVI), the stroke volume variation (SVV), the systemic vascular resistance index (SVRI). The mean arterial pressure (MAP), heart rate (HR), central venous pressure (CVP) were also recorded. A carotid doppler was performed to measure the systolic peak velocity (CDPV) and the flow time (FT) (see below).
Phase 2 (EEOT): A 20-second EEO will be than applied through a touch of ventilator for measuring the total end-expiratory pressure. MAP, HR, SVI, CVP, SVRI, pulse contour-derived CI were averaged during the 5 last seconds of the EEO because the maximal hemodynamic effects of the occlusion were observed at this time and because the EV1000TM monitor updates the data every 20 seconds. During this pause a carotid Doppler will be performed and the last 5 seconds will be recorded.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Sequential
- 主要目的
- Diagnostic
- 盲法
- None
入排标准
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •sedated and mechanically ventilated patients
- •need a fluid challenge
- •hypotension defined as a systolic arterial pressure ≤90 mmHg
- •tachycardia ≥100 beats/min
- •urinary flow ≤0.5 mL/kg/min for 2 hrs
- •Exclusion criteria:
- •age< 18 y old
- •significant valvular heart diseases
- •cardiac arrhythmia
- •peripheral arterial disease
- •common carotid artery stenosis greater than 50%
- •spontaneous breathing.
排除标准
- 未提供
结局指标
主要结局
Fluid responsiveness
时间窗: during EEOT
Evaluation of changes in systolic peak velocity (ΔV peak-CA) and in flow time (ΔFT) using carotid artery Doppler during an end-expiratory occlusion test and after fluid-challenge (500 ml)
次要结局
未报告次要终点
研究者
D'ARRIGO SONIA
principal investigator
Fondazione Policlinico Universitario Agostino Gemelli IRCCS