Intraoperative Goal-directed Fluid Management in Lean and Obese Patients
试验速览
- 阶段
- 不适用
- 状态
- 撤回
- 试验地点
- 2
- 主要终点
- To develop a statistical equation based on the BMI (Body Mass Index) that predicts fluid requirements in individuals scheduled for elective, open abdominal surgeries, vaginal hysterectomies or genital prolapse repair .
研究概览
简要总结
The investigators propose to determine esophageal Doppler goal-directed fluid requirements in lean, overweight, obese, and morbidly obese patients with the goal of developing a body mass index (BMI)-specific fluid replacement strategy. Specifically, th investigators will test the hypothesis that perioperative fluid requirements on a per-kg basis varies as a function of BMI. Individuals scheduled for elective, open abdominal surgeries, vaginal hysterectomies or genital prolapse repair will be eligible to participate
详细描述
Recent evidence suggests that goal-directed fluid management using stroke volume (blood ejected by the heart) is the most physiologic approach for fluid replacement. We propose to develop a body mass index (BMI)-specific fluid replacement formula based on stroke volume guidance.
Arterial pulse pressure variation (dPP) induced by mechanical ventilation is a proposed predictor of fluid responsiveness as well. We will therefore also investigate if stroke volume (measured by esophageal Doppler monitoring) and pulse pressure variation comparably predict fluid responsiveness by simultaneously measuring both parameters.
Adequate tissue oxygenation is essential to maintain normal physiologic functions. Fat tissue oxygenation is critically low in the obese surgical patient. It is likely that poor fat tissue oxygenation results in part from inadequate fluid replacement. We propose to determine if fat tissue oxygenation is comparable from lean to morbidly obese patients when fluid replacement is optimized.
Individuals scheduled for elective, open abdominal surgeries, vaginal hysterectomies or genital prolapse repair will be assigned to six groups according to BMI, from lean to morbidly obese categories. The primary aim will be to develop a statistical equation for predicting fluid requirements as a function of BMI. A maximum of 100 patients will be able to detect an R-squared of 10% or more with 90% power at the 0.05 significance level, and will enable adequate estimation of the relationship of interest.
研究设计
- 研究类型
- Interventional
- 分配方式
- Non Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 85 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Women, aged > 18 years old
- •Scheduled for elective, open abdominal or vaginal hysterectomies.
- •Patients will be recruited in the following body mass index categories:
- •18.5-24.9 BMI [kg/m2]
- •25.0-29.9 BMI [kg/m2]
- •30.0-34.9 BMI [kg/m2]
- •35.0-39.9 BMI [kg/m2]
- •40.0-44.9 BMI [kg/m2]
- •> 45 BMI [kg/m2]
排除标准
- •Hysterectomies due to gynecologic cancer diagnosis
- •Signs and/or symptoms of decompensate heart failure
- •End-stage renal disease
- •History of susceptibility to malignant hyperthermia or porphyria
- •Esophageal disease (excepting gastro-esophageal reflux without any other esophageal alteration)
结局指标
主要结局
To develop a statistical equation based on the BMI (Body Mass Index) that predicts fluid requirements in individuals scheduled for elective, open abdominal surgeries, vaginal hysterectomies or genital prolapse repair .
时间窗: July, 2009
次要结局
- To identify whether tissue oxygenation is similar in lean, overweight, obese and morbidly obese patients when perioperative fluid management is optimized.(July, 2008)