Dichrotic Notch Positioning in Finger Photoplethysmography Waveform Reflex Systemic Vascular Resistance
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 发起方
- 入组人数
- 15
- 试验地点
- 2
- 主要终点
- Analysis in the position of the dichrotic notch between photoplethysmogram and spectral Doppler waveforms.
研究概览
简要总结
Changes in the vascular tone of anesthetized patients is common and cause hemodynamic problems. The investigators have previously demonstrated that the shape of the pulse oximetry waveform (photoplethysmography) is closely related to the changes observed in systemic vascular resistence. The main change in pulse waveform is based to the dichrotic notch position. The present study was designed to determine if the dichrotic notch position is related to a local or a systemic change in the vascular tone.
详细描述
This is a prospective and observational study designed to determine if the changes observed in finger photoplethysmographic waveform of surgical patients is related to a local or a sistemic changes in the vascular tone. The investigators will studied 15 patients undergoing regional brachial plexus anesthesia for upper limb surgeries. Photoplethysmography will be continuously recorded in the thumb of the tested hand (anesthetized hand) and in the thumb of the control, opposite hand. Duplex color and power Doppler will measure flow in the both brachial arteries and in the aorta (supraesternal view). The contour analysis of both, photoplethysmogram and arterial flow velocities will be analyzed, correlated and compared.
研究设计
- 研究类型
- Observational
- 观察模型
- Case Only
- 时间视角
- Prospective
入排标准
- 年龄范围
- 20 Years 至 60 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Written Inform Consent
- •Programmed surgery
- •Supine position
排除标准
- •Emergency surgery
- •Peripheral vascular diseases
结局指标
主要结局
Analysis in the position of the dichrotic notch between photoplethysmogram and spectral Doppler waveforms.
时间窗: 4 hours
The position of the dichrotic notch of pulse waveform in photoplethysmogram (time arrival of diastolic wave expressed in seconds) was compared to the one observed in the spectral Doppler waveform (seconds).
次要结局
未报告次要终点