Hypotension
Conditions
Brief summary
The beach chair position for shoulder operation induces hypotension during general anesthesia. Hypotension is induced by decreased preload and contractility due to anesthesia. Masimo is a pulse oximetry which shows pleth variability index noninvasively. The pleth variability may predict the hypotension during beach chair position.
Detailed description
The beach chair position for shoulder operation induces hypotension during general anesthesia. Hypotension is induced by decreased preload and contractility due to anesthesia. Masimo is a pulse oximetry which shows pleth variability index noninvasively. The investigators put the masimo probe before general anesthesia and recorded the values before and after beach chair position, The values include arterial pressure, heart rate, blood pressure, perfusion index, pleth variability index. The primary end point was the predictive value and threshold or pleth variability index for hypotension induced by the beach chair position. The occurrence of hypotension was counted by using vasopressor. The use of vasopressor was performed when mean blood pressure less than 65 mmHg or 20% of baseline. The investigators planned to recruit 57 patients.
Interventions
DEVICEPleth
apply the masimo probe on index fingertip and record the pleth variability and blood pressure during beach chair position
Sponsors
Chung-Ang University Hosptial, Chung-Ang University College of Medicine
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
20 Years to 70 Years
Healthy volunteers
No
Inclusion criteria
* elective shoulder surgery under general anesthesia
Exclusion criteria
* right heart failure * morbid obesity (BMI \> 30) * arrhythmia on preoperative electrocardiography * pulmonary hypertension * peripheral vascular disease or pulmonary disease * pregnant
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| occurrence of hypotension defined as mean blood pressure less than 65 mmHg or 20% of baseline | 10 minutes after beach chair position | hypotension occurs or not after beach chair position and hypotension was defined as mean blood pressure less than 65 mmHg or 20% of baseline |
Countries
South Korea
Contacts
Primary ContactYong-Hee Park, M.D.
Backup ContactChongwha Baek, Ph.D.
Outcome results
None listed