Perfusion Index and Spinal Hypotension in Day-Case Knee Arthroscopy
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: Hypotension, Spinal Anesthesia Induced Hypotension, Anesthesia, Spinal, Arthroscopy. Basic parameters: 18 years — 65 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Turkey (Türkiye)
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Predictive Value of Baseline Perfusion Index for Spinal Anesthesia-Induced Hypotension in Healthy Patients Undergoing Knee Arthroscopy: A Prospective Observational Trial
Overview
This prospective observational study aims to investigate the role of the baseline perfusion index (PI) in predicting spinal anesthesia-induced hypotension (SAIH) in ASA I-II patients undergoing day-case knee arthroscopy. Spinal anesthesia is a widely preferred technique for lower extremity surgeries, including knee arthroscopy. However, sympathetic blockade during spinal anesthesia frequently leads to significant hemodynamic instability, particularly hypotension, which can result in adverse perioperative outcomes. While age and baseline blood pressure are traditional risk factors, they often fail to accurately predict the onset of hypotension in healthy populations. The perfusion index (PI), a non-invasive parameter measured via pulse oximetry, reflects peripheral vascular tone and baseline sympathetic activity. An elevated baseline PI indicates baseline vasodilation and a higher susceptibility to sympathectomy, potentially offering an early and non-invasive prediction of SAIH before the hemodynamic collapse occurs. The primary outcome of the study is the incidence of spinal anesthesia-induced hypotension (defined as a mean arterial pressure \< 65 mmHg or a decrease in systolic blood pressure \> 25% from baseline). Secondary outcomes include the onset time of sensory block, and intraoperative ephedrine and fluid requirements.
Primary outcome measures
- Spinal anesthesia-induced hypotension [Time frame: During the surgery]
Secondary outcome measures (2)
- Investigation of Sensory Block Kinetics [Time frame: Periprocedural]
- Vasopressor Consumption [Time frame: During the surgery]
Eligibility criteria
Inclusion criteria
- Between the ages of 18-65
- Having an ASA Score of I-II
- Including data collection of parts that underwent knee arthroscopy
Exclusion criteria
- Patients under 18 and over 65 years of age
- Patients with ASA Score III and above
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
Turkey (Türkiye) · 1 center
- Ankara Etlik City Hospital — Ankara
Identifiers
NCT: NCT07747441 · AEŞH-EK-2026-171