Performance Evaluation of Four Pharmacokinetic-Pharmacodynamic(PKPD) Models of Propofol in Elderly Patients (TCIGeriatric)

Universidad del Desarrollo

Status: Completed

Conditions: Propofol Overdose of Undetermined Intent

Study type: Observational

Funder types: Other

Identifiers

NCT01435785

Propofol TCI in Geriatric

Details and patient eligibility

About

Despite the wide use of propofol target-controlled infusion (TCI) in elderly patients, pharmacokinetic (PK) and pharmacodynamic (PD) models performance has not been prospectively assessed in this population. The aims of this study are to derive four PKPD models using previously published PK parameters sets, and to prospectively assess their performance in elderly people. With the obtained data we propose to build a specific PKPD model for this population.

Full description

After BIS® and routine monitors were placed, 14 ASA I-II elderly patients (>65 yr) will be anesthetized with plasma TCI of propofol based on Schnider model. After partial recovery from a bolus dose a remifentanil infusion was started and continued throughout surgery. All BIS and TCI data will be continuously record. Arterial blood samples for propofol assays were collected at 1, 2, 3, 5, 10, 20, 40 and 60 min post-induction, and at 0, 1, 3, 5, and 10 min after stopping the infusion. A three compartment effect site model linked to a Sigmoidal Emax PD model, will be used to fit all the data simultaneously in NONMEM. Median performance errors(MDPE), and median absolute performance errors(MDAPE) were calculated to measure bias and accuracy of each model. Comparisons between models will be performed.

Enrollment: 14 patients

Sex: All

Ages: 65+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Patients older than 65 years, ASA 1,2

Exclusion criteria

• Included less than 70% or more than 130% of ideal body weight
• Neurologic disorder
• Use of psychoactive medication, including alcohol intake during the last 48 hours