Development of a Pharmacodynamic Model for Propofol in Older Adults
NCT ID: NCT05790720
Last Updated: 2025-05-31
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
Get a concise snapshot of the trial, including recruitment status, study phase, enrollment targets, and key timeline milestones.
RECRUITING
NA
60 participants
INTERVENTIONAL
2024-06-01
2025-08-01
Brief Summary
Review the sponsor-provided synopsis that highlights what the study is about and why it is being conducted.
* Evaluate the relationship between the plasmatic concentration, described by the Eleveld pharmacokinetic model, versus the effect of the drug represented with a new parameter derived from the intraoperative frontal EEG.
* To validate the predictive ability of Eleveld's pharmacokinetic-pharmacodynamic model, based on the bispectral index (BIS), compared to the new model based on a parameter derived from intraoperative frontal EEG.
Participants will be asked to answer preoperative questionnaires, receive a Propofol intravenous infusion concomitantly with continuous BIS and EEG monitoring, and to be evaluated for clinical sings of loss and return of consciousness.
Related Clinical Trials
Explore similar clinical trials based on study characteristics and research focus.
Performance Evaluation of Four Pharmacokinetic-Pharmacodynamic(PKPD) Models of Propofol in Elderly Patients
NCT01435785
Validation of a Pharmacokinetic Pharmacodynamic Model to Administer Propofol in Obese Patients
NCT01596387
Dose-response Curves Between Propofol and Intraoperative Electroencephalographic Patterns
NCT04345926
Synchronous Effect of Anesthetics on fMRI, EEG and Clinical Responses
NCT03928366
Propofol Effect-Site Target Controlled Infusion in the Obese: Characterization of the Time Profile of Bispectral Index Response
NCT01665079
Detailed Description
Dive into the extended narrative that explains the scientific background, objectives, and procedures in greater depth.
One way in which an attempt has been made to make the doses of anesthetics in different patients comparable is the use of models that predict what infusion rate is required to maintain a given concentration at the site of drug action. The relationship between a propofol effect site concentration (Ce) with a given effect can be represented by pharmacodynamic (PD) models. Recently, Eleveld et al. created a pharmacokinetic-pharmacodynamic (PKPD) model for the administration of intravenous propofol in a population of wide ages, including neonates to older patients. However, the pharmacodynamic parameter used in this model was the BIS index, which has been questioned for its use in older adults. In addition, the creation of this PD model only included 3 patients older than 70 years, so the underrepresentation of this age group in the construction of the model could affect its performance, making it even more difficult to correctly predict the effect in this population.
Anesthetic drugs exert their desired hypnotic effect on the brain. Brain electrical activity can be monitored non-invasively by recording electrical potential on the cranial surface using electrodes. The electroencephalographic (EEG) changes observed with the administration of anesthetics are usually systematic across different patients. These have been described and have been used to identify different phases of anesthetic "depth" or hypnosis. In addition, the representation of the EEG signal by means of a spectrogram has facilitated the incorporation of this information into commercial EEG monitors that previously only included highly processed indices such as the BIS.
Within the EEG patterns of the spectrogram described for anesthetic maintenance with propofol, the alpha (8-12 Hz) and delta (1-4 Hz) oscillations stand out. However, the power of alpha oscillations decreases with age and with other changes that are associated with age, such as decreased cognitive ability, increased comorbidities and brain vulnerability. Therefore, guiding our administration of propofol based on obtaining a pattern of alpha predominance appears to be difficult in this aged population.
The general objective of this work is to build a PKPD model that uses the pharmacokinetic parameters of the Eleveld model and new pharmacodynamic parameters derived from the frontal EEG in a population older than 65 years. Our hypothesis is that the Eleveld PKPD model, modified with this new pharmacodynamic parameter, will predict better the hypnotic effect of propofol than the original Eleveld PKPD model, in adult patients older than 65 years.
The creation of a PKPD model of propofol for the population over 65 years of age would allow a better titration of this drug to avoid possible deleterious effects secondary to its under or overdosage.
Conditions
See the medical conditions and disease areas that this research is targeting or investigating.
Study Design
Understand how the trial is structured, including allocation methods, masking strategies, primary purpose, and other design elements.
NA
SINGLE_GROUP
TREATMENT
NONE
Study Groups
Review each arm or cohort in the study, along with the interventions and objectives associated with them.
Intervention
Patients older than 65 years of age will receive an intravenous infusion of Propofol with prespecified plasma targets. During its administration, registration of BIS values, frontal electroencephalography, and clinical signs of consciousness will be performed. Two models will be created and compared retrospectively: BIS (Eleveld Validation) and EEG Frontal Marker (New model).
Propofol
Patients older than 65 years of age will receive an intravenous infusion of Propofol with prespecified plasma targets. During its administration, registration of BIS values, frontal electroencephalography, and clinical signs of consciousness will be performed.
Interventions
Learn about the drugs, procedures, or behavioral strategies being tested and how they are applied within this trial.
Propofol
Patients older than 65 years of age will receive an intravenous infusion of Propofol with prespecified plasma targets. During its administration, registration of BIS values, frontal electroencephalography, and clinical signs of consciousness will be performed.
Eligibility Criteria
Check the participation requirements, including inclusion and exclusion rules, age limits, and whether healthy volunteers are accepted.
Inclusion Criteria
* American Society of Anesthesiologists Physical Status I to III
Exclusion Criteria
* Neurosurgical patients
* History of alcohol abuse or recreational drug use
* Known allergie to Propofol
* Body mass index ≥ 35 Kg m-2
* Unstable heart failure
65 Years
99 Years
ALL
No
Sponsors
Meet the organizations funding or collaborating on the study and learn about their roles.
Pontificia Universidad Catolica de Chile
OTHER
Responsible Party
Identify the individual or organization who holds primary responsibility for the study information submitted to regulators.
Locations
Explore where the study is taking place and check the recruitment status at each participating site.
Pontificia Universidad Católica de Chile
Santiago, Santiago Metropolitan, Chile
Countries
Review the countries where the study has at least one active or historical site.
Central Contacts
Reach out to these primary contacts for questions about participation or study logistics.
Facility Contacts
Find local site contact details for specific facilities participating in the trial.
References
Explore related publications, articles, or registry entries linked to this study.
Schnider TW, Minto CF, Shafer SL, Gambus PL, Andresen C, Goodale DB, Youngs EJ. The influence of age on propofol pharmacodynamics. Anesthesiology. 1999 Jun;90(6):1502-16. doi: 10.1097/00000542-199906000-00003.
Andres TM, McGrane T, McEvoy MD, Allen BFS. Geriatric Pharmacology: An Update. Anesthesiol Clin. 2019 Sep;37(3):475-492. doi: 10.1016/j.anclin.2019.04.007. Epub 2019 Jun 19.
Vuyk J. Pharmacodynamics in the elderly. Best Pract Res Clin Anaesthesiol. 2003 Jun;17(2):207-18. doi: 10.1016/s1521-6896(03)00008-9.
Roy RC. Choosing general versus regional anesthesia for the elderly. Anesthesiol Clin North Am. 2000 Mar;18(1):91-104, vii. doi: 10.1016/s0889-8537(05)70151-6.
Warner MA, Saletel RA, Schroeder DR, Warner DO, Offord KP, Gray DT. Outcomes of anesthesia and surgery in people 100 years of age and older. J Am Geriatr Soc. 1998 Aug;46(8):988-93. doi: 10.1111/j.1532-5415.1998.tb02754.x.
Eleveld DJ, Colin P, Absalom AR, Struys MMRF. Pharmacokinetic-pharmacodynamic model for propofol for broad application in anaesthesia and sedation. Br J Anaesth. 2018 May;120(5):942-959. doi: 10.1016/j.bja.2018.01.018. Epub 2018 Mar 12.
Brown EN, Lydic R, Schiff ND. General anesthesia, sleep, and coma. N Engl J Med. 2010 Dec 30;363(27):2638-50. doi: 10.1056/NEJMra0808281. No abstract available.
Purdon PL, Sampson A, Pavone KJ, Brown EN. Clinical Electroencephalography for Anesthesiologists: Part I: Background and Basic Signatures. Anesthesiology. 2015 Oct;123(4):937-60. doi: 10.1097/ALN.0000000000000841.
Kim MC, Fricchione GL, Brown EN, Akeju O. Role of electroencephalogram oscillations and the spectrogram in monitoring anaesthesia. BJA Educ. 2020 May;20(5):166-172. doi: 10.1016/j.bjae.2020.01.004. Epub 2020 Feb 20. No abstract available.
Purdon PL, Pierce ET, Mukamel EA, Prerau MJ, Walsh JL, Wong KF, Salazar-Gomez AF, Harrell PG, Sampson AL, Cimenser A, Ching S, Kopell NJ, Tavares-Stoeckel C, Habeeb K, Merhar R, Brown EN. Electroencephalogram signatures of loss and recovery of consciousness from propofol. Proc Natl Acad Sci U S A. 2013 Mar 19;110(12):E1142-51. doi: 10.1073/pnas.1221180110. Epub 2013 Mar 4.
Purdon PL, Pavone KJ, Akeju O, Smith AC, Sampson AL, Lee J, Zhou DW, Solt K, Brown EN. The Ageing Brain: Age-dependent changes in the electroencephalogram during propofol and sevoflurane general anaesthesia. Br J Anaesth. 2015 Jul;115 Suppl 1(Suppl 1):i46-i57. doi: 10.1093/bja/aev213.
Giattino CM, Gardner JE, Sbahi FM, Roberts KC, Cooter M, Moretti E, Browndyke JN, Mathew JP, Woldorff MG, Berger M; MADCO-PC Investigators. Intraoperative Frontal Alpha-Band Power Correlates with Preoperative Neurocognitive Function in Older Adults. Front Syst Neurosci. 2017 May 8;11:24. doi: 10.3389/fnsys.2017.00024. eCollection 2017.
Touchard C, Cartailler J, Leve C, Serrano J, Sabbagh D, Manquat E, Joachim J, Mateo J, Gayat E, Engemann D, Vallee F. Propofol Requirement and EEG Alpha Band Power During General Anesthesia Provide Complementary Views on Preoperative Cognitive Decline. Front Aging Neurosci. 2020 Nov 27;12:593320. doi: 10.3389/fnagi.2020.593320. eCollection 2020.
Kaiser HA, Hirschi T, Sleigh C, Reineke D, Hartwich V, Stucki M, Rummel C, Sleigh J, Hight D. Comorbidity-dependent changes in alpha and broadband electroencephalogram power during general anaesthesia for cardiac surgery. Br J Anaesth. 2020 Oct;125(4):456-465. doi: 10.1016/j.bja.2020.06.054. Epub 2020 Jul 31.
Shao YR, Kahali P, Houle TT, Deng H, Colvin C, Dickerson BC, Brown EN, Purdon PL. Low Frontal Alpha Power Is Associated With the Propensity for Burst Suppression: An Electroencephalogram Phenotype for a "Vulnerable Brain". Anesth Analg. 2020 Nov;131(5):1529-1539. doi: 10.1213/ANE.0000000000004781.
Other Identifiers
Review additional registry numbers or institutional identifiers associated with this trial.
230125002
Identifier Type: -
Identifier Source: org_study_id
More Related Trials
Additional clinical trials that may be relevant based on similarity analysis.