Pituitary Tumor
Conditions
Brief summary
Investigators hypothesized that propofol dose for pituitary somatotroph patients might differ from nonfunctioning pituitary tumor, and investigators will evaluate a target controlled infusion (TCI) effect site concentration (Ce) of propofol for BIS score of 40 and LOC (loss of consciousness) in pituitary somatotroph patients in comparison with non functioning pituitary tumor patients. On arrival in the operating room, standard monitoring devices, including electrocardiogram, pulse oximetry, noninvasive blood pressure cuff, and bispectral index (BIS) will be applied to the patients. Propofol with the modified Marsh pharmacokinetic parameters using a keo of 1.2/min will be administered through TCI pump (OrchestraBase Primea, Fresenius Vial, France). The initial target Ce of propofol will be chosen as 3.0 mg/mL (0.5 mg/mL of incremental size) based on an earlier study. The sedation of patients will be assessed with BIS score and the modified observer's assessment of awareness and sedation (OAA/S). LOC was defined as an OAA/S lower than 2 (loss of response to spoken command to eye opening and loss of response to mild prodding or shaking). The primary end point of this study is the Ce of propofol when the BIS score is 40. The secondary end point of this study is the Ce of propofol at LOC.
Interventions
PROCEDURENot applicable (measuring subject's effect site concentration of propofol during the induction of general anesthesia)
The patients of two cohort group will undergo general anesthesia in the same way and therefore there is no intervention in this study.
Sponsors
Yonsei University
Study design
Observational model
CASE_CONTROL
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
19 Years to No maximum
Inclusion criteria
* patients with pituitary somatotroph tumor and with nonfunctioning pituitary tumor in transsphenoidal pituitary surgery * American society of anesthesiologists classification 1 or 2
Exclusion criteria
* left ventricle ejection fraction \< 55% 3RD degree AV block, 2nd degree AV block with P:QRS \> 3:1 * serum Creatinine \> 1.0mg/dl * myocardial infarction or cerebral stroke in 1 yrs * fever \> 38C * dementia, cognitive disorder, confused mental status * pregnant patients * allergic to propofol * illiteracy or foreigners
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| effect site concentration of propofol | 5 minutes after subject's anesthesia induction | Investigators will assess the propofol requirement in pituitary tumor patients during the induction of general anesthesia when subject's BIS (Bispectral Index Score) is 40 |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| effect site concentration of propofol | 2 minutes after subject's anesthesia induction | Investigators will assess the propofol requirement in pituitary tumor patients during the induction of general anesthesia when the pituitary tumor patients lose their consciousness. |
Countries
South Korea
Outcome results
None listed