Effect of Drugs Clinical Trial
Official title:
Comparative Effect of Hypotensive Anaesthesia Using Nitroglycerine vs Phentolamine on Event Related Potentials, Quantitative Electroencephalograghy and Cognitive Function in Patients Undergoing Septoplasty
AIM OF THE WORK The aim of this work was to compare the effect of hypotensive anaesthesia using Nitroglycerine versus phentolamine on Event related potentials, quantitative Electroencephalograghy and cognitive function, in patients undergoing septoplasty.
METHODS:
Study design and population: This is a pilot prospective randomized clinical trial that will
be carried out on 60 patients candidate for septoplasty subjected to general hypotensive
anaesthesia. The patients will be recruited from Ear, nose and throat surgery department,
Beni-Suef University Hospital. All the participants will be required to offer a written
informed consent
Sampling Technique:
Patients will be randomly assigned into one of two equal groups; the first group will receive
nitroglycerine (30 participants) (nitroglycerine group) and the second group will receive
phentolamine (30 participants) (phentolamine group). Randomization will be carried out using
a closed opaque envelope technique with the anesthetist will pick up a sealed envelope which
contains a paper with the name of the group to which the patient will be randomized is
written. Whichever the group written on the paper, the patient will be scheduled to it.
All included patients will be subjected to the following:
1) Cognitive assessment:
Cognitive functions for the patients will be assessed (preoperative and 1 week postoperative)
using the following psychometric tests:
1. Paired Associate Learning test (PALT) Aim: to assess auditory verbal memory. The test
uses the concept of semantic cueing
.
2. Benton Visual Retention test (BVRT) Aim: to assess visual perceptual, visual memory,
visual motor and visuoconstructive abilities.
2) Neurophysiological assessment: Digital Electroencephalograghy (EEG), quantitative
Electroencephalograghy (QEEG) and Event related potentials (ERPs) and will be done for all
included patients (preoperative and 1 week postoperative).
Statistical analysis The sample size will be calculated using G*Power version 3.1.9.2
Software based on this pilot study. The probability of type I error (α) will be 5%, and the
statistical power (1-β) should exceed 80%. The data will be coded and entered using: the
statistical package for social science version 15 (SPSS v 15). Descriptive statistics will be
reported as mean ± SD and number (%) for categorical variables. Student t- test will be used
for comparison between means of two unpaired groups of quantitative variables. Paired sample
t- test will be used for comparison between means of two paired groups of quantitative
variables. Chi square test will be used for comparison between two groups of categorical
data. Mixed ANOVA test will be used for comparing paired data in two unpaired groups. The
probability/significance value (P value) ≥ 0.05 is not statistically significant and <0.05 is
statistically significant.
;
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