Effect of Aminophylline Bolus Versus Infusion on Recovery Time in Patients Undergoing Lumbar Spine Surgery

Effect of Aminophylline Bolus Versus Infusion on Recovery Time in Patients Undergoing Lumbar Spine Surgery: Double Blind Randomized Controlled Trial

To determine optimal dose, method and time of administration of aminophylline to enhance the recovery from general anesthesia.

andTo estimate the recovery time from isoflurane closure in each group. We hypothesize that starting administration of loading and maintenance dose of aminophylline half an hour before discontinuing isoflurane will shorten the duration needed to extubate patients undergoing lumbar disc surgery. We hypothesized that it will yield superior results compared to bolus administration after discontinuing isoflurane.

Study Overview

• Status: Recruiting
• Conditions: Anesthesia
• Intervention / Treatment: Drug: Aminophylline bolus then infusion; Drug: aminophylline bolus; Drug: normal saline

Detailed Description

• it is a randomized double blinded study
• Population of study:

Adult male and female patients undergoing single or double level lumbar disc laminectomy, discectomy and /or fixation.

recruitment of cases will be started after getting approval of ethical committee in our faculty (done and its number is N-56-2022/MD) and registration in clinicaltrials.gov and getting a unique number

- Study location: This study will be set at neurosurgery theater, kasr alainy Hospital, Cairo University.

• Methodology in details: On arrival to the operating room, standard monitoring equipment will be applied, including electrocardiography (ECG), automated non-invasive blood pressure (NIBP), pulse oximetry and baseline readings will be recorded. Peripheral IV access will be inserted. Antibiotic and antiemetic will be given preoperatively. Entropy (GE Entropy healthcare) monitoring which is a valuable tool for measuring depth of anesthesia will be used, Response entropy (RE) and state entropy (SE) will be monitored using specific entropy sensors that will be placed on the patient's forehead according to the manufacturer's instructions.
• No sedative premedication will be given. Induction of general anesthesia will be done by propofol 2-3mg/kg, fentanyl 2ug/kg and endotracheal intubation will be facilitated by atracurium 0.5 mg/kg. Anesthesia will be maintained by isoflurane 1.2 % and atracurium 0.1 mg/kg/30min, morphine 0.1 mg/kg I.V will be given for intra and post -operative analgesia .Near the end of the end of the surgery, the study population will be randomized to three groups.
• . Group A will receive aminophylline loading dose 5mg/kg on a 50 cm syringe using syringe pump over 5 minutes and maintenance dose 1.5 mg/kg/hr as a continuous infusion half an hour before discontinuation of isoflurane, and after discontinuation of isoflurane a 5 cm syringe of saline will be given over 5 minutes . Group B will receive a 50 cm syringe of saline using syringe pump over 5 minutes and maintenance continuous infusion of saline half an hour before discontinuation of isoflurane, and after discontinuation of isoflurane a 5cm syringe of aminophylline bolus 5mg\kg will be given over 5 minutes. On the other hand, group C will receive a 50 cm syringe of saline using syringe pump over 5 minutes and maintenance continuous infusion of saline half an hour before discontinuation of isoflurane, and after discontinuation of isoflurane a 5 cm syringe of saline will be given. These syringes will be prepared by an independent anesthesiologist and contain either aminophylline or a similar volume of normal saline. Recovery and data collection will be assessed by a second anesthesiologist who will not be aware of the group to which the patient will be allocated, also the patients will not know to which group they will be allocated. Entropy values, heart rate, blood pressure will be monitored in all patients before and every 5 minutes after injection of the test drug till half an hour after extubation. The following variables will be measured in all groups eye -opening in response to vocal request and time to extubation after discontinuation of anesthetic agent.
• Entropy will be used to monitor the depth of anesthesia using frontal electromyography through measuring irregularity of signals. High entropy values indicate high irregularity of signals which signifies that the patient is awake. A more regular signal produce low entropy values which can be associated with low probability of consciousness, so we will use it to assess the speed of return of conscious level after discontinuation of isoflurane.
• At the end of surgery, anesthetic gases will be discontinued and patients will be ventilated with 100% O2. For the antagonism of muscle relaxation, neostigmine 0.05mg/kg and atropine 0.01mg/kg will be given

sample size :

Power analysis was performed using one-way ANOVA test to detect at least 20% difference in time to extubation as the primary outcome of our study. Based on previous study(10); the mean ± SD time to extubation in the single shot aminophylline group was 6.6 ± 2.47 minutes.

At an α error of 0.05 and power of 0.8. A minimum of 93 patients was calculated. The sample will be increased 99 patients (33 patients per arm) for the possible dropouts. Sample size was calculated using G*Power 3 software.

11- Statistical analysis

The statistical package for the social sciences version 23 (SPSS, Inc, Chicago, IL, USA) will be used for statistical analysis. Descriptive statistics will be done for quantitative data by mean & standard deviation (SD), while they are done for categorical data by number and percentage. Studies will be done to calculate the inter and intra-observer variability. The level of significance is taken at P value<0.05 to exclude false positive results

• Study Type: Interventional
• Enrollment (Anticipated): 33
• Phase: Phase 4

Contacts and Locations

• Study Contact: Name: Ahmed H. Sayed, M.D; Phone Number: +201068112464; Email: drahmedhusseinanesth87@gmail.com
• Study Contact Backup: Name: Rania s. Fahmy, M.D; Phone Number: +201270820372; Email: ransam98@gmail.com

Study Locations

• Egypt
  • Cairo, Egypt, 11562
    • Recruiting
    • Kasr Alainy
    • Contact: Ahmed H. Sayed, M.D; Phone Number: +201068112464; Email: drahmedhusseinanesth87@gmail.com
    • Contact: Rania s. Fahmy, M.D; Phone Number: +21270820372; Email: ransam98@gmail.com

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 21 years to 50 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

ASA I-II. 20-50 years old patients. Both sexes Patients undergoing single or double level lumbar laminectomy ,discectomy and/or fixation

Exclusion Criteria:

Contraindications to the use of aminophylline as cardiac patients, patients with renal impairment, hepatic dysfunction, hypo or hyperthyroidism and epilepsy.

Patients who have hypersensitivity to aminophylline Emergency operations. Operative time exceeding 5 hours

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Supportive Care
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: group A; will receive aminophylline loading dose 5mg/kg on a 50 cm syringe using syringe pump over 5 minutes and maintenance dose 1.5 mg/kg/hr as a continuous infusion half an hour before discontinuation of isoflurane, and after discontinuation of isoflurane a 5 cm syringe of saline will be given over 5 minutes	Drug: Aminophylline bolus then infusion; half an hour before discontinuation of isoflurane
Active Comparator: group B; will receive a 50 cm syringe of saline using syringe pump over 5 minutes and maintenance continuous infusion of saline half an hour before discontinuation of isoflurane, and after discontinuation of isoflurane a 5cm syringe of aminophylline bolus 5mg\kg will be given over 5 minutes	Drug: aminophylline bolus; after discontinuation of isoflurane
Placebo Comparator: group C; will receive a 50 cm syringe of saline using syringe pump over 5 minutes and maintenance continuous infusion of saline half an hour before discontinuation of isoflurane, and after discontinuation of isoflurane a 5 cm syringe of saline will be given	Drug: normal saline; given as placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Recovery time	Time to extubation from closure of isoflurane to extubation in minutes	one hour

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Response entropy (RE)	after induction of anesthesia, every 30 minutes throughout the operation and every 5 minutes after injection of the test drug and till half an hour after extubation	4 hours
State entropy (SE)	after induction of anesthesia, every 30 minutes throughout the operation, every 5minutes after injection of the test drug half an hour after extubation.	4 hours
Mean arterial blood pressure	base line after induction of anesthesia, every 30 minutes throughout the operation, every 5 minutes after injection of the test drug and half an hour after extubation.	4 hours
heart rate	base line after induction of anesthesia, every 30 minutes throughout the operation, every 5 minutes after injection of the test drug and half an hour after extubation.	4 hours
The total dose of aminophylline	in mg in groups A and B	two hours
The incidence of side effects	as chest pain ,fainting, persistent vomiting, rapid pulse, arrhythmias and seizure within 24 hours	24 hours

Collaborators and Investigators

• Sponsor: Cairo University

Publications and helpful links

General Publications

• El Tahan MR. Effects of aminophylline on cognitive recovery after sevoflurane anesthesia. J Anesth. 2011 Oct;25(5):648-56. doi: 10.1007/s00540-011-1190-8. Epub 2011 Jul 14.
• Elsarrag M, Soldozy S, Patel P, Norat P, Sokolowski JD, Park MS, Tvrdik P, Kalani MYS. Enhanced recovery after spine surgery: a systematic review. Neurosurg Focus. 2019 Apr 1;46(4):E3. doi: 10.3171/2019.1.FOCUS18700.
• Wang Q, Fong R, Mason P, Fox AP, Xie Z. Caffeine accelerates recovery from general anesthesia. J Neurophysiol. 2014 Mar;111(6):1331-40. doi: 10.1152/jn.00792.2013. Epub 2013 Dec 26.
• Ghaffaripour S, Khosravi MB, Rahimi A, Sahmedini MA, Chohedri A, Mahmoudi H, Kazemi MR. The effects of Aminophylline on clinical recovery and bispectral index in patients anesthetized with total intravenous anaesthesia. Pak J Med Sci. 2014 Nov-Dec;30(6):1351-5. doi: 10.12669/pjms.306.5853.
• Wang HL, Tang SH, Wang XQ, Gong WH, Liu XM, Lei WF. Doxapram hastens the recovery following total intravenous anesthesia with dexmedetomidine, propofol and remifentanil. Exp Ther Med. 2015 Apr;9(4):1518-1522. doi: 10.3892/etm.2015.2249. Epub 2015 Feb 2.

Study record dates

Study Major Dates

• Study Start (Actual): December 30, 2022
• Primary Completion (Anticipated): June 30, 2023
• Study Completion (Anticipated): July 30, 2023

Study Registration Dates

• First Submitted: November 14, 2022
• First Submitted That Met QC Criteria: December 15, 2022
• First Posted (Actual): December 19, 2022

Study Record Updates

• Last Update Posted (Estimate): January 4, 2023
• Last Update Submitted That Met QC Criteria: December 30, 2022
• Last Verified: December 1, 2022

More Information

Terms related to this study

• Keywords: recovery time; aminophylline; time of extubation
• Additional Relevant MeSH Terms: Physiological Effects of Drugs; Neurotransmitter Agents; Molecular Mechanisms of Pharmacological Action; Autonomic Agents; Peripheral Nervous System Agents; Enzyme Inhibitors; Purinergic Antagonists; Purinergic Agents; Protective Agents; Cardiotonic Agents; Bronchodilator Agents; Anti-Asthmatic Agents; Respiratory System Agents; Phosphodiesterase Inhibitors; Purinergic P1 Receptor Antagonists; Aminophylline
• Other Study ID Numbers: N-56-2022/MD

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No