Previous articleTable of Contents Next article

TECHNICAL REPORT
Year : 2009  |  Volume : 3  |  Issue : 2  |  Page : 91-93

Neuroanesthesia management of neurosurgery of brain stem tumor requiring neurophysiology monitoring in an iMRI OT setting


1 Department of Neurosurgery, Neuroscience Center (020007), King Fahd Medical City, PO Box - 59046, Riyadh - 115 25, Saudi Arabia
2 Department of Neurology and Neurophysiology, Neuroscience Center (020007), King Fahd Medical City, PO Box - 59046, Riyadh - 115 25, Saudi Arabia
3 Department of Anesthesia, Neuroscience Center (020007), King Fahd Medical City, PO Box - 59046, Riyadh - 115 25, Saudi Arabia

Correspondence Address:
Mohamad SM Takrouri
Anesthesia Department, King Fahad Medical City, PO Box 59046, Mecca Road Riyadh 115 25
Saudi Arabia
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1658-354X.57877

Rights and Permissions
Date of Web Publication27-Nov-2009
 

  Abstract 

This report describes a rare case of ventrally exophytic pontine glioma describing operative and neuroanesthesia management. The combination of intraoperative neuromonitoring was used. It constituted: Brain stem evoked responses/potentials, Motor EP: recording from cranial nerve supplied muscle, and Sensory EP: Medial/tibial. Excision of the tumor was done with intra-operative magnatic resonance imaging (iMRI), which is considered a new modality.

Keywords: Brain stem, brainSUITE® intra-operative magnetic resonance imaging operating theater, evoked responses/potentials, neuromonitoring, neuroanesthesia, Motor EP: Recording from cranial nerve supplied muscle, Sensory EP: Medial/tibial


How to cite this article:
Sabbagh AJ, Al-Yamany M, Bunyan RF, Takrouri MS, Radwan SM. Neuroanesthesia management of neurosurgery of brain stem tumor requiring neurophysiology monitoring in an iMRI OT setting. Saudi J Anaesth 2009;3:91-3

How to cite this URL:
Sabbagh AJ, Al-Yamany M, Bunyan RF, Takrouri MS, Radwan SM. Neuroanesthesia management of neurosurgery of brain stem tumor requiring neurophysiology monitoring in an iMRI OT setting. Saudi J Anaesth [serial online] 2009 [cited 2019 Jan 19];3:91-3. Available from: http://www.saudija.org/text.asp?2009/3/2/91/57877


  Introduction Top


This case report describes the operative and neuroanesthesia management of a rare case of ventrally exophytic pontine glioma. It was guided by a new intraoperative neuromonitoring, which demanded some modifications in anesthesia management, such as, elimination of muscle relaxants and certain drugs used in neuroanesthesia.

Also the presence in the special environment of the brainSUITE® intra-operative magnetic resonance imaging operating theater (iMRI OT) demands magnetic precautions and close monitoring of the patient's welfare.


  Case Report Top


A six-year-old healthy boy, who was born at term, with normal development, presented to the emergency room with a headache and some unsteady gait. The parents mentioned that he had an abnormal eye movement on the right side. On examination, this child showed evidence of partial sixth nerve palsy on the right side and some ataxia while walking, but the rest of his neurological examination was normal. He had no papilledema.

The CT scan and MRI showed a lesion occupying most of the anterior pons. It was ventrally exophytic, extending inferiorly; hypodense on CT brain. The lesion surrounded completely, encased a part of the vertebral-basilar junction, and had a component that was enhanced with gadolinium infusion [Figure 1].

Discussion between the pediatric neurosurgeon (AJS)and skull base surgeon (MY) addressed the possibility of approaching this tumor through several options [1],[2],[3],[4],[5],[6],[7],[8],[9],[10] namely:

  1. transorally
  2. transnasally
  3. subtemporally
  4. transtentorially
  5. far lateral retrosigmoid approach
  6. a modified trans petrosal presigmoid approach


The decision was to take option (f) with the help of neurophysiology monitoring and iMRI; two surgical stages were planned the first was to do modified petresectomy and the second to resect the tumor.

On the day of the surgery the neurophysiologists set up electrodes necessary for neuromonitoring. Electrocardiogram (ECG), non-invasive blood pressure (NIBP), pulse oximetry, and core temperature were monitored during the operation. After pre-oxygenation, anesthesia was induced with the Propfol 3 mg/kg (Body weight 28 kg) Fentanyl 3 μg/kg Rocuoronium 0.6 mg/kg sequence, followed by endotracheal intubation and artificial ventilation, using air: Oxygen mixture carrying sevoflurane 2.5% was reduced to 0.6-2% through the procedure. Invasive monitoring was installed using an aseptic technique. The anesthesia was then maintained with continuous infusions of Propofol 5 mg/kg/h and Fentanyl at the rate of 2 μg/kg/h.

The surgical technique included insertion of a lumbar drain, the use of 3D reconstruction navigation CT scan images, integrated with navigation MRI sequences at T 1 , which were performed in order to get a pre-sigmoid approach to the brain stem. During this procedure, motor and sensory evoke potentials and direct stimulation were used to monitor the facial and trigeminal nerves and the brain stem. On coming very close to the facial canal, the semicircular canals, and the inner ear, the drilling was stopped; that was done as the first stage. The skin was closed and the patient was sent to the Intensive Care Unit (ICU) after extubation. The next day, the second stage was done in the brainSUITE® , with intraoperative MRI facility. Neuromonitoring with sensory and motor evoked potentials and direct stimulation was performed.

The dura was opened pre-sigmoidally and the cerebellum was retracted posteriorly, and a very small and tight corridor was maintained. It was performed after completing a pre-op MRI and navigation using T 2 and T 1, with contrast integrated neuronavigation. The cranial nerves V, VII, VIII, IX, X, and XI were seen laterally draping the tumor. VI was encased by the tumor. Very carefully the cranial nerves were dissected from the tumor, pushed up and down the tumor. The rest of the tissue was tested by direct stimulation, which was negative. By suctioning and careful easy aspiration 10% of the exophytic part of the tumor was removed. At each stage of tumor removal, direct stimulation was performed and the surgeon came closer to the actual pons, and more sensory and motor evoke potentials were tested. An intraoperative MRI was performed and renewal of registration and navigation was completed, as also further resection of the tumor was performed. The surgeons had excellent neuromonitoring without negative neurological changes and actual improvement of the sensory and motor evoked potentials. The final MRI showed around 70% removal of the tumor, which made the surgeons stop at that point. Postoperatively the lumbar drain that was placed before the first surgery was kept, and placed to drain 10- 15 cc of cerebrospinal fluid (CSF) per hour. Intravenous antibiotics were kept on board until the lumbar drain was removed seven days later.

The patient had no new neurological deficits postoperatively, except that the partial sixth nerve palsy that was present preoperatively continued. The patient had a fast recovery with physiotherapy and occupational therapy and was discharged home after having a discussion with the radiation oncologist and the pediatric oncologist, who had decided, on the ground of final pathology grading of highly malignant tumor, to have further radiation. It was decided to follow-up the patient with an MRI in three months and six months time, consecutively.


  Discussion Top


The initial experience at King Fahad Medical City Neurosciences Center in surgery of modified posterior resection of ventrally exophytic pontine glioma, provided the use new intraoperative neuromonitoring, which constituted: Brain Stem Evoked Responses/potentials (BAER), Motor EP: Recording from cranial nerve supplied muscle (MER), and Sensory EP: Medial/Tibial (SEP).

The anesthesia technique adapted for this new demand of two extensive lengths of surgery was done in two sessions, summing up to 30 hours of surgical work and 48 hours of Surgical Intensive Care Unit (SICU) care.

The neuroanesthesia administered was basically dependent on a combination of Total Intravenous Anesthesia (TIVA) infusion of propofol and fentanyl with fine adjustment of sevoflurane, to allow for a motionless patient and proper neuromonitoring, especially during surgical stimulation, as per the progress in this session. TIVA with propofol and fentanyl or other short-acting narcotics appeared to be well suited and to a lesser extent similar to sevoflurane, during neuromonitoring. [11],[12],[13],[14],[15],[16],[17],[18],[19],[20],[21],[22]

The other basic monitoring constituted the measurement of central venous pressure and continuous intra-arterial pressure. The new adaptation of our technique is to allow intraoperative magnetic resonance (iMRI), which neccessitates using long tubing to conduct the respiratory gases and for the inhalational anesthetics to be supplied to the patient, to allow the patient to enter the MRI vault during surgery. Tubing for monitoring and IV fluid management was elongated too. Extra care was given to the special requirement of positioning the head in a shield and under coverage, away from the direct control of the anesthesiologists, during an iMRI session.


  Conclusion Top


This patient was a very rare case of ventrally exophytic pontine tumor, where a subtotal removal was successfully performed. It was through a modified posterior Petrosectomy for a fronto-lateral approach to the pons, with careful and very meticulous dissection of the lower cranial nerves (V, VI, VII, VIII, IX, X, XI, VII).

The time taken for this rare surgical procedure was 30 hours. Prolonged anesthesia time 38 hours in two stages (surgery monitoring of Brain Stem/MRI session). The advantage of prolonged anesthesia using TIVA was quick recovery and allowing evoked potential recording without using muscle relaxants, as also adapting techniques and precautions to avoid complications of long anesthesia in prone position namely: Airway obstruction by mucus plug or kinking of endotracheal tube, pressure sores, difficult extubation, and facial edema.

Team work in the brainSUITE® area (surgeon, anesthetist, and neurologist) is essential for the smooth running of this complicated surgery.


  Acknowledgment Top


This article was conducted in Brainsuite at KFMC with the support of Dr. Asaad Al-Asaad Chairman of Operating Room Theaters and Chairman of the Department of Anesthesia, at King Fahad Medical City. Help received from the neuro nursing team and the assistant technicians at the Anesthesia Department is appreciated.

 
  References Top

1.Bruno L, Schut L. Survey of Paediatric Brain Tumors American Association of Neurological Surgeons: Paediatric. Surgery of Developing Nervous System. New York: Grune Stratton; 1982. p. 361-5.  Back to cited text no. 1      
2.Farwell JR, Dohrmann GJ, Flannery JT. Center Nervous System Tumors in Children. Cancer 1977;40:3123-32.  Back to cited text no. 2  [PUBMED]  [FULLTEXT]  
3.Konovalov AN, Gorelyshev SK, Khuhlaeva EA. Surgical management of brain stem salamic and have salamic tumors, Chapter 58 Roberts DW, Operative Neurosurgical Techniques, Indications, Methods, and Results. Sounders; 2006. p. 821- 56.  Back to cited text no. 3      
4.Maxon DD. Neurosurgery of Infancy and Childhood. 2 nd ed. Springfield Thomas; 1969. p. 469-77.  Back to cited text no. 4      
5.Pool JL. Glioma in the region of the brain stem. J Neurosurg 1968;29:164-7.  Back to cited text no. 5  [PUBMED]  [FULLTEXT]  
6.Epstein F, McCleary EL: Intrinsic brain tumor in childhood: Surgical indications. J Neurosurg 1986;64:11-5.  Back to cited text no. 6      
7.Epstein FJ, Farmer JP. Brain stem glioma growth patterns. J Neurosurg 1993;78:408-12.  Back to cited text no. 7  [PUBMED]  [FULLTEXT]  
8.Epstein FJ, Farmer JP, Konovalov AN, Farmer JP, Montes JL, Freeman CR, et al. Brain stem glioma′s a 10-year institutional review pediatr neurosurg 2001;34:206-14.  Back to cited text no. 8      
9.Deltramello A, Lombado MC, Massoto B, Bricolo A, Mortora N, Deletis V, et al. Brain stem mapping, neurophysiological localization of motor nuclea on the floor of the fourth ventricle. Neurosurgery 1995;37:922-30.  Back to cited text no. 9      
10.Strauss C, Romstock J, Nimsky C: Intraoperative identification of motor areas of the rhomboid fossa using direct stimulation. J Neurosurg 1993;79:393-9.  Back to cited text no. 10      
11.Samantaray A, Rao HM. Comparative effects of propofol infusion versus sevoflurane for maintenance of anesthesia for spine surgery. Int J Anesthesiol 2007;11:2-3.  Back to cited text no. 11      
12.Talke P, Caldwell JE, Brown R, Dodson B, Howley J, Richardson CA. A comparison of three anesthetic techniques in patients undergoing craniotomy for supratentorial intracranial surgery. Anesth Analg 2002;95:430-5.  Back to cited text no. 12  [PUBMED]  [FULLTEXT]  
13.Jellish WS, Lien CA, Fontenot HJ, Hall R. The comparative effects of sevoflurane versus propofol in the induction and maintenance of anesthesia in adult patients. Anesth Analg 1996;82:479-85.  Back to cited text no. 13  [PUBMED]  [FULLTEXT]  
14.Claeys MA, Gepts E, Camu F. Hemodynamic changes in anesthesia induced and maintained with propofol. Br J Anesth 1983;60:3.  Back to cited text no. 14      
15.Khanna MS, Sarha V. A comparative evaluation of 1% and 2% propofol as sole intravenous anesthetic agent for short surgical procedures. J Anesth Clin Pharmacol 2002;18:87-90.  Back to cited text no. 15      
16.Ozkose Z, Ercan B, Unal Y, Yardim S, Kaymaz M, Dogulu F, et al. Inhalation versus total intravenous anesthesia for lumbar disc herniation. Comparison of hemodynamic effects, recovery characteristics and cost. J Neurosurg Anesthesiol 2001;13:296-302.  Back to cited text no. 16      
17.Ku AS, Hu Y, Irwin MG, Chow B, Gunawardene S, Tan EE, et al. Effects of sevoflurane/nitrous oxide versus propofol anesthesia on somatosensory evoked potential monitoring of the spinal cord during surgery to correct scoliosis. Br J Anesth 2002;88:502-7.  Back to cited text no. 17      
18.Coates DP, Monk CR, Prys-Roberts C, Turtle M. Hemodynamic effects of the infusion of the emulsion formulation of propofol during nitrous oxide anesthesia in humans. Anesth Analg 1987;66:64-70.  Back to cited text no. 18  [PUBMED]  [FULLTEXT]  
19.Stephan H, Sonntag H, Schenk HD, Kettler D, Khambatta HJ. Effects of propofol on cardiovascular dynamics, myocardial blood flow and myocardial metabolism in patients with coronary artery disease. Br J Anesth 1986;58:969-75.  Back to cited text no. 19      
20.Patrick MR, Blair IJ, Feneck RO, Sebel PS. A comparison of hemodynamic effects of propofol and thiopentone in patients with coronary artery disease. Postgrad Med J 1985;61:23-7.  Back to cited text no. 20      
21.Vermeyen KM, Erpels FA, Janssen LA, Beeckman CP, Hanegreefs GH. Propofol fentanyl anesthesia for coronary artery bypass surgery in patients with good left ventricular function. Br J Anaesth 1987;59:115-20.  Back to cited text no. 21      
22.Takrouri MM, Saqer MI, Al-Banyan A. Respiratory difficulties encountered during posterior fossa exploration. Saudi J Anaesth [serial online] 2009 [cited 2009 Nov 13];3:39-40. from: www.saudija.org/text.asp?2009/3/1/39/51834 .  Back to cited text no. 22      


    Figures

  [Figure 1]



 

Top
 
Previous article Next article
 
  Search
 
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
    Access Statistics
    Email Alert *
    Add to My List *
* Registration required (free)  

 
  IN THIS Article
   Abstract
   Introduction
   Case Report
   Discussion
   Conclusion
   Acknowledgment
   References
   Article Figures

 Article Access Statistics
    Viewed6363    
    Printed205    
    Emailed12    
    PDF Downloaded790    
    Comments [Add]    

Recommend this journal