Journal of neurosurgical anesthesiology
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Postoperative visual loss occurs more commonly in patients placed prone. The mechanism may be raised intraocular pressure (IOP) causing an ischemic oculopathy. ⋯ IOP increases when anesthetized patients are placed in the prone position.
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J Neurosurg Anesthesiol · Oct 2004
Randomized Controlled Trial Clinical TrialEffect of preoperative dexamethasone on edema of oral and extra-oral structures following trans-oral decompression and posterior fusion.
We investigated the anti-edema effect of intravenous dexamethasone in a randomized, double-blinded, placebo-controlled study in 40 ASA physical status I and II patients scheduled for trans-oral decompression and posterior fusion. Patients were divided into two groups to receive either placebo or 10 mg dexamethasone one hour prior to induction of anesthesia. After anesthesia induction, oral structures were graded as swelling grade 0 at direct laryngoscopy. ⋯ Patients with swelling grades of 1 and 2 were extubated on each assessment. On statistical analysis of the results, the study found that in comparison to placebo, patients in the dexamethasone group were extubated earlier (P < 0.006, Chi Square for trend). Total duration of surgery and duration of posterior fusion were significantly greater (P < 0.05) in patients who had swelling grade >2 than in patients who had swelling grade < or =2 at completion of surgery (192.50 +/- 16.26, 356.07 +/- 17.06 minutes versus. 158.27 +/- 9.07, 311.41 +/- 14.06 minutes).
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J Neurosurg Anesthesiol · Oct 2004
Case ReportsTransient cardiac asystole in transsphenoidal pituitary surgery: a case report.
Unlike other cardiac arrhythmia, asystole during neurosurgical procedures is not reported in the literature. We describe such a case during transsphenoidal pituitary surgery in a patient who was not having any history of associated cardiac problems. Its possible cause in relation to the perioperative sequence of events has been discussed.
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J Neurosurg Anesthesiol · Oct 2004
Increased incidence of emergency airway management after combined anterior-posterior cervical spine surgery.
Among some kinds of cervical spine surgeries, combined anterior-posterior cervical spine surgery (CAP-CS surgery) requires prolonged operative time and highly invasive procedure. This study was performed to determine whether CAP-CS surgery was associated with increased risk of emergency airway management compared with other cervical spine surgeries (O-CS surgeries). The records of the patients who underwent cervical spine surgery between July 2001 and March 2003 at our institution were reviewed retrospectively, and we determined whether the CAP-CS surgery was associated with an increased risk of emergency airway management in comparison with O-CS surgeries, using the logistic regression analysis. ⋯ Postoperative emergency airway management was required in 7 of the 10 patients (70%) who underwent CAP-CS surgery, and 2 of the 155 patients (1%) who underwent O-CS surgeries. The increased risk of postoperative emergency airway management imposed by CAP-CS surgery was 178.5 by an odds ratio, with a 95% confidence interval of 25.6 to 1246. The results show that CAP-CS surgery provides a major risk factor for postoperative emergency airway management.
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J Neurosurg Anesthesiol · Oct 2004
Clinical TrialECG artifacts during intraoperative high-field MRI scanning.
High-field magnetic resonance imaging (MRI) (1.5 T) has recently been introduced into the neurosurgical operating room for intraoperative resection control and functional neuronavigational guidance. However, long-lasting neurosurgical procedures in an operating room equipped with a high-field MRI scanner raise new challenges to the anesthesiologist. In particular, monitoring of vital signs during anesthesia requires equipment compatible with working in close vicinity to the strong magnetic field. ⋯ As shown in this study, pulsed high-frequency fields induce characteristic field frequency-based artifacts in the ECG that can imitate malignant arrhythmia or provoke ST-segment abnormalities. The knowledge of possible and characteristic ECG artifacts during high-field MRI is therefore essential to prevent misinterpretation. Moreover, interference-free parameters such as pulse oximetry or invasive blood pressure curves are highly relevant during intraoperative MRI scans.