Articles: surgery.
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For this first of a two-part article, anesthetic treatment modalities and specific drugs administered for third molar extractions were assessed to determine current office-based therapeutic practices. Questionnaires were mailed to a random national sample of 850 practicing oral surgeons. Survey design and pilot testing was conducted to assure clarity of questions and usefulness of responses. ⋯ Practicing oral and maxillofacial surgeons were estimated to have performed an average of 52.7 third molar extraction surgery cases per month, using either general anesthesia (46.3%), intravenous conscious sedation (33.4%), nitrous oxide sedation (5.8%), oral sedation (1.7%), or local anesthesia alone (12.9%). For intravenous conscious sedation, a three-drug technique using midazolam, fentanyl, and propofol was reported most commonly. The most frequently selected local anesthetic formulations were 2% lidocaine, 1:100,000 epinephrine for surgical anesthesia and 0.5% bupivacaine, 1:200,000 epinephrine for postoperative pain management.
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IEEE Trans Med Imaging · Mar 2006
Self-calibrating 3D-ultrasound-based bone registration for minimally invasive orthopedic surgery.
Intraoperative freehand three-dimensional (3-D) ultrasound (3D-US) has been proposed as a noninvasive method for registering bones to a preoperative computed tomography image or computer-generated bone model during computer-aided orthopedic surgery (CAOS). In this technique, an US probe is tracked by a 3-D position sensor and acts as a percutaneous device for localizing the bone surface. ⋯ Using realistic US image data acquired from 6 femurs and 3 pelves of intact human cadavers, and accurate Gold Standard registration transformations calculated using bone-implanted fiducial markers, we show that self-calibrating registration is significantly more accurate than a standard method, yielding an average root mean squared target registration error of 1.6 mm. We conclude that self-calibrating registration results in significant improvements in registration accuracy for CAOS applications over conventional approaches where calibration parameters of the 3D-US system remain fixed to values determined using a preoperative phantom-based calibration.
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The contribution of MER to improving bilateral STN-DBS is debatable. To resolve the controversy and elucidate the role of MER in DBS, we compared the outcome of bilateral STN-DBS surgery with and without MER in parkinsonian patients. ⋯ Although STN-DBS is a promising surgical modality for advanced parkinsonian patients, there is an inevitable learning curve associated with adopting this new procedure. Intraoperative MER is an effective way to ensure correct electrode placement in the STN. With the assistance of intraoperative MER, the outcome of STN-DBS can be improved significantly.
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J. Oral Maxillofac. Surg. · Mar 2006
The influence of computed tomography motion artifacts on computer-assisted surgery.
Motion artifacts can significantly deteriorate the precision of a computer-assisted surgical intervention because they destroy the isometric representation of tomographic pictures. In the context of a study, the influence of typical motion artifacts on the precision of markerless laser registration in image-guided oral and maxillofacial surgery was analyzed, and quality factors for evaluation of the isometry of a computed tomography (CT) dataset were determined. ⋯ The isometry of a CT dataset should always be checked before performance of a computer assisted surgical intervention because anisometric datasets result in inaccurate patient registration and navigation.
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J Am Soc Echocardiogr · Feb 2006
Case ReportsIntracoronary stent visualized on transesophageal echocardiogram in a case of coronary dissection complicated by aortic dissection.
We present a case of a patient presenting with a myocardial infarction with subsequent coronary intervention resulting in a coronary dissection complicated by an aortic dissection. The coronary dissection was treated with coronary stents. Transesophageal echocardiogram visualized the intracoronary stent within the intimal flap of the aortic dissection. The aortic dissection was successfully managed conservatively.