Electrocortical stimulation remains the standard for functional brain mapping of eloquent areas to prevent postoperative functional deficits. The aim of this study was to investigate whether the short-train technique (monopolar stimulation) and Penfield's technique (bipolar stimulation) would induce different effects on brain oscillatory activity in awake patients, as quantified by electrocorti...

INTRODUCTION The aim was to evaluate the postoperative morbidity and outcome of palliative endoscopic resections for relief of infravesical obstruction in prostate cancer patients with hormone deprivation therapy, and to investigate the added value of bipolar technology over conventional monopolar resections. MATERIAL AND METHODS A retrospective study was performed on 70 patients with prostat...

OBJECTIVE To evaluate the size of ovarian damage caused by ovarian drilling in polycystic ovary syndrome, the amount of inflicted damage was assessed for the most frequently used ovarian drilling techniques. DESIGN Experimental prospective design. SETTING University clinic. PATIENT(S) Six fresh bovine ovaries per technique. INTERVENTION(S) Carbon dioxide (CO(2)) laser, monopolar electro...

Activity in the central auditory system was mapped with 2-deoxyglucose (2-DG) autoradiography, using either pure tones or electrical stimulation of the normal cochlea. Electrical stimulation with both monopolar (distant reference electrode) and bipolar prostheses near threshold increased 2-DG uptake in auditory nuclei in a manner similar to that seen with a pure tone: increased 2-DG uptake was ...

OBJECTIVE To determine whether saline-enhanced dual probe bipolar radiofrequency ablation (RFA) using perfused-cooled electrodes shows better in-vitro efficiency than monopolar or single probe bipolar RFA in creating larger coagulation necrosis. MATERIALS AND METHODS RF was applied to excised bovine livers in both bipolar and monopolar modes using a 200 W generator (CC-3; Radionics) and the p...

We have proposed previously a kinetochore motor-polar ejection model for chromosome congression to the metaphase plate where forces generated at the kinetochore are antagonized by away-from-the pole forces generated within each half-spindle on the chromosome arms. This model was based in large part on observations of the behavior of chromosomes on monopolar spindles. In these cells chromosomes ...

High-frequency bipolar electric pulses have been shown to mitigate undesirable muscle contraction during irreversible electroporation (IRE) therapy. Here, we evaluate the potential applicability of such pulses for introducing exogenous molecules into cells, such as in electrochemotherapy (ECT). For this purpose we develop a method for calculating the time course of the effective permeability of...

The purpose of the present study was to evaluate the efficacy and safety of bipolar transurethral prostatectomy (TURP) using the Gyrus PlasmaKinetic System compared with conventional monopolar TURP. This study included 102 patients with benign prostatic hyperplasia (BPH) who underwent TURP from January 2003 to March 2005. In all, 49 consecutive patients had bipolar and 53 had monopolar TURP. Al...

INTRODUCTION Transurethral resection syndrome is an uncommon but potentially life threatening complication. Various irrigating solutions have been used, normal saline being the most physiological. The recent availability of bipolar cautery has permitted the use of normal saline irrigation. MATERIAL AND METHODS In a randomized prospective study, we compared the safety and efficacy of bipolar c...

OBJECTIVE To evaluate the efficacy and safety of bipolar transurethral resection of the prostate (TURP) in patients with a large prostate (>90 g), as a significant recent modification of TURP is the incorporation of bipolar technology, which uses the same technique as monopolar TURP but with normal saline as the irrigant. PATIENTS AND METHODS Forty patients with a prostate of >90 g and who we...