Tactile feedback exceeds visual feedback to display tissue slippage in a laparoscopic grasper.

Virtual reality can help to learn basic laparoscopic tasks. However, no haptic feedback, which alerts for tissue slippage, is provided by most simulators, although, it might be of influence for the decrease of errors. This study explored whether visual or tactile feedback can be used to alert the surgeon of tissue slippage. Twenty-four participants performed a laparoscopic grasping task and where provided with either visual or tactile feedback about tissue slippage. The reaction time with the visual feedback was compared to the reaction time with tactile feedback signal. The results showed that when tissue slippage is simulated, tactile feedback shows significant faster reaction times (269ms) than visual feedback signals (398ms).

Serum bone turnover markers (PINP and ICTP) for the early detection of bone metastases in patients with prostate cancer: a longitudinal approach.

PURPOSE: An increase in bone turnover markers in patients with prostate cancer may predict bone metastases but it can also reflect the effects of androgen deprivation treatment. To assess the diagnostic efficacy of early detection of skeletal metastases we retrospectively performed serial measurements of a bone formation marker (PINP) and a bone resorption marker (ICTP) in serum of patients with prostate cancer. MATERIALS AND METHODS: Residual serum samples from 64 patients with prostate cancer treated between 1999 and 2004 were selected from our prostate specific antigen serum archive, and divided into 3 groups of patients with no metastases (N0M0), with lymph node metastases only (N1M0) and with skeletal metastases (M1). In the M1 group the T(1) sample was collected near the first positive bone scintigraph. RESULTS: The N1M0 and M1 groups showed increased PINP levels (ANOVA T(0) p = 0.035, T(1) p <0.001). The PINP levels in the M1 group increased further (paired t test p = 0.028), while no increase was found in the other groups. There was no significant difference between the number of patients receiving androgen deprivation therapy in the N1M0 and the M1 groups. Increased PINP levels in the M1 group were detectable 8 months before the first positive bone scintigraph. The increase in ICTP in the M1 group differed significantly from the other groups (the Student t test in 45 patients p = 0.029). The increases in PINP and ICTP differentiated between patients with or without skeletal metastases (AUC 0.71, p = 0.002 and AUC 0.64, p = 0.045, respectively). CONCLUSIONS: Followup measurement of serum PINP and ICTP is useful in the early assessment of skeletal metastases in patients with prostate cancer regardless of the confounding role of androgen deprivation treatment. The bone formation marker is the most indicative.

[Severe diarrhoea with invasive intestinal spirochaetosis]. / Ernstige diarree met invasieve intestinale spirochetose.

A 38-year-old heterosexual male presented with a 6 to 7 week history of severe diarrhoea but no other complaints. In routine faecal cultures and routine parasitological investigations no pathogenic micro-organisms were observed. Colonoscopy revealed a normal mucosa. Multiple biopsies were obtained. The histological diagnosis was invasive intestinal spirochaetosis. The immunostain for Borrelia burgdorferi cross-reacted with the spirochetes of the intestinal spirochaetosis. After two weeks of incubation under strict anaerobic conditions a spirochaete was cultured from a biopsy of the sigmoid mucosa. The 16SrDNA sequence was consistent with Brachyspira aalborgi. The HIV and syphilis results were negative. The patient was treated first with metronidazole and then by clindamycin. The diarrhoea subsided after the second course of treatment and the cause was presumed to have been the invasive intestinal spirochaetosis. Intestinal spirochaetosis is usually found coincidentally at histological examination of colon biopsies. There is no general consensus that intestinal spirochaetosis is the cause of the diarrhoea. There is however an association between the presence of symptoms and the invasivity of spirochaetes, morphological colon epithelial changes and evidence of immune response. The literature reports patients who improve symptomatically without specific treatment. Treatment may be given to patients with severe symptoms.