Face and Construct Validity of a Novel Virtual Reality-Based Bimanual Laparoscopic Force-Skills Trainer With Haptics Feedback.

BACKGROUND: The purpose of this study was to examine the face and construct validity of a custom-developed bimanual laparoscopic force-skills trainer with haptics feedback. The study also examined the effect of handedness on fundamental and complex tasks. METHODS: Residents (n = 25) and surgeons (n = 25) performed virtual reality-based bimanual fundamental and complex tasks. Tool-tissue reaction forces were summed, recorded, and analysed. Seven different force-based measures and a 1-time measure were used as metrics. Subsequently, participants filled out face validity and demographic questionnaires. RESULTS: Residents and surgeons were positive on the design, workspace, and usefulness of the simulator. Construct validity results showed significant differences between residents and experts during the execution of fundamental and complex tasks. In both tasks, residents applied large forces with higher coefficient of variation and force jerks (P < .001). Experts, with their dominant hand, applied lower forces in complex tasks and higher forces in fundamental tasks (P < .001). The coefficients of force variation (CoV) of residents and experts were higher in complex tasks (P < .001). Strong correlations were observed between CoV and task time for fundamental (r = 0.70) and complex tasks (r = 0.85). Range of smoothness of force was higher for the non-dominant hand in both fundamental and complex tasks. CONCLUSIONS: The simulator was able to differentiate the force-skills of residents and surgeons, and objectively evaluate the effects of handedness on laparoscopic force-skills. Competency-based laparoscopic skills assessment curriculum should be updated to meet the requirements of bimanual force-based training.

Cancer of the gastroesophageal junction: a diagnosis, classification, and management review.

Management of gastroesophageal junction (GEJ) adenocarcinoma is a controversial topic. The rising incidence of this cancer requires a clear consensus to ensure proper management. Application of oncological principles for tumors of the esophagus or stomach is not possible because of comparative differences in the biology of GEJ adenocarcinoma, leading to different therapeutic options. Staging work-up with endoscopy, endosonography, and PET is essential to inform the choice of neoadjuvant treatment and surgical approach to GEJ adenocarcinoma. Surgery remains the only curative treatment and should be undertaken in specialized centers.

Nonerosive reflux disease: clinical concepts.

Esophageal symptoms can arise from gastroesophageal reflux disease (GERD) as well as other mucosal and motor processes, structural disease, and functional esophageal syndromes. GERD is the most common esophageal disorder, but diagnosis may not be straightforward when symptoms persist despite empiric acid suppressive therapy and when mucosal erosions are not seen on endoscopy (as for nonerosive reflux disease, NERD). Esophageal physiological tests (ambulatory pH or pH-impedance monitoring and manometry) can be of value in defining abnormal reflux burden and reflux-symptom association. NERD diagnosed on the basis of abnormal reflux burden on ambulatory reflux monitoring is associated with similar symptom response from antireflux therapy for erosive esophagitis. Acid suppression is the mainstay of therapy, and antireflux surgery has a definitive role in the management of persisting symptoms attributed to NERD, especially when the esophagogastric junction is compromised. Adjunctive approaches and complementary therapy may be of additional value in management. In this review, we describe the evaluation, diagnosis, differential diagnosis, and management of NERD.

Diagnosis, assessment, and management of surgical complications following esophagectomy.

Despite improvements in operative strategies for esophageal resection, anastomotic leaks, fistula, postoperative pulmonary complications, and chylothorax can occur. Our review seeks to identify potential risk factors, modalities for early diagnosis, and novel interventions that may ameliorate the potential adverse effects of these surgical complications following esophagectomy.

Dysphagia due to tuberculosis.

OBJECTIVE: Dysphagia due to tuberculosis is rare in both the developing countries with high prevalence rates and the western population following the recent upsurge linked to the AIDS and immigration. AIM: To study tuberculosis as an aetiological factor in the causation of dysphagia and to evaluate the outcome of anti-tubercular treatment and surgical results in these patients. METHODS: Retrospective review of experience with 14 cases of dysphagia due to tuberculosis encountered between 1996 and 2003. RESULTS: The duration of symptoms ranged between 3 and 18 months. All of them underwent oesophagogastroscopy, barium swallow, fiberoptic bronchoscopy and CT scan of the chest. The aetiology was subcarinal node enlargement in seven, tracheo-oesophageal fistula in four, oesophageal ulcer in two and cervical node suppuration in one. Tuberculous involvement was confirmed by pathological examination in all patients. All of them received anti-tuberculous therapy. Seven patients required surgery, transthoracic repair of tracheo-oesophageal fistula in four patients, one patient required subcarinal node excision and two needed abscess drainage. There were no mortalities and there was complete relief of dysphagia in all of them. CONCLUSIONS: Tuberculosis as a causative factor for dysphagia should be considered in regions with high incidences of tuberculosis and in immunocompromised patients. Treatment with anti-tuberculous therapy is effective. Surgery is required only for complications of tuberculosis.

Gastrocoele: a complication of combined oesophageal and antral corrosive strictures.

Corrosive strictures of the gastrointestinal tract are a surgical challenge. We describe a previously undescribed condition called gastrocoele, a rare condition caused by combined oesophageal and antral strictures and review our results. We present our experience with nine cases of gastrocoele due to combined corrosive strictures of oesophagus and antrum between 1993 and 2005. The age group was 21-65 years with female preponderant (66%) sex distribution. The presentation was at a median of 110 days (range 45-400 days) following the corrosive ingestion. The standard investigations included barium swallow, endoscopy, jejunostomy tubogram and barium enema. The surgical procedures performed were antrectomy and coloplasty in six (one staged), antrectomy and oesophageal dilatation in two and gastrojejunostomy and coloplasty in one. There was no major morbidity or mortality with a median follow-up of 3 years. Gastrocoele is a rare entity where good results can be achieved with surgery, however, prevention of corrosive injuries by public education is the best cure!