Combining machine learning with knowledge-based modeling for scalable forecasting and subgrid-scale closure of large, complex, spatiotemporal systems.

We consider the commonly encountered situation (e.g., in weather forecast) where the goal is to predict the time evolution of a large, spatiotemporally chaotic dynamical system when we have access to both time series data of previous system states and an imperfect model of the full system dynamics.

Post-operative delirium is associated with increased 5-year mortality.

Background: Post-operative delirium is associated with increased short term morbidity and mortality. Limited data exists on long term outcomes for older adults with postoperative delirium. We hypothesize that postoperative delirium is associated with increased 5-year mortality.

Stray energy transfer during endoscopy.

Introduction: Endoscopy is the standard tool for the evaluation and treatment of gastrointestinal disorders. While the risk of complication is low, the use of energy devices can increase complications by 100-fold. The mechanism of increased injury and presence of stray energy is unknown.

Intraoperative lymphatic mapping for non-small cell lung cancer: the sentinel node technique.

Background: The purpose of the study was to determine the accuracy and role of the sentinel node technique in patients with non-small cell lung cancer.

Methods: This study was carried out on 36 consecutive patients undergoing lung resection. Peritumoral tissue was infiltrated with isosulfan blue dye and the first lymph node to stain was identified as a sentinel node.

Problem orientation is a new approach to surgical education.

Background: There is increasing interest in educational methods that are loosely aggregated under the title of problem-based learning (PBL), but it remains unclear whether PBL is as successful as its conventional predecessor in transmitting factual information.

Materials And Methods: The authors designed and implemented a PBL curriculum for a third-year surgical clerkship, then prospectively compared that technique with the conventional format. Each student's subject-related knowledge was assessed with a specifically tailored 195-question written exam and correlated with National Board of Medical Examiners shelf exams.

Treatment of bleeding stomal varices. Report of a case and review of the literature.

Variceal bleeding from ileostomy, colostomy, or ileal conduit stomas is unusual. There is no consensus on which of the various treatment options is best. A case of bleeding ileostomy varices is presented.