Fast FFT-based bioheat transfer equation computation

This paper describes a modeling method of the tissue temperature evolution over time in hyper or hypothermia. The tissue temperature evolution over time is classically described by Pennes’ bioheat transfer equation which is generally solved by a finite difference method. In this paper we will present a method where the bioheat transfer equation can be algebraically solved after a Fourier transformation over the space coordinates. As an example, we implemented this method for the simulation of a percutaneous high intensity ultrasound hepatocellular carcinoma curative treatment and compared it with the finite difference method and experimental data.     

Styles of emotion regulation and their associations with perceived health in patients with rheumatoid arthritis

Background: Patients with rheumatoid arthritis face the challenge of adjusting to adverse health consequences and accompanying emotions. Styles of emotion regulation may affect health.Purpose: The objective is to examine associations between styles of emotion regulation and perceived health, consisting of psychological well-being, social functioning, physical functioning, and disease activity.Methods: Principal component analysis was used to summarize styles of emotion regulation of 335 patients with rheumatoid arthritis. Relationships between emotion regulation and perceived health were examined with structural equation modeling.Results: Four styles of emotion regulation were identified: ambiguity, control, orientation, and expression. Ambiguity and control were mutually correlated, as were orientation and expression. Styles of emotion regulation were not uniquely related to perceived physical functioning and disease activity. Emotional ambiguity and orientation were related to poorer, whereas expression and control were related to more favorable psychological well-being and social functioning.Conclusions: Our cross-sectional study suggests that emotion regulation is not of direct importance for perceived somatic health of patients with rheumatoid arthritis, but it may be of importance for psychological well-being and social functioning, and perhaps through this route for somatic health. The more conscious and controlled aspects of control and expression are positively related to psychosocial health, and the more unconscious automatic aspects of ambiguity and orientation are negatively related. Changing emotion regulation will potentially affect psychosocial health. It would be worthwhile to verify this possibility in prospective research. This study was financially supported by the Dutch Arthritis Association. We thank all rheumatologists and rheumatology nurses of the Arthritis Research Foundation Utrecht (SRU) for recruitment of participants. We also thank Bert Garssen and the reviewers and editor of this journal for their valuable comments and suggestions on previous drafts of the article.     

Psychosocial Functioning Before and After Laparoscopic Adjustable Gastric Banding: a Cross-Sectional Study

Background: The aim of this cross-sectional study was to examine short and long-term physical, mental and, particularly, social quality of life (QoL) of patients with severe obesity after laparoscopic adjustable gastric banding (LAGB). Methods: 250 patients (221 female, 29 male, mean age 39.6 years, age range 22-61) filled out questionnaires to evaluate several aspects of QoL: 93 patients before LAGB, 48 with a follow-up duration of 8 through 24 months, and 109 patients 25 through 68 months after LAGB. Results: Compared with patients before surgery, patients after surgery, in both follow-up groups, had lower weight and co-morbidity, felt and functioned better on physical and psychological dimensions of QoL, and on most aspects of social QoL. No significant differences emerged between the two postoperative groups. On average, the postoperative QoL was still lower than the age norm group. Mutual correlations between QoL and weight outcome were very low up to 2 years after surgery, but more strongly associated >2 years after surgery. Conclusion: LAGB could be a long-term solution to morbid obesity with regard to both weight and QoL outcome. The findings of our study emphasize the importance of including social QoL variables in outcome research. They further suggest that when the follow-up duration increases, especially in patients who are single, intervention and consultation should be simultaneously directed at weight and psychosocial variables.     

Back to Basics: Hand Hygiene and Surgical Hand Antisepsis

Health care–associated infections (HAIs) are a significant issue in the United States and throughout the world, but following proper hand hygiene practices is the most effective and least expensive way to prevent HAIs. Hand hygiene is inexpensive and protects patients and health care personnel alike. The four general types of hand hygiene that should be performed in the perioperative environment are washing hands that are visibly soiled, hand hygiene using alcohol-based products, surgical hand scrubs, and surgical hand scrubs using an alcohol-based surgical hand rub product. Barriers to proper hand hygiene may include not thinking about it, forgetting, skin irritation, a lack of role models, or a lack of a safety culture. One strategy for improving hand hygiene practices is monitoring hand hygiene as part of a quality improvement project, but the most important aspect for perioperative team members is to set an example for other team members by following proper hand hygiene practices and reminding each other to perform hand hygiene.