Publications

Current methods including the use of various biological and synthetic sealants are ineffective in the closure of intraoperative air leaks that often occur during cardiothoracic surgeries, resulting in a decreased quality of life for patients. We present the development of a novel lung air leak sealant using tissue engineered cell sheets. In contrast to previous materials such as fibrin glue, these bioengineered cell sheets immediately and permanently seal air leaks in a dynamic fashion that allows for the extensive tissue contraction and expansion involved in respiration, without any postoperative recurrences. Additionally, we demonstrate that mesothelial cells migrate to cover the transplanted cells sheets, thereby confirming excellent biocompatibility and integration with the host tissues. Finally, we present the use of skin fibroblasts as an effective and readily available autologous cell source that can be easily applied. This study shows for the first time, the development of an immediate and permanent lung air leak sealant, suitable for future clinical applications.

OBJECTIVES

We investigated associations between tobacco industry denormalization attitudes and the smoking behavior of young adults (aged 18 to 29 years).

METHODS

We analyzed data from 9455 young adults in the 2002 California Tobacco Survey.

RESULTS

The data showed that 27.4% of young adults were "ever smokers" (smoked > or = 100 cigarettes in their lifetime), of whom 66.9% were current smokers (18.3% of young adults). Denormalization attitudes formed 2 major factors: support for anti-tobacco industry action and mistrust of tobacco companies. In multivariate logistic regression, support for action against the tobacco industry was negatively associated with current smoking (odds ratio [OR] = 0.16; 95% confidence interval [CI]=0.13, 0.19) and susceptibility to smoking, after we controlled for demographics, exposure to smokers, and advertising receptivity. Mistrust of tobacco companies was associated with smoking behavior, with anti-industry support acting as a mediating variable. Among current smokers, support for anti-tobacco industry action was strongly associated with intentions to quit (OR=4.64; 95% CI=3.15, 6.84) after we controlled for demographics, exposure to smokers, and advertising receptivity.

CONCLUSIONS

Support for anti-tobacco industry action protects against smoking and is associated with intentions to quit among young adults. Encouraging involvement in tobacco control and against the tobacco industry may decrease smoking among young adults.

We examined factors associated with the frequency of HIV "prevention with positives" (PwP) counseling delivered by providers participating in demonstration projects at 26 clinics. Three hundred and fifteen primary care and support service providers completed a survey assessing the frequency of PwP delivered at initial medical care visits and at regular care visits. Providers reported delivering PwP counseling to more patients at initial visits (67%) than to those returning for regular care (53%; t = 11.8, p < 0.001). During initial and regular care visits, providers reporting a sense of responsibility for conducting PwP and those regularly discussing the risk of reinfection with patients reported significantly more frequent PwP counseling. Providers expressing a belief that no matter how much counseling was delivered, some HIV-infected patients would still infect others (prevention fatalism) reported significantly less frequent counseling at all visits. To improve the quality and quantity of HIV PwP counseling, providers training should address attitudinal barriers and facilitators to counseling and the importance of addressing risk routinely.

Thermal burns induce pain at the site of injury, mechanical hyperalgesia, associated with a complex time-dependent inflammatory response. To determine the contribution of inflammatory mediators to burn injury-induced mechanical hyperalgesia, we measured dynamic changes in the levels of three potent hyperalgesic cytokines, interleukin IL-1 beta, IL-6, and tumor necrosis factor-alpha (TNFalpha), in skin of the rat, following a partial-thickness burn injury. Only IL-6 demonstrated a sustained increase ipsilateral but not contralateral to the burn, correlating with the prolonged ipsilateral mechanical hyperalgesia. Spinal intrathecal injection of oligodeoxynucleotides antisense for gp130, a receptor subunit shared by members of the IL-6 family of cytokines, attenuated both burn- and intradermal IL-6-induced hyperalgesia, as did intradermal injection of anti-IL-6 function blocking antibodies. These studies suggest that IL-6 is an important mediator of burn-injury pain.

Neuropsychiatric behaviors are common in people with Alzheimer's disease (AD) and make both professional and lay caregiving difficult. Light therapy has been somewhat successful in ameliorating disruptive behaviors. This randomized trial tested the effects of morning or afternoon bright light exposure compared with usual indoor light on the presence, frequency, severity, and occupational disruptiveness of neuropsychiatric behaviors in nursing home residents with AD. Light was administered for 1 hr daily (Monday-Friday) for 10 weeks. The Neuropsychiatric Inventory-Nursing Home was used to assess behavior at baseline and end of the intervention. Analyses revealed statistically significant differences between groups on agitation/aggression, depression/dysphoria, aberrant motor behavior, and appetite/eating disorders. The magnitude of change was small and may not represent clinically significant findings. Agitation/aggression and nighttime behaviors commonly occurred and were highly correlated with occupational disruptiveness. Interventions that decrease the presence and/or severity of neuropsychiatric behaviors have the potential to significantly decrease caregiver burden.

Clinical trials are often stopped prematurely by Data and Safety Monitoring Boards, sponsors, or the investigators for reasons such as unexpected harmful effects of the intervention, clear lack of benefit, or futility due to sluggish recruitment or an unexpectedly low outcome rate in the placebo group. Planning for closeout, however, usually does not begin until after the trial is well underway. This article describes the experience of the Heart and Estrogen/progestin Replacement Study (HERS) investigators when data from the first year of follow-up revealed a clear but non-significant divergence in outcome rates between the treatment groups, and planning for early closure was initiated. Three advantages of beginning early to plan for closeout are described and approaches to planning closeout are suggested.