Impact of a Smartphone App Reminder on Adherence to Aspirin Prescribed as Antithrombotic Therapy.

BACKGROUND: Many patients are discharged with aspirin (ASA) as an anticoagulant after joint replacement surgery. In studies in which ASA was prescribed, doses were frequently missed. Adherence to postoperative ASA regimen is critical to preventing thrombotic complications. This randomized controlled study evaluated the impact of an existing medication adherence smartphone application (app) on adherence to twice daily ASA 81 mg for 35 days after knee or hip arthroplasty. METHODOLOGY: Patients were randomized to either the app (intervention) group or the usual care (control) group. All patients received a baseline interview with a survey and demographics collected prior to randomization, a 36-day follow-up call for phone pill count, and a 6-week in-office interview with surveys and an in-person pill count. A convenience sample of 195 patients enrolled; 122 completed pill counts at both baseline and end of study. Ages ranged from 29 to 89 (mean: 60.4, SD: 10.1) years. The majority had a bachelor's degree or higher (59.3%), made more than $75,000 (or were retired; 51.9%), were of White race (75.9%), and female (53.8%). There were no significant demographic differences between the groups. RESULTS: There were no significant group differences in final pill counts, adherence (reasons for missed pills), or ASA Medication self-efficacy scores. However, the intervention group scored significantly higher on the ASA Adherence measure (general ease in and ability to take ASA; p = .020). Higher ASA Adherence scores were associated with lower pill counts at the end of study (better adherence) in the intervention group. There was a high rate of attrition related to failure to bring the ASA to hospital or to the follow-up appointment. CONCLUSIONS: Although there were no significant differences in final pill counts between groups, the app group reported more ease in taking pills. With smartphone use virtually ubiquitous, this project provided an opportunity to educate patients and nurses about how technology can support medication adherence. It was also an excellent opportunity to involve clinical nurses in a funded research project.

Detergent-based decellularization strategy preserves macro- and microstructure of heart valves.

OBJECTIVES: Biological tissue has great potential to function as bioprostheses in patients for heart valve replacement. As these matrices are mainly xenogenic, the immunogenicity needs to be reduced by decellularization steps. Reseeding of bioscaffolds has tremendous potential to prevent calcification upon implantation, so intact microstructure of the material is mandatory. An optimal decellularization protocol of heart valves resulting in adequate preservation of the extracellular architecture has still not been developed. Biological scaffolds must be decellularized to remove the antigenic potential while preserving the complex mixture of structural and functional proteins that constitute the extracellular matrix. METHODS: Here, we compared 3 different decellularization strategies for their efficiency to remove cells completely while preserving the porcine heart valve ultrastructure. Porcine pulmonary heart valves were treated either with trypsin-ethylenediaminetetraacetic acid (TRP), a protocol using detergents in combination with nucleases (DET + ENZ), or with Accutase® solution followed by nuclease treatment (ACC + ENZ). The treated heart valves then were subjected to histological, DNA and scanning electron microscopic analyses. RESULTS: All DNA fragments were removed after ACC + ENZ treatment, whereas cellular removal was incomplete in the TRP group. TRP and ACC + ENZ-treated valves were enlarged and showed a disrupted architecture and degraded ultrastructure. In contrast, fully acellular heart valves with intact architecture, layer composition and surface topography were achieved with DET + ENZ treatment. DET + ENZ treatment yielded excellent results in terms of preservation of material architecture and removal of DNA content. CONCLUSIONS: Compared to TRP and ACC + ENZ procedures, DET + ENZ-treated porcine pulmonary heart valves demonstrated well-preserved macroscopic structures and microscopic matrix components and represent an excellent scaffold for further application in tissue engineering.