Bipartite Unique Neighbour Expanders via Ramanujan Graphs.

We construct an infinite family of bounded-degree bipartite unique neighbour expander graphs with arbitrarily unbalanced sides. Although weaker than the lossless expanders constructed by Capalbo et al., our construction is simpler and may be closer to being implementable in practice, due to the smaller constants. We construct these graphs by composing bipartite Ramanujan graphs with a fixed-size gadget in a way that generalises the construction of unique neighbour expanders by Alon and Capalbo. For the analysis of our construction, we prove a strong upper bound on average degrees in small induced subgraphs of bipartite Ramanujan graphs. Our bound generalises Kahale's average degree bound to bipartite Ramanujan graphs, and may be of independent interest. Surprisingly, our bound strongly relies on the exact Ramanujan-ness of the graph and is not known to hold for nearly-Ramanujan graphs.

Perceptions of Israeli women with breast cancer regarding the role of the Breast Care Nurse throughout all stages of treatment: a multi center study.

PURPOSE OF THE RESEARCH: The role of the Breast Care Nurse (BCN) is well established in Israel. The purpose of this study is to examine the impact of the BCN on Israeli women with breast cancer at all stages of disease from diagnosis, through treatment and follow-up. METHODS: This was a descriptive multi-center study on 321 women with non-metastatic breast cancer who completed their treatment <5 years before. Data collection took place in seven institutions in Israel, both in hospital and in the community. The women completed two questionnaires: a demographic questionnaire and the Ipswitch Patient Questionnaire looking at various aspects of care. Also included was one qualitative open question. Data analysis was performed checking for outliers and illogical observations. KEY RESULTS: In most areas investigated the women perceived the overall contribution of the BCN as very high, with 87% reporting a general contribution of very high or high. It was found that 53% of the women received information about the position from the nurse herself. In 61.3% of the cases, initial contact with the BCN was made at the time of diagnosis. The qualitative findings concerning the open question are also reported. CONCLUSIONS: According to the perceptions of women with breast cancer in Israel, BCN support is an important part of the patient's ability to manage their diagnosis and related care. The multi-disciplinary breast cancer team should incorporate BCN specialists as part of their holistic care.

Posttraumatic stress, nonadherence, and adverse outcome in survivors of a myocardial infarction.

OBJECTIVE: Posttraumatic stress disorder (PTSD) symptoms have been reported in patients with coronary vascular disease, after the trauma of a myocardial infarction (MI). The effect of these symptoms on post-MI disease control has not been elucidated. We conducted a study that sought to determine whether PTSD symptoms post-MI are associated with increased likelihood of cardiovascular readmission and with nonadherence to treatment recommendations. METHODS: Patients were recruited during a visit in a cardiology clinic 6 months post-MI and were followed for 1 year. Adherence to aspirin was measured by platelet thromboxane production (an indication of aspirin's effect). Medical outcome was measured as rate of admission due to cardiovascular causes during the follow-up period. Self-report measures of PTSD (Impact of Event Scale), Depression, and Global Distress (SCL-90-R) were administered at enrollment. RESULTS: Seventy-three patients were studied. Above-threshold PTSD symptom scores at enrollment, but not depression or global distress scores, were significant predictors of nonadherence to aspirin and of an increased likelihood of cardiovascular readmission over the course of the following year. CONCLUSIONS: PTSD symptoms predicted poor disease control in this cohort of MI survivors. The data suggest that screening MI survivors for symptoms of PTSD may be beneficial if this high-risk population is to be targeted for interventions.

Lack of aspirin effect: aspirin resistance or resistance to taking aspirin?

BACKGROUND: A lack of aspirin effect on platelets after a myocardial infarction (MI) is associated with poor health outcome. This lack of effect may be due to biological resistance to aspirin or due to nonadherence (the patient is not taking the aspirin, hence it has no effect). Determining which of these factors predicts poor outcome would inform potential intervention strategies. METHODS: Aspirin effect on platelets was assessed in a cohort of MI survivors who were divided into three groups: group A ("adherent"), patients whose platelets were affected by aspirin; group B ("nonadherent"), patients whose platelets showed no aspirin effect and who admitted in an interview that they were not taking their medications; and group C (potentially biologically resistant to aspirin), patients whose platelets showed no aspirin effect but maintained that they were taking their aspirin. Two health outcome measures (death, reinfarction, or rehospitalization for unstable angina; or admission for any cardiovascular causes) were assessed 12 months after enrollment. RESULTS: Seventy-three patients were enrolled and classified into groups A ("adherent," 52 patients), B ("nonadherent," 12 patients), and C ("potentially aspirin resistant," 9 patients). Adverse events and readmission were more common in the nonadherent group (B)-42% and 67%, respectively, when compared with the adherent group (A)-6% and 11%, and with the potentially biologically resistant group (C)-11% and 11%. CONCLUSIONS: Nonadherence is a significant mediator of poor outcome. It is important to evaluate whether or not patients are taking their medications in clinical settings and in studies that evaluate the effect of prescribed medications.