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The use of biofilters to remove nitrogen and other pollutants from urban stormwater runoff has demonstrated varied success across laboratory and field studies. Design variables including plant species and use of a saturated zone have large impacts upon performance. A laboratory column study of 22 plant species and designs with varied outlet configuration was conducted across a 1.5-year period to further investigate the mechanisms and influences driving biofilter nitrogen processing. This paper presents outflow concentrations of total nitrogen from two sampling events across both 'wet' and 'dry' frequency dosing, and from sampling across two points in the outflow hydrograph. All plant species were effective under conditions of frequent dosing, but extended drying increased variation between species and highlighted the importance of a saturated zone in maintaining biofilter function. The saturated zone also effectively treated the volume of stormwater stored between inflow events, but this extended detention provided no additional benefit alongside the rapid processing of the highest performing species. Hence, the saturated zone reduced performance differences between plant species, and potentially acts as an 'insurance policy' against poor sub-optimal plant selection. The study shows the importance of biodiversity and inclusion of a saturated zone in protecting against climate variability.

Background The cornerstone of effective management in heart failure (HF) is the ability to self-care. Aims include i) To determine factors influencing self-care in HF patients with cognitive impairment (CI) and ii) to determine the influence of cognitive domains on self-care in patients with HF and CI. Methods MEDLINE, CINAHL, EMBASE, EBSCOHost, PsychINFO, ProQuest Research Library, Health Technology Assessment Database, The Cochrane Library, Web of Science and Scopus databases were systematically searched. Original research describing the relationship between cognition and HF self-care in community-dwelling older persons with dementia/CI in English, published in a peer-reviewed journal from 1 st January(2000)-22 nd March(2016) was identified. Study and population characteristics, data sources, self-care processes, methods of cognitive assessment, cognitive domains affected, study outcomes, impact of impairment, and other risk factors of self-care impairment were abstracted by two reviewers. Results Of 10,688 studies identified, 14 met the inclusion criteria. Patients with HF and CI ranged from 14 to 73%. Where reported, self-care maintenance adequacy ranged from 50 to 61%; self-care management adequacy ranged from 14 to 36% and self-care confidence adequacy ranged from 0 to 44% on the Self-care of Heart Failure Index (SCHFI). All but one study predicted poor self-care ability according to poor outcome on cognitive testing. Additionally, specific cognitive domain deficits impaired self-care. Subjects with lower cognitive scores were less likely to seek assistance while subjects with depression had poor self-care abilities. Conclusions Clinicians must consider the type and severity of impairments in cognitive domains to tailor management. Awareness of depression, self-confidence and support access may modulate self-care ability. Electronic supplementary material The online version of this article (10.1186/s12872-019-1077-4) contains supplementary material, which is available to authorized users.

Objectives: To conduct a descriptive epidemiological analysis of external cause deaths (premature, usually injury‐related, and potentially preventable) of nursing home residents in Australia. Design: Retrospective study of a cohort of nursing home residents, using coronial data routinely recorded by the National Coronial Information System. Setting and participants: Residents of accredited Australian nursing homes, whose deaths were reported to coroners between 1 July 2000 and 30 June 2013, and determined to have resulted from external causes. Main outcome measures: Causes of death, analysed by sex and age group, and by location of incidents leading to death and location of death. Rates of death were estimated on the basis of Australian Bureau of Statistics population and Australian Institute of Health and Welfare nursing home data. Results: Of 21 672 deaths of nursing home residents, 3 289 (15.2%) resulted from external causes. The most frequent mechanisms of death were falls (2 679 cases, 81.5%), choking (261 cases, 7.9%) and suicide (146 cases, 4.4%). The incidents leading to death usually occurred in the nursing home (95.8%), but the deaths more frequently occurred outside the nursing home (67.1%). The annual number of external cause deaths in nursing homes increased during the study period (from 1.2 per 1000 admissions in 2001–02 to 5.3 per 1000 admissions in 2011–12). Conclusion: The incidence of premature and potentially preventable deaths of nursing home residents has increased over the past decade. A national policy framework is needed to reduce the incidence of premature deaths among Australians living in nursing homes.