Linking Macroinvertebrates and Physicochemical Parameters for Water Quality Assessment in the Lower Basin of the Volta River in Ghana.

The health of the lower basin of the Volta River in Ghana was evaluated in January-February and May-June 2016 using physicochemical parameters and benthic macroinvertebrates sampled at 10 locations. Selected environmental variables were compared to accepted environmental water quality standard values where applicable. Principal component analysis (PCA) and redundancy analysis (RDA) were used to analyse the association between the benthic macroinvertebrates distribution and physicochemical variables. Pesticide concentrations were generally below the limit of detection 0.01 and 0.005 µg/L for organophosphate/synthetic pyrethroid and organochlorines respectively. Nutrient levels were also generally low; however, significant differences existed between the values of physicochemical parameters at the different sampling sites and seasons (Monte Carlo permutation test; p = 0.002), as well as between the abundance of macroinvertebrates at the different sites and seasons (p = 0.002). The environmental variables dissolved oxygen (DO), phosphate, pH, substratum (p < 0.05), turbidity, conductivity, total dissolved solids, total solids and nitrate (0.05 < p < 0.10) significantly explained the variation in macroinvertebrate composition between sampling stations in the Volta River. Polypedilum fuscipenne, was positively correlated with turbidity and DO concentrations; Physa sp., Centroptilum sp., Centroptiloides sp., Phaon iridipennis and juvenile fish were positively correlated with nitrate concentration and pH and negatively correlated with turbidity and DO. Polluted sites were dominated by the snail Lymnaea glabra. This demonstrates that physicochemical parameters and macroinvertebrates could be applied to describe the water quality and improve the biomonitoring for water resources management and the environmental protection in the Lower Volta River.

Environmental risk assessment of pesticides currently applied in Ghana.

Registration of pesticides for use in Ghana is based on prospective environmental risk assessment (ERA) to assess the risks of future pesticide use on the environment. The present study evaluated whether pesticides currently used by Ghanaian farmers may harm the aquatic and terrestrial environment under day-to-day farm practice by performing a 1st tier ERA for terrestrial and aquatic environment and a 2nd tier ERA for the aquatic environment using existing scenarios and models. Results of the 1st tier risk assessment indicated that in the investigated regions in south Ghana, many pesticides might pose an acute risk to aquatic ecosystems adjacent to the treated fields while lambda cyhalothrin, chlorpyrifos, cypermethrin, dimethoate, mancozeb, carbendazim, sulphur, maneb and copper hydroxide may pose the highest chronic risks. Butachlor, dimethoate and carbendazim may pose acute risks to the terrestrial soil ecosystem, while glyphosate, chlorpyrifos, imidacloprid, dimethoate, mancozeb, carbendazim, maneb, copper hydroxide and cuprous oxide may pose the highest chronic risks. Many insecticides and some fungicides may pose acute risks to bees and terrestrial non-target arthropods. The 2nd tier acute aquatic risk assessment showed that most risks were substantiated using species sensitivity distribution (SSD). Actual pesticide use was a factor of 1.3-13 times higher than the recommended label instructions, indicating a general practice of overdosing. The case study shows that the PRIMET model in combination with the SSD concept may offer pesticide registration authorities in Ghana a means to assess environmental risks associated with pesticide usage in a user-friendly and cost-effective manner.

Pesticides Decrease Bacterial Diversity and Abundance of Irrigated Rice Fields.

Bacteria play an important role in soil ecosystems and their activities are crucial in nutrient composition and recycling. Pesticides are extensively used in agriculture to control pests and improve yield. However, increased use of pesticides on agricultural lands results in soil contamination, which could have adverse effect on its bacterial communities. Here, we investigated the effect of pesticides commonly used on irrigated rice fields on bacterial abundance and diversity. Irrigated soil samples collected from unexposed, pesticide-exposed, and residual exposure areas were cultured under aerobic and anaerobic conditions. DNA was extracted and analysed by 16S rRNA sequencing. The results showed overall decrease in bacterial abundance and diversity in areas exposed to pesticides. Operational taxonomic units of the genera Enterobacter, Aeromonas, Comamonas, Stenotrophomonas, Bordetella, and Staphylococcus decreased in areas exposed to pesticides. Conversely, Domibacillus, Acinetobacter, Pseudomonas, and Bacillus increased in abundance in pesticide-exposed areas. Simpson and Shannon diversity indices and canonical correspondence analysis demonstrated a decrease in bacterial diversity and composition in areas exposed to pesticides. These results suggest bacteria genera unaffected by pesticides that could be further evaluated to identify species for bioremediation. Moreover, there is a need for alternative ways of improving agricultural productivity and to educate farmers to adopt innovative integrated pest management strategies to reduce deleterious impacts of pesticides on soil ecosystems.

Why are patients not more involved in their own safety? A questionnaire-based survey in a multi-ethnic North London hospital population.

PURPOSE: Active patient participation in safety pathways has demonstrated benefits in reducing preventable errors, especially in relation to hand hygiene and surgical site marking. The authors sought to examine patient participation in a range of safety-related behaviours as well as factors that influence this, such as gender, education, age and language. DESIGN: A 20-point questionnaire was employed in a London teaching hospital to explore safety-related behaviours, particularly assessing patient's willingness to challenge healthcare professionals and engagement in taking an active role in their own care while in hospital. Data was also collected on participant demographic details including gender, age, ethnicity, English language proficiency and education status. RESULTS: 85% of the 175 patients surveyed would consider bringing a list of their medications to hospital, but only 60% would bring a list of previous surgeries. Only 45% would actively engage in the WHO Safer Surgery Checklist and over three quarters (80%) would not challenge doctors and nurses regarding hand hygiene, believing that they would cause offence. Female patients who had tertiary education, were fluent in English and less than 60 years of age were statistically more likely to feel responsible for their own safety and take an active role in safety-related behaviour while in hospital (p<0.05). CONCLUSIONS: Many patients are not engaged in safety-related behaviour and do not challenge healthcare professionals on safety issues. Older male patients who were not tertiary educated or fluent in English need to be empowered to take an active role in such behaviour. Further research is required to investigate how to achieve this.

Measure to quantify the influence of time from end of surgery to tracheal extubation on operating room workflow.

BACKGROUND: The impact of delays in extubation on operating room (OR) workflow are challenging to assess because such delays may or may not be a bottleneck to the patient leaving the OR. We developed an observational measure that quantifies the influence of extubation times on OR workflow. METHODS: The time from dressing on the patient (or its functional equivalent) to tracheal extubation was observed in ORs, among a cohort of adult patients undergoing elective (scheduled) general anesthesia. During the first 36 extubations, the measure was developed using qualitative methods. During the subsequent 64 extubations, qualitative observation was supplemented with quantitative measurement. Interrater reliability was assessed during the final 30 of the 64 extubations. Video 1 (see Supplemental Digital Content 1, http://links.lww.com/AA/A396) shows animation of a typical observation period. RESULTS: The developed measure was a single value for each case: whether at least 1 person was doing no visible physical activity potentially related to patient care for at least 1 minute between dressing on the patient and tracheal extubation. Assessing reliability, 2 raters' listings of cases with no versus 1 or more people idle were identical for 30 of 30 cases (95% lower confidence limit >90%). Spearman r = 0.99 (95% lower confidence limit 0.99) for time from dressing on patient to extubation. Predictive validity was shown by positive correlation between the percentage of cases with at least 1 person idle and extubation time (P < 0.0001): 21% for <5 minutes, 42% for 5 to 10 minutes, 87% for 10 to 15 minutes, and 100% for >15 minutes. DISCUSSION: Longer times to extubation are associated with an increased chance of at least 1 person waiting in the OR. This measure can be used in observational studies and for lean engineering projects to assess conditions when time to extubation affects workflow. Observers can combine use of this measure for extubation times with the previously developed measure for studying the influence of induction times on OR workflow.