Using grounded theory methodology, six intensive care patients were interviewed regarding their perceptions of their own needs, concerns and wants and how nurses responded to those. Each patient was interviewed three times to detect any change in responses during the hospitalization. A theme of patient-nurse negotiation emerged. Patients came into the health care setting with a "generative source," the issues and beliefs they had regarding health-care and nurses in general. This affected patients' definition of themselves, their situation, the caregiver, their relationship with the caregiver, and their own needs and expectations. When a patient's definitions of self or situation varied form the nurse's, negotiation would occur. Two main categories of negotiation were used by both patient and nurse: Personal knowledge & Strategies. If negotiation failed to bring consensus, resulting actions were negative feelings and dissatisfaction, and a sense of vulnerability for the patient. This in turn impacted negatively on the patient's generative source and definitions. As the patient progressed through the hospital system toward discharge, the greatest changes were noted in how they defined themselves and the caregiver, and in the style of negotiation they used.

När det är dags för ett barn att överflyttas från en barnintensivvårdsavdelning (BIVA) till en vanlig vårdavdelning lämnas en känd miljö med känd personal och noggrann monitorering för att påbörja en ny fas på ett okänt ställe. Denna nya fas kan för föräldrarna representera förbättring av barnets hälsa och ett steg närmare hem, men är också initialt en period av oro, stress och rädsla. Studiens syfte var att beskriva föräldrars upplevelser av överflyttning av sitt barn från BIVA till vårdavdelning. En kvalitativ metod användes med intervjuer som datainsamlingsmetod där fem föräldrar intervjuades. Kvalitativ innehållsanalys valdes som analysmetod. Resultatet visar att information om vårdavdelningen, möjligheter för smärtlindring till barnet och innehåll i det som överrapporteras var viktigast för att känna kontroll och trygghet. Det sågs stora skillnader mellan BIVA och avdelningen men överflyttningen upplevdes även som ett positivt steg för förbättring och hemgång. Föräldrarna hade överlag en positiv upplevelse av överflyttningen. Kontroll och trygghet är viktigt vårdtiden igenom och så också under överflyttningen. Den minskade vårdnivån innebar att föräldrar fick ta ett större egenansvar.

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published_or_final_version / Nursing Studies / Master / Master of Nursing

Hyperglycaemia in critical care is common and has been linked to increased mortality and morbidity. Tight control of blood glucose concentrations to more normal levels can significantly reduce the negative outcomes associated with hyperglycaemia. However, hypoglycaemia and glycaemic variability have also been independently shown to increase mortality in critically ill patients. Further complicating the matter, critically ill patients exhibit high inter- and intra patient metabolic variability and thus consistent, safe control of glycaemia has proved very difficult. Model-based and model-derived tight glycaemic control methods have shown significant ability to provide very tight control with little or no hypoglycaemia in the intensive care unit (ICU). The model-based control practised in the Christchurch Hospital ICU uses a physiological model that relies on a single, time-varying parameter, SI, to capture the patient-specific glycaemic response to insulin. As an identified parameter, SI is prone to also capturing other, unintended, dynamics that add variability on multiple timescales. The objective of this research was to enable enhanced glycaemic control by addressing this variability of the SI parameter through better modelling and implementation. An improved model of insulin secretion as a function of blood glucose concentration was developed using data collected from a recent study at the Christchurch Hospital ICU. Separate models were identified for non-diabetic patients and diagnosed, or suspected type II diabetic patients, with R2 = 0.61 and 0.69, respectively. The gradients of the functions identified were comparable to data published in a number of other studies on healthy and diabetic subjects. The transcapilliary diffusion (nI) and cellular clearance (nC) rate parameters were optimised using data from published microdialysis studies. Interactions between these key parameters determine maximum interstitial insulin concentrations available for glucose disposal, and thus directly influence SI. The optimal values of these parameters were determined to be nI = nC = 0.0060 1/min. Models of endogenous glucose production (EGP), as functions of blood glucose concentration and time, were assessed. These models proved unsatisfactory due to difficulties in identifying reliable functions with the available data set. Thus, it was determined that EGP should continue to be treated as a population constant, except during real-time glycaemic control, where the value may be adjusted temporarily to ensure valid SI values. The first 24 hours of ICU stay proved to be a period of significantly increased SI variability, both in terms of hour-to-hour changes and longer-term evolution of level. This behaviour was evident for the entire study cohort as a whole and was particularly pronounced during the first 12-18 hours. The subgroup of cardiovascular surgery patients, in which there was sufficient data for analysis, mirrored the results of the whole cohort, but was found to have even lower and more variable SI. Glucocorticoid steroids were also found to be associated with clinically significant reductions in overall level and increases in hour-to-hour variability of SI. To manage variability caused by factors external to the physiological model, the use of several stochastic models was proposed. Using different models for the early part of ICU stay and for different diagnostic subgroups as well as when patients were receiving certain drug therapies would permit control algorithms to reduce the impact of the SI variability on outcome glycaemia. The impact of measurement timing and BG concentration errors on the variability of SI was assessed. Results indicated that the impact of both sources of errors on SI level was unlikely to be clinically significant. The impact of BG sensor errors on hour-to-hour SI variability was more pronounced. Understanding the effect of sensor and timing errors on SI allows their impact to be reduced by using the 5-95 percentile forecast range of stochastic models during glycaemic control. The performance of the model incorporating the proposed insulin kinetic parameters and secretion enhancements was validated for clinical glycaemic control and virtual trial purposes. This validation was conducted by self- and cross validation on a cohort independent to that with which the model was developed. The use of multiple stochastic models to reduce the impact of this extrinsic variability during glycaemic control was validated using virtual trials.

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This thesis describes a qualitative enquiry into the experiences of families visiting an adult intensive care unit (ICU) during a critical illness of a family member and nurses’ perceptions of families in this environment. A Grounded Theory approach was taken. Nine families (12 adults, 12 young people) with a family member in intensive care and twenty intensive care nurses in five focus groups contributed their experiences to the study through group interviews. Families described the admission of a family member as a traumatic event. The core experiences of families which emerged in the study revolved around uncertainty. Drawing on Davis’ (1963/1991, 1966) concepts of ‘clinical uncertainty’ and ‘functional uncertainty’ a number of strategies families and young people developed in dealing with the situation were identified. ‘Clinical uncertainty’ captures the unknown and unknowable aspects of critical illness. The ‘Functional uncertainty’ category emerged later in the research process and brings to light management of information disclosure for functional gain as a communication strategy. Functional uncertainty was identified in communications between nurses and families and between parents and children within families. Moreover, young people used the same ‘functional uncertainty’ strategy when disclosing information to peers within the school environment. ‘Keeping normality in life’ and ‘fishing for information’ and the associated strategies were identified as direct responses of young people to clinical and functional uncertainty. The strategies identified provide new insights into how young people process a critical illness event in their families. This emphasises the importance of listening to young people’s voices and the need to include young people in future studies. ‘Nursing in public’ emerged as an overarching theme within the data from nurses’ interviews. The contrasting interests of nurses and families in the context of critical illness became evident when open visiting policies were discussed. The promotion by policy makers and nursing scholars of a patient centred health care service and thus the implicit integration of families into care challenges nurses to adapt their working practices. Whilst this study provides evidence for the importance of integrating families into care it also shows the needs of nurses are in danger of being marginalised. Respecting the needs of families and nurses the question becomes how best to balance the competing needs of both groups. It is suggested that a ‘partnership in care’ approach which is firmly based on negotiations between nurses and families under the leadership of nurses will allow for the emergence of family care in intensive care, to the benefit of patients, families and nurses.

Driven by research studies and national targets, sedation practices in Intensive care Units (ICU) are undergoing change. Traditionally, ventilated patients in ICUs were kept deeply sedated and only gradually ‘weaned off’ sedation. However, current evidence supports a more ‘wakeful’ patient with the introduction of ‘sedation holds’ encouraging them to regain consciousness (Kress et al. 2000). There is little research exploring ICU nurses’ assessment and management of sedation. Employing a Heideggerian, hermeneutic phenomenological approach to enquiry, the study sought to provide insights into the world of the critical care nurse, nursing with technology, and specifically their beliefs surrounding sedation practices and how organisational factors, knowledge and personal experiences influence their clinical decisions in the care of the ventilated patient. The setting was the Royal Infirmary of Edinburgh, ICU and the purposive sample consisted of 16 ICU nurses with diverse critical care nursing experience. Bedside interviews, utilising an aide memoir, elicited narratives about the nurses’ experiences of sedation practice and a novel sedation monitor (responsiveness). The phenomenological analysis drew upon a number of existing frameworks to guide enquiry. The researcher engaged with the ‘hermeneutic circle’, acknowledging her pre-understandings and using these as a platform to move between the whole of the research and the parts, the descriptions and narratives offered, to develop new knowledge. Themes emerged that demonstrated patients’ sedation status directly impacted upon the nurses’ ICU lived experiences and left them in a state of disequilibrium regarding the requirement to deliver research based care, the desire to deliver holistic care and the duty to deliver safe care. The nurses perceived sedation holds and ‘wakefulness’ as resulting in patient agitation and distress which affected patient safety and comfort. However, the nurses equally felt a pressure of obligation to the doctors to perform such evidence based sedation holds. They described the struggling to maintain patient safety and manage their own fears and anxieties and organisational constraints, whilst experiencing guilt, blame and failure associated with their behavioural discordance with the prescribed decisions and their own clinical decision making processes and strategies. Team work between the two professions and effective leadership is evidently less than ideal. Consequently the implementation of changes in sedation practice is failing to meet either the national targets or to respond to the nurses’ concerns regarding their patient’s short term wellbeing. On both counts this potentially impairs the pursuit of best practice.