Renal-dose dopamine: from hypothesis to paradigm to dogma to myth and, finally, superstition?

Acute renal failure (ARF) is common in the critically ill and is associated with a high mortality rate. Its pathogenesis is not understood. Because animal models use ischemia to induce experimental ARF, there is the widespread belief that lack of blood flow is responsible for ARF. Low-dose dopamine (LDD) has been shown to increase renal blood flow in animal and in human volunteers. Thus, it has been administered to humans for almost 3 decades in the belief that it would lead to renal arterial vasodilation and increase renal blood flow (RBF). However, the etiology of ARF in critical illness is likely multifactorial, and the contribution of hypovolemia and reduced renal perfusion is unknown. Furthermore, interindividual variation in the pharmacokinetics of dopamine typically results in poor correlation between blood levels and administered dose, making accurate and reliable delivery of LDD difficult. Finally, dopamine is a proximal tubular diuretic that increases Na(+) delivery to tubular cells, thus increasing their oxygen demands. Accordingly, even if LDD were able to preferentially increase RBF, there is no guarantee that it would restore renal parenchymal oxygen homeostasis. More important, 2 meta-analyses and a large double-blind, prospective, multiple-center, randomized controlled trial have failed to demonstrate that dopamine protects the kidney in critically ill patients with ARF. Currently, there is insufficient evidence to support the use of renal-dose dopamine in the intensive care unit.     

Treatment strategies for multiple sclerosis: When to start,when to change,when to stop?

Multiple sclerosis(MS) is a chronic inflammatory condition of the central nervous system determined by a presumed autoimmune process mainly directed against myelin components but also involving axons and neurons. Acute demyelination shows as clinical relapses that may fully or partially resolve, while chronic demyelination and neuroaxonal injury lead to persistent and irreversible neurological symptoms, often progressing over time. Currently approved disease-modifying therapies are immunomodulatory or immunosuppressive drugs that significantly although variably reduce the frequency of attacks of the relapsing forms of the disease. However, they have limited efficacy in preventing the transition to the progressive phase of MS and are of no benefit after it has started. It is therefore likely that the potential advantage of a given treatment is condensed in a relatively limited window of opportunity for each patient, depending on individual characteristics and disease stage, most frequently but not necessarily in the early phase of the disease. In addition, a sizable proportion of patients with MS may have a very mild clinical course not requiring a disease-modifying therapy. Finally, individual response to existing therapies for MS varies significantly across subjects and the risk of serious adverse events remains an issue, particularly for the newest agents. The present review is aimed at critically describing current treatment strategies for MS with a particular focus on the decision of starting, switching and stopping commercially available immunomodulatory and immunosuppressive therapies.     

Abnormal Cervical Appearance: What to Do,When to Worry?

Many clinicians encounter cervical lesions that may or may not be associated with cytologic abnormalities. Such abnormalities as ectropion, Nabothian cysts, and small cervical polyps are quite benign and need not generate concern for patient or clinician, whereas others, including those associated with a history of exposure to diethylstilbestrol, cervical inflammation, abnormal cervical cytology, and postcoital bleeding, should prompt additional evaluation. Further, in some patients, the cervix may be difficult to visualize. Several useful clinical suggestions for the optimal examination of the cervix are presented.     

Potāto, potăto, proxy consent, permission -- just don't call the a whole thing off

Research involving critically ill persons highlights challenging questions surrounding third party authorization. The ethical and legal viability in research involving persons who do not have the capacity to consent to participation is not universally accepted, and inconsistent standards are reflected in research ethics guidelines, law and practice. In order to ensure that research participants who are considered incapable of consenting to research are appropriately protected, and that minimal risk research on illnesses affecting those who are unable to consent is enabled, clear and justifiable parameters must be created and, where they are already established, they must be made more transparent.     

Natural,complementary, alternative: which term to use?

Although natural therapies are slowly infiltrating Australian nursing practice, there is still no consensus over which term to use and what these terms actually denote and infer. This article will address these concerns to reduce the confusion and misperception that currently surrounds the terminology currently in use.     

Reflection,the way to professional development?

Background. Many studies have focused on reflection and the advantages that can be gained from the practice of reflection among Registered Nurses (RNs) but, what are the implications of the nurses’ reflections, what do they reflect about, and how do they deal with their reflections? Aims and objectives. The aim of this study was to describe the RNs’ experiences of reflection in relation to nursing care situations, and to understand how RNs use reflection in their daily work. What are the implications of the nursing care situations that the RNs’ reflect upon? What consequences did the practice of reflection have in nursing care situations in relation to the RNs professional development? Design and method. The study was carried out with interviews and the phenomenographic method. Interviews were carried out with four RNs. The choice of informants was made with purposive sampling with the aim of finding informants who could bring the kind of knowledge that was necessary for the study. Results. The qualitative differences regarding the RNs’ experiences of reflection were categorized as follows: to reflect (to think back – consider, mirroring, to reflect before and reflect after, to use experiences), nursing care situations (ethical considerations, to have courage, to use one's imagination, empathy) and consequences (to meet the unique, empathy, development). Finally, the findings were implicated in the model of professional development. Conclusion. By using reflection as a tool, many advantages can be gained in the development of nursing care. Encouraging RNs to reflect upon nursing situations, in order to promote the nurse's professional development, will imply better nursing care for the patients. The model for professional development implies a simplified representation of the thoughts pertaining to professional nursing development. Relevance to clinical practice. The relevance for clinical practice will be to understand the contents of the RNs reflections, to recognize the advantages of reflective practice and how and when to use such measures. Furthermore, to show how the model for professional development can be used in order to create a framework for evaluating these observations and consequently, for expressing tacit knowledge.     

What's the attraction to Magnet hospitals? Unlimited opportunity,resources, and autonomy draw nurses to these empowering facilities

Here, review study results that find nurses employed at Magnet hospitals experience enhanced job satisfaction due to greater access to empowerment structures within their practice setting.     

When does a difference make a difference? Interpretation of number needed to treat,number needed to harm,and likelihood to be helped or harmed

Although great effort is made in clinical trials to demonstrate statistical superiority of one intervention vs. another, insufficient attention is paid regarding the clinical relevance or clinical significance of the observed outcomes. Effect sizes are not always reported. Available absolute effect size measures include Cohen's d, area under the curve, success rate difference, attributable risk and number needed to treat (NNT). Of all of these measures, NNT is arguably the most clinically intuitive and helps relate effect size difference back to real‐world concerns of clinical practice. This commentary reviews the formula for NNT, and proposes acceptable values for NNT and its analogue, number needed to harm (NNH), using examples from the medical literature. The concept of likelihood to be helped or harmed (LHH), calculated as the ratio of NNH to NNT, is used to illustrate trade‐offs between benefits and harms. Additional considerations in interpreting NNT are discussed, including the importance of defining acceptable response, adverse outcomes of interest, the effect of time, and the importance of individual baseline characteristics.     

Perihepatic,Pulmonary, and Renal Abscesses Due to Spilled Gallstones

Background

Spilled gallstones are common during laparoscopic cholecystectomy; however, they rarely lead to postoperative complications. Perihepatic abscesses develop in < 0.1% of patients with spilled gallstones and are typically contained within the peritoneal cavity.