[The Rule of Rescue - Irrational and Discriminating?] / Rule of Rescue vs. Rettung statistischer Leben.

State of the debate: The "Rule of Rescue" refers to the practice that, in order to save people from immediate peril, societies incur high costs largely irrespective of the fact that many more lives could be saved under alternative uses of the resources. The practice has been found difficult to explain, let alone justify, and has often been criticized. In the early literature in the context of the Oregon rationing experiment, the irrationality objection dominated in view of the obvious lack to consider opportunity costs. More recent contributions, taking account of the declining support for purely efficiency-oriented prioritization approaches, advance an equity objection: The practice discriminates against statistical lives. Intent of the present contribution: This article provides a critical assessment of both objections. Results: The following contentions result from the analysis: 1. The equity objection is unfounded; 2. Following the rule of rescue is (in a certain sense) inefficient, but it is not irrational; 3. The criticized judgments result from deep-seated shortcomings in the action-theoretical concepts used (or rather, omitted) in the literature. These shortcomings are inherent in the consequentialist framework dominating the debate and deserve more attention.

[QALYs and fairness: health economic approaches to the fairness issue and their problems]. / QALYs und Gerechtigkeit: Ansätze und Probleme einer gesundheitsökonomischen Lösung der Fairnessproblematik.

Empirical studies have shown that QALY-maximization leads to results that are perceived as unfair. Health economists have attempted to integrate fairness aspects in Cost-Utility Analysis by means of equity weighting. A well-known example is Cost-Value Analysis (Nord et al.). Over and above the value of individual health related utilities, it tries to capture the value of distributing resources fairly. The debate has shown, however, that these approaches face several problems. The present contribution argues that the difficulties are of a more fundamental nature than most contributors to the debate have hitherto assumed. Cost-utility analysis, we believe, cannot consistently be adjusted to meet fairness objections by means of weighting schemes.

Autonomous auscultation of the human heart employing a precordial electro-phonocardiogram and ensemble empirical mode decomposition.

The research presented in this paper serves to provide a tool to autonomously screen for cardiovascular disease in the rural areas of Africa. With this tool, cardiovascular disease can potentially be detected in its initial stages, which is essential for effective treatment. The autonomous auscultation system proposed here utilizes recorded heart sounds and electrocardiogram signals to automatically distinguish between normal and abnormal heart conditions. Patients that are identified as abnormal by the system can then be referred to a specialist consultant, which will save a lot of unnecessary referrals. In this study, heart sound and electrocardiogram signals were recorded with the prototype precordial electro-phonocardiogram device, as part of a clinical study to screen patients for cardiovascular disease. These volunteers consisted of 28 patients with a diagnosed cardiovascular disease and, for control purposes, 34 persons diagnosed with healthy hearts. The proposed system employs wavelets to first denoise the recorded signals, which is then followed by segmentation of heart sounds. Frequency spectrum information was extracted as diagnostic features from the heart sounds by means of ensemble empirical mode decomposition and auto regressive modelling. The respective features were then classified with an ensemble artificial neural network. The performance of the autonomous auscultation system used in concert with the precordial electro-phonocardiogram prototype showed a sensitivity of 82% and a specificity of 88%. These results demonstrate the potential benefit of the precordial electro-phonocardiogram device and the developed autonomous auscultation software as a screening tool in a rural healthcare environment where large numbers of patients are often cared for by a small number of inexperienced medical personnel.

[Should IQWiG revise its methods of cost-effectiveness analysis in order to comply with more widely accepted health economical evaluation standards?]. / Sollte sich das IQWiG auf indikationsübergreifende Kosten-Nutzen-Bewertungen mittels des QALY-Konzepts einlassen?

IQWiG, Germany's equivalent to Britain's National Institute for Health and Clinical Excellence (NICE), has adopted an unorthodox method of cost-effectiveness analysis. The method does not use QALYs (quality adjusted life years). Its main point is that it tries to avoid comparative judgement on the relative value of treatment effects in different medical areas. The present contribution assesses the controversy that has arisen over IQWiG's methods by discussing a) whether comparative judgements will at least implicitly be made anyway as soon as the IQWiG makes reimbursement recommendations in more than one medical area, and b) whether the well-known fairness objections against QALY maximization can plausibly be dealt with by equity weigthing or, generally, by moving on to "societal value" maximization, which tries to include fairness values in addition to cost-effectiveness. It is concluded that the answer is "No" for both points, which leads to a "No" for the title question as well.

Autonomous detection of heart sound abnormalities using an auscultation jacket.

This paper presents a study using an auscultation jacket with embedded electronic stethoscopes, and a software classification system capable of differentiating between normal and certain auscultatory abnormalities. The aim of the study is to demonstrate the potential of such a system for semi-automated diagnosis for underserved locations, for instance in rural areas or in developing countries where patients far outnumber the available medical personnel. Using an "auscultation jacket", synchronous data was recorded at multiple chest locations on 31 healthy volunteers and 21 patients with heart pathologies. Electrocardiograms (ECGs) were also recorded simultaneously with phonocardiographic data. Features related to heart pathologies were extracted from the signals and used as input to a feed-forward artificial neural network. The system is able to classify between normal and certain abnormal heart sounds with a sensitivity of 84% and a specificity of 86%. Though the number of training and testing samples presented are limited, the system performed well in differentiating between normal and abnormal heart sounds in the given database of available recordings. The results of this study demonstrate the potential of such a system to be used as a fast and cost-effective screening tool for heart pathologies.

Early intervention care programme for parents of neonates.

Parents with neonates in the neonatal intensive care unit (NICU) experience different needs at different stages of their neonates' stay in the NICU. The needs of parents with neonates in NICU's play an important role in aspects such as the ability to cope with changing parental roles and emotions, the relationship between parent and infant and the managing of the parents' own needs. The aim of this study was to develop an intervention care programme for parents with neonates in the NICU. This intervention care programme will empower parents to manage their own needs and the needs of their neonates while the neonate is admitted to the NICU and after discharge from the NICU / hospital. Literature is available on care programmes for neonates, but not on programmes for the parents of neonates in NICU. The study was a multi-phased study, using qualitative methodologies to determine the needs of South African parents with neonates in level III NICU's. In phase I, the needs of parents with neonates in NICU were elicited qualitatively. The needs were identified from the data and the results led to the implementation of phase II. In phase II the question was adjusted and new data was collected. Phase III was implemented to validate the data derived from phases I and II. The data was categorised in different need categories and these categories were used to plan an intervention care programme for parents with neonates in NICU's. The programme provides information to address needs as identified by parents in the research study and as derived from the literature. Need categories identified from the study and literature were as follows: information, communication, emotional, learning, discharge and individual needs. This programme is available in electronic format to enable parents to obtain information according to their changing needs and to provide unlimited access to updated information. The "Early intervention care programme for parents of neonates" will empower parents to manage their own needs and the needs of their neonates while the neonate is admitted to the NICU and after discharge from the NICU / hospital.

[Economic efficiency and fairness: two ethical criteria? A basic reflection]. / Wirtschaftlichkeit und Gerechtigkeit: zwei ethische Gebote? Eine Grundlagenreflexion.

Many statements on the allocation of health care resources show an appreciation of the two criteria "efficiency" and "fairness" as two values which are to be weighed against each other in case of conflict. This article provides a critique of this model, which is conceived to rest on a hybrid (partly utilitarian, partly counter-utilitarian) basis. The most important fairness-related argument, or so it is argued, is of a sort which is incompatible with the reasons utilitarianism (or, indeed, consequentialism) provides as a basis for the efficiency criterion. If the argument is right, we have to provide another basis, at least as far as moral inhibitions are strong about taking efficiency into account. The present article does not go into detail about such an alternative. It relates to the on-going discussion on John Taurek's (1977) article about "numbers", especially on the so-called aggregation argument against Taurek's "no-worse-claim", and argues against the majority of commentators, consequentialist and deontological alike, that Taurek was right.

Early intervention care programme for parents of neonates.

Parents with neonates in the neonatal intensive care unit (NICU) experience different needs at different stages of their neonates' stay in the NICU. The needs of parents with neonates in NICU's play an important role in aspects such as the ability to cope with changing parental roles and emotions, the relationship between parent and infant and the managing of the parents' own needs. The aim of this study was to develop an intervention care programme for parents with neonates in the NICU. This intervention care programme will empower parents to manage their own needs and the needs of their neonates while the neonate is admitted to the NICU and after discharge from the NICU/hospital. Literature is available on care programmes for neonates, but not on programmes for the parents of neonates in NICU. The study was a multi-phased study, using qualitative methodologies to determine the needs of South African parents with neonates in level III NICU's. In phase I, the needs of parents with neonates in NICU were elicited qualitatively. The needs were identified from the data and the results led to the implementation of phase II. In phase II the question was adjusted and new data was collected. Phase III was implemented to validate the data derived from phases I and II. The data was categorised in different need categories and these categories were used to plan an intervention care programme for parents with neonates in NICU's. The programme provides information to address needs as identified by parents in the research study and as derived from the literature. Need categories identified from the study and literature were as follows: information, communication, emotional, learning, discharge and individual needs. This programme is available in electronic format to enable parents to obtain information according to their changing needs and to provide unlimited access to updated information. The "Early intervention care programme for parents of neonates" will empower parents to manage their own needs and the needs of their neonates while the neonate is admitted to the NICU and after discharge from the NICU/hospital.

Cation hexaammines are selective and potent inhibitors of the CorA magnesium transport system.

Cation hexaammines and related compounds are chemically stable analogs of the hydrated form of cations, particularly Mg(2+). We tested the ability of several of these compounds to inhibit transport by the CorA or MgtB Mg(2+) transport systems or the PhoQ receptor kinase for Mg(2+) in Salmonella typhimurium. Cobalt(III)-, ruthenium(II)-, and ruthenium(III)-hexaammines were potent inhibitors of CorA-mediated influx. Cobalt(III)- and ruthenium(III)chloropentaammines were slightly less potent inhibitors of CorA. The compounds inhibited uptake by the bacterial S. typhimurium CorA and by the archaeal Methanococcus jannaschii CorA, which bear only 12% identity in the extracellular periplasmic domain. Cation hexaammines also inhibited growth of S. typhimurium strains dependent on CorA for Mg(2+) uptake but not of isogenic strains carrying a second Mg(2+) uptake system. In contrast, hexacyano-cobaltate(III) and ruthenate(II)- and nickel(II)hexaammine had little effect on uptake. The inhibition by the cation hexaammines was selective for CorA because none of the compounds had any effect on transport by the MgtB P-type ATPase Mg(2+) transporter or the PhoQ Mg(2+) receptor kinase. These results demonstrate that cation hexaammines are potent and highly selective inhibitors of the CorA Mg(2+) transport system and further indicate that the initial interaction of the CorA transporter is with a fully hydrated Mg(2+) cation.

Ascending aortic aneurysm and dissection in young adults with bicuspid aortic valve: implications for echocardiographic surveillance.

Bicuspid aortic valve (BAV) is an independent risk factor for aneurysm and dissection of the ascending aorta. Despite this association, routine imaging of the aorta has not been recommended for patients with BAV. We describe two young men who developed life-threatening aneurysm or dissection of the ascending aorta; one had a normally functioning BAV and the other was 10 years after valve replacement. The pathology of this condition is very similar to that found in the Marfan syndrome. We recommend echocardiographic surveillance of the ascending aorta at regular intervals, and consideration of beta-adrenergic blockade among patients with significant dilation.

Potential arrhythmogenic role of cyclic adenosine monophosphate (AMP) and cytosolic calcium overload: implications for prophylactic effects of beta-blockers in myocardial infarction and proarrhythmic effects of phosphodiesterase inhibitors.

Activation of the adrenergic nervous system appears to play a crucial role in the genesis of fatal arrhythmias associated with the very early stages of acute myocardial infarction. The second messenger of beta-adrenergic catecholamine stimulation, cyclic adenosine monophosphate (AMP), has established arrhythmogenic qualities, acting by an increase in cytosolic calcium, which potentially has three adverse electrophysiologic effects. First, stimulation of the transient inward current by excess oscillations of cytosolic calcium can invoke delayed afterdepolarizations, so that triggered automaticity can develop in otherwise quiescent ventricular muscle. Second, cyclic AMP can evoke calcium-dependent slow responses in depolarized fibers, so that conditions for reentry are favored. Third, excess cytosolic calcium can cause intercellular uncoupling with conduction slowing. Focal changes in cyclic AMP and cytosolic calcium promote the development of ventricular fibrillation. Beta-adrenergic blockade can limit the formation of cyclic AMP in ischemic tissue. Furthermore, by reducing sinus tachycardia it can lessen cytosolic calcium overload. Hence, beta-adrenergic blockade helps to prevent ventricular fibrillation in the early stages of acute myocardial infarction and protects from sudden death in the postinfarction phase. In congestive heart failure, abnormalities of cytosolic calcium patterns exist with cytosolic calcium overload. It is proposed that the adverse effects of phosphodiesterase inhibitors on the mortality rate in patients with congestive heart failure can be explained by increased rates of formation of cyclic AMP and the development of calcium-dependent arrhythmias. Because calcium is the ultimate messenger of cyclic AMP-induced arrhythmias and because cytosolic calcium is increased in heart failure, it will be difficult to develop positive inotropic agents that are free of the risk of sudden death.

Treatment of hypertension in pregnancy.

A better understanding of the hemodynamic abnormalities in gestational hypertension together with the use of effective antihypertensive agents have resulted in more rational therapeutic approaches and a substantial improvement in maternal and fetal welfare. In normal pregnancy, there is reduced vascular reactivity with peripheral pooling and decreased circulatory responses to pressor agents. These are prostacyclin-dependent processes. In gestational hypertension, the normal increase in plasma volume and cardiac output with pregnancy is attenuated and prostacyclin-dependent processes are impaired, resulting in persistent vasoconstriction, enhanced responses to pressor agonists, and failure to develop adequate uteroplacental interchange. Among the modern antihypertensive agents, alpha- and beta-adrenergic antagonists and calcium ion entry blockers have permitted safe and effective long-term blood pressure control with sustained fetal growth. The development of proteinuria that can occur in chronic hypertension or in previously normotensive women (toxemia of pregnancy) can be prevented by the use of beta-adrenergic blocking agents and possibly by low-dose aspirin (75 mg/day). Maternal prostacyclin-thromboxane imbalance, important in the pathogenesis of gestational hypertension, is corrected by low-dose aspirin treatment. With the prevention of pre-eclampsia, the adverse maternal and fetal prognosis in gestational hypertension has been improved.

A comparison of palpable and nonpalpable breast cancers.

Chi-square statistics were used to compare prognostic factors of 60 patients with nonpalpable breast cancer (NPBC) and 112 patients with palpable breast cancer. Noninvasive cancers were more frequent, tumor size was smaller, and nodal metastasis was significantly less frequent in the NPBC group. However, the frequency of nodal metastasis was similar when adjusted for size and grade. There was no significant difference in the incidence of age and menopausal status of the patients, histologic types, hormone receptor status, and histologic/nuclear grade between these two groups. The findings were consistent with the hypothesis that NPBCs are potentially lethal tumors and that mammograms detect them earlier, ie, these tumors are smaller, localized, and, therefore, more curable.