New horizons (Baltimore, Md.)
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ICU clinicians commonly make decisions that allocate resources. Because of the high cost of ICU care, these practitioners can expect to be involved in the growing dilemma of trying to meet increasing demand for healthcare services within financial constraints. In order to participate meaningfully in a societal discussion over fairness in allocating scare and expensive resources, ICU practitioners should have more than a superficial knowledge of the principles of distributive justice. ⋯ Portents of how society might be involved in the future of health care are illustrated by the argument that society should limit access to all therapies except palliative care solely on the basis of advanced age. Until an open consensus develops in U. S. society about how to allocate scarce healthcare resources, the delivery of ICU care will continue to be at risk of covert, de facto rationing based on ability to pay, race, or other nonmedical personal characteristics.
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End-of-life decisions in the ICU are often complex and emotionally charged. Intensivists can correct the physiologic abnormalities of acute and chronic illness with drugs and technology, and prolong life in many situations. ⋯ Studies on do-not-resuscitate orders, and advanced and delayed directives comprise a portion of this work. This article contains a brief summary of selected research evidence on these difficult end-of-life issues.
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Healthcare reform continues to move forward, with the influence of managed care increasing in most areas of the United States. Strategies for cost containment are being considered to limit marginally beneficial health care, including futile-care policies, capitation, preset limits on health care, and guidelines for writing do-not-resuscitate (DNR) orders. Recent studies which attempted to improve communication between patients and physicians have failed to improve the quality of end-of-life care offered by healthcare providers. ⋯ Moreover, approximately 0.5% of all ICU care could be limited should DNR orders be written earlier in a patient's hospital or ICU stay. In addition, a shift from open-format ICUs to semiclosed units managed by qualified critical care physician directors would reduce the number of patients with futile or failed cardiopulmonary resuscitation, and increase the number of patients having care withheld or withdrawn after failed ICU therapy. Such a change would result in more substantial savings.
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The aim of the present study was to explore methods, concepts, and techniques that provide recognition of circulatory deficiencies at the earliest possible time in the patient's illness. We used both the standard invasive pulmonary artery thermodilution catheter and noninvasive hemodynamic monitoring systems consisting of a new bioimpedance cardiac output device, pulse oximetry, transcutaneous oxygen (PtCO2) and carbon dioxide tensions as well as the transcutaneous oxygen tension/fraction of inspired oxygen ratio (PtCO2/FIO2). These three noninvasive systems were used to evaluate cardiac function, pulmonary function, and tissue perfusion, respectively. ⋯ We found that hypotensive shock usually was preceded by episodes of high flow followed by low flow and inadequate tissue perfusion indicated by reduced PtCO2; this frequent pattern was modified by associated co-morbid conditions, especially hypovolemia, limited cardiac reserve capacity, age, hypertensive states, and increased body metabolism from infection, trauma, stress, exercise, temperature, and endocrine disorders. Reduced pulmonary function occurred in 18% of emergency patients; these were usually patients with thoracic trauma, severe hypovolemia, head injuries, chronic obstructive pulmonary disease, asthma, drug overdose, and central nervous system failure (massive stroke and coma). We concluded that noninvasive measurements identify early circulatory problems reliably and provide objective criteria for physiologic analysis as well as for definition of therapeutic goals and titration of therapy.
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Multicenter Study
Application of total body bioimpedance to the critically ill patient. Brazilian Group for Bioimpedance Study.
In the past several years, considerable interest has developed in the study of total body bioimpedance analysis (TBBIA) and body composition in healthy subjects. This simple and noninvasive technique uses derived and regression equations to validate data comparative to the gold standards of total body water determination and body composition. However, this approach has not proved to be of value in the critically ill patient with distorted body composition under the effects of multiple drugs and interventions. ⋯ Some authors have demonstrated that this relation Xc/R is highly correlated with mortality and could be used for the staging of critically ill patients throughout their stay in the ICU. The role of TBBIA as a simple and noninvasive technique, and its implications for the management of critically ill patients are presented and discussed. Areas for future investigations, with single and multiple frequency, have the potential to clarify many aspects of this emergent technology at the bedside.