Critical care medicine
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Critical care medicine · May 1997
Comparative StudyWhole-body impedance cardiography in the measurement of cardiac output.
To evaluate the reliability of whole-body impedance cardiography with electrodes on wrists and ankles in the measurement of cardiac output compared with the thermodilution method. ⋯ There was close agreement between whole-body impedance cardiography and thermodilution in the measurement of cardiac output in patients with coronary artery disease without cardiac shunts and valvular lesions. The repeatability of the impedance method was significantly better than the repeatability of thermodilution. Whole-body impedance cardiography can be recommended for the assessment of cardiac output and its changes in the resting state. Whole-body impedance cardiography is a feasible and handy method for noninvasive and continuous measurement of cardiac output.
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Critical care medicine · May 1997
ReviewConsensus statement of the Society of Critical Care Medicine's Ethics Committee regarding futile and other possibly inadvisable treatments.
Society must always face the reality of limited medical resources and must find mechanisms for distributing these resources fairly and efficiently. One recent approach for distributing limited medical resources has been the development of policies that limit the availability of futile treatments. The objectives of this consensus statement are as follows: a) to define futility and thereby enable a clear discussion of the issues; and b) to identify principles and procedures for resolving cases in which life-sustaining treatment may be futile or inadvisable. ⋯ Treatments should be defined as futile only when they will not accomplish their intended goal. Treatments that are extremely unlikely to be beneficial, are extremely costly, or are of uncertain benefit may be considered inappropriate and hence inadvisable, but should not be labeled futile. Futile treatments constitute a small fraction of medical care. Thus, employing the concept of futile care in decision-making will not primarily contribute to a reduction in resource use. Nonetheless, communities have a legitimate interest in allocating medical resources by limiting inadvisable treatments. Communities should seek to do so using a rationale that is explicit, equitable, and democratic; that does not disadvantage the disabled, poor, or uninsured; and that recognizes the diversity of individual values and goals. Policies to limit inadvisable treatment should have the following characteristics: a) be disclosed in the public record; b) reflect moral values acceptable to the community; c) not be based exclusively on prognostic scoring systems; d) articulate appellate mechanisms; and e) be recognized by the courts. Healthcare organizations that control payment have a profound influence on treatment decisions and should formally address criteria for determining when treatments are inadvisable and should share accountability for those decisions.
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Critical care medicine · May 1997
Clinical TrialAdditive beneficial effects of the prone position, nitric oxide, and almitrine bismesylate on gas exchange and oxygen transport in acute respiratory distress syndrome.
To test the hypothesis that prone position ventilation, nitric oxide, and almitrine bismesylate, each acting by a different mechanism to improve arterial oxygenation, could exert additive beneficial effects when used in combination in patients with severe acute respiratory distress syndrome (ARDS). ⋯ In ARDS patients with severe hypoxemia, arterial oxygenation can be improved by combining the prone position, nitric oxide, and almitrine bismesylate, without deleterious effects.
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Critical care medicine · May 1997
Comparative StudyAdverse effects of interrupting precordial compression during cardiopulmonary resuscitation.
In the current operation of automated external defibrillators, substantial time may be consumed for a "hands off" interval during which precordial compression is discontinued to allow for automated rhythm analyses before delivery of the electric countershock. The effects of such a pause on the outcomes of cardiopulmonary resuscitation were investigated. ⋯ During resuscitation from ventricular fibrillation, prolongation of the interval between discontinuation of precordial compression and delivery of the first electric countershock substantially compromises the success of cardiac resuscitation. Accordingly, automated defibrillators are likely to be maximally effective if they are programmed to secure minimal "hands off" delay before delivery of the electric countershock.