Clinical intensive care : international journal of critical & coronary care medicine
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Clin Intensive Care · Jan 1994
Comparative StudyContinuous invasive cardiac output monitoring--the Baxter/Edwards Critical-Care Swan Ganz IntelliCath and Viligance system.
We evaluated the Baxter/Edwards Critical-Care Swan Ganz IntelliCath continuous cardiac output catheter and Vigilance continuous cardiac output monitor in critically ill adult intensive care patients, and compared cardiac output measurements obtained from this new system with those from a standard bolus thermodilution technique using cold normal saline. Nine Swan Ganz IntelliCath catheters were inserted into patients selected at random, following the decision that pulmonary artery catheter monitoring was required. A total of 100 comparisons were made in nine patients. ⋯ These larger than anticipated limits of agreement may not reflect any inaccuracy in the continuous measurement system, rather they may highlight the extent of well recognised potential errors inherent in the intermittent bolus technique. The availability of a system to measure cardiac output continuously provides a major improvement in intensive care monitoring. This system will permit the rapid and accurate assessment of the response of patients to therapy while providing increased diagnostic facilities and a new research tool.
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Clin Intensive Care · Jan 1994
Metabolic effects of continuous veno-venous haemofiltration in critically ill patients.
To evaluate the short-term metabolic and haemodynamic effects of continuous veno-venous haemofiltration (CVVH) in critically ill patients with acute renal failure (ARF). ⋯ CVVH does not affect metabolic rate and haemodynamic stability in critically ill patients. The lack of any effect on the metabolic rate and haemodynamic parameters in such patients may have significant clinical importance and it further attests to the suitability of CVVH for the treatment of critically ill patients.
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Clin Intensive Care · Jan 1994
Comparative StudyPrevention of atmospheric contamination during isoflurane sedation.
With a view to minimising staff exposure to exhaled isoflurane which had been used for sedation, we assessed the efficacy of either activated charcoal adsorption or active or passive mechanical scavenging systems in intensive care units (ICUs). Personal monitoring revealed minimal exposure of staff to the sedating agent. ⋯ The activated charcoal adsorbers functioned highly efficiently for at least 12-hour periods. With simple scavenging techniques, atmospheric isoflurane contamination during sedation with the agent remains well within an acceptable range and is unlikely to pose a health risk to nursing and medical staff.
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Clin Intensive Care · Jan 1994
Comparative StudyQuality of life at three months following admission to intensive and coronary care units.
Measurement of quality of life three months following critical illness, to assess impact on health expectations. ⋯ ICU patient quality of life three months after admission compares favourably with a corresponding group of CCU patients, particularly in areas of sleep and social isolation. CCU patients' general functional status deteriorated significantly compared to their pre-admission status. Critical illness is a costly area of medicine, but the results suggest that outcomes are beneficial in terms of quality of life for those surviving acute illness.
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Clin Intensive Care · Jan 1994
Oxygen extraction in patients with sepsis and heart failure: another look at clinical studies.
We collected all complete sets of measurements of cardiac index and oxygen-derived variables available in the recent literature (1975-1991; computerised Medline search) on critically ill patients with sepsis (n=21 studies), septic shock (n=20 studies) or severe heart failure (n=13 studies). For each study, the mean value for cardiac index, oxygen delivery (DO 2), oxygen uptake (VO 2), oxygen extraction ratio (O 2ER) and lactate concentration (when available) were analysed together with mortality rates. There was a significant relationship between VO 2 and DO 2 for the studies on patients with severe heart failure (r=0.79, p less than 0.001) or septic shock (r=0.55, p less than 0.01), but not in patients with sepsis (r=0.3, p=NS). ⋯ Furthermore, the positive relationship between O 2ER and lactate suggests that, despite the alterations in oxygen extraction capabilities in severe sepsis, mean O 2ER may be higher in the most severe cases of septic shock. This could reflect an attempt to maintain VO 2 when DO 2 is insufficient. The prevailing opinion that 0 2ER is a meaningless variable in septic shock needs to be reassessed.