The effectiveness of a brief intervention for intensive care unit patients with hazardous alcohol use: a randomized controlled trial

BACKGROUND

Screening for hazardous alcohol use and performing brief interventions (BIs) are recommended to reduce alcohol-related negative health consequences. We aimed to compare the effectiveness (defined as an at least 10% absolute difference) of BI with usual care in reducing alcohol intake in intensive care unit survivors with history of hazardous alcohol use.

METHODS

We used Alcohol Use Disorder Identification Test-Consumption (AUDIT-C) score to assess history of alcohol use.

PATIENTS

Emergency admitted adult ICU patients in three Finnish university hospitals, with an AUDIT-C score > 5 (women), or > 6 (men). We randomized consenting eligible patients to receive a BI or treatment as usual (TAU).

INTERVENTION

BI was delivered by the time of ICU discharge or shortly thereafter in the hospital ward.

CONTROLS

Control patients received TAU.

OUTCOME

The primary outcome was self-reported alcohol consumption during the preceding week 6 and 12 months after randomization. Secondary outcomes were the change in AUDIT-C scores from baseline to 6 and 12 months, health-related quality of life, and mortality. The trial was terminated early due to slow recruitment during the pandemic.

RESULTS

We randomized 234 patients to receive BI (N = 117) or TAU (N = 117). At 6 months, the median alcohol intake in the BI and TAU groups were 6.5 g (interquartile range [IQR] 0-141) and 0 g (0-72), respectively (p = 0.544). At 12 months, it was 24 g (0-146) and 0 g (0-96) in the BI and TAU groups, respectively (p = 0.157). Median change in AUDIT-C from baseline to 6 months was - 1 (- 4 to 0) and 2 (- 6 to 0), (p = 0.144) in the BI and TAU groups, and to 12 months - 3 (- 5 to - 1) and - 4 (- 7 to - 1), respectively (p = 0.187). In total, 4% (n = 5) of patients in the BI group and 11% (n = 13) of patients in the TAU group were abstinent at 6 months, and 10% (n = 12) and 15% (n = 17), respectively, at 12 months. No between-groups difference in mortality emerged.

CONCLUSION

As underpowered, our study cannot reject or confirm the hypothesis that a single BI early after critical illness is effective in reducing the amount of alcohol consumed compared to TAU. However, a considerable number in both groups reduced their alcohol consumption.

TRIAL REGISTRATION

ClinicalTrials.gov (NCT03047577).

Hazardous alcohol consumption and perioperative complications in a cardiac surgery patient. A retrospective study

BACKGROUND

We investigated the prevalence and effects of hazardous alcohol consumption on perioperative complications in cardiac surgery patients. Preoperative hazardous alcohol consumption has been associated with an increased risk of postoperative complications in noncardiac patient populations.

METHODS

We retrospectively collected data from the Finnish Intensive Care Consortium database and electronic patient records on all cardiac surgery patients treated in the intensive care units (ICUs) of Helsinki University Hospital (n = 919) during 2017. Data on preoperative alcohol consumption were routinely collected using the alcohol use disorder identification test consumption (AUDIT-C) questionnaire. We analyzed perioperative data and outcomes for any associations with hazardous alcohol consumption. Outcome measures were length of stay in the ICU, re-admissions to ICU, bleeding and infectious complications, and incidence of postoperative arrhythmias.

RESULTS

AUDIT-C scores were available for 758 (82.5%) patients, of whom 107 (14.1%) fulfilled the criteria for hazardous alcohol consumption (AUDIT-C score of 5/12 or higher for women and 6/12 or higher for men). Patients with hazardous alcohol consumption were younger, median age 59 (IQR 52.0-67.0) vs. 69.0 (IQR 63.0-74.0), p < .001, and more often men 93.5% vs. 71.9%, p < .001 than other patients and had an increased risk for ICU re-admissions [adjusted OR (aOR) 4.37 (95% CI, 1.60-11.95)] and severe postoperative infections aOR 3.26 (95% CI, 1.42-7.54).

CONCLUSION

Cardiac surgery patients with a history of hazardous alcohol consumption are younger than other patients and are predominantly men. Hazardous alcohol consumption is associated with an increased risk of severe postoperative infections and ICU re-admissions.

Comparison of the prognostic value of early-phase proton magnetic resonance spectroscopy and diffusion tensor imaging with serum neuron-specific enolase at 72 h in comatose survivors of out-of-hospital cardiac arrest-a substudy of the XeHypotheca trial

PURPOSE

We compared the predictive accuracy of early-phase brain diffusion tensor imaging (DTI), proton magnetic resonance spectroscopy (1H-MRS), and serum neuron-specific enolase (NSE) against the motor score and epileptic seizures (ES) for poor neurological outcome after out-of-hospital cardiac arrest (OHCA).

METHODS

The predictive accuracy of DTI, 1H-MRS, and NSE along with motor score at 72 h and ES for the poor neurological outcome (modified Rankin Scale, mRS, 3 - 6) in 92 comatose OHCA patients at 6 months was assessed by area under the receiver operating characteristic curve (AUROC). Combined models of the variables were included as exploratory.

RESULTS

The predictive accuracy of fractional anisotropy (FA) of DTI (AUROC 0.73, 95% CI 0.62-0.84), total N-acetyl aspartate/total creatine (tNAA/tCr) of 1H-MRS (0.78 (0.68 - 0.88)), or NSE at 72 h (0.85 (0.76 - 0.93)) was not significantly better than motor score at 72 h (0.88 (95% CI 0.80-0.96)). The addition of FA and tNAA/tCr to a combination of NSE, motor score, and ES provided a small but statistically significant improvement in predictive accuracy (AUROC 0.92 (0.85-0.98) vs 0.98 (0.96-1.00), p = 0.037).

CONCLUSION

None of the variables (FA, tNAA/tCr, ES, NSE at 72 h, and motor score at 72 h) differed significantly in predicting poor outcomes in this patient group. Early-phase quantitative neuroimaging provided a statistically significant improvement for the predictive value when combined with ES and motor score with or without NSE. However, in clinical practice, the additional value is small, and considering the costs and challenges of imaging in this patient group, early-phase DTI/MRS cannot be recommended for routine use.

TRIAL REGISTRATION

ClinicalTrials.gov NCT00879892, April 13, 2009.

Prevalence and impact of hazardous alcohol use in intensive care cohort: A multicenter, register-based study

BACKGROUND

Reports of the prevalence and impact of hazardous alcohol use among intensive care unit (ICU) patients are contradictory. We aimed to study the prevalence of hazardous alcohol use among ICU patients and its association with ICU length of stay (LOS) and mortality.

METHODS

Finnish ICUs have been using the Alcohol Use Disorder Identification Test-Consumption (AUDIT-C) to evaluate and record patients' alcohol use into the Finnish Intensive Care Consortium's Database (FICC). We retrieved data from the FICC from a 3-month period. We excluded data from centers with an AUDIT-C recording rate of less than 70% of admissions. We defined hazardous alcohol use as a score of 5 or more for women and 6 or more for men from a maximum score of 12 points.

RESULTS

Two thousand forty-five patients were treated in the 10 centers with an AUDIT-C recording rate of 70% or higher. AUDIT-C was available for 1576 (77%) patients and indicated hazardous alcohol use for 334 (21%) patients who were more often younger (median age 55 [interquartile range 42-65] vs 67 [57-74] [P < .001]) and male (78.1% vs 61.3% [P < .001]) compared to other patients. We found no difference in LOS or hospital mortality between hazardous and non-hazardous alcohol users. Among the non-abstinent, risk of death within a year increased with increasing AUDIT-C scores adjusted odds ratio 1.077 (95% confidence interval, 1.006-1.152) per point.

CONCLUSION

The prevalence of hazardous alcohol use in Finnish ICUs was 21%. Patients with hazardous alcohol use were more often younger and male compared with non-hazardous alcohol users.

Effect of Inhaled Xenon on Cardiac Function in Comatose Survivors of Out-of-Hospital Cardiac Arrest-A Substudy of the Xenon in Combination With Hypothermia After Cardiac Arrest Trial

This explorative substudy aimed at determining the effect of inhaled xenon on left ventricular function by echocardiography in comatose survivors of out-of-hospital cardiac arrest.

DESIGN

A randomized two-group single-blinded phase 2 clinical drug trial.

SETTING

A multipurpose ICU in two university hospitals.

PATIENTS

Of the 110 randomized comatose survivors after out-of-hospital cardiac arrest with a shockable rhythm in the xenon in combination with hypothermia after cardiac arrest trial, 38 patients (24-76 yr old) with complete echocardiography were included in this study.

INTERVENTIONS

Patients were randomized to receive either inhaled xenon combined with hypothermia (33°C) for 24 hours or hypothermia treatment alone. Echocardiography was performed at hospital admission and 24 ± 4 hours after hypothermia.

MEASUREMENTS AND MAIN RESULTS

Left ventricular ejection fraction, myocardial longitudinal systolic strain, and diastolic function were analyzed blinded to treatment. There were 17 xenon and 21 control patients in whom echocardiography was completed. Clinical characteristics did not differ significantly between the groups. At admission, ejection fraction was similar in xenon and control patients (39% ± 10% vs 38% ± 11%; p = 0.711) but higher in xenon than control patients after hypothermia (50% ± 10% vs 42% ± 10%; p = 0.014). Global longitudinal systolic strain was similar in xenon and control patients at admission (-9.0% ± 3.8% vs -8.1% ± 3.6%; p = 0.555) but better in xenon than control patients after hypothermia (-14.4.0% ± 4.0% vs -10.5% ± 4.0%; p = 0.006). In patients with coronary artery disease, longitudinal strain improved in the nonischemic myocardial segments in xenon patients. There were no changes in diastolic function between the groups.

CONCLUSIONS

Among comatose survivors of a cardiac cause out-of-hospital cardiac arrest, inhaled xenon combined with hypothermia was associated with greater recovery of left ventricular systolic function in comparison with hypothermia alone.

Prevalence of risk-drinking in critically ill patients, screened with carbohydrate-deficient transferrin and AUDIT-C score: A retrospective study

Background Studies demonstrate that up to one-third of intensive care unit (ICU) admissions are directly or indirectly related to alcohol. Screening for alcohol use is not routine. This study examined the prevalence of elevated %CDT (carbohydrate-deficient transferrin) and above risk-level AUDIT-C (Alcohol Use Disorders Identification Test, Consumption) in patients admitted to ICU. Methods We conducted a retrospective analysis of clinical and laboratory data from a single ICU where %CDT and AUDIT-C were included in routine assessment. After excluding readmissions, 2532 adult patients from a 21-month period were included. Admission values of %CDT were available for 2049 patients, and AUDIT-C was available for 1617 patients. The association of %CDT and AUDIT-C with short- and long-term outcome was studied by using univariate and multivariate logistic regression analysis. Results %CDT was above the reference value in 23.7% (486/2048) of patients with available %CDT. Of patients with available AUDIT-C, 33% (544/1617) had a risk-level AUDIT-C score. Patients with a risk-level AUDIT-C score were significantly younger than those with a lower score (51 vs 64 years, P < .0001). Increased %CDT was associated with higher severity of illness. AUDIT-C was associated independently with increased risk of long-term mortality in multivariate analysis (P = .007). Conclusion One in three of ICU patients are risk-level alcohol users as measured with AUDIT-C score, and one in four are analysed with %CDT. The prevalence varies according to the method used and any method alone may be insufficient to detect risk-level consumption reliably. Editorial Comment Alcohol overconsumption is associated with need for ICU admission and with less favorable outcomes. Diagnosis of alcohol overconsumption though is problematic due to low sensitivity in screening. In a pilot study, a biomarker and a screening tool are compared. The finding is that multiple tools are needed to achieve an adequate sensitivity for detection.

Capnocytophaga canimorsus bacteremia: clinical features and outcomes from a Helsinki ICU cohort

BACKGROUND

Capnocytophaga canimorsus is a gram-negative rod capable of causing severe sepsis or septic shock. We studied the characteristics of patients with C. canimorsus bacteremia treated in intensive care unit (ICU).

METHODS

Patients with C. canimorsus bacteremia in the Helsinki University Hospital district from 2005 to 2014 were retrospectively reviewed using laboratory database and electronical patient records.

RESULTS

We identified 65 patients with C.canimorsus bacteremia. Of these, 16 (25%) were treated in an ICU. The most commonly affected organ systems were coagulation (94%) and kidney (69%). Mortality of ICU treated patients was 19%. Three survivors underwent lower limb amputations for gangrene. Only 25% of the patients were immune-compromised, but alcohol abuse was common (69%). All patients had a contact with dogs, but only 37% had a history of a dog-bite.

CONCLUSION

Capnocytophaga canimorsus infection may present with severe sepsis or septic shock with organ dysfunction, most frequently coagulopathy and acute kidney injury. Previously recognized risk factors are not always present. A dog in a household may be a sufficient exposure for developing a severe form of the disease. The possibility of C. canimorsus infection should be considered in patients with any contact with dogs, even in immunocompetent patients.

Effect of Inhaled Xenon on Cerebral White Matter Damage in Comatose Survivors of Out-of-Hospital Cardiac Arrest: A Randomized Clinical Trial

IMPORTANCE

Evidence from preclinical models indicates that xenon gas can prevent the development of cerebral damage after acute global hypoxic-ischemic brain injury but, thus far, these putative neuroprotective properties have not been reported in human studies.

OBJECTIVE

To determine the effect of inhaled xenon on ischemic white matter damage assessed with magnetic resonance imaging (MRI).

DESIGN, SETTING, AND PARTICIPANTS

A randomized single-blind phase 2 clinical drug trial conducted between August 2009 and March 2015 at 2 multipurpose intensive care units in Finland. One hundred ten comatose patients (aged 24-76 years) who had experienced out-of-hospital cardiac arrest were randomized.

INTERVENTIONS

Patients were randomly assigned to receive either inhaled xenon combined with hypothermia (33°C) for 24 hours (n = 55 in the xenon group) or hypothermia treatment alone (n = 55 in the control group).

MAIN OUTCOMES AND MEASURES

The primary end point was cerebral white matter damage as evaluated by fractional anisotropy from diffusion tensor MRI scheduled to be performed between 36 and 52 hours after cardiac arrest. Secondary end points included neurological outcome assessed using the modified Rankin Scale (score 0 [no symptoms] through 6 [death]) and mortality at 6 months.

RESULTS

Among the 110 randomized patients (mean age, 61.5 years; 80 men [72.7%]), all completed the study. There were MRI data from 97 patients (88.2%) a median of 53 hours (interquartile range [IQR], 47-64 hours) after cardiac arrest. The mean global fractional anisotropy values were 0.433 (SD, 0.028) in the xenon group and 0.419 (SD, 0.033) in the control group. The age-, sex-, and site-adjusted mean global fractional anisotropy value was 3.8% higher (95% CI, 1.1%-6.4%) in the xenon group (adjusted mean difference, 0.016 [95% CI, 0.005-0.027], P = .006). At 6 months, 75 patients (68.2%) were alive. Secondary end points at 6 months did not reveal statistically significant differences between the groups. In ordinal analysis of the modified Rankin Scale, the median (IQR) value was 1 (1-6) in the xenon group and 1 (0-6) in the control group (median difference, 0 [95% CI, 0-0]; P = .68). The 6-month mortality rate was 27.3% (15/55) in the xenon group and 34.5% (19/55) in the control group (adjusted hazard ratio, 0.49 [95% CI, 0.23-1.01]; P = .053).

CONCLUSIONS AND RELEVANCE

Among comatose survivors of out-of-hospital cardiac arrest, inhaled xenon combined with hypothermia compared with hypothermia alone resulted in less white matter damage as measured by fractional anisotropy of diffusion tensor MRI. However, there was no statistically significant difference in neurological outcomes or mortality at 6 months. These preliminary findings require further evaluation in an adequately powered clinical trial designed to assess clinical outcomes associated with inhaled xenon among survivors of out-of-hospital cardiac arrest.

TRIAL REGISTRATION

clinicaltrials.gov Identifier: NCT00879892.

Esophageal Ulcer as a Cause of Death: A Population-Based Study. Mortality of Esophageal Ulcer Disease

BACKGROUND

This study aimed at defining the mortality and the nature of fatal complications that arise out of esophageal ulcer for one clearly defined geographical area.

METHODS

In this national, population-based study, the occurrence of fatal esophageal ulcer or ulcer requiring hospital treatment between January 1987 and December 2000 was assessed by the use of Finland's administrative databases. Medical records provided etiology of fatal ulcer and agonal symptoms.

RESULTS

Due to an esophageal ulcer, 2,242 patients received treatment in Finnish hospitals, at an annual frequency of 3.2/100,000. Ulcer with hemorrhage (53.5%), perforation (38.4%), or aspiration pneumonia (2.3%) was the cause of death in 86 patients for an annual mortality of 0.12/100,000. Based on the number of ulcers treated, 3.8% cases ended fatally. Gastroesophageal reflux disease (GERD) seemed to be the etiologic factor for ulcer in 68 (79.0%) patients. The most common agonal symptoms were hematemesis (41.8%), abdominal pain (25.6%), melaena (22.1%), and dyspnea (17.4%). Twenty (23.3%) patients were found dead at home.

CONCLUSION

The rarity of the disease, related disorders, and the diversity of symptoms make the complicated esophageal ulcer a diagnostic challenge. Effective monitored treatment for severe GERD may be an important step to prevent fatal outcome.

Accuracy of Sequential Organ Failure Assessment (SOFA) scoring in clinical practice

BACKGROUND

The Sequential Organ Failure Assessment (SOFA) score is used to quantify the severity of illness daily during intensive care. Our aim was to evaluate how accurately SOFA is recorded in clinical practice, and whether this can be improved by a refresher course in scoring rules.

METHODS

The scores recorded by physicians in a university hospital intensive care unit (ICU) were compared with the gold standard determined by two expert assessors. Data concerning all consecutive patients during two 6-week-long observation periods (baseline and after the refresher course) were compared.

RESULTS

SOFA was accurate on 75/158 (48%) patient days at baseline. The cardiovascular, coagulation, liver, and renal component scores showed excellent accuracy (>or=82%, weighted kappa >or=0.92), while the neurological score showed only moderate (70%, weighted kappa 0.51) and the respiration score showed good accuracy (75%, weighted kappa 0.79). After the refresher course, the number of >or=2 point errors decreased (P<0.01). Sedation precluded neurological evaluation on 135/311 (43%) days. The accuracy of the assumed neurological scores was lower than those based on timely data: 89/135 (66%, weighted kappa 0.55) vs. 125/176 (71%, weighted kappa 0.81) (P<0.01).

CONCLUSION

Only half of the SOFA scores were accurate. In most cases, they were accurate enough to allow the recognition of organ failure and detection of change. The component scores showed good to excellent accuracy, except the neurological score. After the refresher course, the results improved slightly. The moderate accuracy of the neurological score was not amended. A simpler neurological classification tool than the Glasgow Coma Scale is needed in the ICU.

Severe hypoglycemia during intensive insulin therapy

BACKGROUND

Tight glycemic control reduces mortality in surgical intensive care patients and in long-term medical intensive care patients. A large study on intensive insulin therapy was prematurely discontinued due to safety issues. As the safety of intensive insulin therapy has been questioned, we screened all patients during a 17-month period to reveal the incidence of hypoglycemia and its effects on the outcome of the patients.

METHODS

All patients treated between February 2005 and June 2006 in two intensive care units (ICUs) of a tertiary care teaching hospital were included in the study. A nurse-driven intensive insulin therapy with a target blood glucose level of 4-6 mmol/l had been introduced earlier. The patients were divided into two groups according to the presence of severe hypoglycemia (<or=2.2 mmol/l).

RESULTS

One thousand two hundred and twenty-four patients (1124 treatment periods) were included. During the study period, 61,203 blood glucose measurements were performed, 2.6% of which were below and 52.6% above the target range. Severe hypoglycemia (glucose <or=2.2 mmol/l) occurred in 25 patients (36 measurements). The incidence was 0.06% of the measurements and 2.3% of the patients. The median age, sex, Acute Physiology And Chronic Health Evaluation II, Simplified Acute Physiology Score II, diagnosis category, ICU or hospital length of stay did not differ between the groups. The hospital mortalities were 25% and 15% in patients with or without severe hypoglycemia, respectively (P=0.16).

CONCLUSION

Severe hypoglycemia during intensive insulin therapy is rare in clinical practice compared with previous clinical trials.

Process of foregoing life-sustaining treatment: a survey among Scandinavian intensivists

BACKGROUND

How ethical issues are dealt with varies considerably depending on the geographic and religious background of individuals. The views of Scandinavian physicians on end-of-life care were studied using a survey. The aim of this study was to clarify the actual processes of foregoing life-sustaining treatment in Scandinavia.

METHODS

A questionnaire was developed and sent to 78 intensive care physicians working in Denmark, Finland, Norway and Sweden.

RESULTS

Forty-four responses were obtained (13 from Denmark, eight from Finland, 12 from Norway and 11 from Sweden); 89% of the respondents were from University Hospitals. Withholding and withdrawing of treatment were practiced in all intensive care units (ICUs) concerned, but written guidelines on end-of-life care existed in only one ICU. End-of-life care is usually arranged in the ICU. Religious support is available in most hospitals during office hours, but lacking in 26% of ICUs outside office hours. Vasoactive medication, renal replacement therapy, and artificial nutrition are among the therapies most likely to be discontinued during withdrawal of life support. Certain types of monitoring and organ support are still continued in many centers during end-of-life care.

CONCLUSION

Local written guidelines on end-of-life care are scarce in Scandinavian ICUs, which may explain the observed variability in the practices. Development of guidelines and monitoring how these instructions are carried out may help to improve the quality of care of dying ICU patients.

HMGB1 as a predictor of organ dysfunction and outcome in patients with severe sepsis

OBJECTIVE

To study the predictive value of high mobility group box-1 protein (HMGB1) and hospital mortality in adult patients with severe sepsis.

STUDY DESIGN

Prospective observational cohort study in 24 ICUs in Finland.

PATIENTS

Two hundred and forty-seven adult patients with severe sepsis.

MEASUREMENTS AND MAIN RESULTS

Blood samples for HMGB1 analyses were drawn from 247 patients at baseline and from 210 patients 72 h later. The mean APACHE II and SAPS II scores were 24 (SD 9) and 44 (SD 17), respectively. The hospital mortality was 26%. The serum HMGB1 concentrations were measured first by semi-quantitative Western immunoblotting (WB) analysis. The median HMGB1 concentration on day 0 was 108% (IQR 98.5-119) and after 72 h 107% (IQR 98.8-120), which differed from healthy controls (97.5%, IQR 91.3-106.5; p=0.028 and 0.019, respectively). The samples were re-analysed by ELISA (in a subgroup of 170 patients) to confirm the results by WB. The median concentration in healthy controls was 0.65 ng/ml (IQR 0.51-1.0). This was lower than in patients with severe sepsis (3.6 ng/ml, IQR 1.9-6.5, p< 0.001). HMGB1 concentrations (WB and ELISA) did not differ between hospital survivors and non-survivors. In ROC analyses for HMGB1 levels (WB) on day 0 and 72 h with respect to hospital mortality, the areas under the curve were 0.51 and 0.56 (95% CI 0.40-0.61 and 0.47-0.65).

CONCLUSIONS

Serum HMGB1 concentrations were elevated in patients with severe sepsis, but did not differ between survivors and non-survivors and did not predict hospital mortality.

Decrease of mortality of ruptured abdominal aortic aneurysm after centralization and in-hospital quality improvement of vascular service

Our aim was to determine whether organizational changes could improve the outcome after ruptured abdominal aortic aneurysm (RAAA). Regional centralization and quality improvement in the in-hospital chain of treatment of RAAA included strengthening of the emergency preparedness and better availability of postoperative intensive care. During the reorganization, all patients with RAAA were admitted to Helsinki University Central Hospital (HUCH) from Helsinki and Uusimaa district. RAAA patients in the hospital district of Helsinki and Uusimaa between 1996 and 2004 were identified. The study period was divided into three periods: I, control; II, change; and III, present. Of the total of 626 patients with RAAA, 352 (56%) were admitted to the HUCH, of whom 315 (90%) underwent surgery. During the study period, population-based mortality decreased from 77% to 56% (P < 0.001) and 90-day mortality, from 54% to 28% (P = 0.002). Operative 30-day mortality was 19% during the third period and lower than previously (P = 0.001). Our results seem to argue in favor of centralization of emergency vascular services with adequate manpower and operative expertise in the first line and with availability of closed-unit postoperative critical care to achieve better results as these measures were associated with a positive impact on survival.

Acute Renal Injury and Dysfunction Following Elective Abdominal Aortic Surgery

OBJECTIVES

To evaluate the incidence of kidney injury and acute renal dysfunction (ARD) and associated risk factors in open abdominal aortic surgery.

MATERIALS AND METHODS

69 patients undergoing elective infrarenal aortic repair were included in a prospective study. Anaesthesia and haemodynamic management were standardised targeting a mean arterial pressure (MAP) of 70-90 mmHg, pulmonary artery occlusion pressure of 12-14 mmHg and cardiac index >or=2.4 l/min/m(2). Urinary albumin-creatinine and N-acetyl-B-D-glucosaminidase-creatinine ratios were measured as indicators of kidney injury. The definition of ARD was based on the RIFLE criteria.

RESULTS

Kidney injury was found in most patients. ARD developed in 22% of the patients, and acute renal failure in 4%. The patients with ARD were older, and had lower plasma creatinine and estimated GFR before surgery. ARD was associated with intraoperative hypotension (MAP <60 mmHg >15 min), low cardiac index (<2.4 l/min/m(2)), rhabdomyolysis, and early reoperation. Intraoperative hypotension and postoperative low cardiac output were independent risk factors for ARD in multivariate analysis.

CONCLUSIONS

Kidney injury occurs in most patients undergoing infrarenal aortic surgery, but only 22% develop acute renal dysfunction. Hypotension and low cardiac output are risk factors that could be avoided by optimizing perioperative management.

Collagenase 2/matrix metalloproteinase 8 in critically ill patients with secondary peritonitis

Secondary peritonitis is an important indication for surgical intensive care admissions, and it is associated with high morbidity and mortality. Collagenase 2/matrix metalloproteinase (MMP) 8 is a tissue matrix-degrading enzyme that is released from leukocytes upon inflammatory stimuli and may thus contribute to peritonitis-associated organ damage. We studied the levels and activity of MMP-8 in the peritoneal fluid of 15 critically ill patients with secondary peritonitis. The MMP-8 levels were measured from the patients' peritoneal fluid, serum, and urine, and from the serum and urine of 10 healthy controls by immunofluorometric assay. Median MMP-8 level in peritoneal fluid supernatant was 1,317 microg/L (interquartile range [IQR]) (1,254-1,359 microg/L) being significantly higher than in the sera of the patients (P=0.008). Molecular forms and isoform distribution of MMP-8, MMP-1, and MMP-13 in peritoneal fluid, assessed by Western immunoblotting, revealed that the neutrophil-type MMP-8 was the major collagenase species in peritoneal fluid, and it was partially in an activated form. Catalytically competent, active MMP-8 produced the characteristic cleavage products from intact human type I collagen. The serum levels of MMP-8 were higher in the patients, 49 microg/L (IQR, 23-214 microg/L), than in the controls, 11 microg/L (IQR, 8-24 microg/L) (P<0.01). The MMP-8 levels in the urine were higher in the patients, 0.27 microg/L (IQR, 0.04-1.89 microg/L), than in the controls, 0.03 microg/L (IQR, 0.0-0.05 microg/L) (P=0.013). Our data demonstrate for the first time that MMP-8 levels are remarkably elevated and in an active and catalytically competent form in the peritoneal fluid samples of patients with secondary peritonitis.

Organ dysfunction and long term outcome in secondary peritonitis

BACKGROUND AND AIMS

Secondary peritonitis is still associated with high mortality, especially when multiorgan dysfunction complicates the disease. Good prognostic tools to predict long term outcome in individual patients are lacking and therefore require further study.

PATIENTS AND METHODS

163 consecutive patients with secondary peritonitis were included, except those with postoperative or traumatic peritonitis. In 58 patients treated in the intensive care unit (ICU), organ dysfunction was quantified using Sequential Organ Failure Assessment (SOFA) score in the first 4 days. Predictive factors for poor outcome were evaluated in all patients. Hospital and 1-year mortality was assessed.

RESULTS

Hospital mortality was 19% and 1-year mortality 23%. Acute physiology and chronic health evaluation II (APACHE II), previous functional status, and sepsis category were predictive of fatal outcome in the total cohort (p = 0.034, p < 0.001, and p < 0.001). In patients treated in the ICU, advanced age and admission SOFA score were independent predictors of death (p = 0.014, p < 0.0001). The SOFA score showed the best discriminative ability for poor outcome (AuROC 0.78).

CONCLUSION

Degree of organ dysfunction measured using SOFA score was the best predictor of hospital mortality in patients suffering from secondary peritonitis.

Intra-abdominal pressure in severe acute pancreatitis

BACKGROUND

Hospital mortality in patients with severe acute pancreatitis (SAP) remains high. Some of these patients develop increased intra-abdominal pressure (IAP) which may contribute to organ dysfunction. The aims of this study were to evaluate the frequency of increased IAP in patients with SAP and to assess the development of organ dysfunction and factors associated with high IAP.

METHODS

During 2001-2003 a total of 59 patients with severe acute pancreatitis were treated in the intensive care unit (ICU) of Helsinki University Hospital. IAP was measured by the intravesical route in 37 patients with SAP. Data from these patients were retrospectively reviewed.

RESULTS

Maximal IAP, APACHE II score, maximal SOFA score, maximal creatinine, age and maximal lactate were significantly higher in nonsurvivors. There was a significant correlation of the maximal IAP with the maximal SOFA, APACHE II, maximal creatinine, maximal lactate, base deficit and ICU length of stay. Patients were divided into quartiles according to the maximal IAP. Maximal IAP was 7-14, 15-18, 19-24 and 25-33 mmHg and the hospital mortality rate 10%, 12.5%, 22.2% and 50% in groups 1-4, respectively. A statistically significant difference was seen in the maximal SOFA, ICU length of stay, maximal creatinine and lactate values. The mean ICU-free days in groups 1-4 were 45.7, 38.8, 32.0 and 27.5 days, respectively. The difference between groups 1 and 4 was statistically significant.

CONCLUSION

In patients with SAP, increased IAP is associated with development of early organ failure reflected in increased mortality and fewer ICU-free days. Frequent measurement of IAP during intensive care is important in optimizing abdominal perfusion pressure and recognizing patients potentially benefitting from decompressive laparotomy.

Quality assessment of sedation in intensive care

BACKGROUND

In the intensive care unit (ICU), analgesia and sedation are used to improve the comfort and safety of patients undergoing intensive care therapies. However, continuous administration of sedatives prolongs the time on mechanical ventilation and ICU stay. These adverse effects can be reduced by clear definition of the goals of sedation combined with a sedation protocol.

METHODS

The adherence to the local sedation guideline of a university affiliated ICU was monitored prospectively before and after intervention: reinforcement of the guideline. The primary endpoints of the study were the occurrence of daily interruption or tapering of sedation and achievement of the target Ramsay scale level (days: 2-3, nights: 3-4) according to the guideline.

RESULTS

Comparing sedation before and after the intervention (166 and 170 ICU days), no significant differences were observed in the occurrence of daily interruption or tapering of sedatives, 94/129 (73%) vs. 109/139 (78%) of sedation days, nor in the Ramsay scale level during the day, 4 (3-5) vs. 4 (3-5), or in the night, 5 (4-5) vs. 5 (4-5), respectively. After the intervention, Ramsay scale recordings were made more frequently, 280/398 (70%) vs. 234/380 (62%) of the nurses' shifts (P < 0.01).

CONCLUSION

Adherence to the local sedation guideline was not high, and no significant change was seen after this simple intervention. Continuous education and discussion on the desirable and undesirable effects of sedation, followed by multidisciplinary re-evaluation of the current guideline, are due in our unit.

Comparison of 2 acute renal failure severity scores to general scoring systems in the critically ill

BACKGROUND

Several proposed definitions for acute renal failure (ARF) exist, but little is known of their significance in clinical practice. We evaluated the ability to predict hospital mortality in 2 ARF-specific severity-of-illness scoring methods, the Risk, Injury, Failure, Loss, End-Stage Renal Disease (RIFLE) score and the score presented by Bellomo et al in 2001.

METHODS

The study included 668 consecutive patients with 694 treatment episodes treated in 2 intensive care units (ICUs) in a university hospital within 11 months. ARF prevalence was classified according to the RIFLE and Bellomo scores. As references, we evaluated 2 general severity-of-illness scoring systems, the admission Acute Physiology and Chronic Health Evaluation II (APACHE II) and Sequential Organ Failure Assessment (SOFA) scores.

RESULTS

Admission SOFA scores and maximum RIFLE scores for the first 3 days in the ICU were independent predictors of hospital mortality by means of forward conditional logistic regression. In receiver operating characteristic analysis, SOFA and APACHE II scores performed better than ARF-specific scores, and discriminative powers for hospital mortality were only moderate for the RIFLE and Bellomo scores: areas under the curve were 0.653 (95% confidence interval, 0.588 to 0.719) and 0.587 (95% confidence interval, 0.514 to 0.660), respectively.

CONCLUSION

Neither of the ARF-specific scoring methods presented good discriminative power regarding hospital mortality. However, maximum RIFLE score for the first 3 days in the ICU was found to be an independent predictor of hospital mortality, along with admission SOFA score.

Corticosteroids combined with continuous veno-venous hemodiafiltration for treatment of hantavirus pulmonary syndrome caused by Puumala virus infection

Reported here are two cases of hantavirus pulmonary syndrome caused by Puumala virus infection, which rapidly resolved after initiation of corticosteroid treatment combined with continuous veno-venous hemodiafiltration. These cases emphasize the role of the inflammatory response in the pathogenesis of hantavirus pulmonary syndrome.

Gastropericardial Fistula, Purulent Pericarditis, and Cardiac Tamponade After Laparoscopic Nissen Fundoplication

Gastropericardial fistula, purulent pericarditis, and cardiac tamponade developed 7 years after laparoscopic Nissen fundoplication. The patient was successfully managed through a thoracotomy by open drainage of the pericardium, excision and closure of the fistula, and an omentum flap.

Prediction of survival after 48-h of intensive care following open surgical repair of ruptured abdominal aortic aneurysm

OBJECTIVE

To identify predictive factors for 30-day mortality after 48 h of maximal treatment in intensive care unit (ICU) after repair for ruptured abdominal aortic aneurysm (RAAA).

DESIGN

Retrospective study in the ICU of the university central hospital.

MATERIALS AND METHODS

Between 1999 and 2003, a total of 197 patients were admitted to emergency unit due to RAAA, and 185 of them underwent open surgical repair. A total of 138 patients survived at least 48-h and were included in a study to identify factors predictive of 30-day mortality by logistic regression analysis.

RESULTS

Thirty-day mortality of all RAAA patients was 46% (87/197) whereas the 30-day mortality for those alive at 48 h was 22% (31/138). Forward stepwise multivariate logistic regression analysis revealed that only organ dysfunction by SOFA score (sequential organ failure assessment) at 48-h, preoperative Glasgow Aneurysm Score, and supra-renal clamping in operation were independent predictors of death.

CONCLUSIONS

Degree of organ dysfunction by SOFA score was the best predictor of 30-day mortality in RAAA patients alive at 48-h after open surgical repair.

Ethical issues in intensive care--a survey among Scandinavian intensivists

BACKGROUND

The general principles of medical ethics are universally accepted. In practice, however, there is variation on how these principles are interpreted by people with different cultural backgrounds. The aim of this study was to document the views of Scandinavian intensive care physicians on intensive care unit (ICU) admission, triage, withholding and withdrawal of intensive care, and communication between the patient, the family and the ICU team.

METHODS

A questionnaire was developed and sent to 84 intensive care physicians working in Denmark, Finland, Sweden and Norway.

RESULTS

The response rate was 61%. In general, the responses were in agreement with published guidelines. Nevertheless, there was considerable variation on what factors are taken into account when priority decisions are made. In addition, the views on the content of information provided to the family varied. A majority of 80% reported priority decisions being made on a regular basis. Less than one-half of the respondents had correct knowledge regarding the existence or lack of national guidelines on intensive care ethics. Only 8% of the respondents were aware of guidelines published by the Society of Critical Care Medicine.

CONCLUSION

Variation in priority determinants between individual physicians may compromise justice in health care. An effort should be made to discuss and adopt mutual principles. In addition, the quality of information available to the patients' representatives deserves our attention. The results of this study could be used as a basis for discussion when guidelines on the ethical aspects of intensive care are developed and reviewed.

Predictive value of interleukins 6, 8 and 10, and low HLA-DR expression in acute renal failure

AIMS

HLA-DR expression and plasma levels of pro- and anti-inflammatory cytokines (IL-6, IL-8 and IL-10) and their predictive value concerning survival of critically ill systemic inflammatory response syndrome (SIRS) patients with and without acute renal failure (ARF) were evaluated.

MATERIAL

A total of 103 consecutive adult patients with SIRS from 2 university hospital intensive care units participated in the study.

METHOD

Laboratory data for all patients were prospectively collected on the day of admission and 2 days thereafter. Patients with acute renal failure (ARF) and non-ARF patients were compared by Mann-Whitney U-test. Independent predictors of mortality were tested using forward stepwise logistic multiple regression analysis. The discriminative power of different variables was tested using receiver operating characteristic (ROC) curve analysis.

RESULTS

ARF developed in 36 patients (35%). ARF patients showed significantly lower HLA-DR expression and higher plasma levels of IL-6, IL-8 and IL-10 than non-ARF patients. In ARF, moderate discriminative power in predicting survival was observed for day 2 IL-6 and IL-10 plasma levels (AUCs 0.703 and 0.749, respectively).

CONCLUSIONS

We found no clinically significant discriminative power in predicting survival of ARF patients for monocyte HLA-DR expression or cytokine plasma levels. Therefore, our results do not support the use of HLA-DR expression or cytokine plasma levels for that purpose.

Predictive value of monocyte histocompatibility leukocyte antigen-DR expression and plasma interleukin-4 and -10 levels in critically ill patients with sepsis

It has been suggested that excessive activation of the anti-inflammatory pathways in sepsis may lead to poor outcome of patients with sepsis. The aim of this study was to test the value of histocompatibility leukocyte antigen (HLA)-DR-expression on blood monocytes and plasma levels of interleukin (IL)-4 and -10 in prediction of hospital mortality in patients with sepsis. Sixty-one critically ill patients with sepsis were prospectively enrolled to this study in two university hospital intensive care units. Survivors (n = 41) and nonsurvivors (n = 20) differed significantly in HLA-DR expression at admission: survivors' median 84% (interquartile range 64%-98%) versus nonsurvivors' median 62% (interquartile range 47%-83%, P = 0.025 by Mann-Whitney test). Similarly, the analysis revealed statistically significant differences between survivors and nonsurvivors in admission plasma IL-10 levels and in admission Sequential Organ Failure Assessment (SOFA) and Acute Physiology and Chronic Health Evaluation (APACHE) II scores, but not in IL-4 levels. The areas under receiver operating curves (AUC) showed that both monocyte HLA-DR expression and plasma IL-4 level showed poor discriminative power in prediction of hospital mortality (AUC < 0.70). Only IL-10 levels on days 1 and 2 showed reasonable predictive power (AUCs 0.706 and 0.725, respectively). The highest AUC values were those of APACHE-II (0.786) and admission SOFA score (0.763). In conclusion, APACHE II and SOFA scores on admission showed better discriminatory power than HLA-DR expression and IL-10 and IL-4 levels in prediction of hospital mortality in critically ill patients with sepsis.

Predictive value of procalcitonin and interleukin 6 in critically ill patients with suspected sepsis

OBJECTIVE

To evaluate the performance of procalcitonin (PCT), interleukin-6 (IL-6), C-reactive protein, leukocyte count, D-dimer, and antithrombin III at onset of septic episode and 24 h later in prediction of hospital mortality in critically ill patients with suspected sepsis.

DESIGN AND SETTING

Prospective, cohort study in two university hospital intensive care units.

PATIENTS

61 critically ill patients with suspected sepsis.

MEASUREMENTS AND RESULTS

The outcome measure was hospital mortality. Hospital survivors ( n=41) and nonsurvivors ( n=20) differed statistically significantly on day 1 (admission) in PCT, IL-6, SOFA score, and APACHE II score, and 24 h later in PCT, IL-6, and D-dimer values. AT III, CRP, and leukocyte count did not differ. The areas under receiver operating curves showed reasonable discriminative power (>0.75) in predicting hospital mortality only for day 2 IL-6 (0.799) and day 2 PCT (0.777) values which were comparable to that of APACHE II (0.786), and which remained the only independent predictor of mortality.

CONCLUSIONS

Admission and day 2 IL-6, and day 2 PCT, and day 2 D-dimer values differed significantly between hospital survivors and nonsurvivors among critically ill patients with suspected sepsis. However, in prediction of hospital mortality, only the discriminative power of day 2 PCT and IL-6 values, and APACHE II was reasonable as judged by AUC analysis (>0.75).

The effect of insulin cardioplegia on atrial fibrillation after high-risk coronary bypass surgery: a double-blinded, randomized, controlled trial

Atrial fibrillation after coronary bypass (CABG) surgery is an important cause of morbidity and increased resource utilization. Insulin-enhanced cardioplegia may reduce postoperative arrhythmias by improving aerobic myocardial metabolism and mitigating the deleterious effects of ischemia. We performed a double-blinded, randomized, controlled clinical trial to determine if insulin-enhanced cardioplegia decreases the risk of post-CABG atrial fibrillation in a high-risk patient population. We randomized 501 patients undergoing urgent CABG to receive insulin-enhanced (Humulin R 10 IU/L, Insulin group, n = 243) or standard (Control group, n = 258) blood cardioplegia during cardiopulmonary bypass. Patients were monitored by using continuous electrocardiography for a minimum of 3 days postoperatively. All standard cardiac medications, including beta-adrenergic blockers, were continued postoperatively. Insulin-enhanced cardioplegia did not result in a significant reduction in postoperative atrial fibrillation. Furthermore, we failed to detect a difference in the incidence of conduction defects, ventricular tachycardia, or pacemaker requirements between insulin and placebo patients. Atrial fibrillation was the most common arrhythmia, occurring in 31% of all patients. Independent predictors of atrial fibrillation were elderly age, preoperative atrial fibrillation, and renal insufficiency. Right bundle branch block was the most common conduction abnormality. Predictors of right bundle branch block were elderly age, female sex, and circumflex coronary artery disease. The incidence of postoperative ventricular tachycardia, left bundle branch block, and permanent pacemaker requirement was small. We conclude that insulin-enhanced cardioplegia does not reduce the incidence of postoperative atrial fibrillation in high-risk CABG patients.

IMPLICATIONS

We conducted a double-blinded, randomized, placebo-controlled trial of insulin-enhanced cardioplegia in 501 patients undergoing urgent coronary bypass surgery. Insulin did not decrease the incidence of postoperative atrial fibrillation when compared with placebo. We also failed to demonstrate a difference in the incidence of other postoperative arrhythmias between the two groups of patients.

Intramucosal pH and endotoxin and cytokine release in severe acute pancreatitis

It has been postulated that in severely ill patients splanchnic hypoperfusion may cause endotoxin release from the gut, and this leakage of endotoxin into the circulation can trigger the cascade of inflammatory cytokines. We tested this hypothesis in 9 patients with acute severe pancreatitis by monitoring gastric intramucosal pH (pHi) as measure of splanchnic hypoperfusion at 12-h intervals trying to correlate it to endotoxin and cytokine release. Only 3 of 59 samples, obtained from 3 patients contained circulating endotoxin. Thirteen of 15 plasma samples drawn at pHi <7.20 did not contain endotoxin. The pHi was significantly lower in patients who subsequently developed 3 or more organ failures (P = 0.0017, analysis of variance). Although endotoxemia was only occasionally found, most patients had measurable interleukin 1beta (IL-1beta), interleukin 6 (IL-6), interleukin 8 (IL-8), and interleukin 10 (IL-10) in their plasma. Concentrations of IL-6, IL-8, and IL-10 on admission correlated to degree of organ dysfunction as measured by the multiple organ system failure score (P = 0.035, r = 0.74; P = 0.010, r = 0.91; P = 0.021, r = 0.82, respectively). In conclusion, patients with acute, severe pancreatitis often have splanchnic hypoperfusion and produce a wide array of cytokines despite a rare occurrence of endotoxemia.

Interleukin 1 receptor antagonist and E-selectin concentrations: a comparison in patients with severe acute pancreatitis and severe sepsis

PURPOSE

This prospective clinical study was designed to compare interleukin 1 receptor antagonist (IL-1ra) and E-selectin concentrations in patients with severe acute pancreatitis to those with severe sepsis.

MATERIALS AND METHODS

Nine consecutive patients with severe acute pancreatitis and 11 consecutive patients with severe sepsis admitted to a medical/surgical intensive care unit were included in the study. Plasma concentrations of IL-1ra and E-selectin were serially measured daily for 7 days or throughout their stay in the intensive care unit if shorter.

RESULTS

The concentrations of IL-1ra were significantly higher on admission in patients with severe sepsis compared with the patients with severe pancreatitis (median levels 10,500 and 2,600 pg/mL, respectively, P = .007). When the data from the first 3 days were analyzed using analysis of variance (ANOVA), the levels of IL-1ra and E-selectin were similar in both groups. The concentrations of IL-1ra and E-selectin correlated to the development of multiorgan dysfunction as assessed by sequential organ failure assessment (SOFA) score (P = .032 and .043, respectively).

CONCLUSION

This study shows that IL-1ra and E-selectin are released in acute severe pancreatitis, and the levels seem to be comparable to those in patients with severe sepsis. Concentrations of IL-1ra and E-selectin correlate to the development of multiorgan failure as indicated by high SOFA scores during the first week of disease.

Plasma interleukin-8, interleukin-10, and E-selectin levels in neutropenic and non-neutropenic bacteremic patients

Plasma interleukin-8 (IL-8) interleukin-10 (IL-10), and E-selectin concentrations were studied in 39 neutropenic and 30 non-neutropenic bacteremic patients; 54 nonbacteremic patients were analyzed as controls. Interleukin-8 concentrations were significantly higher in neutropenic than in non-neutropenic bacteremic patients (median 475 vs. 0 pg/ml, p < 0.0001). Median IL-8 and IL-10 levels were higher in bacteremic than in non-bacteremic patients (330 vs. 0 pg/ml, p < 0.0001 and 20 vs. 0 pg/ml, p = 0.04, respectively). In contrast, concentrations of IL-10 were similar in neutropenic and non-neutropenic patients. Median levels of E-selectin were not increased in any of the patient groups. Neutropenic bacteremic patients showed significantly lower concentrations of E-selectin than did non-neutropenic bacteremic patients (p < 0.0001). In conclusion, neutropenic bacteremic patients had significantly higher concentrations of IL-8 than non-neutropenic bacteremic patients. Levels of IL-10 were higher in bacteremic than in nonbacteremic patients, but neutropenic and non-neutropenic patients had similar levels of IL-10. Increased levels of E-selectin were not found in any of the patient groups, although neutropenic patients with bacteremia had lower concentrations than did non-neutropenic patients.

Plasma endotoxin and cytokine levels in neutropenic and non-neutropenic bacteremic patients

Plasma endotoxin, tumor necrosis factor-alpha (TNF-alpha), interleukin 1 beta (IL-1 beta), interleukin 1 receptor antagonist (IL-1ra), and interleukin 6 (IL-6) concentrations in 69 bacteremic patients were compared with those in 54 nonbacteremic patients suffering from suspected bacterial infections. Only three (11%) of the 27 patients with gram-negative bacteremia showed detectable levels of endotoxin. TNF-alpha was detected in 6% of the bacteremic patients and in none of the nonbacteremic patients. Median IL-6 levels were significantly higher in bacteremic than in nonbacteremic patients (55 vs. 0 pg/ml, p = 0.0008). IL-6 concentrations were similar in neutropenic and non-neutropenic bacteremic patients (median 55 vs. 74 pg/ml). In contrast, neutropenic bacteremic patients had significantly lower concentrations of IL-1ra than non-neutropenic bacteremic patients (250 vs. 1,950 pg/ml, p < 0.0001). Patients with fatal bacteremia had significantly higher concentrations of IL-6 and IL-1ra than the survivors (median, 450 vs. 40, p = 0.012 and 7,600 vs. 420 pg/ml, p = 0.0075, respectively). Determinations of endotoxin or TNF-alpha in patients with suspected bacteremia failed to offer clinically relevant data on the prognosis of these patients. IL-6 levels correlated with both the presence of bacteremia and the risk of death. Granulocytopenic patients with bacteremia had lower levels of circulating IL-1ra than patients with normal granulocyte counts, and these levels correlated with poor outcome.

Plasma concentration and protein binding of alfentanil during high-dose infusion for cardiac surgery

We have studied plasma protein binding of alfentanil in 10 patients given a mean total dose of 949 micrograms kg-1 as the principal anaesthetic agent for coronary artery bypass grafting. The mean unbound fraction of plasma alfentanil increased from 0.09 to 0.16 after administration of heparin and to 0.26 after beginning cardiopulmonary bypass (CPB). After CPB until the end of surgery, the unbound fraction decreased to 0.12. These changes in the unbound fraction were associated with significant changes in plasma total and unbound concentrations of alfentanil also. Within the first 1 min of CPB, total alfentanil concentration had decreased by more than the unbound concentration and the decrease observed in the latter disappeared rapidly. From induction of anaesthesia until awakening of the patient, plasma protein binding of alfentanil was related significantly (P = 0.0166) to the serum concentration of orosomucoid (alpha 1-acid glyco-protein).