Quality indicators in intensive care medicine for Germany - fourth edition 2022

The measurement of quality indicators supports quality improvement initiatives. The German Interdisciplinary Society of Intensive Care Medicine (DIVI) has published quality indicators for intensive care medicine for the fourth time now. After a scheduled evaluation after three years, changes in several indicators were made. Other indicators were not changed or only minimally. The focus remained strongly on relevant treatment processes like management of analgesia and sedation, mechanical ventilation and weaning, and infections in the ICU. Another focus was communication inside the ICU. The number of 10 indicators remained the same. The development method was more structured and transparency was increased by adding new features like evidence levels or author contribution and potential conflicts of interest. These quality indicators should be used in the peer review in intensive care, a method endorsed by the DIVI. Other forms of measurement and evaluation are also reasonable, for example in quality management. This fourth edition of the quality indicators will be updated in the future to reflect the recently published recommendations on the structure of intensive care units by the DIVI.

The future development of intensive care quality indicators - a methods paper

Introduction: Medical quality indicators (QI) are important tools in the evaluation of medical quality. Their development is subject to specific methodological requirements, which include practical applicability. This is especially true for intensive care medicine with its complex processes and their interactions. This methods paper presents the status quo and shows necessary methodological developments for intensive care QI. For this purpose, a cooperation with the Association of the Scientific Medical Societies' Institute for Medical Knowledge Management (AWMF-IMWi) was established. Methodology: Review of published German manuals for QI development from guidelines and narrative review of quality indicators with a focus on evidence and consensus-based guideline recommendations. Future methodological adaptations of indicator development for improved operationalization, measurability and pilot testing are presented, and a development process is proposed. Results: The development of intensive care quality indicators in Germany is based on an established process. In the future, additional evaluation criteria (QUALIFY criteria) will be applied to assess the evidence base. In addition, a continuous exchange between the national steering committee of the DIVI responsible for QI development and guideline development groups involved in intensive care medicine is planned. Conclusion: Intensive care quality indicators will have to meet improved methodological requirements in the future by means of an improved development process. Future QI development is intended to improve the structure of the development process, with a focus on scientific evidence and a link to guideline projects. This is intended to achieve the goal of a broad application of QI and to further evaluate its relevance for patient outcome and performance of institutions.

[Stressors for patients in the intensive care unit : An analysis taking controllability into consideration]

OBJECTIVE

Studies on stress factors for patients in intensive care units (ICU) have so far concentrated on whether certain stressors have occurred or how stressful they were. There are no studies on stress for patients in ICUs that measured both the perception of stress and the chances perceived to control it; however, loss of control can result in long-term psychopathological consequences, such as depression or posttraumatic stress disorder. Therefore, a questionnaire was developed to evaluate the influence of controllability on perception of stress. The aim of this study was to answer the following questions: which situations were experienced as stressful by patients in ICUs, whether patients perceived them as being controllable and whether the experience of stress depended on the controllability? Furthermore, it was examined which stressful situations are specific to ICUs.

MATERIAL AND METHODS

The questionnaire included 18 potentially stressful situations for ICU patients. These situations were assessed with respect to the occurrence, frequency and duration, the impact of stress and the perception of control. In addition, anxiety was assessed using STAI-X1. A total of 198 ICU patients and 100 patients hospitalized in a general surgery ward were interviewed.

RESULTS

Patients in ICUs remembered significantly more stressful situations than those on the normal ward (M ± SD = 10.2 ± 2.7 vs. 6.6 ± 2.0; d = 1.48; p < 0.001) and perceived them as more stressful (mean stress: M ± SD = 3.6 ± 1.5 vs. 2.2 ± 1.3; d = 1.01; p < 0.001). The most stressful situations for ICU patients were fixation of the arms (M ± SD = 7.47 ± 3.27), mechanical ventilation (M ± SD = 7.36 ± 3.29) and endotracheal suctioning (M ± SD = 7.19 ± 2.99). Approximately one third of patients underwent these situations. Situations experienced by more than 90% of ICU patients were evaluated as being the least stressful experiences, including infusion (M ± SD = 2.7 ± 2.7), measuring heart activity (M ± SD = 2.3 ± 2.7), taking blood samples (M ± SD = 2.2 ± 2.7), and temperature control (M ± SD = 0.9 ± 1.7). Controllability experienced by ICU patients negatively correlated with anxiety (r = -0.20, p = 0.004) and mean sensation of stress (r = -0.36; p < 0.001). When comparing stress levels of ICU patients who perceived controllability in a given situation to those who did not, the greatest effects (Cohen's d > 1.4) were observed for the situations presence of a bed barrier (M ± SD = 0.1 ± 0.4 vs. 5.9 ± 2.8), lighting at night (M ± SD = 0.7 ± 1.7 vs. 5.7 ± 3.3), presence of a ventilation tube (M ± SD = 2.5 ± 2.1 vs. 6.7 ± 3.0) and repositioning of the patient (M ± SD = 2.5 ± 2.9 vs. 6.7 ± 2.9).

CONCLUSION

The experience of loss of control seems to negatively modify the impact of stressors. Thus, an increase in aspects of controllability could reduce the burden on patients during intensive care.

Clinical Nutrition in Critical Care Medicine - Guideline of the German Society for Nutritional Medicine (DGEM)

PURPOSE

Enteral and parenteral nutrition of adult critically ill patients varies in terms of the route of nutrient delivery, the amount and composition of macro- and micronutrients, and the choice of specific, immune-modulating substrates. Variations of clinical nutrition may affect clinical outcomes. The present guideline provides clinicians with updated consensus-based recommendations for clinical nutrition in adult critically ill patients who suffer from at least one acute organ dysfunction requiring specific drug therapy and/or a mechanical support device (e.g., mechanical ventilation) to maintain organ function.

METHODS

The former guidelines of the German Society for Nutritional Medicine (DGEM) were updated according to the current instructions of the Association of the Scientific Medical Societies in Germany (AWMF) valid for a S2k-guideline. According to the S2k-guideline classification, no systematic review of the available evidence was required to make recommendations, which, therefore, do not state evidence- or recommendation grades. Nevertheless, we considered and commented the evidence from randomized-controlled trials, meta-analyses and observational studies with adequate sample size and high methodological quality (until May 2018) as well as from currently valid guidelines of other societies. The liability of each recommendation was described linguistically. Each recommendation was finally validated and consented through a Delphi process.

RESULTS

In the introduction the guideline describes a) the pathophysiological consequences of critical illness possibly affecting metabolism and nutrition of critically ill patients, b) potential definitions for different disease phases during the course of illness, and c) methodological shortcomings of clinical trials on nutrition. Then, we make 69 consented recommendations for essential, practice-relevant elements of clinical nutrition in critically ill patients. Among others, recommendations include the assessment of nutrition status, the indication for clinical nutrition, the timing and route of nutrient delivery, and the amount and composition of substrates (macro- and micronutrients); furthermore, we discuss distinctive aspects of nutrition therapy in obese critically ill patients and those treated with extracorporeal support devices.

CONCLUSION

The current guideline provides clinicians with up-to-date recommendations for enteral and parenteral nutrition of adult critically ill patients who suffer from at least one acute organ dysfunction requiring specific drug therapy and/or a mechanical support device (e.g., mechanical ventilation) to maintain organ function. The period of validity of the guideline is approximately fixed at five years (2018-2023).

[DGEM Guideline "Clinical Nutrition in Critical Care Medicine" - short version]

PURPOSE

Variations of clinical nutrition may affect outcome of critically ill patients. Here we present the short version of the updated consenus-based guideline (S2k classification) "Clinical nutrition in critical care medicine" of the German Society for Nutritional Medicine (DGEM) in cooperation with 7 other national societies. The target population of the guideline was defined as critically ill adult patients who suffer from at least one acute organ dysfunction requiring specific drug therapy and/or a mechanical support device (e.g. mechanical ventilation) to maintain organ function.

METHODS

The former guidelines of the German Society for Nutritional Medicine (DGEM) were updated according to the current instructions of the Association of the Scientific Medical Societies in Germany (AWMF) valid for a S2k-guideline. We considered and commented the evidence from randomized-controlled trials, meta-analyses and observational studies with adequate sample size and high methodological quality (until May 2018) as well as from currently valid guidelines of international societies. The liability of each recommendation was indicated using linguistic terms. Each recommendation was finally validated and consented by a Delphi process.

RESULTS

The short version presents a summary of all 69 consented recommendations for essential, practice-relevant elements of clinical nutrition in the target population. A specific focus is the adjustment of nutrition according to the phases of critical illness, and to the individual tolerance to exogenous substrates. Among others, recommendations include the assessment of nutritional status, the indication for clinical nutrition, the timing, route, magnitude and composition of nutrition (macro- and micronutrients) as well as distinctive aspects of nutrition therapy in obese critically ill patients and those with extracorporeal support devices.

CONCLUSION

The current short version of the guideline provides a concise summary of the updated recommendations for enteral and parenteral nutrition of adult critically ill patients who suffer from at least one acute organ dysfunction requiring pharmacological and/or mechanical support. The validity of the guideline is approximately fixed at five years (2018 - 2023).

[Peer Review for Quality Management in Intensive Care Medicine]

We report on the German Peer Review procedure for the quality management of Intensive Care Wards. The third up-date of the quality-indicators was published in 2017. The Peer Review Procedure, its organization, the development of quality indicators in Germany and their benefit for the patients is introduced.

DGEM-Leitlinie: „Klinische Ernährung in der Intensivmedizin“

Fragestellung Die enterale und parenterale Ernährungstherapie kritisch kranker Patienten kann u. a. durch den Zeitpunkt des Beginns, die Wahl des Applikationswegs, die Menge und Zusammensetzung der Makro- und Mikronährstoffzufuhr sowie der Wahl spezieller, immunmodulierender Nährsubstrate variieren. Die Durchführung der Ernährungstherapie nimmt Einfluss auf den klinischen Ausgang dieser Patienten. Ziel der vorliegenden Leitlinie ist es, aktualisierte konsensbasierte Empfehlungen zur klinischen Ernährung kritisch kranker, erwachsener Patienten, die an mindestens einer akuten, medikamentös und/oder mechanisch unterstützungspflichtigen Organdysfunktion leiden, zu geben.

Methodik Die früheren Leitlinien der Deutschen Gesellschaft für Ernährungsmedizin (DGEM) wurden in Einklang mit den aktuellen Richtlinien der Arbeitsgemeinschaft der Wissenschaftlichen Medizinischen Fachgesellschaften e. V. (AWMF) als S2k-Leitlinie aktualisiert. Entsprechend der S2k-Klassifikation dieser Leitlinie enthalten die dargestellten Empfehlungen keine Angabe von Evidenz- und Empfehlungsgraden, da keine systematische Aufbereitung der Evidenz zugrunde gelegt wurde. Als Grundlage für die Empfehlungen wurden insbesondere die seit Erscheinen der letzten DGEM-Leitlinien Intensivmedizin publizierten randomisiert-kontrollierten Studien und Metaanalysen, Beobachtungsstudien mit angemessener Fallzahl und hoher methodologischer Qualität (bis Mai 2018) sowie aktuell gültige Leitlinien anderer Fachgesellschaften herangezogen und kommentiert. Die Empfehlungsstärke ist rein sprachlich beschrieben. Jede Empfehlung wurde mittels Delphi-Verfahren abschließend bewertet und konsentiert.

Ergebnisse Die Leitlinie beschreibt einführend die pathophysiologischen Konsequenzen einer kritischen Erkrankung, welche den Metabolismus und die Ernährbarkeit der Patienten beeinflussen können, ferner die Definitionen unterschiedlicher Erkrankungsphasen im Krankheitsverlauf und sie diskutiert methodologische Aspekte zu ernährungsmedizinischen Studien. In der Folge werden 69 konsentierte Empfehlungen zu wesentlichen, praxisrelevanten Elementen der klinischen Ernährung kritisch kranker Patienten gegeben, darunter die Beurteilung des Ernährungszustands, die Indikation für die klinische Ernährungstherapie, der Beginn und Applikationsweg der Nahrungszufuhr, die Menge und Art der zugeführten Substrate (Makro- und Mikronährstoffe) sowie ernährungstherapeutische Besonderheiten bei adipösen kritisch kranken Patienten und Patienten mit mechanischen Unterstützungssystemen.

Schlussfolgerung Mit der Leitlinie werden aktuelle Handlungsempfehlungen zur enteralen und parenteralen Ernährung erwachsener Patienten geben, die an mindestens einer akuten, medikamentös und/oder mechanisch unterstützungspflichtigen Organdysfunktion leiden. Die Gültigkeit der Leitlinie beträgt voraussichtlich 5 Jahre (2018 – 2023).

Quality indicators in intensive care medicine for Germany - third edition 2017

Quality improvement in medicine is depending on measurement of relevant quality indicators. The quality indicators for intensive care medicine of the German Interdisciplinary Society of Intensive Care Medicine (DIVI) from the year 2013 underwent a scheduled evaluation after three years. There were major changes in several indicators but also some indicators were changed only minimally. The focus on treatment processes like ward rounds, management of analgesia and sedation, mechanical ventilation and weaning, as well as the number of 10 indicators were not changed. Most topics remained except for early mobilization which was introduced instead of hypothermia following resuscitation. Infection prevention was added as an outcome indicator. These quality indicators are used in the peer review in intensive care, a method endorsed by the DIVI. A validity period of three years is planned for the quality indicators.

Measurement and Calculation of the Extracorporeal Elimination of Vancomycin During Continuous Venovenous Hemodiafiltration and Continuous Venovenous Hemofiltration in Critically Ill Patients

Six surgical intensive care patients with continuous renal replacement therapy and therapy with vancomycin entered the prospective clinical study. The first day the patients were treated with continuous venovenous hemodiafiltration (CVVHDF) and the second day with continuous venovenous hemofiltration (CVVH). Three patients received 500 mg and three patients received 1000 mg of vancomycin every 12 hours. Monoclonal fluorescence polarization immunoassay (AxSYM) of vancomycin levels was performed from serum and dialysate/ultrafiltrate (during CVVHDF) or ultrafiltrate (during CVVH). Blood flow was 90 ml/hr, substitution 1 L/hr predilution, dialysate flow 1 L/hr (CVVHDF). The extracorporeal elimination of vancomycin during CVVHDF and CVVH is nearly linear but shows wide interindividual variation. The extracorporeal clearance of vancomycin was 24.2 ± 3.1 ml/min during CVVHDF (total clearance 60.4 ±18.1 ml/min) and 14.5 ± 2.4 ml/min during CVVH (total clearance 50.2 ± 14.9 ml/min). Intraindividual comparison revealed a significantly higher elimination of vancomycin by CVVHDF (p < 0.028). Peak serum vancomycin levels in patients receiving vancomycin 1g/day were 24.7 ± 5.3 μg/ml (CVVH) and 23.1 ± 5.2 μg/ml (CVVHDF), and with 2 g/day were 33.5 ± 2.7 μg/ml (CVVH) and 27.3 ±4.1 μg/ml (CVVHDF). The daily excreted amount of vancomycin during CVVHDF (r2 = 0.950, p = 0.01) and CVVH (r2 = 0.947, p = 0.01) can be calculated from a vancomycin level in the ultrafiltrate/dialysate outlet (CVVHDF) or the ultrafiltrate (CVVH) 8 hours after dosing. The 8-hour concentration of vancomycin in the ultrafiltrate from CVVH (or ultrafiltrate/dialysate from CVVHDF) during continuous renal replacement therapy serves as a basis for predicting extracorporeal elimination within 24 hours for the individual patient. Since critically ill patients show wide interindividual and intraindividual differences in the volume of distribution, clearance, and elimination half-life of vancomycin during therapy, the estimation of serum levels remains a necessity.

[Adequate fluid resuscitation in septic shock with high catecholamine doses]

BACKGROUND

Appropriate fluid resuscitation is a fundamental aspect for the hemodynamic management of septic shock patients and should ideally be achieved before vasopressors and positive inotropic substances are administered. The development of hemodynamic monitoring has revealed that in some cases patients had been improperly treated with high-dose catecholamines for initially insufficient fluid resuscitation. The aim of this study was to show that in some cases it is possible to actively reduce catecholamines by a volume challenge adapted according to the individual patient needs.

MATERIAL AND METHODS

In this retrospective observational study 29 patients with septic shock in a surgical intensive care unit (ICU) at a university hospital (17 male, 12 female, mean age 71 ± 10 years) on high-dose catecholamines (median values norepinephrine 0.204 µg/kg body weight/min, dobutamine 3.876 µg/kg/min and epinephrine 0.025 µg/kg/min, ranging up to 0.810 µg/kg/min, 22.222 µg/kg/min and 0.407 µg/kg/min in 28, 20 and 17 patients, respectively) were analyzed. The extremities of the patients were initially cold with a mottled marbled appearance whereas the mean arterial pressure (MAP) was ≥ 65 mmHg. The median central venous pressure (CVP) was 17 mmHg (range 55-34 mmHg) and the mean lactate concentration was 2.78 mmol/l (range 0.93-10.67 mmol/l). The standard therapy concept consisted of a forced volume challenge combined with active reduction of catecholamines to achieve an adequate fluid loading status, guided by the passive leg raising test (PLR), clinical signs and in 19 cases by hemodynamic monitoring (pulmonary artery catheter Vigilance II(™) n = 10, FloTrac(™), Vigileo(™) n = 9 and PreSep(™) n = 5; Edwards Life Sciences). The forced volume challenge was stopped after clinical improvement with rewarmed extremities, increasing diuresis volumes and lack of improvement by PLR.

RESULTS

Catecholamine doses could be significantly reduced in all patients: norepinephrine to 0 µg/kg/min, dobutamine to 1.852 µg/kg/min and epinephrine to 0 µg/kg/min (up to 0.133 µg/kg/min, 6.289 µg/kg/min and 0.091 µg/kg/min, respectively, p < 0.05 Wilcoxon signed rank test). Volume challenge test: + 4,500 ml Ringer solution (range 0-24,000 ml) and 1,000 ml hydroxyethyl starch (range 0-2,500 ml) and mean fluid balance + 6,465 ml (range + 2,040 ml to + 27,255 ml). The median weaning time from catecholamines was 12 h (range 4-43 h). After treatment all patients showed rewarmed extremities and a decrease in mean lactate levels from 2.78 mmol/l (range 0.93-10.67 mmol/l) to 2.05 mmol/l (range 0.7-5.4 mmol/l). The measured hemodynamic constellations showed clear interindividual differences but no cardiac deterioration occurred. The median oxygenation index (paO2/FiO2) showed a statistically insignificant change from 264 mmHg (range 75-418 mmHg) to 250 mmHg (range 120-467 mmHg). Of the patients 20 survived and 9 died.

CONCLUSION

It is possible to wean a substantial proportion of septic shock patients from high-dose catecholamines in combination with a needs-adapted forced volume challenge test. The importance of appropriate fluid loading prior to the use of high catecholamine doses should be a main subject of discussion in patients with severe septic shock and was confirmed in this study. This should be oriented to clinical and if possible, hemodynamic parameters and should not be underestimated.

Voluntary peer review as innovative tool for quality improvement in the intensive care unit--a retrospective descriptive cohort study in German intensive care units

Introduction: Quality improvement and safety in intensive care are rapidly evolving topics. However, there is no gold standard for assessing quality improvement in intensive care medicine yet. In 2007 a pilot project in German intensive care units (ICUs) started using voluntary peer reviews as an innovative tool for quality assessment and improvement. We describe the method of voluntary peer review and assessed its feasibility by evaluating anonymized peer review reports and analysed the thematic clusters highlighted in these reports.

Methods: Retrospective data analysis from 22 anonymous reports of peer reviews. All ICUs – representing over 300 patient beds – had undergone voluntary peer review. Data were retrieved from reports of peers of the review teams and representatives of visited ICUs. Data were analysed with regard to number of topics addressed and results of assessment questionnaires. Reports of strengths, weaknesses, opportunities and threats (SWOT reports) of these ICUs are presented.

Results: External assessment of structure, process and outcome indicators revealed high percentages of adherence to predefined quality goals. In the SWOT reports 11 main thematic clusters were identified representative for common ICUs. 58.1% of mentioned topics covered personnel issues, team and communication issues as well as organisation and treatment standards. The most mentioned weaknesses were observed in the issues documentation/reporting, hygiene and ethics. We identified several unique patterns regarding quality in the ICU of which long-term personnel problems und lack of good reporting methods were most interesting

Conclusion: Voluntary peer review could be established as a feasible and valuable tool for quality improvement. Peer reports addressed common areas of interest in intensive care medicine in more detail compared to other methods like measurement of quality indicators.

[Limitations of modern surgical intensive care medicine]

The attitude of humility in the context of surgical intensive care medicine incorporates a serving attitude towards the patient and the recognition of limitations in intensive care medicine. Limitations are set in the indications for intensive care medicine, in that which is medically possible and reasonable as well as ethically by the will of the patient which is binding for physicians. Furthermore, there are limitations due to available resources, due to the personal knowledge and abilities of the physician and the intensive care treatment team and due to the equipment in the intensive care ward. It is absolutely necessary to recognize and avoid futile care because this involves the use of resources which will be lost for the care of other patients who would profit from intensive care. The formal difficulties in the definition and determination of futile care are discussed.

The German quality indicators in intensive care medicine 2013--second edition

Quality indicators are key elements of quality management. The quality indicators for intensive care medicine of the German Interdisciplinary Society of Intensive Care Medicine (DIVI) from the year 2010 were recently evaluated when their validity time expired after two years. Overall one indicator was replaced and further three were in part changed. The former indicator I “elevation of head of bed” was replaced by the indicator “Daily multi-professional ward rounds with the documentation of daily therapy goals” and added to the indicator IV “Weaning and other measures to prevent ventilator associated pneumonias (short: Weaning/VAP Bundle)” (VAP = ventilator-associated pneumonia) which aims at the reduction of VAP incidence. The indicator VIII “Documentation of structured relative-/next-of-kin communication” was refined. The indicator X “Direction of the ICU by a specially trained certified intensivist with no other clinical duties in a department” was also updated according to recent study results. These updated quality indicators are part of the Peer Review in intensive care medicine. The next update of the quality indicators is due in 2016.

Volumentherapie in der Sepsis: Wann ist das Limit erreicht?

<b><i>Hintergrund: </i></b>Die Endpunkte der Volumentherapie bei schwerer Sepsis und septischem Schock sind nicht selten Gegenstand kontroverser Diskussionen am Krankenbett. <b><i>Methode: </i></b>Anhand der Leitlinien und der aktuellen Literatur werden die Zielparameter sowie die durch Volumentherapie erreichbaren Wirkungen und Nebenwirkungen vorgestellt. <b><i>Ergebnisse: </i></b>Werden die Zielparameter der Volumentherapie in der Sepsis nicht in den ersten 6 h erreicht, ist ein erweitertes hämodynamisches Monitoring zur Überwachung der Vorlast und der Volumenreagibilität sowie der Gewebsoxygenierung indiziert. Eine Überinfusion führt nicht selten zu grotesken Anasarka und Nebenwirkungen am Herz, an der Lunge und im Abdomen, die lebensbedrohliche Ausmaße annehmen können. <b><i>Schlussfolgerung: </i></b>Die Grenzen der Volumentherapie sind nicht nur in hämodynamischen Zielparametern zu sehen, sondern auch in den Nebenwirkungen der Volumentherapie, die im Rahmen der Sepsisbehandlung nicht sämtlich vermieden, aber in ihren Auswirkungen begrenzt werden können.

Diffuse postoperative peritonitis -- value of diagnostic parameters and impact of early indication for relaparotomy

Objective

Current criteria for performing relaparotomy for suspected peritonitis are non explicit and based on non-quantitative, subjective arguments or hospital practice. The aim of this study was to determine the value of routinely used clinical and diagnostic parameters in early detection of postoperative, diffuse peritonitis (PP). Furthermore, the prognosis and outcome after early indication for relaparotomy in patients with PP compared to community-aquired peritonitis (CAP) was evaluated.

Methods

Between 1999 and 2008, a total of 251 patients with diffuse secondary peritonitis either postoperative (PP) or community acquired (CAP) were analyzed retrospectively. PP (n = 114) and CAP (n = 137) were compared regarding physical examination, MPI-Score, APACHE II-Score, evidence of organ failure, laboratory parameters, diagnostic instruments and clinical course. The treatment regimen comprised surgical source control (with/without programmed lavage), abdominal closure and relaparotomy on demand, broad spectrum antibiotic therapy and intensive care support.

Results

The APACHE II-Score (20 CAP vs. 22 PP, p = 0.012), MPI-Score (27 CAP vs. 30 PP, p = 0.001) and the number of lavages differed significantly. Positive phyiscal testing and signs of sepsis [abdominal pain (81.6% PP vs. CAP 97.1%, p = 0.03), rebound tenderness (21.9% vs. 35.8%, p = 0.02), fever (35.1% vs. 51.8%, p = 0.03)] occurred significantly less often in the PP patients than in the CAP group. Conventional radiography (66.2%) and ultrasonography (44.3%) had a lower diagnostic sensitivity than did abdominal CT-scan (97.2%). Mortality was higher in the PP group but did not differ significantly between the two groups (47.4% PP vs. 35.8% CAP, p = 0.06).

Conclusion

The value of physical tests and laboratory parameters in diagnosing abdominal sepsis is limited. CT-scanning revealed the highest diagnostic accuracy. A treatment regimen of early relaprotomy appears to be the most reasonable strategy for as early discovery of postoperative peritonitis as possible.

[Delirium and intensive care unit syndrome]

Delirium and intensive care unit (ICU) syndrome are frequently seen postoperatively, especially in intensive care. Hospital mortality and complication rates are higher in patients with these disorders. Delirium is characterized by disturbance of consciousness and cognition and short development time. Drugs, drug withdrawal, and manifold metabolic syndromes may be causative. Knowledge of differential diagnosis and causality is essential for curative therapy. Drug therapy is recommended for the treatment of psychotic symptoms and vegetative disorders.

Release of vancomycin and teicoplanin from a plasticized and resorbable gelatin sponge: in vitro investigation of a new antibiotic delivery system with glycopeptides

BACKGROUND

The aim of this study was to evaluate the efficacy of sustained release of vancomycin and teicoplanin from a resorbable gelatin glycerol sponge, in order to establish a new delivery system for local anti-infective therapy.

MATERIALS AND METHODS

60 plasticized glycerol gelatin sponges containing either 10 or 20% gelatin (w/v) were incubated in vancomycin or teicoplanin solution at 20 degrees C for either 1 or 24 h. In vitro release properties of the sponges were investigated over a period of 1 week by determining the levels of vancomycin and teicoplanin eluted in plasma using fluorescent polarization immunoassay. The rate constant and the half-life for the antibiotic release of each group were calculated by linear regression assuming first order kinetics.

RESULTS

Presoaking for 24 h was associated with a significant increase in the total antibiotic release in all groups opposed to 1 h of incubation, except for the 10% sponges presoaked in teicoplanin. Doubling the gelatin content of the sponges from 10 to 20% significantly increased the total release of antibiotic load only in teicoplanin-containing sponges after 24 h incubation. In all corresponding groups investigated, release of vancomycin was more prolonged compared to teicoplanin, which allowed a gradual release beyond 5 days. The half-life (h +/- SEM) of both types of vancomycin-containing sponges was significantly prolonged by 24 h incubation in comparison to 1 h incubation (29.1 +/- 5.9 vs 5.9 +/- 1.0; p < 0.001, 30.0 +/- 2.1 vs 11.1 +/- 1.9; p < 0.001). However, neither doubling the gelatin content of the sponges nor a prolonged incubation was associated with a significantly prolonged delivery of teicoplanin.

CONCLUSION

This study demonstrated a better diffusion-controlled release of vancomycin-impregnated glycerol gelatin sponges compared to those pretreated with teicoplanin. The plasticized glycerol gelatin sponge may be a promising carrier for the application of vancomycin to infected wounds for local anti-infective therapy.

[Antimycotic drugs under continuous renal replacement therapy]

In critically ill patients with acute renal failure and continuous renal replacement therapy (CRRT), the elimination of antimycotic agents is influenced by many factors; these include not only the nature and dose of the renal replacement therapy but also the properties of the medicine. High protein binding, a high molecular weight and little or no renal elimination even in subjects with normal renal function suggest that a substance is not eliminated by CRRT. This is the case with amphotericin B, caspofungin, itraconazole and voriconazole, but not with fluconazole. In the case of fluconazole, an increase in dose than that used in patients with normal renal function may be required according to the nature and dose of CRRT, because the clearance of fluconazole can be substantially higher under CRRT than in subjects with normal renal function. Daily doses of 800 mg or more may be necessary. As a result of the diverse influences on elimination in patients receiving CRRT, the determination of fluconazole through concentrations cannot be dispensed with, in order to avoid underdosing and a failure of the antimycotic therapy.

[Recurrent Candida sepsis with prolonged respiratory failure and severe liver dysfunction]

Systemic mycoses, especially pulmonary diseases and septicemia are observed increasingly at intensive care units. Essential risk factors for development of candidosis are the expanded use of antibiotics and immunocompromised patients, caused either as a result of a severe underlying disease or iatrogenically induced after organ transplantation. Candida albicans is the most frequent pathogen in microbiological findings. Blood cultures are only positive in massive fungemia. We report a 50-year-old patient with recurrent Candida-septicemia: rupture of the distal esophagus after dilatation because of cardiac achalasia with mediastinal emphysema and mediastinitis. Severe acute respiratory distress syndrome after aspiration with septic shock and acute renal failure at the beginning. Long-term mechanical ventilation, continuous renal replacement therapy and multifarious antibiotic therapy. Early microbiological samples of several positive blood cultures and bronchoalveolar lavages revealed the presence of Candida albicans. In the further clinical course, detection of Pseudomonas species in bronchoalveolar lavages and Staphylococci as well as Enterococci in a number of positive blood cultures. Later on development of a severe liver dysfunction with test results that showed an intrahepatic cholestasis. Because of coagulation failure commencement of artificial liver support with the MARS-system (molecule adsorbent recirculating system). Decrease of high bilirubin levels was accompanied by improvement of clinical condition of the patient. In the following course, repeated severe systemic infections with phases of septicemia or rather septic shock and detection of Candida in several positive blood cultures and bronchoalveolar lavages. In each case increasing bilirubin levels with signs of intrahepatic cholestasis and each time improvement with antimycotic therapy (voriconazol, caspofungin and fluconazol). The patient showed more and more signs of immunodeficiency in the sequel. The clinical appearance of candidosis is manifold. Systemic Candida infections are frequent in patients with immunodeficiency. A recurrent Candida septicemia with prolonged respiratory failure and severe liver dysfunction in form of cholestatic hepatosis, that improved several times with antimycotic therapy in combination with evidence based intensive care measures and artificial organ support is a comparatively rare event.

[Pulmonary zygomycosis--a rare angioinvasive fungal infection]

Zygomycosis caused by Rhizopus species is an aggressive and rapidly progressive opportunistic fungal infection in immunocompromised patients. It comprises mucocutaneous, rhinocerebral, pulmonary, urological and disseminated infections. Predisposing factors are immunosuppression owing to severe diseases, immunological defects or metabolic disturbances like diabetic ketoacidosis. Rhizopus infections are characterized by angioinvasive growth, necroses of infected tissue and perineural invasion. The histopathologic demonstrable invasion of blood vessels is remarkable for a fungal infection. The mortality of zygomycosis is very high, especially for disseminated disease and when immunosuppression cannot be corrected. We report about two cases of pulmonary zygomycosis, caused by Rhizopus spp.: patient 1, female 73 years old: Delayed clinical course according to hip arthroplasty infection and infection of a femoropopliteal bypass of the right leg, eventually exarticulation of the right hip joint, Pseudomonas pneumonia, severe sepsis caused by staphylococci, acute respiratory distress syndrome (ARDs), acute renal failure and multiple use of antibiotics. Subsequently detection of Rhizopus spp. in the bronchoalveolar lavage and treatment with amphotericin B for this reason. Patient 2, male 68 years old: transplantation of kidney in past medical history, presenting with acute renal failure and with quite a few infections before. In the sequel development of abscessing pneumonia on the right side with a pleural empyema. Rhizopus spp. were detected by microbiological testing in the empyema fluid. These findings required surgical intervention, resection of the lower lobe of the right lung and within the same operation of the renal graft because of rejection. The patient was treated with caspofungin. The further course was delayed by several septic phases. Both patients died later on in spite of all efforts. The very rarely seen pulmonary zygomycosis caused by infection with Rhizopus spp. developed in both patients owing to immunosuppression, in one patient iatrogenically induced by immunosuppressive drugs after organ transplantation, in the other as a result of prolonged severe sepsis. In comparison with other mycoses treatment of Rhizopus infections remains difficult. The affinity to blood vessels, where the fungi multiply, and their feature of vascular invasion with thrombosis and infarction complicate therapeutic efforts.

Pharmacokinetics of levofloxacin during continuous venovenous hemodiafiltration and continuous venovenous hemofiltration in critically ill patients

STUDY OBJECTIVE

To assess the pharmacokinetics of levofloxacin during continuous venovenous hemodiafiltration (CVVHDF) and continuous venovenous hemofiltration (CVVH).

DESIGN

Nonrandomized pharmacokinetic evaluation.

SETTING

University surgical intensive care unit.

PATIENTS

Six critically ill patients.

INTERVENTION

Five patients received levofloxacin 500 mg/day and one patient received levofloxacin 125 mg/day All patients received continuous renal replacement therapy: CVVHDF on day 1 and CVVH on day 2, using an acrylonitrile hollow-fiber 0.9-m2 filter, constant blood flow rate of 90 ml/minute, substitution flow rate of 1 L/hour predilution, and dialysate flow rate of 1 L/hour (CVVHDF).

MEASUREMENTS AND MAIN RESULTS

Serum, ultrafiltrate, and dialysate concentrations of levofloxacin were determined by high-performance liquid chromatography. Extracorporeal clearance was 26.05 +/- 4.66 ml/hour during CVVHDF and 15.71 +/- 2.73 ml/hour during CVVH (p<0.05). Elimination half-life was 28.08 +/- 4.5 hours and 45.9 +/- 17.7 hours, and distribution volume was 1.51 +/- 0.52 L/kg and 1.42 +/- 0.42 L/kg for CVVHDF and CVVH, respectively. Saturation was 0.76 +/- 0.13 for CVVHDF versus a sieving coefficient of 0.77 +/- 0.16 for CVVH.

CONCLUSION

Marked extracorporeal elimination of levofloxacin occurs, requiring a dosage adjustment that can be calculated from the characteristics of CVVH and CVVHDF.

[Invasive aspergillosis on a surgical intensive care unit]

From 1-1-1995 until 1-3-2000 4777 patients were treated in a surgical intensive care unit. 12 patients (10 male/2 female, mean age 58 years) suffered from invasive aspergillosis. One patient had a purulent descending mediastinitis with evidence of Aspergillus fumigatus in the mediastinum and in both pleural cavities. One patient got a right upper lobectomie in cause of an aspergilloma. In 10 patients a broncho-alveolar aspergillosis was proved by at least two cultures from broncho-alveolar lavage (BAL) and biopsies. All our patients had a mean of 12.8 risk factors for systemic mycoses. The patients suffered from following underlying diseases: 3 x carcinoma of the esophagus (chemotherapy + radiation), 2 x ulcerative colitis, 1 x rupture of the aorta with insufficiency of the liver, 1 x acute leucosis and 1 x purulent mediastinitis. The therapy was based on infusion with amphotericin B up to 1.5 mg/kg/day in combination with flucytosine or itraconazole. In 4 patients inhalation of amphotericin B aerosol was applied. After therapeutic failure of amphotericin B-therapy 3 patients got voriconazole according to a study protocol. 10 patients died, 7 of them from their underlying disease.

Alternative shift models and the quality of patient care

On 1 January 1996, the German Arbeitszeitgesetz (working-time regulation) came into effect for hospital physicians. It states that working hours must not exceed 8 h per day, even for physician in hospitals. As a consequence, the prevalent two-shift model is legally inadmissible. The intention of this law is to protect the physician and to create better conditions for the patients. However, a systematic evaluation of the postulated benefits is still lacking.

AIM

The aim of our study was to analyze the influence of the length of daily working hours on the quality of patient care by measuring the outcome of patients in intensive care units (ICUs), comparing the two-shift model (2-SM)--two 12-h shifts--with the three-shift model (3-SM)--three 8-h shifts.

MATERIALS AND METHODS

In a prospective multicenter study, we compared the outcome of patients in six ICUs (organized by surgeons) with different models of working hours. The health status of each patient and the course on ICU [described by hospital mortality, number of complications, readmission to the ICU, reinterventions, duration of the stay in an ICU and hospital, the course of the Acute Physiology and Chronic Health Evaluation (APACHE) II score] were uni- and multivariately analyzed. In addition, the technical and personnel resources of the ICUs and the hospitals were documented.

RESULTS

Three hundred and forty seven patients (103 2-SM, 244 3-SM) were included. The epidemiological and the health status on admission to the ICU were comparable. Patients in the 3-SM stayed 1.6 days longer on ICU and 2.3 days longer in the hospital than the 2-SM patients. The frequency of complications, reinterventions, and readmissions to ICU was higher in the 3-SM. The median of the APACHE-II score decreased more for 2-SM than for 3-SM patients. This means a significantly quicker recovery of the patients in 2-SM (P < 0.05). The multivariate analysis with individual outcome measures as dependent variables revealed a significant positive effect of the 2-SM on the physicians' assessment of postoperative course, on the relative frequency of therapeutic procedures, and to a lesser extent on the duration of stay in the ICU.

Fiberoptic bronchoscopy of intubated patients with life-threatening hemoptysis

Bleeding in the tracheobronchial tree in intubated patients on an intensive care unit is a potentially life-threatening incident. The antecedent state of disease and frequent respiratory failure require immediate and effective therapeutic measures to avoid further respiratory and cardiocirculatory depression. We present our bronchoscopic management of endobronchial bleeding. Cardiorespiratory function must be maintained by modification of the mechanical ventilation and drug therapy owing to the patient's condition. Seven consecutive patients with acute endobronchial bleeding were treated with fiberoptic bronchoscopy and instillation of cold epinephrine-saline solution (1:10,000-100,000) during the period of July 1997 to December 1997. Control of bleeding was achieved after 1 to 20 (mean +/- SEM: 5.86 +/- 0.93) bronchoscopic interventions during a period of 0.5 hours to 10 days. One control bronchoscopy was performed additionally in every patient. Cardiocirculatory instability was observed in five patients. Six patients survived; one patient died of uncontrolled bleeding caused by severe pulmonary aspergillosis. Fiberoptic endobronchial epinephrine instillation is an effective therapy for life-threatening hemoptysis in critically ill patients. Widespread use of flexible bronchoscopy makes this procedure immediately applicable in critical situations. Intubated and mechanically ventilated patients with life-threatening hemoptysis especially benefit from this rapidly feasible procedure.

Influence of continuous veno-venous haemodiafiltration and continuous veno-venous haemofiltration on the pharmacokinetics of fluconazole

OBJECTIVE

To compare the elimination of fluconazole by continuous veno-venous haemodiafiltration (CVVHD) and continuous veno-venous haemofiltration (CVVH) at different dosages.

INTERVENTION

Patients received doses of 400 mg (n=3), 600 mg (n=1) or 800 mg (n=2) fluconazole as a short-time infusion once a day. Patients underwent CVVHD the first day and CVVH the second day. CVVHD and CVVH were performed using an acrylonitrile hollow-fibre filter at a constant blood flow of 90 ml/min and a substitution flow of 1000 ml/h (predilution). During CVVHD, the dialysate flow was 1000 ml/h. Ultrafiltration rates were 1158+/-90.5 ml/h during CVVHD and 1167+/-81.6 ml/h. Serum and ultrafiltrate/dialysate concentrations of fluconazole were determined on nine occasions over 24 h.

PARTICIPANTS

Six critically ill patients with acute renal failure (ARF) and serious fungal infection.

RESULTS

Extracorporeal clearance (CVVHD 30.5+/-6.0 ml/min, CVVH 17.5+/-4.0 ml/min) and total clearance of fluconazole (CVVHD 37.9+/-4.4 ml/min, CVVH 25.3+/-6.5 ml/min) were significantly higher during CVVHD (P < 0.05). During CVVHD, the sieving coefficient (S(CVVHD)) was 0.88 (range 0.54-1) and the elimination half-life (t1/2) was 14.8-35.1 h. During CVVH, the S(CVVH) was 0.96 (range 0.56-1.02) and t1/2 was 24.0-51.6 h.

CONCLUSIONS

A daily dosage of 400-800 mg fluconazole is recommended in the treatment of life-threatening fungal infections in critically ill patients undergoing CVVHD since the clearance of CVVHD may considerably exceed the clearance in patients with normal renal function, which is about 20 ml/min. Drug monitoring is highly recommended for these patients.

[Women physicians in a surgical university clinic 1980 to 1996]

From 1980 to 1996 214 male and 51 female physicians were employed at the Department of Surgery of the University Hospital of Lübeck (Germany). The percentage of female surgeons increased from 13% in 1980 to 20% in 1996. Nowerdays female surgeons more often succeed in becoming a specialist, a ward physician or senior physician. Female physicians often quit their job in surgery because of reasons in their family background (child care, change of place of their husband's job).

[Electronic data processing of patient performance assessment and nursing care documentation on the surgical intensive care unit]

A software was created that picks up the attainments and procedures of a surgical intensive care unit on a computer to control and handle the processes and operations. After the data have been obtained, they are used for science and for the controlling department to establish what costs are incurred for a patient.

[Blunt thoracic trauma--therapeutic relevance of results of roentgen image, ultrasound and computerized tomography]

In 60 patients with severe thoracic trauma the diagnostic procedures--X-ray of the chest, sonography and thoracic computed tomography (CT)--were reviewed for their incidence of finding all injuries. X-ray of the chest often failed to detect lung contusion and injuries in the mediastinal space. Four of five ruptures of the diaphragm were incidental findings on the occasion of laparotomy because of intraabdominal bleeding.

High incidence of active cytomegalovirus infection among septic patients

Cytomegalovirus (CMV) infection is an important cause of disease in immunocompromised patients. In a prospective longitudinal study of 34 septic patients, the incidence of active CMV infection was examined. Eleven of 34 patients (32.4%) had active CMV infection, diagnosed by immunocytochemical staining of CMV pp65 antigen in blood leukocytes and/or detection of CMV DNA by PCR. Positive results for CMV infection were obtained in a median of 4 days (by PCR) or 11 days (by staining of pp65 antigen) after onset of sepsis. Twenty patients for whom more than one sample was examined were selected for further analysis. Among the patients with active CMV infection (nine of 20) there was a trend toward higher median values of tumor necrosis factor alpha, interleukin-1 beta, alanine aminotransferase, and aspartate aminotransferase in plasma, in comparison with the values for patients without CMV infection. Sepsis in patients with CMV infection may affect outcome of the disease.