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Andreas Perren


andreas.perren@eoc.ch

Journal articles

2009
A Perren, M Previsdomini, B Cerutti, D Soldini, D Donghi, C Marone (2009)  Omitted and unjustified medications in the discharge summary.   Qual Saf Health Care 18: 3. 205-208 Jun  
Abstract: BACKGROUND: Limited information exists in regard to drug omissions and unjustified medications in the hospital discharge summary (DS). OBJECTIVE: To evaluate the incidence and types of drug omissions and unjustified medications in the DS, and to assess their potential impact on patient health. METHODS: A prospective observational review of the DSs of all patients discharged from our Internal Medicine Department over a 3-month period. Data assessment was made by internists using a structured form. RESULTS: Of the 577 evaluated DSs, 66% contained at least one inconsistency accounting for a total of 1012 irregularities. There were 393 drug omissions affecting 251 patients, 32% of which were potentially harmful. Seventeen per cent of all medications (619/3691) were unjustified, affecting 318 patients. The unjustified medication was potentially harmful in 16% of cases, occurred significantly more frequent in women than in men (61% vs 50%; p = 0.008) and increased linearly with the number of drugs prescribed (p<0.001). Drug omission had a twofold higher potential to cause harm than unjustified medication. CONCLUSIONS: Drug omissions and unjustified medications are frequent, and systemic changes are required to substantially reduce these inconsistencies.
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A Perren, D Donghi, C Marone, B Cerutti (2009)  Economic burden of unjustified medications at hospital discharge.   Swiss Med Wkly 139: 29-30. 430-435 Jul  
Abstract: QUESTION UNDER STUDY: Medication errors are a major concern for health care since they may cause or lead to inappropriate medication use or patient harm. However, little is known regarding the economic burden of unjustified medications. METHODS: Hospital discharge records of 577 patients were prospectively screened for the presence of unjustified medications. From this sample population, 318 (55%) were eligible and their data were used to assess the monthly costs of unjustified discharge medications, their relationship to the total and each individual's drug expenditure, and the relative cost weights of relevant unjustified drug classes. RESULTS: The results found that 619 out of 3691 prescriptions (16.8%) were unjustified. The mean (median; 95% CI) monthly costs of unjustified discharge medications were 32 euro (27 euro; 29 euro to 35 euro). The percentage of unnecessary treatments was inversely linked to the amount of total individual drug expenditure. For this collective, monthly extra costs due to unjustified medications were 18585 euro, and the relative cost weights of the relevant drug classes were 45.8% for gastrointestinal agents (33.8% for proton pump inhibitors), 17.7% for cardiovascular drugs, and 17.2% for psychiatric drugs. CONCLUSIONS: There is a considerable financial burden imposed by unjustified medications at hospital discharge. Discharge medications not motivated by appropriate diagnoses should be questioned. This study should be repeated in other institutions and in a larger population.
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Andreas Perren, Bernard Cerutti, Mario Lazzaro, Davide Donghi, Marco Previsdomini, Claudio Marone (2009)  Comparison of in-hospital secondary prevention for different vascular diseases.   Eur J Intern Med 20: 6. 631-635 Oct  
Abstract: BACKGROUND: Secondary prevention of coronary artery disease is highly effective and implemented on a large scale. However, studies testing adherence to recommended secondary prevention of other vascular diseases are rare. Our goal was to evaluate whether the kind of vascular disease influences prescription practice of secondary drug prophylaxis at hospital discharge and to which extent secondary prevention is actually complete. METHODS: A 3-month prospective observational review of the hospital discharge information of all patients hospitalized because of a vascular disease diagnosis: coronary artery disease (i.e. acute myocardial infarction [AMI] and chronic stable angina [CSA]); peripheral artery disease [PAD] and cerebrovascular disease [CVD]. The analysis was done by board registered internists with a structured form that founded on internationally accepted recommendations. RESULTS: From 271 patients 191 had coronary artery disease (105 AMI and 86 CSA), 88 PAD and 72 CVD. Global prescription rate (mean; 95% CI) of indicated secondary prophylaxis drugs was 74.1% (69.9-78.2) for AMI, 72.4% (67.2-77.5) for CSA, 74.7% (68.8-80.7) for PAD and 72.1% (66.9-77.3) for CVD. The proportion of patients who were prescribed a complete bundle of recommended medications was globally 29.5% (24.1-35.0). CONCLUSIONS: We found similar global prescription rates of secondary prevention for the different vascular diseases. However, only one third of the studied collective gets a complete set of required prophylactic drugs.
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2008
A Perren, B Cerutti, M Lepori, V Senn, B Capelli, F Duchini, G Domenighetti (2008)  Influence of steroids on procalcitonin and C-reactive protein in patients with COPD and community-acquired pneumonia.   Infection 36: 2. 163-166 Mar  
Abstract: BACKGROUND: The induction of C-reactive Protein (CRP) may be attenuated by corticosteroids, whereas Procalcitonin (PCT) appears to be unaltered. We investigated, whether in community-acquired pneumonia (CAP) a combined antibiotic-corticosteroid therapy may actually lead to different slopes of decline of these inflammatory markers. PATIENTS AND METHODS: We studied the slopes of decline of PCT and CRP serum levels during 7 consecutive days as well as clinical parameters in a group of patients with CAP on or off corticosteroids. Patients with underlying COPD received systemic corticosteroids (n = 10), while non-COPD patients (n = 10) presenting with CAP alone formed the control group. All patients were treated with antibiotics. RESULTS: At baseline, relevant clinical and laboratory characteristics of the two groups were similar. Regarding the decreasing shapes of the curves from PCT and CRP, no significant differences were found (p-value = 0.48 for the groups for CRP, respectively 0.64 for PCT). All patients showed an uneventful recovery. CONCLUSION: In patients with COPD and CAP, the time courses over 7 days of PCT and CRP showed a nearly parallel decline compared to non-COPD patients with CAP. Contrary to the induction phase, corticosteroids do not modify the time-dependent decay of PCT and CRP when the underlying infectious disease (CAP) is adequately treated.
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Andreas Perren, Patrik Conte, Nunzio De Bitonti, Costanzo Limoni, Paolo Merlani (2008)  From the ICU to the ward: cross-checking of the physician's transfer report by intensive care nurses.   Intensive Care Med 34: 11. 2054-2061 Nov  
Abstract: OBJECTIVE: To assess whether cross-checking of the physician ICU transfer report by ICU nurses may reduce transfer report errors. DESIGN: Prospective, observational study with random selection (according to patient registration code) of ICU transfer reports. SETTING: Eight-bed multidisciplinary intensive care unit of a teaching hospital. PATIENTS AND PARTICIPANTS: ICU transfer reports of 123 patients were randomly selected at discharge from the ICU between November 2006 and February 2007. INTERVENTIONS: Physician ICU transfer reports were cross-checked by nurses using defined review criteria. Inter-rater agreement (between nurses and the head of ICU) was assessed by kappa-values, and was excellent overall (0.9). All intercepted errors (100%) were consequently corrected by the interns. MEASUREMENTS AND RESULTS: Out of 123 transfer reports, 76 (62%) were affected by at least one error. Among 305 intercepted errors, 247 were prescription errors (26% of all prescriptions), 45 involved proposed procedures, and 13 were deficient in updating diagnoses. Most of the errors (248/305, 81%) were classified as simple, 43 (14%) as serious, or 14 (5%) as critical. Thirty-five (28%) transfer reports were considered potentially harmful (i.e., affected by at least one critical/serious error). In a multivariate model, only the number of medications included in the transfer report was associated with the occurrence of at least one critical/serious error. CONCLUSIONS: Errors in ICU transfer reports are frequent and may be potentially harmful. ICU nurses may help to effectively and accurately intercept those inaccuracies, and therefore reduce the exportation of errors from the ICU to the ward.
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2007
Marco Previsdomini, Reto Stocker, Roberto Corti, Bernard Cerutti, Andreas Perren (2007)  Time course of hemoglobin concentrations in the intensive care unit in nonbleeding patients with acute coronary syndrome.   Am J Cardiol 100: 4. 579-582 Aug  
Abstract: Critically ill patients commonly show a decrease in hemoglobin concentration during their stay in the intensive care unit. The purpose of the present study was to evaluate whether nonbleeding patients with acute coronary syndrome (ACS) show a similar decrease of hemoglobin, and thereby furnish reference values and analyze possible mechanisms. In this retrospective, descriptive study, the charts of all patients with ACS hospitalized between January 2004 and September 2005 were screened with regard to patient characteristics, time course of hemoglobin, as well as clinical parameters, concomitant drug therapy, and fluid balances. One hundred three nonbleeding patients with ACS were analyzed. They showed an average hemoglobin decrease of 1.27 +/- 1.00 g/dl (p <0.001). The decrease in hemoglobin level was observed during the first 12 to 24 hours; thereafter the hemoglobin concentration remained stable. We found a correlation among decrease of hemoglobin, parameters of stress, such as hypertension (p = 0.019), tachycardia (p = 0.004), pain (p = 0.043), and white blood cells (p = 0.021), as well as the intravenous administration of nitroglycerin (p = 0.004). In conclusion, during the first 24 hours in the intensive care unit the hemoglobin concentration of nonbleeding patients with ACS regularly decreases at 1.27 +/- 1.00 g/dl. Any further decrease in hemoglobin level beyond these values should entail early active search of the bleeding source. We hypothesize that this decrease is due to normalization of the previous stress-induced hemoconcentration and "internal hemodilution" by nitroglycerin.
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A Perren, G Merlani, M Previsdomini, R Stocker (2007)  Non infectious postoperative fever   Praxis (Bern 1994) 96: 13. 495-498 Mar  
Abstract: We present the case of a 74-years old man with subtotal gastrectomy for adenocarcinoma, whose postoperative course is complicated by a prolonged fever. Despite extensive diagnostics, the origin of the postoperative fever remains unexplained for 47 days, when the patient is transferred to the ICU because of lethargy, hemodynamic instability, lung edema and abdominal symptoms. The diagnosis of Addison crisis is established and under substitution with hydrocortisone all the symptoms rapidly resolve. Postoperative fever is relatively frequent and infectious causes account for about half of the cases only. An infectious origin has imperatively to be excluded when the fever arises later than 48 hrs after surgery. In case of prolonged fever we suggest to extend the differential diagnosis to other than infectious causes by means of special lists (e.g fever of unknown origin).
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Valerio Saglini, Mario Lazzaro, Franco Keller, Andreas Perren (2007)  Detection of hereditary hemochromatosis   Rev Med Suisse 3: 123. 1952-1957 Sep  
Abstract: Hereditary hemochromatosis is one of the most common genetic disorders. The prognosis of hemochromatosis is normal when phlebotomy therapy is started prior to manifestation of cirrhosis or diabetes. High ferritin is not always a marker of iron overload and ferritin must thus be coupled with transferrin saturation. Only high transferrin saturation entails a genetic research (HFE or type 1). The identification of rare types of hemochromatosis (types 2-4) is only required in particular cases. The evaluation of the iron overload is now based on hepatic MRI determination rather than liver biopsy.
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2005
Andreas Perren, Claudio Marone (2005)  Remember 'a posteriori diagnosis' of carbon monoxide poisoning.   Eur J Emerg Med 12: 5. 259-260 Oct  
Abstract: OBJECTIVES: To raise awareness of the possibility of carbon monoxide poisoning as a diagnosis in the emergency department and to present the little known fact that it is possible to diagnose carbon monoxide poisoning retrospectively. METHOD: Presentation of a case report, review of the literature. RESULTS: Persistence of elevated carboxyhaemoglobin levels in a stored vacutainer blood sample. CONCLUSION: Carbon monoxide poisoning is common but often goes unrecognized. This method may help to decrease the number of overlooked cases and thereby possibly prevent further exposure and acute or chronic sequelae.
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2004
2002
Andreas Perren, Guido Domenighetti, Simonetta Mauri, Franco Genini, Nicoletta Vizzardi (2002)  Protocol-directed weaning from mechanical ventilation: clinical outcome in patients randomized for a 30-min or 120-min trial with pressure support ventilation.   Intensive Care Med 28: 8. 1058-1063 Aug  
Abstract: OBJECTIVE: To investigate the possibility of successful extubation performing a spontaneous breathing trial (SBT) in pressure support ventilation (PSV) with target durations of 30 and 120 min. DESIGN AND SETTING: Prospective and randomized study in two medical-surgical adult intensive care units. PATIENTS AND PARTICIPANTS: 98 adult patients supported by mechanical ventilation for at least 48 h and considered ready for a weaning trial. INTERVENTIONS: An SBT conducted in PSV with 7 cmH(2)O and patients randomly assigned to two groups with target durations of 30- and 120-min. MEASUREMENTS AND RESULTS: In the 30-min group 43 patients (93%) tolerated the SBT and were extubated while 4 (9%) needed reintubation within 48 h; in the 120-min group 46 patients (88%) successfully completed the trial and were extubated while 2 (4%) were reintubated. ICU mortality in the groups with short and long periods was 6% and 4%, and in-hospital mortality 20% and 17%, respectively. Those successful in the 30- and 120-min groups had similar length of ICU stay (6 and 7 days, respectively) and in-hospital length of stay (20 and 25 days, respectively). Compared to the successfully extubated, the reintubated patients had significantly higher length of ICU stay and mortality (17 vs. 6 days and 33 vs. 3.6%, respectively). CONCLUSIONS: An SBT with PSV of 7 cmH(2)O lasting 30 min is equally effective in recognizing the successfully extubated patients as a 120-min trial.
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1999
V Lepori, A Perren, C Marone (1999)  Adverse internal medicine drug effects at hospital admission   Schweiz Med Wochenschr 129: 24. 915-922 Jun  
Abstract: Hospital admissions due to adverse drug reactions are an important concern, but there are few data concerning the specific situation in Switzerland. During one year we therefore prospectively studied all admissions to our medical department to determine the profile. 138 of 2168 patients presented a total of 150 adverse drug reactions at hospitalisation (6.4%) and among them 65% of the admissions were directly related to adverse drug reaction. Age stratification revealed that with each decade of age there was an increasing risk of adverse drug reactions and that the patients were sicker (more diagnoses), were consuming more drugs and had longer stays. The majority of adverse drug reactions were type A reactions and therefore potentially preventable. Cardio- and cerebrovascular drugs (diuretics, ACE-inhibitors, platelet aggregation inhibiting therapy) accounted for 65% of the side effects. Analysed by affected organ system, the most frequent adverse drug reactions were gastrointestinal complications followed by dehydration (contracted extracellular fluid volume) and hypo-/hyperkalaemia. Non-compliance by the patients was less frequently at the origin of the admission than iatrogenic causes related to physician errors. The patients generally did not know the reasons, details and side effects of their medical treatment. Based on our data, we estimate that the national number of drug-related hospital admissions caused by inappropriate or unnecessary treatment is 12,000-16,000, with direct annual extra costs of 70-100 million Swiss francs. Adverse drug reactions therefore represent a serious medical and financial problem. Specialised computing systems designed to reduce these events should be introduced in hospitals and ambulatory care.
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1998
A Perren, F Beretta, P Schubarth (1998)  ARDS in plasmodium vivax malaria   Schweiz Med Wochenschr 128: 25. 1020-1023 Jun  
Abstract: Acute renal failure, disseminated intravascular coagulation, ARDS, hypoglycaemia, coma or epileptic seizures are manifestations of severe Plasmodium falciparum malaria. On the other hand, vivax malaria or benign tertian malaria is usually free from complications. In the present report we describe a case of acute tertian malaria with a severe and complicated course. In this situation bacterial coinfection should always be suspected and treated empirically with broad-spectrum antibiotics, until the results of cultures are available. Mixed plasmodial infection (P. vivax and P. falciparum) must be excluded by repeated and meticulous examination of blood smears. Newer techniques such as PCR processing or ParaSight F Test are mentioned.
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