Bayesian networks to identify potential high-risk multimorbidity and intervention clusters in inpatients: an explorative data mining study.

AIMS OF THE STUDY: Based on large sets of routine hospital data from inpatient cases, we aimed to explore multimorbidity and intervention clusters showing high risks for in-hospital mortality and unplanned readmissions using data-driven analytical methods. METHODS: We performed an explorative, historical cohort study of consecutive inpatient cases at a tertiary care centre with an integrated platform for routine healthcare data in Switzerland. From January 2012 through to December 2017, all inpatients aged ≥18 years at hospital admission were eligible for study inclusion. We predefined all-cause in-hospital death and unplanned hospital readmission as co-primary outcomes. In a first step, we explored and visualised multimorbidity and intervention clusters using mutual information analysis. In a subsequent step, we trained multi-layer Bayesian networks to identify clusters associated with in-hospital death and/or unplanned hospital readmission. RESULTS: Among 190,837 inpatient cases, 7994 unique diagnoses and 6639 interventions were routinely recorded during the six-year study period. Based on the mutual information analysis, we identified 32 multimorbidity clusters and 24 intervention clusters – of which several were directly related to in-hospital mortality and/or unplanned readmission in the subsequent Bayesian network analysis. CONCLUSIONS: Bayesian network analysis may be used as a tool to mine large healthcare databases in order to explore intervention targets for quality improvement programmes. However, the resulting associations should be substantiated in consecutive investigations using specific causal models. (Trial registration no EKNZ 2016-02128.).

Medical diagnoses showed low relatedness in an explorative mutual information analysis of 190,837 inpatient cases.

OBJECTIVES: We aimed to quantify the shared information between medical diagnoses of an adult inpatient population to explore both multimorbidity patterns and vice versa the unrelatedness of medical diagnoses. STUDY DESIGN AND SETTING: This was a cross-sectional study, performed at a tertiary care center in Switzerland. Diagnoses were routinely coded using the International Classification of Diseases, 10th revision. RESULTS: Among 190,837 inpatient cases, 7,994 unique diagnoses were coded. There were 31.9 million possible diagnosis pairs; the respective mutual information scores in diagnosis pairs were low (range, 10-7 to 0.237). There were 148 pairs of diagnoses with a mutual information score higher than 0.01, which formed several clinically plausible disease clusters; 27.2% of cases did not have a diagnosis that belonged to one of the morbidity clusters. CONCLUSION: In an explorative analysis, we observed a high unrelatedness of diagnoses in a tertiary-care inpatient population. This finding indicates that although multimorbidity patterns can be observed, inpatient cases frequently have further, unrelated diagnoses, which share little information with specific other diagnoses. Therefore, management of multimorbid patients should be individualized and may not be generalized based on a few multimorbidity patterns or clusters.

Secondary use of routine data in hospitals: description of a scalable analytical platform based on a business intelligence system.

We describe a scalable platform for research-oriented analyses of routine data in hospitals, which evolved from a state-of-the-art business intelligence architecture for enterprise resource planning. This platform involves an in-memory database management system for data modeling and analytics and a high-performance cluster for more computing-intensive analytical tasks. Setting up platforms for research-oriented analyses is a highly dynamic, time-consuming, and costly process. In some health care institutions, effective research platforms may be derived from existing business intelligence systems.

Current and Future Challenges in Point-of-Care Technologies: A Paradigm-Shift in Affordable Global Healthcare With Personalized and Preventive Medicine.

This paper summarizes the panel discussion at the IEEE Engineering in Medicine and Biology Point-of-Care Healthcare Technology Conference (POCHT 2013) held in Bangalore India from Jan 16-18, 2013. Modern medicine has witnessed interdisciplinary technology innovations in healthcare with a continuous growth in life expectancy across the globe. However, there is also a growing global concern on the affordability of rapidly rising healthcare costs. To provide quality healthcare at reasonable costs, there has to be a convergence of preventive, personalized, and precision medicine with the help of technology innovations across the entire spectrum of point-of-care (POC) to critical care at hospitals. The first IEEE EMBS Special Topic POCHT conference held in Bangalore, India provided an international forum with clinicians, healthcare providers, industry experts, innovators, researchers, and students to define clinical needs and technology solutions toward commercialization and translation to clinical applications across different environments and infrastructures. This paper presents a summary of discussions that took place during the keynote presentations, panel discussions, and breakout sessions on needs, challenges, and technology innovations in POC technologies toward improving global healthcare. Also presented is an overview of challenges and trends in developing and developed economies with respect to priority clinical needs, technology innovations in medical devices, translational engineering, information and communication technologies, infrastructure support, and patient and clinician acceptance of POC healthcare technologies.

Head-to-head comparison of length of stay, patients' outcome and satisfaction in Switzerland before and after SwissDRG-Implementation in 2012 in 2012: an observational study in two tertiary university centers.

BACKGROUND: On 1 January 2012 Swiss Diagnosis Related Groups (DRG), a new uniform payment system for in-patients was introduced in Switzerland with the intention to replace a "cost-based" with a "case-based" reimbursement system to increase efficiency. With the introduction of the new payment system we aim to answer questions raised regarding length of stay as well as patients' outcome and satisfaction. METHODS: This is a prospective, two-centre observational cohort study with data from University Hospital Basel and the Cantonal Hospital Aarau, Switzerland, from January to June 2011 and 2012, respectively. Consecutive in-patients with the main diagnosis of either community-acquired pneumonia, exacerbation of COPD, acute heart failure or hip fracture were included. A questionnaire survey was sent out after discharge investigating changes before and after SwissDRG implementation. Our primary endpoint was LOS. RESULTS: Of 1,983 eligible patients 841 returned the questionnaire and were included into the analysis (429 in 2011, 412 in 2012). The median age was 76.7 years (50.8% male). Patients in the two years were well balanced in regard to main diagnoses and co-morbidities. Mean LOS in the overall patient population was 10.0 days and comparable between the 2011 cohort and the 2012 cohort (9.7 vs 10.3; p = 0.43). Overall satisfaction with care changed only slightly after introduction of SwissDRG and remained high (89.0% vs 87.8%; p = 0.429). DISCUSSION: Investigating the influence of the implementation of SwissDRG in 2012 regarding LOS patients' outcome and satisfaction, we found no significant changes. However, we observed some noteworthy trends, which should be monitored closely.

Head-to-head comparison of fee-for-service and diagnosis related groups in two tertiary referral hospitals in Switzerland: an observational study.

BACKGROUND: Reimbursement for inpatients in Switzerland differed among states until 2012. Some hospitals used diagnosis related groups (DRG) and others used fee-for-service (FFS). We compared length of hospital stay (LOS), patient satisfaction and quality of life between the two systems before a nation-wide implementation of DRG. METHODS: In a prospective, two-centre observational cohort study, we identified all patients with a main diagnosis of either community-acquired pneumonia, exacerbation of chronic pulmonary obstructive disease, acute heart failure or hip fracture from January to June 2011 and performed a systematic questionnaire survey 2-4 months after hospital discharge. RESULTS: Of 1,093 inpatients, 450 were included. Mean age was 71.1 (±SD 19.5) years (48% male). Patients in the FFS hospital were older (mean age 74.8 vs. 65.2 years; p <0.001) and suffered from more co-morbidities. Mean LOS was 9 days and shorter in the all-patient DRG (AP-DRG) hospital (unadjusted mean 8.2 vs. 9.5 days, p = 0.04). After multivariate adjustment, no significant difference in LOS was found (p = 0.24). More patients from the FFS hospital were re-hospitalised for any reason (35% vs. 17.5%; p = 0.01), re-admitted to acute-care institutions (11.7% vs. 5.2%; p = 0.014), not satisfied with the discharge process (15.3% vs. 9.7%; p = 0.02), showed problems with self-care (93.8% vs. 88%; p = 0.03) and usual activities (79.3% vs. 76%; p = 0.02). DISCUSSION: This study suggested that the AP-DRG hospital showed higher patient satisfaction regarding discharge, lower re-hospitalisation rates and shorter LOS partly explained by a lower burden of co-morbidities and disease severity. This study needs validation in a larger cohort of patients and at multiple time points.

[Characteristics of patients suffering from chronic pain with depressive symptoms in three different treatment settings]. / Charakteristika chronischer Schmerzpatienten mit depressiver Begleitsymptomatik in drei unterschiedlichen Behandlungssettings.

BACKGROUND: Only few studies considered demographic and medical characteristics of pain patients with depressive symptoms. METHODS: The present study is a cross-sectional observation of 585 patients suffering from chronic pain and depressive symptoms from all over Switzerland who got an antidepressant treatment in 122 medical practices (internal medicine, general medicine, psychiatry). Based on their clinical experience within the Swiss mental health system, the authors hypothesized that internists and general practitioners, compared to psychiatrists, treat older and less depressive patients with less intense chronic pain and with regional origin from Central Europe. RESULTS: In accordance with this hypothesis, internists (and general practitioners), compared to psychiatrists, more frequently provided care for older patients from Central Europe with less severe depressive symptoms and lower pain intensity and less head pain. Furthermore, compared with Central European patients, those patients from Eastern and Southern Europe presented more intense overall pain mainly affecting the head, extremities, back, and thorax whereas Southern Europeans tended to suffer even more frequently from chest pain compared with their Central European peers. CONCLUSION: The study design pragmatically represents the caring situation for depressed patients with chronic pain in Switzerland regarding regional origin and pain intensity. The results are based on a respectable sample size recruited from all Swiss regions and by the physician specialities primarily involved in long-term management of this patient group.

Regional origin and decrease of pain in patients with depressive symptoms under treatment with venlafaxine.

OBJECTIVE: Patient's language, tradition, conventions, and customs may all determine integration into a society and are also part of the doctor-patient relationship that influences diagnostic and therapeutic outcome. Language barrier and sociocultural disparity of Eastern and Southern European patients may hamper recovery from pain and depression compared to Middle European patients in Switzerland. METHODS: In a prospective naturalistic observational trial we investigated the influence of regional origin on treatment outcome in 420 pain sufferers with depressive symptoms from all over Switzerland who were treated with venlafaxine by 122 physicians in primary care. Physicians rated severity of depressive symptoms using the clinical global impression severity scale and pain intensity by means of visual analogue scales. We hypothesized that in Eastern and Southern European patients the magnitude of pain reduction under treatment with venlafaxine is less compared to Middle European patients. RESULTS: Three months after study entry, Middle European patients were found to profit more from treatment with venlafaxine in terms of severity of depression and pain intensity than patients from Eastern Europe and Southern Europe. CONCLUSION: Regional origin may contribute to the magnitude of pain reduction in patients with depressive symptoms under treatment with venlafaxine. Our results provide a rational for care provider educational programs aimed at improving capacities in treating patients from different regional origin with psychosomatic complaints such as depression and comorbid pain.

Intramedullary nailing of clavicular midshaft fractures with the titanium elastic nail: problems and complications.

BACKGROUND: Intramedullary nailing of clavicular midshaft fractures using the titanium elastic nail has been described as a technically easy, minimally invasive operation with few complications and an early return to competitive sports. HYPOTHESIS: The results reported thus far have been positive. The titanium elastic nail is associated with multiple intraoperative and postoperative problems. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: From April 2004 to March 2007, 34 patients at our institution were treated with intramedullary nailing. A standard titanium elastic nail was used in 19 cases and a titanium elastic nail with an end cap in 15 cases. The titanium elastic nail was inserted and advanced under fluoroscopic control. A short incision at the fracture site was made for open reduction if needed. Postoperatively, free range of motion was allowed. RESULTS: In 62% of patients, open reduction was necessary independent of fracture type, flattening of the titanium elastic nail, or transverse fragments. Operating time was 44 minutes (range, 10-105 minutes) and fluoroscopy time 9 minutes (range, 2-25 minutes). In 70% of patients, problems or complications occurred (7 medial perforations, 7 lateral penetrations, 1 titanium elastic nail breakage, 1 titanium elastic nail dislocation, 7 hardware irritations). The reoperation rate was 36%. Medial migration and pain were significantly reduced by using an end cap. CONCLUSION: Intramedullary nailing of clavicular midshaft fractures using the titanium elastic nail is a technically demanding operation with various complications in the postoperative phase. This study might explain why the implant has not yet achieved widespread application, despite the fact that other authors have reported good results. Amending the operative technique and postoperative treatment might improve the outcome in the future.

Surgery for metastatic urothelial carcinoma with curative intent: the German experience (AUO AB 30/05).

BACKGROUND: Recent publications suggest a benefit from surgical removal of urothelial carcinoma metastases (UCM) for a subgroup of patients. OBJECTIVE: We report the combined experience and outcome of patients undergoing resection of UCM gained at 15 uro-oncologic centers in Germany. DESIGN, SETTING, AND PARTICIPANTS: Retrospective survey of 44 patients with distant UCM of the bladder or upper urinary tract who underwent complete resection of all detectable metastases in 15 different German uro-oncological centers between 1991 and 2008. INTERVENTION: Resected metastatic sites were the following: retroperitoneal lymph nodes (56.8%), distant lymph nodes (11.3%), lung (18.2%), bone (4.5%), adrenal gland (2.3%), brain (2.3%), small intestine (2.3%), and skin (2.3%). Systemic chemotherapy was administered in 35 of 44 patients (79.5%) before and/or after UCM surgery. MEASUREMENTS: Overall, cancer-specific and progression-free survival from time of diagnosis and metastasectomy of UCM. RESULTS AND LIMITATIONS: Median survival from initial diagnosis of UCM and subsequent resection was as follows: overall survival, 35 mo and 27 mo; cancer-specific survival, 38 mo and 34 mo; and progression-free survival, 19 mo and 15 mo. Overall 5-yr survival from metastasectomy for the entire cohort was 28%. Seventeen patients were still alive without progression at a median follow-up of 8 mo. Seven patients without disease progression survived for >2 yr and remained free from tumor progression at a median follow-up of 63 mo. No significant prognostic factors could be determined due to the limited patient number. CONCLUSIONS: Long-term cancer control and possible cure can be achieved in a subgroup of patients following surgical removal of UCM. Metastasectomy in patients with disseminated UCM remains investigational and should only be offered to those with limited disease as a combined-modality approach with systemic chemotherapy.

Change in pain severity with open label venlafaxine use in patients with a depressive symptomatology: an observational study in primary care.

PURPOSE: Venlafaxine has shown benefit in the treatment of depression and pain. Worldwide data are extensively lacking investigating the outcome of chronic pain patients with depressive symptoms treated by venlafaxine in the primary care setting. This observational study aimed to elucidate the efficacy of venlafaxine and its prescription by Swiss primary care physicians and psychiatrists in patients with chronic pain and depressive symptomatology. SUBJECTS AND METHODS: We studied 505 patients with depressive symptoms suffering from chronic pain in a prospective naturalistic Swiss community based observational trial with venlafaxine in primary care. These patients have been treated with venlafaxine by 122 physicians, namely psychiatrists, general practitioners, and internists. RESULTS: On average, patients were treated with 143+/-75 mg (0-450 mg) venlafaxine daily for a follow-up of three months. Venlafaxine proved to be beneficial in the treatment of both depressive symptoms and chronic pain. DISCUSSION: Although side effects were absent in most patients, physicians might have frequently omitted satisfactory response rate of depression by underdosing venlafaxine. Our results reflect the complexity in the treatment of chronic pain in patients with depressive symptoms in primary care. CONCLUSION: Further randomized dose-finding studies are needed to learn more about the appropriate dosage in treating depression and comorbid pain with venlafaxine.

Aortitis following percutaneous aortic side branch embolization prior to endovascular repair of infrarenal aortic aneurysm.

PURPOSE: To report two cases of life-threatening aortic infection after percutaneous endovascular coil embolization prior to endovascular abdominal aortic aneurysm (AAA) repair (EVAR). CASE REPORT: Two 76-year-old patients were readmitted 5 days and 3 weeks, respectively, after technically successful percutaneous coil embolization of aortic side branches in advance of scheduled EVAR. In the first patient, the right hypogastric artery, the inferior mesenteric artery (IMA), and a lumbar artery had been embolized, whereas in the second patient only the right hypogastric artery and the IMA had been occluded. On admission, both patients presented with severe abdominal pain. Investigations revealed acute aortic infection in both patients, combined with substantial AAA enlargement in one. Open surgical infrarenal aortic replacement was performed using homografts, and antibiotic therapy was initiated. After uneventful recovery, both patients were asymptomatic, had intact aortic homografts, and showed no evidence of infection after 12 and 18 months of follow-up, respectively. CONCLUSION: Endovascular infections are a potentially serious complication following percutaneous coil embolization of major aortic branches. Early diagnosis and dedicated therapy are mandatory. Immediate resection of the infected aorta and replacement with homografts in association with prolonged antibiotic treatment showed good midterm results.

New sacral neuromodulation lead for percutaneous implantation using local anesthesia: description and first experience.

PURPOSE: In functional urology today chronic stimulation of the sacral nerves has become one of the most accepted methods of stimulation treatment. Many studies have described the advantage of test stimulation prior to implanting the definitive system to enable effective patient selection. We studied a method aimed at improving lead anchoring by developing a self-blocking electrode with a simple placement procedure, in the process creating a 2-stage approach to full percutaneous implantation that allows a long screening period during the first temporary stimulation stage. MATERIALS AND METHODS: A new tined lead was specifically designed to allow minimally invasive percutaneous lead placement requiring no incision and no additional fascial anchoring. From September 2001 to November 2002, 15 consecutive patients (3 males and 12 females) 27 to 70 years old (mean age 49) underwent this procedure and were prospectively evaluated. No PNE test was performed. RESULTS: Following the first stage screening phase 12 patients were implanted with the implantable pulse generator (IPG), while 3 who did not respond positively to test stimulation (neurogenic voiding dysfunction, urge incontinence and neurogenic urge incontinence in 1 each) did not undergo IPG implantation and had the tined lead removed under local anesthesia. We did not observe any lead displacement during the screening period (average 38.8 days) or during followup of IPG implanted cases (average 11 months, range 5 to 19). CONCLUSIONS: Our results show that the new tined anchoring system is a reliable way to allow truly minimally invasive placement of the chronic lead.

Expression of human beta-defensins 1 and 2 in kidneys with chronic bacterial infection.

BACKGROUND: Constitutive expression and localization of antimicrobial human beta-defensin-1 (HBD-1) in human kidneys as a potential mechanism of antimicrobial defense has been previously reported. Inducible expression of human beta-defensin-2 (HBD-2) has been described in various epithelial organs but not for the urogenital tract. METHODS: We investigated the gene- and protein expression of HBD-1 and HBD-2 by reverse transcriptase-polymerase chain reaction, and immunohistochemistry in 15 normal human kidney samples and 15 renal tissues with chronic bacterial infection. Additionally, cell culture experiments were performed to study HBD gene expression by real-time RT-PCR in response to inflammatory cytokines TNFalpha and IL-1beta as well as lipopolysaccharide from Gram-negative bacteria. RESULTS: Constitutive HBD-1 gene- and protein expression was detected in normal renal tissue and kidneys with chronic infection. As a novel finding, inducible HBD-2 gene- and protein expression was demonstrated in tubulus epithelia with chronic infection but not in normal renal tissue. In pyelonephritic kidneys HBD-1 and HBD-2 expression showed a similar pattern of localization in distal tubules, loops of Henle and in collecting ducts of the kidney. Furthermore, real-time RT-PCR of kidney derived cell lines stimulated with inflammatory agents TNF-alpha, IL-1beta and LPS revealed a strong increase in relative HBD-2 transcription level and also a slight increase in relative HBD-1 transcription level. CONCLUSIONS: Upregulated HBD-2 expression in renal tubulus epithelium indicates a role of a wider range of human defensins for antimicrobial host defense in the urogenital tract than previously recognized.