Prevalence of Abdominal Aortic Aneurysm in Men Aged 65-74 Years in a Metropolitan Area in North-East Spain.

BACKGROUND: A declining prevalence of AAA and a shift in the distribution towards the older population have been observed during the last decade in Europe. The aim was to estimate the current screening prevalence of AAA in men aged 65-74 years in a metropolitan area in north-east Spain and to identify associated risk factors. METHODS: A cross sectional prevalence study in men registered in L'Hospitalet Primary Healthcare Services (Barcelona, Spain) was performed. There were 619 randomly selected subjects (expected prevalence of aneurysm, 5%; accuracy of estimation, ±2%; loss to follow up, 30%). Exclusion criteria were life expectancy <1 year, limited quality of life, previous diagnosis of AAA, prior aorto-femoral surgery, and non-Caucasian. The following were measured: internal diameter of the infrarenal abdominal aorta using ultrasound, cardiovascular risk factors, personal (heart disease, stroke, peripheral vascular disease) and family history (AAA), physical examination, and blood tests. We estimated the prevalence and 95% confidence interval of AAA, and used logistic regression analysis to identify risk factors for AAA. RESULTS: Among the 651 individuals included in the analysis the prevalence of aneurysm was 2.30% (95% CI, 1.30-3.77%). In the regression analysis, AAA was associated with smoking (0-10, 11-20, or >20 cigarettes/day), diagnosis of myocardial infarction, and being taller than the median (165 cm). CONCLUSIONS: The current screening prevalence of AAA among men aged 65-74 years in a metropolitan area in north-east Spain is similar to that in northern Europe. Smoking, myocardial infarction, and height were associated with the presence of AAA.

Discrimination of glaucomatous from non-glaucomatous optic neuropathy with swept-source optical coherence tomography.

OBJECTIVE: To assess the ability of optic nerve head (ONH) parameters, peripapillary retinal nerve fiber layer (pRNFL), and macular ganglion cell layer (GCL) thickness measurements with swept-source optical coherence tomography (SS-OCT), to discriminate between glaucomatous and non-glaucomatous optic neuropathy (GON and NGON). METHODS: This retrospective cross-sectional study involved 189 eyes of 189 patients, 133 with GON and 56 with NGON. The NGON group included ischemic optic neuropathy, previous optic neuritis, and compressive, toxic-nutritional, and traumatic optic neuropathy. Bivariate analyses of SS-OCT pRNFL and GCL thickness and ONH parameters were performed. Multivariable logistic regression analysis was employed to obtain predictor variables from OCT values, and the area under the receiver operating characteristic curve (AUROC) was calculated to differentiate between NGON and GON. RESULTS: Bivariate analyses showed that the overall and inferior quadrant of the pNRFL was thinner in the GON group (P=0.044 and P<0.01), while patients with NGON had thinner temporal quadrants (P=0.044). Significant differences between the GON and NGON groups were identified in almost all the ONH topographic parameters. Patients with NGON had thinner superior GCL (P=0.015), but there were no significant differences in GCL overall and inferior thickness. Multivariate logistic regression analysis demonstrated that vertical cup-to-disc ratio (CDR), cup volume, and superior GCL provided independent predictive value for differentiating GON from NGON. The predictive model of these variables along with disc area and age achieved an AUROC=0.944 (95% CI 0.898-0.991). CONCLUSIONS: SS-OCT is useful in discriminating GON from NGON. Vertical CDR, cup volume, and superior GCL thickness show the highest predictive value.

Health outcomes after the implementation of multidisciplinary clinical guidelines for the care of hip fractures.

BACKGROUND AND OBJECTIVES: This study aims to evaluate the impact of implementing multidisciplinary clinical guidelines in the process of caring for patients with hip fractures. MATERIALS AND METHODS: This work is a pre- and post-intervention prospective study in the Orthogeriatrics Unit of a second-level hospital after implementing multidisciplinary clinical guidelines for hip fracture care. We analyzed patients' baseline characteristics and the variations observed in care provided and in outcome variables in the two periods studied (June 2015-May 2016 and June 2016-May 2017). RESULTS: The baseline characteristics of the population were similar in the pre-intervention period (n = 455) compared to the post-intervention period (n = 456). Patients' mean age was 84.8 ± 6.8 years and 70.8% were women. The implementation of the multidisciplinary clinical guidelines led to a reduction in the mean length of hospital stay (16.9 days vs. 15.6 days, p= .014); improved osteoporosis treatment prescribing (51.6% vs. 88%, p< .001); and reduced episodes of delirium (44% vs. 31.2%, p < .001), bronchospasm (18.3% vs. 12%, p = .019), heart failure (20% vs. 11.5%, p < .001), and COPD exacerbation (7.9% vs. 3.8%, P = .017). We observed an increase in pressure ulcers at discharge (2.9 vs. 9%, P < .001). There were no differences in the percentage of operations in less than 48 h (56% vs. 61.2% p = .64), hospital readmissions (6.9% vs. 5.9%, p = .51), or mortality (5.0% vs. 7.2%, p = .17). CONCLUSIONS: The implementation of multidisciplinary clinical guidelines improved aspects of the care process for patients with hip fracture.

Impulse control disorders and punding in Parkinson's disease: the need for a structured interview.

INTRODUCTION: Impulse control disorders (ICD) including hypersexuality, compulsive gambling, buying, eating, shopping and dopaminergic medication use, have been reported to occur frequently in Parkinson's disease (PD). Punding (complex, repetitive, excessive, non-goal oriented behaviours) have also been described. As patients may not report such behaviours to their neurologist, ICD and punding appear to be under-recognised in clinical practice. METHOD: We Prospectively screened 216 consecutive patients (102 men, age 77±5 years) with idiopathic PD. Patients and their caregivers were encouraged to complete a questionnaire with six questions on symptoms related to ICD and punding. In addition, we obtained a random sample matched by age and sex of 216 patients with idiopathic PD, and retrospective analysis of symptoms related to ICD and punding who had been referred spontaneously. RESULTS: Only 20 cases (9.26%) of 216 patients with PD who answered the questionnaire prospectively presented ICD and / or punding, some involving more than one type of repetitive behaviour and reward-seeking: 7 hypersexuality (3.24%), 2 pathological gambling (0.93%), 4 compulsive buying (1.85%), 2 compulsive eating (0.93%), 8 punding (3.70%) and 1 abuse of medication (0.46%).Of the retrospective sample of 216 patients age- and gender-matched, only 5 patients (2,31%) had spontaneously mentioned these symptoms: 2 hypersexuality (0.93%), 2 pathological gambling (0.93%) and 1 punding (0.46%). CONCLUSIONS: Patients with PD do not spontaneously admit the presence of ICD or punding and these behaviours appear to be under-recognised in clinical practice. A screening questionnaire is needed to ensure their detection.

Colorectal anastomosis during cytoreductive radical surgery in patients with peritoneal surface malignancies. Validation of a new technique (without stoma) to prevent anastomosis leakage in more than 1000 procedures.

OBJECTIVE: To describe a novel end-to-end "true" reinforced stapling colorectal anastomosis and to assess surgical outcomes in a large case series of advanced cancer patients undergoing this procedure. Anastomotic leakage (AL) remains the main concern following surgery for colorectal cancer. METHODS: Between September 2006 and May 2018, in the context of the Catalonian Program of Peritoneal Carcinomatosis, 1193 consecutive patients with advanced abdominal and/or pelvic tumors were included in a prospective single-center study. They underwent cytoreductive radical surgery (CRS) in most cases combined with hyperthermic intraperitoneal chemotherapy (HIPEC). Among other surgical procedures, 374 patients underwent rectal resection and colorectal/ileorectal anastomosis, whether alone or associated to other digestive anastomosis. Key aspects of colorectal anastomosis technique were: (1) complete dissection and mobilization of the distal third of the rectum, (2) placement of a stitch that included both ends of the linear stapling of the rectal stump that was knotted on the anvil of the circular stapler, (3) "cleaning" the fatty tissue of the intestinal ends, (4) adjustment of the height of staples to the thickness of the intestinal wall, and (5) a second layer of interrupted nonperforating sutures placed circumferentially to reinforce the stapled anastomoses. A diverting stoma was not performed. RESULTS: According to clinical criteria, of the 1193 patients included, 296 cases underwent CRS (group 1) and 897 cases CRS + HIPEC (group 2). In group 1, 332 surgical procedures were performed, with 248 digestive anastomoses, of which 98 (39.5%) were colorectal anastomoses, associated to other digestive anastomosis in 37 cases. In group 2, 972 surgical procedures were performed, with 707 digestive anastomoses, of which 263 were colorectal (37.2%), 116 were associated with other digestive anastomosis. Ileocolic anastomosis was the most frequently associated digestive anastomosis. 71 major urinary reconstructions, 283 radical hysterectomies and no diverting stoma were performed. Globally, there was only three colo-ileorectal AL (3/374 = 0.8%). The overall 90-day mortality rate was 0.25%. CONCLUSIONS: A technical modification to create a "true" end-to-end and completely circular reinforced anastomosis effectively prevents anastomotic leakage in patients with advanced tumors undergoing radical resection of the rectum, with no need of diverting stoma.

Automatic detection of patients with nosocomial infection by a computer-based surveillance system: a validation study in a general hospital.

OBJECTIVE: To validate an automated system for the detection of patients with nosocomial infection (NI) in an intensive care unit (ICU). DESIGN: Retrospective analysis of data from the hospital information system. We applied 3 different NI suspicion criteria (positive microbiology reports, antibiotic administration, and diagnosis of clinical infection) and compared the results to those of a prospective NI incidence study done in the ICU during the same period (1999-2002). SETTING: A 250-bed general hospital in Barcelona, Spain. PATIENTS: From April 15, 1999, through June 30, 2002, 1380 patients were admitted to the ICU. Of these, 1043 had an ICU stay of more than 24 hours and were included in the study. RESULTS: At least one NI suspicion criterion was present for 242 patients (23.2%); 2 criteria were present for 184 patients (17.6%); and all 3 criteria were present for 112 (11.7%). Comparison of hospital information system data to the results of the prospective study indicated that the combination of 2 criteria demonstrated the most satisfactory sensitivity (94.3%; 95% confidence interval [CI], 79.5%-99.0%) and specificity (83.6%; 95% CI, 76.8%-88.9%). The positive predictive value was 55.9% (95% CI, 42.5%-68.6%); the negative predictive value was 98.5% (95% CI, 94.2%-99.7%). The system could assign a site of infection for 90.4% of the NIs detected. CONCLUSION: The hospital information system was a useful tool for retrospectively detecting patients with an NI during the ICU stay. Given its high sensitivity, it may be useful as an alert for the NI team.

[Home blood pressure self-monitoring. Influence of the mean calculation used on the diagnosis of white-coat hypertension]. / Automedida de la presión arterial domiciliaria. Influencia del sistema de cálculo de la media en el diagnóstico de la hipertensión de bata blanca.

OBJECTIVE: To describe the variations in the diagnosis performance of home blood pressure self-monitoring (hBPSM) with different methods for mean calculation, in order to diagnose white-coat hypertension (WCH). DESIGN: Multi-centre, descriptive, and comparative study to assess the diagnosis performance of a test method. SETTING: Four primary health care centres. PARTICIPANTS: A total of 157 recently-diagnosed, untreated patients with mild-moderate hypertension took part in the study. METHODS: The results obtained with hBPSM (3 consecutive days with readings in triplicate, morning-night) were compared with a "gold standard" out-patient blood pressure reading (OutBP). RESULTS: Systolic and diastolic BP values of the first day and first reading (morning-night) were higher than the remaining days and readings (linear trend P< .001). Results in hBPSM diagnostic performance using all readings to calculate the mean were: sensitivity (S), 47.6%; specificity (Sp), 77.4%; positive and negative predictive values (PPV and NPV), 58.8% and 68.6%, with positive and negative probability coefficients (PPC and NPC), 2.10 and 0.67. When readings with greater patient alarm reaction (first day and first reading, morning-night) were removed, greater values of S (61.9%) were obtained, albeit at expense of an excessive loss in Sp (64.5%) and without improvement in PPC (1.74). CONCLUSIONS: The diagnostic performance of hBPSM in WCH was low and failed to improve with the use of different systems to calculate mean BP.

Determinants of left ventricular mass in untreated mildly hypertensive subjects: hospitalet study in mild hypertension.

The objectives of this cross-sectional study were to identify the determinants of left ventricular mass in untreated mildly hypertensive subjects at the Hypertension Unit, Department of Internal Medicine, Red Cross Hospital, Hospitalet de Llobregat, Barcelona, Spain. One hundred seventy-one untreated mildly hypertensive subjects, with a mean age of 41.1+/-11.8 years (from 18 to 65 years) were sequentially visited in our Unit; 54% were men. Echocardiographic measurements of good quality were obtained in 142 subjects (83%). Two-dimensional guided M-mode echocardiograms were used and left ventricular mass was estimated according to the Penn convention. Left ventricular mass (LVM) was analyzed as a continuous variable. In the bivariate analysis, the variables that significantly correlated with LVM were patient's height (r = 0.42, P<.0005), weight (r = 0.47, P< or =.0005), heart rate (r = -0.22, P = .01), HDLc (r = -0.30, P = .002), hematocrit (r = -0.28, P = .001), urinary sodium excretion (r = 0.23, P = 0.012), and different measurements from the ambulatory blood pressure profile for 24 h. By means of multiple regression analysis, a maximum of 41.2% of LVM variability could be explained from the factors registered in our study. The final model included age, gender, patient's weight, and diastolic night load from ambulatory blood pressure monitoring. When added to different models, weight and diastolic night load showed a similar strength in predicting left ventricular mass. In untreated patients with mild hypertension, traditional factors such as blood pressure levels explain a maximum of 41.2% of LVM variability. More knowledge is needed about factors that may alter cardiac morphology in the evolution of hypertensive patients.

Blood pressure reactivity to mental stress task as a determinant of sustained hypertension after 5 years of follow-up.

Previous studies have reported an increased risk of developing sustained hypertension (SH) in borderline or mildly hypertensive subjects showing an exaggerated response of blood pressure (BP) to mental stress. The aim of this study was to assess if the response of BP to mental stress tasks is an independent predictor of SH. A total of 89 patients with grade 1 hypertension, aged 18-64 years, 62% males, were included. The mean of follow-up was 5.3 years (s.d. 2.1 years). SH was defined as the development of grades 2-3 hypertension (Systolic BP>or=160 mmHg or diastolic BP>or=100 mmHg) or to be in antihypertensive treatment after follow-up. Two mental stress tasks: mental arithmetic stress task and a stressful interview (SI) were applied at entry. The subjects were classified as hyper-reactors when BP increase was greater than 35 mmHg for systolic BP or greater than 21 mmHg for diastolic BP, according to the results obtained previously in a normotensive control group. In the univariate analysis, the factors associated with the development of SH were age (P=0.0007), office diastolic BP (P=0.014) and hyper-reactivity of BP during a stressful interview (P=0.003). In the Cox regression model, after adjusting for gender, age, and office BP, the hyper-reactivity of BP during SI was an independent predictor of development of SH. In conclusion, the response of BP to mental stress tasks is useful in predicting SH in young and middle-aged subjects with grade 1 hypertension.

Survey of blindness and visual impairment in Bioko, Equatorial Guinea.

AIMS: This study was designed to estimate the prevalence of blindness and its main aetiologies in Bioko, an onchocerciasis endemic zone of Equatorial Guinea. METHODS: Random sampling was applied, proportionally to population distribution into urban or rural areas. All the subjects underwent a basic eye examination by trained nurses. In the presence of any ocular affection or a visual acuity of less than 0.3, the subject was visited by the ophthalmologist. This visit included direct and indirect ophthalmoscopy, anterior segment examination with a slit lamp, and intraocular pressure recording. Blindness and visual impairment were defined by using the WHO criteria. RESULTS: 3218 subjects were screened, with a mean age of 34.1 (SD 21.6) years, ranging from 1 month to 102 years (median 34 years). The overall prevalence of blindness was 3.2% (95% CI: 2.6% to 3.9%). Unilateral blindness was present in 4.2%. Visual impairment was diagnosed in 200 patients (6.8%). More than 20% of the acuities inferior to 0.7 improved when explored with a pinhole. The main causes of blindness were cataracts (61.3%); macular affection (25.3%), optic atrophy (16%), and glaucoma (13.3%). Ocular onchocerciasis was detected in 12 cases (0.4%). CONCLUSION: Ocular onchocerciasis was very uncommon in an area of high endemicity. Results also pointed at the lack of basic ophthalmologist eye care and optician resources in the island.

Target-organ damage and cardiovascular risk profile in resistant hypertension. Influence of the white-coat effect.

BACKGROUND: It is difficult to draw definite conclusions about the prevalence and clinical characteristics of patients with resistant hypertension because of the heterogeneity of study designs described in published studies. OBJECTIVES: To estimate the prevalence of resistant hypertension, the associated cardiovascular risk factors and the degree of target-organ damage, and to analyze the differences between true resistant hypertension (TRH) and white-coat resistant hypertension (WCRH). DESIGN: Cross-sectional study. METHODS: Patients who visited the Hypertension Clinic with resistant hypertension were sequentially included. Resistant hypertension was defined as an average of three measurements of systolic blood pressure, >/= 160 mmHg or a diastolic blood pressure >/= 95 mmHg, or both, in patients treated with a triple-drug regimen, over at least 2 months. Twenty-four-hour ambulatory blood pressure monitoring and M-mode bi-dimensional echocardiography were performed. WCRH was defined as a mean daytime ambulatory blood pressure

[Impact of thrombolytic therapy on short and long-term survival of a cohort of patients with acute myocardial infarction consecutively admitted to all the hospitals of a health care area. GESIR-5 study]. / Impacto de la trombólisis sobre la supervivencia a corto y largo plazo de una cohorte de pacientes con infarto agudo de miocardio atendidos de forma consecutiva en todos los hospitales de una región sanitaria. Estudio GESIR-5.

AIM: This study aims to assess the application of thrombolysis in patients with acute myocardial infarction admitted to all the hospitals of a health care area in Catalonia (Spain), and to estimate the effect of thrombolysis on short and long-term survival. METHODS: From May 1992 to May 1993, all the patients with myocardial infarction admitted to the hospitals of the Costa de Ponent area in the first 72 hours after the initial symptoms were consecutively included in this prospective study. Information on pre-hospital phase, emergency room management and hospitalization was collected. All the patients discharged alive from hospital were followed up by telephone one and four years after hospital admission. RESULTS: 521 patients aged 74 years or less were included. Thrombolytic therapy was applied in 35.3%. There were no statistically significant differences in the proportion of thrombolysis between hospitals with or without intensive care or coronary units. Ten patients died in the emergency room; in the remaining cases, the 28-day case fatality was 10.0%. The effect of thrombolytic treatment on 28-day case fatality was estimated in a logistic regression model, after controlling for age, gender, Killip, ventricular arrhythmia and location of infarction (OR: 0.36; CI 95%: 0.15-0.88). In 28-day survivors, the 4-year cumulated probability of survival was 88.4%, being significantly higher in the group who had received thrombolytic therapy. CONCLUSIONS: In the population studied, 28-day case mortality of acute myocardial infarction is similar to that reported in other Mediterranean regions. The benefits of thrombolysis in the acute phase are found to persist after 4 years.

[Relationship in cardiovascular reactivity to mental stress and early involvement of target organs in non-treated mild arterial hypertension. Hospitalet Study]. / Relación entre reactividad cardiovascular al estrés mental y afectación temprana de órganos diana en la hipertensión arterial ligera no tratada. Estudio Hospitalet.

BACKGROUND: It has been previously reported that an exaggerated response of blood pressure to mental stress tasks is associated to an increased cardiovascular risk. The objective of this cross-sectional study, with sequential inclusion of subjects who met the inclusion criteria, was to asses the relationships between the response of blood pressure and heart rate to two different mental stress tasks and early target organ-damage, defined as abnormalities in the echocardiogram and/or an increase of urinary albumin excretion (UAE) or microalbuminuria, in untreated mild hypertensive subjects. SUBJECTS AND METHODS: Two hundred and eleven subjects aged 18 to 65 years (56% males) with mild hypertension (SBP between 140-180 mmHg and/or DBP between 90-105 mmHg) were included in Hospitalet Study. One hundred and thirty seven of them accepted to participate in the study of cardiovascular reactivity. Two different tasks were applied in the same day: a stressful interview (SI) and a mental arithmetic stress tasks (MAST). An echocardiogram of good quality was obtained in 123 cases (89.8%) and 24 h UAE was measured in 108 cases (78.8%). RESULTS: The prevalence of left ventricular hypertrophy was 21.1% (95% CI = 14.3-29.4) and the prevalence of microalbuminuria was 15.7% (95% CI = 9.4-24.4%). After adjusting for the baseline blood pressure, a significant correlation was observed between increase of systolic BP during SI and UAE (r = 0.21; p = 0.03) and between increase of diastolic BP during SI and relative wall thickness (r = 0.32; p < 0.005). When we analyzed the changes of BP during MAST, a significant correlation was observed between increase of diastolic BP (adjusted for baseline diastolic BP) and left atrial size (r = 0.21; p = 0.02). We did not find any significant correlation between the increases of BP (systolic or diastolic) during MAST or increases of heart rate during both tasks and left ventricular mass index or UAE. CONCLUSIONS: A weak correlation was observed between cardiovascular reactivity of blood pressure during mental stress tasks and early target organ damage in mild hypertension. We did not find any relationship between the response to heart rate during the tasks and early target organ damage.

IMASIS. A multicenter hospital information system--experience in Barcelona.

The present study aimed to analyse physicians' attitudes towards IMASIS, and their potential influence on IMASIS medical record project. IMAS (Institut Municipal d'Assistència Sanitària) is the health care organisation of the City Council of Barcelona. IMAS hospital information system (IMASIS), which first applications were designed and implemented in 1984, is currently facing a new phase, focused on clinical information management. Our approach included a personal interview with representatives of every hospital unit, and a self-administered questionnaire distributed to every clinician. Both provided a worthy insight into the cultural patterns to be considered in the HIS implementation process. Moreover, the results helped to define the subsequent steps of IMASIS evolution. Our experience is proposed as a tool to assess clinical informations systems from a user point of view.

[Survey on the preoperative evaluation in Catalonian surgical centers. II. What is the attitude and opinion of the professionals involved?]. / Encuesta sobre la valoración preoperatoria en los centros quirúrgicos catalanes (II). Cuál es la actitud y la opinión de los profesionales implicados?

OBJECTIVE: Previous studies have provided evidence of the existence of differences in preoperative assessment practices and have questioned the usefulness of generalized testing for all patients. The objective of this study was to determine the attitudes and opinions of anesthesiologists and surgeons about their application of preoperative assessment procedures and their knowledge of the scientific principles underlying their practice. SUBJECTS AND METHODS: A questionnaire was mailed to 227 specialists in anesthesiology and postoperative intensive care, general and gastrointestinal surgery, orthopedic surgery and traumatology of all hospitals in Catalonia (Spain) with active operating theaters. RESULTS: The overall response rate was 61% of the surveyed population, with 86% of the Catalan hospitals represented. The medical literature supports the routine performance of a chest x-ray and an ECG in the opinion of 17 and 26% of the respondents, respectively. Those two procedures are always ordered by 43 and 37%, respectively, even if they believe that the medical literature does not support generalized application. Legal protection was given as the reason for routine ordering of preoperative tests in asymptomatic patients, and 89% believed that a protocol for selective preoperative assessment procedures would improve efficiency. CONCLUSIONS: This study reveals a discrepancy between the opinions of professionals involved in preoperative assessment and their real practice in Catalan hospitals, probably influenced by perceived need for legal protection.

[Survey on the preoperative evaluation in Catalonian surgical centers. I. What is the preoperative routine?]. / Encuesta sobre la valoración preoperatoria en los centros quirúrgicos catalanes (I). Cuál es la práctica preoperatoria?

OBJECTIVE: To describe the preoperative assessment procedures currently used in hospitals in Catalonia (Spain). SUBJECTS AND METHODS: The study population consisted of all heads of departments of anesthesiology, general and gastrointestinal surgery, orthopedic surgery and traumatology of hospitals and clinics in Catalonia with active operating theaters. Information was obtained by self-administered questionnaire prepared by an interdisciplinary team. RESULTS: Of the 227 questionnaires sent, 139 (61%) were answered and returned. A preoperative assessment visit was programmed according to 112 (81%) of the respondents and 123 (89.8%) reported following a protocol that included ordering preoperative tests. The same tests were ordered for all patients by 25% of the respondents. A chest film and an ECG were always ordered according to 61 and 65%, respectively, and always when the patient was over a certain age according to 36 and 32%, respectively. Coagulation and blood sugar tests and a complete blood workup were always ordered according to 94%, 95% and 89%, respectively. Tests were considered valid for less than six months by most. CONCLUSIONS: This survey provides evidence of widespread use of preoperative assessment, although application falls short of including all scheduled patients. According to these results, selective protocols for ordering complementary preoperative tests are rarely applied.

[Effectiveness of self-monitoring of blood pressure in white coat hypertension diagnosis. Rationale and design]. / Efectividad de la automedida de la presión arterial en el diagnóstico de la hipertensión clínica aislada. Justificación y diseño del estudio.

OBJECTIVE: To assess the effectiveness of blood pressure self-monitoring at home in front of 24-h blood pressure ambulatory measurement in isolated clinical hypertension diagnosis. DESIGN: Comparative study of repeated measurements of self-monitoring home BP and 24-h ambulatory BP measurement in a hypertensive patients sample. SETTING AND SUBJECTS TO STUDY: Mild-moderate essential hypertensive patients newly diagnosed or previously diagnosed in which suspect isolated clinical hypertension (BP>140/90 mm Hg in clinical setting repeatedly). It needs a sample of 182 hypertensive patients seen at urban primary health care. PRINCIPAL MEASUREMENTS: We compute the isolated clinical hypertension prevalence, the sensibility, specificity and positive and negative predictive values, with 95% confidence intervals. DISCUSSION: Prove the effectiveness of blood pressure self-monitoring at home in insolated clinical hypertension diagnosis, can involve an important cost saving for health care system as in hypertensive patient management (medicines and office visits), as in diagnosis equipment.

Controlling for chance agreement in the validation of medical expert systems with no gold standard: PNEUMON-IA and RENOIR revisited.

In the validation of medical expert systems, agreement among different human specialists on a random sample of cases may be taken as a substitute to a missing gold standard. Distance measures between pairs of experts, extensively described in previous studies, do not take into account the influence of chance-expected agreement. A weighted kappa index, with three different weighting schemes, is proposed as an alternative to be applied in the general situation of N cases assessed by E experts about K possible diagnoses, each of them qualified with one of G ordinal categories. A hierarchical cluster analysis, applied to the kappa matrices generated, allows for the classification of the expert system among clinical specialists, providing a relative assessment of its diagnostic ability. The above methodology is applied to the validation of two medical expert systems, PNEUMON-IA and RENOIR.

IMASIS computer-based medical record project: dealing with the human factor.

The Institut Municipal d'Assistència Sanitària (IMAS) is a health care organization in Barcelona, comprising two general hospitals, a psychiatric hospital, a surgical clinic, a geriatric center, some primary care clinics, and a research institute. Since 1984, IMAS has been engaged in creating a multicenter integrated hospital information system (IMASIS). Currently, IMASIS offers the possibility to manage administrative data, laboratory results, pathology and cytology reports, radiology reports, and pharmacy inpatient orders; it also shares this information on-line among IMAS centers. IMASIS users may also work with a word processor, a spreadsheet, a database, or a statistical package and have access to MEDLINE. A second phase of IMASIS development began in December 1993 focused on clinical information management. The goal was to move towards an integrated multimedia medical record [1]. As a first step, the implementation experiences of the most advanced hospital information systems around the world were studied. Some of these experiences detected behavioral, cultural, and organizational factors [2] as the main sources of delay, or even failure, in HIS projects. A preliminary analysis to define such factors, assess their potential impact, and introduce adequate measures to deal with them seemed unavoidable before structuring of the project. In our approach to physician attitudes analysis, two survey techniques were applied. First, every hospital service head was contacted to schedule an interview, with either a service representative or a group of staff physicians and residents. The aim was to provide detailed information about project objectives and collect personal opinions, problems encountered in the current HIS, and specific needs of every medical and surgical specialty (including imaging needs). Every service head was asked to distribute a questionnaire among all clinicians, which assessed frequency of use of IMASIS current applications, user's satisfaction level, problems to be solved in utilization of the system, errors detected in the systems' database, and the personal interest in participating in the IMASIS project. The questionnaire was also intended to be a tool to monitor IMASIS evolution. Our study showed that medical staff had a lack of information about the current HIS, leading to a poor utilization of some system options. Another major characteristic, related to the above, was the feeling that the project would negatively affect the organization of work at the hospitals. A computer-based medical record was feared to degrade physician-patient relationship, introduce supplementary administrative burden in clinicians day-to-day work, unnecessarily slow history taking, and imply too-rigid patterns of work. The most frequent problems in using the current system could be classified into two groups: problems related to lack of agility and consistency in user interface design, and those derived from lack of a common patient identification number. Duplication of medical records was the most frequent error detected by physicians. Analysis of physicians' attitudes towards IMASIS revealed a lack of confidence globally. This was probably the consequence of two current features: a lack of complete information about IMASIS possibilities and problems faced when using the system. To deal with such factors, three types of measures have been planned. First, an effort is to be done to ensure that every physician is able to adequately use the current system and understands long-term benefits of the project. This task will be better accomplished by personal interaction between clinicians and a physician from the Informatics Department than through formal teaching of IMASIS. Secondly, a protocol for evaluating the HIS is being developed and will be systematically applied to detect both database errors and systemUs design pitfalls. Finally, the IMASIS project has to find a convenient point for starting, to offer short-term re