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Biomedical subjects

M Andreu

Publications and source records attributed to M Andreu.

At least 37 records · Page 2Linked to original sources
PubMed1999

Risk of a first community-acquired spontaneous bacterial peritonitis in cirrhotics with low ascitic fluid protein levels.

BACKGROUND & AIMS: Long-term primary antibiotic prophylaxis of spontaneous bacterial peritonitis has been suggested to be useful in cirrhotic patients with low ascitic fluid protein levels. However, it is unlikely that all such patients need prophylactic treatment. The aim of this study was to identify the group of cirrhotic patients with low ascitic fluid protein levels at high risk of developing a first episode of spontaneous bacterial peritonitis during outpatient follow-up. METHODS: One hundred nine cirrhotic patients with low ascitic fluid protein levels and without previous episodes of spontaneous bacterial peritonitis were followed up in an outpatient clinic. RESULTS: Twenty-eight patients developed a first spontaneous bacterial peritonitis episode. In the multivariate analysis, serum bilirubin level (>3.2 mg /dL) and platelet count (<98.000/mm(3)) independently correlated with the risk of developing the first spontaneous bacterial peritonitis (P < 0.01 and P < 0.05, respectively). According to the median relative risk coefficient, a low-risk group (relative risk <1.09) and a high-risk group (relative risk >1.09) were established. The probability of developing a first spontaneous bacterial peritonitis episode at 1-year follow-up was significantly higher in the high risk-group (low-risk group, 23.6%; high-risk group, 55%; P < 0.01) as a consequence of a higher probability of the first community-acquired episode (13.7% vs. 47.6%, respectively, P < 0.01). One-year probability of survival was significantly lower in the high-risk group (low-risk group, 57.6%; high-risk group, 38%, P < 0.05). CONCLUSIONS: Cirrhotic patients with low ascitic fluid protein levels (</=1 g /dL) and high bilirubin level and/or low platelet count are at high risk of developing a first episode of spontaneous bacterial peritonitis during long-term follow-up.

Ascitic Fluid↗
PubMed1999

Total paracentesis in cirrhotic patients with tense ascites and dilutional hyponatremia.

OBJECTIVE: The safety of large-volume paracentesis with plasma expander infusion in ascitic cirrhotic patients with advanced liver disease, hyponatremia, or renal failure has not been elucidated. Our aim was to investigate the safety of total paracentesis in cirrhotic patients with ascites and severe hyponatremia. METHODS: Forty-five cirrhotic patients with tense ascites were treated with total paracentesis and infusion of plasma expanders. At inclusion, 20 patients showed severe hyponatremia (serum sodium <130 mEq/L). In the remaining 25 patients, serum sodium was >130 mEq/L (range, 133-146 mEq/L). RESULTS: Plasma renin activity (PRA) and plasma aldosterone concentration (PAC) were significantly higher in patients with hyponatremia (PRA: 19.7 +/- 5.8 ng/mL/h; PAC: 217 +/- 35 ng/dL) than in those patients without hyponatremia (PRA: 4.9 +/- 1.1 ng/mL/h; PAC: 95 +/- 31 ng/dL), indicating a more severe systemic hemodynamic deterioration. After paracentesis, PRA and PAC increased similarly in both groups of patients. Serum sodium levels remained unchanged after paracentesis in patients with hyponatremia (127 +/- 0.5 to 128 +/- 1.5 mEq/L) and decreased slightly in patients without hyponatremia (137 +/- 1 to 135 +/- 1 mEq/L; p < 0.005). The incidence of complications during the first hospitalization, the probability of readmission for complications of cirrhosis, and the probability of survival at 1 yr were similar in both groups of patients. CONCLUSIONS: These results indicate that therapeutic paracentesis is a safe treatment for tense ascites in cirrhotic patients with severe hyponatremia.

Adult↗
PubMed1999

Association between coffee drinking and K-ras mutations in exocrine pancreatic cancer. PANKRAS II Study Group.

STUDY OBJECTIVE: To analyse the relation between coffee consumption and mutations in the K-ras gene in exocrine pancreatic cancer. DESIGN: Case-case study. Consumption of coffee among cases with the activating mutation in the K-ras gene was compared with that of cases without the mutation. SETTING AND PATIENTS: All cases of pancreatic cancer newly diagnosed at five hospitals in Spain during three years were included in the PANKRAS II Study (n = 185, of whom 121 whose tissue was available for molecular analysis are the object of the present report). Over 88% were personally interviewed in hospital. DNA was amplified from paraffin wax embedded tissues, and mutations in codon 12 of K-ras were detected by the artificial RFLP technique. MAIN RESULTS: Mutations were found in tumours from 94 of 121 patients (77.7%). Mutations were more common among regular coffee drinkers than among non-regular coffee drinkers (82.0% v 55.6%, p = 0.018, n = 107). The odds ratio adjusted by age, sex, smoking and alcohol drinking was 5.41 (95% CI 1.64, 17.78). The weekly intake of coffee was significantly higher among patients with a mutated tumour (mean of 14.5 cups/week v 8.8 among patients with a wild type tumour, p < 0.05). With respect to non-regular coffee drinkers, the odds ratio of a mutated tumour adjusted by age, sex, smoking and alcohol drinking was 3.26 for drinkers of 2-7 cups/week, 5.77 for drinkers of 8-14 cups/week and 9.99 for drinkers of > or = 15 cups/week (p < 0.01, test for trend). CONCLUSIONS: Pancreatic cancer cases without activating mutations in the K-ras gene had drank significantly less coffee than cases with a mutation, with a significant dose response relation: the less they drank, the less likely their tumours were to harbour a mutation. In exocrine pancreatic cancer the K-ras gene may be activated less often among non-regular coffee drinkers than among regular drinkers. Caffeine, other coffee compounds or other factors with which coffee drinking is associated may modulate K-ras activation.

Adolescent↗
PubMed1998

Hemodynamic changes in patients developing effective hypovolemia after total paracentesis.

BACKGROUND/AIMS: In many centers paracentesis is considered the treatment of choice for tense ascites. However, the mechanism of effective hypovolemia after paracentesis, the main complication associated with this procedure, remains unknown. In the current study, systemic hemodynamics was sequentially studied before and after total paracentesis in 46 patients with cirrhosis and tense ascites. The aim of the study was to assess the mechanism of effective hypovolemia after paracentesis. METHODS: Plasma renin activity and aldosterone, mean arterial pressure, cardiac output (ECO-Doppler) and systemic vascular resistance were measured before, and 3 h, 6 h and 6 days after total paracentesis associated with plasma volume expansion. RESULTS: Effective hypovolemia after paracentesis (defined as 50% increase in plasma renin activity up to a level over 4 ng x m(-1) x h(-1) at the 6th day after paracentesis) occurred in 20 cases [plasma renin activity increased from 8+/-17 to 19+/-2.7 ng x m(-1) x h(-1)]. In the remaining 26 cases no changes in plasma renin activity [8.5+/-2.4 vs. 8.7+/-2.2 ng x m(-1) x h(-1)] were observed. The amounts of ascitic fluid volume removed were similar. Effective hypovolemia after paracentesis was associated with a significant decrease in mean arterial pressure (89+/-2 vs. 81+/-3 mmHg) and systemic vascular resistance [1263+/-67 vs. 1014+/-80 dyn x s(-1) x cm(-5)] 6 days after treatment. In contrast, no significant changes in these parameters were observed in patients not developing this complication. In the whole group of patients a significant inverse relation was observed between changes in plasma renin activity and in systemic vascular resistance (r=0.74;p< 0.001). CONCLUSIONS: These results indicate that effective hypovolemia after paracentesis in cirrhosis is predominantly due to an accentuation of the arteriolar vasodilation already present in these patients.

Adult↗
PubMed1998

Learning from case reports: diagnostic issues in an epidemiologic study of pancreatic cancer.

Epidemiologic studies on exocrine pancreatic cancer show a large heterogeneity in diagnostic criteria applied to define "caseness." Reanalyses conducted after review of diagnostic information have yielded substantially different results than those based on more crude classifications of disease. During a multicenter prospective study on mutations in the K-ras gene in pancreatic and biliary diseases, hospital diagnoses from 602 patients were reviewed by a panel of experts. There were two main motivations to do so: a generic interest for the quality of the diagnostic data, and the anticipation that a firm diagnosis could be needed to assess whether patients whose tumors did not harbor the mutation were true negatives or false negatives. In addition, the review of diagnoses was helpful to minimize tissue misclassification, and it had a high educational value for clinicians and epidemiologists. This article illustrates why and how this was so through a brief presentation of the 10 most significant cases. With respect to selection and classification of subjects, the main issues that studies on pancreatic cancer need to address are the differential diagnosis of exocrine pancreatic cancer and pancreatitis, the differential diagnosis of exocrine pancreatic cancer and other abdominal tumors, and the use of survival as a hallmark of pancreatic cancer. In epidemiologic studies of pancreatic cancer, it is warranted that a panel of experts centrally reviews all the existing diagnostic evidence (cytohistological and other) of all patients, regardless of whether they have cytohistological confirmation and of their hospital discharge diagnosis.

Adenocarcinoma↗
PubMed1997

Continuous versus inpatient prophylaxis of the first episode of spontaneous bacterial peritonitis with norfloxacin.

Cirrhotic patients with ascites and low ascitic fluid total protein and/or high serum bilirubin levels are at high risk to develop the first episode of spontaneous bacterial peritonitis during long-term follow-up. The aim of the present study was to determine the efficacy of continuous long-term selective intestinal decontamination with norfloxacin in the prevention of this complication. One hundred nine cirrhotic patients with ascites and ascitic fluid total protein levels of < or = 1 g/dL or serum bilirubin levels of > 2.5 mg/dL without previous spontaneous bacterial peritonitis were prospectively randomized into two groups: group 1 (n = 56) received norfloxacin, 400 mg daily administered orally, and group 2 (n = 53) was the long-term control group, receiving norfloxacin only during hospitalization. During a mean follow-up of 43 +/- 3 weeks, there was one spontaneous bacterial peritonitis (1.8%) in group 1 and 9 (16.9%) in group 2 (P < .01). The incidence of community-acquired spontaneous bacterial peritonitis was lower in group 1 (1.8% vs. 13.2%, P < .05), whereas the incidence of nosocomial spontaneous bacterial peritonitis (0% vs. 3.7%) and the incidence of extraperitoneal infections (25% vs. 24.5%) were similar in both groups (P = NS). The actuarial probability of survival at 18 months was 75% in group 1 and 62% in group 2 (P = NS). Resistance to norfloxacin was observed in 9 of 10 (90%) Escherichia coli isolated in infections from group 1 and in 4 of 11 (36.3%) from group 2 (P < .05). The overall incidence of infections caused by norfloxacin-resistant bacteria was higher in group 1 (19.6% vs. 15%), but it did not reach statistical significance. Continuous long-term selective intestinal decontamination with norfloxacin is effective in preventing the first spontaneous bacterial peritonitis in cirrhotic patients at high risk. However, the emergence of infections caused by norfloxacin-resistant bacteria must be weighed carefully against the benefits of continuous long-term prophylaxis.

Anti-Infective Agents↗
PubMed1997

Autonomic dysfunction in patients with non-alcoholic chronic liver disease.

AIMS: To assess the presence of autonomic neuropathy in patients with non-alcoholic chronic liver disease and its relationships with the severity of liver damage. METHODS: Thirty non-alcoholic patients with chronic liver disease and 26 healthy control subjects were studied. The silicone imprint technique was used to quantify the number of functioning sweat glands in order to assess peripheral sympathetic dysfunction. Heart rate variations in response to deep breathing at 6 per minute (deltaR6), to a Valsalva maneuver, and with orthostatism (RRmax/RRmin) were determined to assess parasympathetic vagal function. RESULTS: Mean values for autonomic tests were significantly lower in the group of patients with non-alcoholic chronic liver disease than in the control subjects. The number of activated sweat glands in the foot was abnormal in 19 (63%) patients. Among vagal tests, Valsalva ratio was abnormal in 14 (46%) and deltaR6 in 11 (36%) patients with liver disease. Vagal neuropathy (two or more abnormal heart rate tests) was definite in nine patients (30%). CONCLUSIONS: A high prevalence of abnormalities in both sympathetic and parasympathetic function tests, with a poor relationship with liver function parameters, has been found in patients with non-alcoholic chronic liver disease.

Adult↗
PubMed1995

Spontaneous bacterial peritonitis in cirrhotic patients treated using paracentesis or diuretics: results of a randomized study.

Diuretic treatment in cirrhotic patients with ascites increases ascitic fluid concentration of total protein and complement components, and opsonic activity. These changes are not observed in patients treated with paracentesis. Based on these data it has been suggested that therapeutic paracentesis may be associated with an increased risk of spontaneous bacterial peritonitis (SBP) development. To assess this possibility, 80 cirrhotic patients with tense ascites were randomly allocated in two therapeutic groups: group 1 (40 patients) was treated with total paracentesis associated with plasma volume expansion and group 2 was treated with diuretics. After mobilization of ascites, patients from both groups received diuretics to avoid reaccumulation of ascites; cases that developed tense ascites during follow-up (mean follow-up period, 60 +/- 6 and 55 +/- 4 weeks, respectively) were treated according to initial randomization. Patients from both groups had similar results regarding baseline clinical and standard laboratory data, ascitic fluid concentration of total protein, complement components, and opsonic activity. Sixteen patients (7 from group 1 and 9 from group 2) developed SBP during the study period. The 4-week and 1-year probability of SBP occurrence were 2.5% and 18.6%, respectively, in group 1 patients, and 11.9% and 24%, respectively, in group 2 patients. Therefore, our study indicates that therapeutic paracentesis does not increase the early- and long-term risk of SBP development in cirrhotic patients with tense ascites.

Ascites↗
PubMed1994

Diagnostic certainty and potential for misclassification in exocrine pancreatic cancer. PANKRAS I Project Investigations.

Whereas over the last decade epidemiologic studies on exocrine pancreatic cancer (EPC) continued to show a remarkable heterogeneity in diagnostic criteria applied to define caseness, the actual magnitude and consequences of misclassification remain largely unexplored. The objectives were: (1) to estimate the degree of certainty with which cases of EPC are diagnosed in the two participating hospitals (to this end a diagnostic certainty classification (DCC) was developed; (2) to test whether characteristics of cases differed by degree of diagnostic certainty; and (3) to assess what influence different definitions of case might have on risk estimates for tobacco and alcohol. All cases with a discharge diagnosis of EPC who attended at the Hospital del Mar between 1980-90 and at the Hospital Son Dureta between 1983-90 were identified through their respective tumor registries, and their clinical records were reviewed. Only 52% of 140 cases were classified in the group with a higher probability of EPC (group H). Diagnostic certainty appeared somewhat greater among women (age-adjusted odds ratio [ORa] 1.60, p = 0.18). Group H showed a higher proportion of cases with an interval from first symptom to diagnosis < or = 1 month (ORa = 2.38, p < 0.05) and the proportion of adenocarcinomas was slightly higher than in less certain cases (group L) (p = 0.051). A radical treatment was exclusively attempted in group H (p < 0.001). DCC cut-off points had a significant effect on the proportion of smokers and of alcohol drinkers, as well as on the percent of cases with pathological (cytohistological) confirmation. The proportion of cases unlikely to be of pancreatic origin in spite of having pathological confirmation was high enough to cause significant misclassification bias. Because past exposure to certain risk factors may differ among cases with different diagnostic certainty, we suggest to initially include in the case group patients who in spite of lacking pathological confirmation have strong clinical evidence supporting the diagnosis of EPC; subsequently, risk estimates should be computed across strata of diagnostic certainty to assess whether heterogeneity exists. In exocrine pancreatic cancer the impact of misclassification of disease status upon etiologic and prognostic estimates deserves at least as much attention as misclassification of exposure.

Adenocarcinoma↗
PubMed1994

Total paracentesis with dextran 40 vs diuretics in the treatment of ascites in cirrhosis: a randomized controlled study.

The aim of the current study was to compare total paracentesis associated with dextran-40 infusion with diuretics in the treatment of tense ascites in patients with cirrhosis. Eighty patients were randomly allocated to two groups: 40 patients were treated with paracentesis plus dextran-40 infusion (8 g per liter of ascitic fluid removed), and 40 patients with diuretics. After treatment patients were discharged with diuretics, and patients developing tense ascites during follow up (54 +/- 4 weeks) were treated according to their initial schedule. Paracentesis was more effective than diuretics in mobilizing the ascitic fluid. The incidence of complications was significantly higher (p < 0.05) in the diuretic group (38%) than in the paracentesis group (15%). This difference was mainly due to a higher incidence of hepatic encephalopathy in the former group (30% vs. 2.5%). A significantly higher incidence of hepatic encephalopathy was also observed in the diuretic group during the follow-up readmissions for ascites recurrence. There were no significant differences between the two treatment groups in the probability of survival after inclusion. Plasma renin activity and plasma aldosterone concentration measured before and 2 and 6 days after paracentesis in 20 randomly selected patients increased significantly (p < 0.05) (baseline values: 5.3 +/- 1.4 ng.ml-1.h-1 and 63 +/- 21 ng/dl; 48 h after paracentesis: 11.7 +/- 3.9 ng.ml-1.h-1 and 99 +/- 31 ng/dl; 6 days after paracentesis: 10.9 +/- 3 ng.ml-1.h-1 and 110 +/- 27 ng/dl).(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1993

Risk factors for spontaneous bacterial peritonitis in cirrhotic patients with ascites.

BACKGROUND: This study was performed to investigate the risk factors for a first episode of spontaneous bacterial peritonitis in cirrhotic patients. METHODS: One hundred ten cirrhotics with sterile ascites, without previous spontaneous bacterial peritonitis (SBP), were included from March 1988 to October 1989 and followed up until October 1990 (follow-up, 46 +/- 3.5 weeks; range, 4-120 weeks). RESULTS: Twenty-eight patients (25.45%) suffered SBP. In multivariate analysis (Cox's regression model) including only variables commonly used in clinical practice, ascitic fluid protein concentration and serum bilirubin level independently correlated with first SBP development. Using these two variables the relative risk of a first SBP episode was calculated for each patient. According to the median relative risk coefficient (1.2), a low-risk group (relative risk, < 1.2) and a high-risk group (relative risk, > 1.2) were established. Kaplan-Meier estimates of patients free of SBP were significantly higher in the low-risk group. CONCLUSIONS: The probability of a first SBP episode is significantly influenced by the antimicrobial capacity of ascitic fluid and hepatic function.

Ascites↗
PubMed1990

Immunocytochemistry of thyroid C-cell complexes in dogs.

Ten thyroid C-cell complexes from five male and five female Beagle dogs, 1 to 2 years old, were studied using single and double immunocytochemical staining with the peroxidase-antiperoxidase technique. The antigens tested included thyroglobulin, calcitonin, calcitonin gene-related peptide, somatostatin, neuron specific enolase, and neurotensin. All C-cell complexes contained four cell types in various proportions: 1) follicular cells staining for thyroglobulin; 2) C-cells staining for calcitonin, calcitonin gene-related peptide, and neuron specific enolase; 3) stellate cells and cuboidal cells in follicle-like structures staining positively for somatostatin; and 4) undifferentiated cells staining negatively for all antigens. No positive immunoreactivity for neurotensin was detected. These findings support the hypothesis that thyroid C-cell complexes are ultimobranchial remnants that can give rise to thyroid follicles and C-cells.

Animals↗