Secular changes in Paget's disease: contrasting changes in the number of new referrals and in disease severity in two neighboring regions of Spain.

SUMMARY: We studied the changes in the number of new referrals with Paget's disease of bone (PDB) and severity of PDB in a high prevalence focus and its neighboring region. Referral of patients changed only in the high prevalence focus. The severity of PDB decreased in both regions. These results could suggest the effects of an environmental influence on disease activity. INTRODUCTION: The prevalence and severity of PDB have decreased in several countries over recent years. We previously reported a high radiological prevalence of PDB in Vitigudino. Here we sought to determine if secular changes in the number of new referrals and severity of PDB had occurred over recent years. METHODS: We studied 280 patients with clinically diagnosed PDB who were evaluated at a regional referral center for metabolic bone disease between 1986 and 2009. Changes in the number of new referrals were calculated by relating these data to the number of subjects at risk as determined by population registers. Trends in disease severity were analyzed with alkaline phosphatase (ALP) activity and disease extent on scan. RESULTS: Referrals from the Vitigudino region increased substantially between 1986 and 2003 but fell markedly between 2004 and 2009, although by this time there had been depopulation of the region due to emigration. No significant changes in the rates of referral occurred in the remainder of Salamanca. ALP activity and disease extent decreased in Salamanca, but only ALP activity decreased in Vitigudino. Referrals rate and severity of PDB in Vitigudino were greater than in the remainder of Salamanca. CONCLUSIONS: Referral of patients with clinically diagnosed PDB has remained stable for most of Salamanca during the past 24 years, but substantial changes have been observed in Vitigudino. In agreement with other reports, the severity of PDB has decreased in both regions consistent with the effects of an environmental influence on disease activity.

Evaluation of a therapeutic vaccine for the prevention of recurrent urinary tract infections versus prophylactic treatment with antibiotics.

INTRODUCTION AND HYPOTHESIS: Urinary tract infections (UTIs) are considered the most common bacterial infections, especially in women. The objective of this study was to evaluate the use of the sublingual bacterial vaccine Uromune® in order to prevent recurrent UTIs (RUTIs). METHODS: This study was conceived as a multicenter observational study. The clinical history of 319 women who presented at least 2 episodes of UTI in the last 6 months or 3 in 12 months was reviewed. Data related to treatment and clinical evolution were recorded and analyzed. A total of 159 patients received prophylactic treatment with Uromune® for a period of 3 months (group A) and 160 with sulfamethoxazole/trimethoprim 200/40 mg/day for a period of 6 months (group B). Uromune® contained an inactivated bacterial cell suspension of selected strains of Escherichia coli, Klebsiella pneumoniae, Proteus vulgaris, and Enterococcus faecalis. RESULTS: Patients in group A experienced a highly significant reduction in the number of infections compared to patients in group B. In the first 3 months, the mean number of infections was 0.36 versus 1.60 (P < 0.0001), respectively. A significant reduction was also observed after 9 and 15 months (P < 0.0001). The numbers of patients who did not have any UTI at 3, 9, and 15 months were 101, 90, and 55 in group A versus 9, 4, and 0 in group B (P < 0.0001). CONCLUSIONS: The results obtained in this study favor the use of this bacterial-based therapeutic vaccine as an effective strategy to reduce frequency, duration, severity, and costs of RUTIs.

Clinical profile and epidemiological changes of clear cell renal carcinoma during 12 years in our health area.

OBJECTIVES: To investigate changes in the epidemiology and clinical profile of patients diagnosed with renal clear cell carcinoma in a community health area over 12 years. METHODS: Retrospective analysis of epidemiological characteristics and clinical profile of patients diagnosed with renal clear cell carcinoma in a health area composed of a population of 353.619 inhabitants from January 1999 to December 2010. Descriptive statistical and multivariate analysis, Fisher exact test and Chi-Square were utilized. p<0.05 was accepted as significant. RESULTS: 349 diagnoses of renal mass were reported; 165 of them were clear renal cell carcinoma. Median age was 70.41 years, and the Female/Male rate was 28% and 72%, respectively. 4% women and 30% men smoked ≥20 cigarettes/day, more frequently during the period 1999-2001. 52% women and 30% men had hypertension. Hematuria was the most frequent symptom (23%), more frequent in the period 2007-2010, followed by abdominal pain (16%) and renal colic(13%). Weight loss (12%) was more frequent between 1999-2000. Asthenia appeared as the first symptom in 8% of cases. The tumor was incidentally diagnosed in 20% of cases, more frequently in the period between 2007-2010. Diagnosis was established in the Urology Department in 36% of the cases. Stages T1-2 N0 were more frequent between 2007-2010, and M1 between 1999-2000. G3 was more frequent in the entire series. The relative cancer specific mortality of patients who were surgically treated was less in the last 2 years of the period. CONCLUSIONS: Clear renal cell carcinoma is the most frequent renal cancer and its incidence is increasing in our environment. It affects more frequently males than females, and at an earlier age. The last few years are showing a decrease in the habitual smoker males and an increase in HTN in females. A tendency has been detected to the early stage clinical diagnosis but with a higher histopathological grade. It is most frequent diagnosed by a non-Urology speciality.

Improvements in the Effectiveness of Early Detection in Colorectal Cancer with Open-Label Randomised Study.

INTRODUCTION: The general objective of this research is to improve the quality of colorectal cancer screening (CRC) by assessing, as an indicator of effectiveness, the ability of colonoscopy to detect more advanced adenomas in the exposed group than in the control group. MATERIAL AND METHODS: The present work is designed as an open-label randomized study on cancer screening, using two groups based on their exposure to the protocol: an exposed to intervention group (EIG, 167), and a control group (CG, 167), without the intervention of the protocol and by 1:1 matching. RESULTS: In 167 patients in the GEI, 449 polyps are visualized and 274 are adenomas (80.58%), of which 100 (36.49%) are advanced adenomas. In the CG (n = 174), there are 321 polyps and 152 adenomas (82.60%). The variables significantly associated by logistic regression to the detection of adenomas are the male sex with an OR of 2.52. The variable time to withdrawal, ≥9 min, is significant at 99% confidence (p = 0.002/OR 34.67) and the fractional dose is significant at 99% (p = 0.009, OR 7.81). CONCLUSION: Based on the observations made, our study suggests that the intervention in collaboration between primary care and hospital care is effective from a preventive point of view and achieves the objective of effectiveness and quality of the PCCR.

The influence of smoking on bacterial resistance after vaccine or antibiotic prophylaxis against recurrent urinary tract infections. / Influencia del tabaquismo en la resistencia bacteriana después de la profilaxis frente a infecciones urinarias recurrentes con antibiótico o con vacuna.

INTRODUCTION: The influence of tobacco on the microbiological spectrum, resistance-sensitivity pattern and evolution in patients with recurrent urinary tract infections (RUTI) is analyzed. Evaluation of the effect of polyvalent bacterial vaccine on the prevention of RUTI and smoking status. MATERIAL AND METHODS: Retrospective multicenter study of 855 women with RUTI receiving suppressive antibiotic treatment or bacterial vaccine between 2009 and 2013. Group A (GA): Antibiotic (n=495); Subgroups: GA1 non-smoker (n=417), GA2 smoker (n=78). Group B (GB): Vaccine (n=360); Subgroups: GB1 non-smoker (n=263), GB2 smoker (n=97). VARIABLES: Age, pre-treatment UTI, disease-free time (DFT), microbial species, sensitivity and resistance. Follow-up at 3, 6 and 12 months with culture and SF-36 questionnaire. RESULTS: Mean age 56.51 years (18-75), similar between groups (P=.2257). No difference in the number of pretreatment UTIs (P=.1329) or in the distribution of the bacterial spectrum (P=.7471). DFT was higher in subgroups B compared with A. Urine cultures in GA1: E. coli 62.71% with 8.10% resistance (33% quinolones; 33% cotrimoxazole; 33% quinolones + cotrimoxazole); in GA2 E. coli 61.53% with 75% resistance (16.66% quinolones; 33.33% quinolones + cotrimoxazole; 16.66% amoxicillin-clavulanate; 16.66% erythromycin + phosphomycin + clindamycin) (P=.0133). There were no differences between patients of GA treated with cotrimoxazole and nitrofurantoin (P=.8724). Urine cultures in GB1: E. coli 47.36% with 22.22% resistance (5.55% ciprofloxacin; 5.55% cotrimoxazole; 5.55% ciprofloxacin + cotrimoxazole; 5.55% amoxicillin/clavulanic acid). In GB2 E. coli 70.02% with 61.90% resistances (30.76% quinolones; 30.76% cotrimoxazole; 30.76% quinolones + cotrimoxazole; 17.69% amoxicillin-clavulanic acid) (P=.0144). CONCLUSIONS: The development of bacterial resistance is more frequent among women with smoking habits and recurrent urinary infections. This could influence a worse response to preventive treatments, either with antibiotics or vaccines.

Impact of organ confined prostate cancer treatment on quality of life. / Impacto en la calidad de vida del tratamiento del cáncer de próstata organoconfinado.

INTRODUCTION: Prostate cancer (PCa) is the second most common male cancer in the world. Its incidence is estimated to grow to 1.7 million new cases and 499,000 new deaths by 2030. Treatment of OCPC can affect patients physically and mentally, as well as their close relationships and their job or career, which conditions health-related quality of life (QoL). OBJECTIVE: Evaluate the impact on QoL attributable to the treatment for Organ Confined Prostate Cancer (OCPC). MATERIALS AND METHODS: Prospective multicenter observational study of 406 patients with OCPC treated from January 2015 to June 2018. The sample was divided into four study groups, according to the type of treatment: radical prostatectomy (RP) (GA), external radiotherapy (ERT) (GB), brachytherapy (BT) (GC) and other treatments different from monotherapy with RP, ERT or BT (GD). RESULTS: The age in GC was lower, the mean Prostate Specific Antigen (PSA) of all patients was 8.13 ng/ml, the group with the highest mean PSA was GB with a mean of 10.43 ng/dL, the mean Tumor Stage (TNM) was 3.82, and GD had the lowest post treatment quality of life. CONCLUSION: OCPC treatment affects QoL. Curative monotherapies, specifically RP and BT, have less effect on QoL than external radiotherapy or other therapeutic alternatives. Urinary incontinence and fistulas secondary to OCPC have the highest impact on QOL impairment. The internationally validated SF 36 questionnaire is a useful cross-sectional measure of QOL to compare the impact of OCPC treatment modalities.

Research of the impact of urinary infection teaching methods on the learning process. / Investigación de la repercusión en el proceso de aprendizaje según la metodología docente en la infección urinaria.

INTRODUCTION: The classical teaching methodology was based on passive transmission-based learning. The model has changed towards an orientation based on student-centred learning. OBJECTIVE: The objective of the study has been to evaluate the students' perception when learning about urinary tract infections, and their perspective about the teaching imparted on this pathology in the various subjects that include ITU in their syllabus. METHODS: A cross-sectional analytical study of the responses to an anonymous survey entitled: "Methodology on urine infections. Teaching aspects "issued by 228 students at their fifth year of Medical School, from two promotions. They referred to the following subjects: Pharmacy, Pathophisiology, Gynecology and Obstetrics, Infectious diseases, Microbiology, Nephrology, Pediatrics and Urology. RESULTS: The following variables have been analysed: teaching content, teaching basic aspects of the disease, consideration of teaching methodology and improvement suggestions. Descriptive and inferential statistics were used. CONCLUSION: The study has concluded that teaching urinary tract infection is perceived in specific subjects related to microorganism (Microbiology), the target organ (Infectious diseases, Urology), affected patients (Pediatrics, Gynecology and Obstetrics) rather than transversal subjects such as Pathophysiology or Pharmacy. The teaching methodology has been considered appropriate by more than 50% of the students in five from the 8 subjects that teach the concept of urinary tract infection. The students suggest convenient changes in current teaching methodology in several subjects that impart the urinary tract infection concept.

[Health-related quality of life in Spanish women with osteoporosis]. / Qualidade de vida relacionada à saúde em espanholas com osteoporose.

OBJECTIVE: To analyze the health-related quality of life in patients with osteoporosis and to compare it with the overall population. METHODS: A cross-sectional descriptive study was carried out with 60 female patients of the rheumatology service at a university hospital, in Spain, from April to October 2003. The Short Form-36 (SF-36) questionnaire was applied in order to obtain demographic data, clinical characteristics and data about lifestyles related to health. Patients were classified in age groups. The statistics tests performed were Chi-square, general linear model, Student's t-test. RESULTS: The interviewees' average age was 65.57 years old (SD: +/- 9.7 years), and average time interval for diagnosis was 3.4 +/- 2.84 years. The best scores were in social functioning (89), emotional aspects (72.2), mental health (63), and vitality (53.7). The lowest scores were in general health (45.1), physical capacity (47.7), pain (52.3) and physical aspects (59.9). The patients' average scores were lower than the general Spanish population's scores in the following dimensions: functional capacity, physical aspects, pain and overall health status. The greatest differences between the average SF-36 scores for patients and for the overall Spanish population were in the age group ranging from 55 to 64 years old. Scores were lower or similar to the general Spanish population in all other dimensions of the questionnaire. No significant associations were found between the dimensions of the SF-36 contemplated in this study and the clinical, demographic and lifestyle data. CONCLUSIONS: The patients presented bad quality of life, particularly with respect to those dimensions that are most relevant with respect to osteoporosis, when compared with the overall Spanish population. The physical dimensions were the ones most affected.

[Patient satisfaction as a quality indicator in mental health]. / Satisfacción del paciente como indicador de calidad en salud mental.

OBJECTIVE: To improve the quality of care in a Mental Health Hospital and identify the level of patient satisfaction. MATERIAL AND METHOD: A descriptive, longitudinal, and retrospective study was conducted on 666 patients who completed treatment in the Mental Health Day Hospital of Salamanca, during the period 1994-2012, using the Hospital Management Annual Reports. A questionnaire designed for this purpose was used as the measurement tool. RESULTS: Most of the patients satisfactorily valued aspects, such as the general impression of the treatment (90% said «good/fairly good¼) and perception of being helped (94% perceived «very/fairly helped¼); with 83% believing that the hospital is accessible. As regards empathy-understanding, it was noted that 14% feel discontent. While 18% of patients expected to be completely cured, the 83% of patients that finished their treatment have said that, in their opinion, the symptoms have subsided «very or somewhat¼. As regards the knowledge that they have about their disease, 30% believe it has advanced «a lot.¼ CONCLUSIONS: Based on the perceptions reported by patients, it may be said that in general, the level of user satisfaction in the Mental Health Day Hospital is high. Assessing quality through the user opinions helps control the quality, considering that patient satisfaction is a good indicator of result of the care received during their hospitalisation.

Severe complications and failures of incontinence surgery using the Remeex(®) adjustable tension sling (external mechanical regulator).

OBJECTIVES: Since 1999, we have performed implantations of Remeex® adjustable prosthetics as rescue treatment for complex or persistent stress urinary incontinence (SUI) after failure of other surgical treatments (Burch colposuspension, Marshall-Marchetti-Krantz (MMK) or tension-free transvaginal tape [TVT] until 2003 and transobturator tape [TOT] since 2003). We present the results of our series, which include cases with severe complications. MATERIAL AND METHOD: Retrospective study of women diagnosed with complex or refractory SUI who underwent Remeex(®) implantation between October 1999 and December 2013. In 5 cases, we conducted cystocele correction in the same operation as the placement of the Remeex(®). RESULTS: Sixty women, with a mean age of 66.87 years (range 39-85), underwent operations. The procedure was successful in 68.33% of the cases. The failures consisted of the following: 10% of the women had mixed urinary incontinence (UI) with multiple bladder diverticula; 8.33% had mild SUI; and 13.33% had urgency urination without UI. Thirty-five percent required adjustments. We recorded 3 cases with severe complications: disabling severe UI in a patient who underwent multiple operations, massive pelvic hemorrhage in a patient undergoing standard antiplatelet therapy and infected vaginal calculi measuring 7cm on an extruding Remeex thread in a paraplegic patient 4 years after the implantation. CONCLUSIONS: Remeex(®) is an effective and safe procedure for achieving continence in cases of complex or refractory SUI, although it is not exempt from severe complications. Following rigorous protocols can help detect complications and treat them in a timely manner.

[Epidemiological study and effect on antimicrobial use in the genus Acinetobacter in a university hospital]. / Estudio epidemiológico y efecto sobre la utilización de antimicrobianos en el genero Acinetobacter en un hospital universitario.

In recent years, bacteria of the genus Acinetobacter have gradually been gaining epidemiological importance. This is due to the fact that they have been emerging as opportunistic pathogens causing a great number of nosocomial infections, and due to their multiresistance to antimicrobial agents, which limits treatment options. This study aimed to determine the epidemiological importance of isolates of the genus Acinetobacter at the Clinical University Hospital of Salamanca, Spain. The identification and susceptibility of Acinetobacter was determined using the Pasco automated system for Gram-negative bacteria MIC/ID 6J. Clinical and epidemiological data were obtained from the clinical history. During the study period it was found that A. anitratus was the most frequently isolated species (56%). The origin of the bacteria was mainly nosocomial (70%), and it was most prevalent in the ICU.

[Efficacy of an informative seminar on the certification of causes of death]. / Eficacia de un seminario informativo en la certificación de causas de muerte.

BACKGROUND: Mortality statistics are of crucial importance in decision making from the point of view of Public Health Studies conducted on the reliability of such statistics have disclosed errors or biases, some of which may be avoided and/or reduced with information and training. The aim of the present work was to evaluate the efficacy of an informative seminar, received by pregraduate students, about the certification of causes of death in improving the formal quality of such statistics, thus increasing their reliability. METHODS: A total of 175 students in the 6th year of their medical studies participated voluntarily in the Seminar. The students first made 6 certifications of death by different causes, then received a theoretical session, and finally made a further 6 certifications of death in a new test. RESULTS: The results obtained point to an improvement in the set of indicators employed in the evaluation of the quality of the certifications of death. CONCLUSION: The informative seminar mode is proposed as a method to be used in the training of health personnel in mortality statistics.

Systematic review with meta-analysis: the I148M variant of patatin-like phospholipase domain-containing 3 gene (PNPLA3) is significantly associated with alcoholic liver cirrhosis.

BACKGROUND: Several studies have reported an association between alcoholic liver cirrhosis (ALC) or other forms of alcoholic liver disease (ALD) and the genetic variant rs738409 (C>G) in adiponutrin/patatin-like phospholipase domain-containing 3 gene (PNPLA3). AIM: To evaluate the influence of this variant on ALC and other forms of ALD. METHODS: We performed a systematic review of previous studies on the relationship between rs738409 of PNPLA3 and ALD and meta-analysis was conducted in a random-effects model. Calculations of the odds ratios (ORs) and their confidence intervals (CIs), tests for heterogeneity and sensitivity analyses were performed. RESULTS: Database search identified 11 previous studies available for inclusion with a total of 3495 patients with ALD (2087 with ALC) and 5038 controls (4007 healthy subjects and 1031 alcoholics without ALD). Patients with ALC compared to controls had a significantly higher prevalence of the G allele when comparing GG vs. CC (OR 4.30, 95% CI 3.25-5.69; P < 0.00001) or GC vs. CC genotypes (GC vs. CC: OR 1.91, 95% CI 1.67-2.17) or under a recessive or dominant model. Similar results were found when comparing separately patients with ALC vs. alcoholics without ALD or healthy subjects. An association of the G allele with ALD emerged when comparing ALD patients vs. alcoholics without ALD and/or healthy subjects although moderate to large heterogeneity was observed. Our data suggested an additive genetic model for this variant in ALD. CONCLUSION: Our meta-analysis shows that the rs738409 variant of PNPLA3 is clearly associated with alcoholic liver cirrhosis.

[Impact of short-stay units on the quality of medical care in Spain]. / Influencia de las unidades de corta estancia en la calidad de la atención hospitalaria en España. Revisión sistemática.

OBJECTIVE: Short-stay units (SSUs) have been developed as an alternative to conventional hospitalisation. The aim of this study is to analyse the impact of short-stay units on the quality of medical care in Spain. MATERIAL AND METHODS: A systematic review was performed by retrieving studies that analysed the results of SSUs in Spain, in terms of clinical effectiveness, efficiency and satisfaction among patients, using an electronic database search (Pubmed/Medline and Spanish Medical Index) and a review of selected references. The data collected included, mortality, length of stay and re-admission rates, as well as other variables. RESULTS: Twenty-seven articles were found, with a great heterogeneity in both study design and type of SSU analysed. After analysing results, it was observed that SSUs in Spain provided effective clinical care. Low-quality evidence was also found supporting the hypothesis that SSUs are able to reduce overall length of stay in the whole hospital or department where they were created. There are not enough data to support any other advantages or benefits of SSUs, when compared with other hospitalisation units. CONCLUSIONS: SSUs may be able to effectively improve clinical care in selected patients, and may help to shorten overall length of stay. Further research is needed in order to define their exact role and to establish their optimal model.

[Risk factors for failure after transobturator vaginal tape for urinary incontinence]. / Factores de riesgo de fracaso de la corrección quirúrgica de la incontinencia urinaria de esfuerzo mediante cinta suburetral transobturatriz.

OBJECTIVE: To identify risk factors leading to treatment failure in a sample of 302 women with stress urinary incontinence (SUI) treated by transobturator vaginal tape (TOT) with a medium follow-up of 4 years (range 1-6). MATERIAL AND METHODS: A population based cohort study with prospectively data from 302 women, aged 41-81 years underwent TOT between April 2003-November 2010. Data were collected by validated questionnaire on urinary incontinence, the International Consultation on Incontinence Questionnaire - Short Form (ICIQ-SF), and clinical data-records. Continence was achieved in 262 (Group A) and 40 continued with incontinence (Group B). We investigated the relationship between age, SUI evolution time, type and number of childbirths (eutocic, dystocic, nulliparous, multiparous status) and medical and/or surgical backgrounds. The ICIQ-SF questionnaire was used to describe whether the surgery outcomes were successful or not. RESULTS: Group A were younger (p=0.0001), had less SUI evolution time (p=0.017); more eutocic childbirths (p=0.000018). Group B had more dystocic childbirth (p=0.022), previous tension free vaginal tape (TVT) or TOT (p=0.03.), antidepressant-anxiolytic drugs (p=0.003), antihypertensive drugs (p=0.0005), type 1 diabetes (p=0.02), arterial hypertension (p=0.0007), respiratory diseases (p=0.025). Differences were not found with regard to nulliparous (p=0.701), multiparous status (p=0.42), obesity (p=0.18), intestinal disorders (p=0.59), oophorectomy (p=0.19), caesarean (p=0.17), prolapse surgery (p=0.29), hysterectomy (p=0.57), allergies (p=0.48), arthritis (p=0.22), arthrosis (p=0.44), depression (p=0.74), type 2 diabetes (p=0.44), smoking patterns (p=0.28), fibromyalgia (p=0.47). CONCLUSIONS: Elderly women, with long evolution SUI, dystocic delivery, previous TVT or TOT appear as independent risk factors associated to TOT failure. These factors may make the indication of another surgical approach recommendable.

Epidemiological study of Paget's disease of bone in a zone of the Province of Salamanca (Spain). The Paget's disease of the bone study group of Salamanca.

Bone Paget's disease is heterogeneously distributed and several foci of high prevalence have been reported in Spain. The aim of the present work was to determine the prevalence of the disease in a zone situated in the northwestern sector of the Province of Salamanca (Spain) using a cross sectional epi-demiological study. Sample choice was based on a stratified sampling according to the residence, age and sex of the inhabitants of the zone. A sampling error of 5% and a confidence level of 95% were considered; these afforded a sample of 378 units. Final choice of the subjects was based on a random pathway method. Data collection was accomplished with a personal interview using a 31-item questionnaire and analytical screening (AP and GGT). The field work was carried out over a one-year period. The data were input onto a calculation sheet for analysis and epidemiological interpretation. Finally, clinico-radiological confirmation of the cases deemed positive in the screening was accomplished. The prevalence of PBD in the zone studied is 5.7% (95% CI: 4.5-6.9). The highest percentage of patients lies within the age group between 70-79 years; most of these patients were women. The mean residence time in the zone was 66 years. According to the findings, this geographic zone has a high prevalence of PBD.

[Demand of microbiological diagnosis by pediatricians from the Salamanca area]. / Demanda de diagnóstico microbiológico por los pediatras del área de Salamanca.

OBJECTIVE: The purpose of this study was to assess the referrals made by pediatricians for microbiological diagnoses and to evaluate the process by determining the index of contaminated urine samples. PATIENTS AND METHODS: A transverse retrospective study was carried out on the referrals made to the microbiology laboratory of the University Hospital in Salamanca during 1997. The study was limited to the health area of Salamanca, which covers a population of 358,408 inhabitants. The data are distributed according to care levels and referral indicators (proportions and indices) are elaborated. RESULTS: The referrals and results of the 65,462 samples that were processed during this period were analyzed. Of the total, 10,120 (28%) were positive. The overall rate of pediatric referrals was 533 per 1,000 inhabitants. The highest demand was for serology, urinary and fecal studies. The rate of positive results in the different pediatric samples was 156/1000. The rate of results in urine was 154/1000. The rate of contaminated urine samples was 92/1000. CONCLUSIONS: The types of microbiological analyses in greatest demand are serology and urine cultures. The relationship between referrals and positive results is 4:1. The quality of the process can be improved through patient instruction and by means of suitable sample collection and transport.