Psycho-demographic profile in severe asthma and effect of emotional mood disorders and hyperventilation syndrome on quality of life.

BACKGROUND: Severe asthma affects a small population but carries a high psychopathological risk. Therefore, the psychodemographic profile of these patients is of interest. A substantial prevalence of anxiety, depression, alexithymia and hyperventilation syndrome in severe asthma is known, but contradictory results have been observed. These factors can also affect patients' quality of life. For this reasons, our purpose is to evaluate the psychodemographic profile of patients with severe asthma and assess the prevalence of anxiety, depression, alexithymia and hyperventilation syndrome and their impact on the quality of life of patients with severe asthma. METHODS: A cross-sectional study of 63 patients with severe asthma. Their psychodemographic profile was evaluated using the Hospital Anxiety and Depression Scale (HADS), Toronto Alexithymia Scale (TAS-20), Nijmegen questionnaire and Asthma Control Test (ACT) to determine the state of anxiety and depression, alexithymia, hyperventilation syndrome and control of asthma, respectively. Quality of life was assessed with the Mini Asthma Quality of Life Questionnaire (Mini-AQLQ). RESULTS: The mean age was 60 ± 13.6 years. Personal psychopathological histories were found in 65.1% of participants, and 8% reported previous suicidal attempts. The rate of anxiety and/or depression (HADS ≥ 11) was 68.3%. These patients present higher scores on the TAS-20 (p < 0.001) for the level of dyspnea (p = 0.021), and for emotional function (p = 0.017) on the Mini-AQLQ, compared with patients without anxiety or depression. Alexithymia (TAS-20 ≥ 61) was observed in 42.9% of patients; these patients were older (p = 0.037) and had a higher HADS score (p = 0.019) than patients with asthma without alexithymia. On the other hand, patients with hyperventilation syndrome (Nijmegen ≥ 23) scored higher on the HADS (p < 0.05), on the Mini-AQLQ (p = 0.002) and on the TAS-20 (p = 0.044) than the group without hyperventilation syndrome. Quality of life was related to anxiety-depression symptomatology (r = - 0.302; p = 0.016) and alexithymia (r = - 0.264; p = 0.036). Finally, the Mini-AQLQ total score was associated with the Nijmegen questionnaire total score (r = - 0.317; p = 0.011), and the activity limitation domain of the Mini-AQLQ correlated with the ACT total score (r = 0.288; p = 0.022). CONCLUSIONS: The rate of anxiety, depression, alexithymia and hyperventilation syndrome is high in patients with severe asthma. Each of these factors is associated with a poor quality of life.

Amiloidosis como causa de enfermedad pulmonar quística asociada a nódulos pulmonares / Amyloidosis as a Cause of Cystic Pulmonary Fibrosis Associated With Pulmonary Nodules

No disponible

Varón de 60 años de edad con enfermedad pulmonar obstructiva crónica y eosinofilia / A 60-Year-Old Male Smoker With Chronic Obstructive Pulmonary Disease and Hypereosinophilia

No disponible

Bronchiectasis in severe asthma: Clinical features and outcomes.

BACKGROUND: Bronchiectasis is increasingly being identified in patients with severe asthma and could contribute to disease severity. OBJECTIVE: To determine the prevalence of bronchiectasis in a population of patients with severe asthma and to better characterize the clinical features of these patients and their outcomes. METHODS: We retrospectively reviewed the medical files of 184 subjects with confirmed severe asthma who had undergone high-resolution thoracic computed tomography and compared the characteristics and outcomes of subjects with and without bronchiectasis. RESULTS: Bronchiectasis was identified in 86 patients (47%). These patients had concomitant hypersensitivity to nonsteroidal anti-inflammatory drugs (odds ratio [OR] 2.24, 95% confidence interval [CI] 1.00-5.03) and gastroesophageal reflux disease (OR 1.89, 95% CI 1.05-3.41) more frequently than subjects without bronchiectasis, but had less atopic dermatitis (OR 0.188, 95% CI 0.04-0.88). Subjects with bronchiectasis were more frequently hospitalized for asthma exacerbations (OR 2.09, 95% CI 1.08-4.05) and had higher blood eosinophil levels (464 vs 338; P = .005) than subjects without bronchiectasis. CONCLUSION: Our study suggests that in subjects with severe asthma, the presence of bronchiectasis is associated with more frequent hospitalizations, concomitant gastroesophageal reflux disease, hypersensitivity to nonsteroidal anti-inflammatory drugs, and higher blood eosinophil counts. Bronchiectasis could represent an additional phenotypic feature of severe eosinophilic asthma.

Dynamic hyperinflation in patients with asthma and exercise-induced bronchoconstriction.

BACKGROUND: Little is known about the behavior of operative lung volumes during exercise in patients with asthma and exercise-induced bronchoconstriction (EIB). OBJECTIVE: To compare the presence of dynamic hyperinflation (DH) in patients with mild asthma with and without EIB and in healthy individuals and to relate the changes in end-expiratory lung volume (EELV) with postexercise airflow reduction. METHODS: A total of 122 consecutive stable patients (>12 years of age) with mild asthma and 38 controls were studied. Baseline lung volumes were measured, and all patients performed an exercise bronchial challenge. At each minute of exercise, EELV and end-inspiratory lung volume (EILV) were estimated from inspiratory capacity measurements to align the tidal breathing flow-volume loops to within the maximal expiratory curve. RESULTS: DH was more frequent in patients with asthma and EIB (76%) than in patients with asthma but without EIB (11%) or controls (18%). The EELV increased in patients with asthma and EIB and decreased in patients with asthma without EIB and controls during exercise. In the patients with asthma, the decrease in forced expiratory volume in 1 second after the exercise challenge correlated with age (r = -0.179, P = .05), baseline forced vital capacity (r = 0.255, P = .005), EELV increase (r = 0.447, P < .001), and EILV increase (r = 0.246, P = .007). Age, baseline forced vital capacity, and magnitude of DH were retained as independent predictors of EIB intensity. CONCLUSION: In patients with asthma and EIB, the development of DH is very frequent and related to the intensity of postexercise bronchoconstriction. This finding could implicate DH in the development of EIB.

Systemic inflammation and higher perception of dyspnea mimicking asthma in obese subjects.

BACKGROUND: There are a variable number of obese subjects with self-reported diagnosis of asthma but without current or previous evidence of airflow limitation, bronchial reversibility, or airway hyperresponsiveness (misdiagnosed asthma). However, the mechanisms of asthma-like symptoms in obesity remain unclear. OBJECTIVES: We sought to evaluate the perception of dyspnea during bronchial challenge and exercise testing in obese patients with asthma and misdiagnosed asthma compared with obese control subjects to identify the mechanisms of asthma-like symptoms in obesity. METHODS: In a cross-sectional study we included obese subjects with asthma (n = 25), misdiagnosed asthma (n = 23), and no asthma or respiratory symptoms (n = 27). Spirometry, lung volumes, exhaled nitric oxide levels, and systemic biomarker levels were measured. Dyspnea scores during adenosine bronchial challenge and incremental exercise testing were obtained. RESULTS: During bronchial challenge, patients with asthma or misdiagnosed asthma reached a higher Borg-FEV1 slope than control subjects. Moreover, maximum dyspnea and the Borg-oxygen uptake (V'O2) slope were significantly greater during exercise in subjects with asthma or misdiagnosed asthma than in control subjects. The maximum dyspnea achieved during bronchial challenge correlated with IL-1ß levels, whereas peak respiratory frequency, ventilatory equivalent for CO2, and IL-6 and IL-1ß levels were independent predictors of the Borg-V'O2 slope during exercise (r(2) = 0.853, P < .001). CONCLUSIONS: A false diagnosis of asthma (misdiagnosed asthma) in obese subjects is attributable to an increased perception of dyspnea, which, during exercise, is mainly associated with systemic inflammation and excessive ventilation for metabolic demands.

Oxygenation With a Single Portable Pulse-Dose Oxygen-Conserving Device and Combined Stationary and Portable Oxygen Delivery Devices in Subjects With COPD.

BACKGROUND: Portable oxygen devices simplify and facilitate patient therapy. This study was designed to compare S(pO2) and patient satisfaction with a portable oxygen concentrator or a combined system consisting of a fixed device with continuous-flow oxygen dispensation and a portable device with pulse dispensation for ambulation. METHODS: This crossover trial assessed 25 subjects with COPD (92% men, mean age of 72.2 ± 7.4 y, mean FEV1 of 34.14 ± 12.51% of predicted) at 4 hospitals in Madrid. All subjects had previously used the combined system, consisting of a fixed oxygenation system and a portable system for ambulation, with 16 (64%) using stationary and portable concentrators and 9 (36%) using a stationary reservoir and portable liquid oxygen bag. Oxygenation settings at rest and while walking were determined at baseline. Subjects were maintained on the previous combined system for 1 week and then switched to the portable oxygen concentrator for 1 week. Mean S(pO2) over 24 h was calculated using the software in the oximeter, and compliance was monitored (Visionox). RESULTS: Low S(pO2) (< 90%) was significantly more frequent during use of the portable concentrator alone than with the combined system (37.1% vs 18.4%, P < .05). The portable system alone was preferred by 43% of subjects, and the combined system was preferred by 36%, whereas 21% were not sure. CONCLUSIONS: Subjects preferred using a single portable oxygenation system both at home and during ambulation. Portable systems alone, however, did not supply the same levels of oxygenation as the combination of fixed and portable systems. Before the widespread adoption of portable systems as a single device, additional studies are needed to determine best-practice protocols for adjustment of daytime and nighttime oxygenation settings. (ClinicalTrials.gov registration NCT02079753).

Estudio del ácido úrico en pacientes con apnea del sueño y su posible interés como marcador de hipoxia intermitente / No disponible

Objetivo: En el síndrome de apneas-hipopneas del sueño (SAHS) se produce hipoxia intermitente que aumenta el catabolismo del adenosín trifosfato hacia la formación de ácido úrico (AU). El objetivo de este estudio fue investigar la asociación de la apnea del sueño con la uricemia y determinar si los valores de ácido úrico (AU) y la relación ácido úrico/creatinina (AU/Cr) séricos varían en función de la gravedad del SAHS. Material y métodos: Se incluyeron 96 pacientes consecutivos con sospecha de SAHS a los que se les realizó medida de parámetros antropométricos, determinación de AU y creatinina plasmáticos y estudio de sueño (poligrafía respiratoria o polisomnografía). Resultados: Al comparar individuos con y sin SAHS se observaron mayores valores de AU (p<0,002) y del ratio AU/Cr (p<0,001) en el grupo con SAHS. La uricemia y la ratio AU/Cr mostraron una relación directa con el índice de masa corporal, el perímetro del cuello, el índice de apnea-hipopnea (IAH) y el índice de desaturación (ID), y correlación negativa con la saturación media y mínimas nocturnas de oxígeno. Estratificando a los pacientes en tres grupos según el valor de su IAH: 1) menor de 5 h-1 2) entre 5 y 30 h-1 3) superior a 30 h-1, observamos diferencias significativas para los valores del AU entre los grupos 1 y 3 (p<0,027) y entre los grupos 2 y 3 (p<0,028) y para el ratio AU/Cr entre los grupos 1 y 3 (p<0,015). Conclusión: Los pacientes con SAHS tienen valores plasmáticos de AU y de la ratio AU/Cr más elevados que los que no tienen SAHS y los niveles de AU y ratio AU/Cr aumentan con la severidad de la enfermedad. Estos resultados nos plantean su posible utilidad como marcadores de hipoxia intermitente(AU)

Objective: Sleep apnea-hypopnea syndrome (SAHS) causes intermittent hypoxia that increases adenosine triphosphate catabolism leading to uric acid (UA) formation. The goal of this study was to research on the link between sleep apnea and uricemia and to determine if uric acid (UA) values and the serum creatinine and uric acid (UA/Cr) ratio vary depending on SAHS severity. Material and methods: 96 consecutive patients who were suspected of having SAHS were included. Anthropometric measures were taken, UA and creatinine in plasma was established and a sleep study (respiratory polygraphy or polysomnography) was performed. Results: When comparing individuals with and without SAHS, greater UA values (p<0,002) and AU/Cr (p<0,001) ratio levels were observed for SAHS patient group. Uricemia and UA/Cr ratio showed direct relationship with body mass index, neck perimeter, apnea-hypopnea index (AHI) and desaturation index (DI). It showed negative correlation with oxygen average saturation and nocturnal minimal values. Patients were stratified in three groups according to their AHI: 1) under 5 h-1 2) between 5 and 30 h-1 3) over 30 h-1. For UA values, we observed significant differences between groups 1 and 3 (p<0,027) and between groups 2 and 3 (p<0,028); and for ratio AU/Cr, between groups 1 and 3 (p<0,015). Conclusion: SAHS patients show higher UA plasma values and UA/Cr ratio levels than those patients who don’t have SAHS. Moreover, UA values and UA/Cr ratio levels increase with the disease severity. These results prove useful as intermittent hypoxia markers(AU)

Implicación de los servicios de neumología españoles en la asistencia, docencia e investigación en asma. Resultados de la encuesta ATENEA / Involvement of Spanish Pulmonology Centers in Patient Care, Postgraduate Education and Research in Asthma: The Results of the ATENEA Survey

Si bien el asma es una de las enfermedades respiratorias crónicas más prevalentes, existe la sospecha de que la participación de los centros de neumología españoles en su manejo es potencialmente mejorable. Objetivo: Determinar el grado de implicación de los servicios de neumología españoles en la asistencia, docencia e investigación relacionadas con la enfermedad asmática y específicamente con la de control difícil. Método: Se remitió una encuesta formada por 75 ítems que cumplimentaron los responsables de los centros entrevistados. La encuesta interrogaba sobre la asistencia neumológica general y la del asma en particular, así como la actividad docente e investigadora en la enfermedad asmática en los cinco años previos. Resultados: De las 107 encuestas enviadas, 69 (64,5%) centros las retornaron cumplimentadas. De estos, 47 (68,1%) reunieron criterios de actividad asistencial destacada en asma. Sin embargo, solo 29 (42%) disponían de una consulta monográfica de asma de control difícil y 37 (53,6%) utilizaban un programa de educación. En el ámbito docente, únicamente 31 (44,9%) proporcionaban formación específica sobre asma a sus médicos residentes. Y en el de investigación, 12 (17,4%) referían tener proyectos subvencionados por SEPAR y 25 (36,2%) habían publicado trabajos en revistas con factor de impacto. Conclusiones: Si bien la mayoría de los centros neumológicos entrevistados refieren una notable actividad en la asistencia del asma, su implicación en el abordaje especializado del asma de control difícil es insuficiente. Así mismo, su participación en actividades docentes y de investigación relacionadas con la enfermedad es desigual y limitada a escasos centros(AU)

Although asthma is one of the most prevalent chronic respiratory diseases, the participation of Spanish pulmonology units in the management of asthma may have room for improvement. Objective: To determine the degree of involvement of the Spanish pulmonology services in the patient care, education and research related with asthma disease and especially in difficult-to-control asthma. Methods: A survey made up of 75 questions was sent to the heads of several pulmonology departments. The survey asked questions pertaining to respiratory disease care in general, and in asthma in particular, as well as the educational activities and research in asthma during the previous five years. Results: Out of the 107 surveys sent, 69 (645%) centers filled them out and returned them. Forty-seven (681%) met the criteria for an important level of health-care activity in asthma. However, only 29 (42%) had a monographic consultation for difficult-to-control asthma and 37 (536%) used an education program. As for postgraduate education, only 31 (449%) provided their resident physicians with specific asthma training. And in the research field, 12 (174%) reported having projects funded by SEPAR and 25 (362%) had published studies in journals with an impact factor. Conclusions: Although the majority of the pulmonology centers interviewed report a notable activity in asthma patient care, their involvement in the specialized approach for difficult-to-control asthma is insufficient. Likewise, participation in educational activities and research related with the disease is inconsistent and limited to few centers(AU)

Involvement of Spanish pulmonology centers in patient care, postgraduate education and research in asthma: the results of the ATENEA survey.

UNLABELLED: Although asthma is one of the most prevalent chronic respiratory diseases, the participation of Spanish pulmonology units in the management of asthma may have room for improvement. OBJECTIVE: To determine the degree of involvement of the Spanish pulmonology services in the patient care, education and research related with asthma disease and especially in difficult-to-control asthma. METHODS: A survey made up of 75 questions was sent to the heads of several pulmonology departments. The survey asked questions pertaining to respiratory disease care in general, and in asthma in particular, as well as the educational activities and research in asthma during the previous five years. RESULTS: Out of the 107 surveys sent, 69 (645%) centers filled them out and returned them. Forty-seven (681%) met the criteria for an important level of health-care activity in asthma. However, only 29 (42%) had a monographic consultation for difficult-to-control asthma and 37 (536%) used an education program. As for postgraduate education, only 31 (449%) provided their resident physicians with specific asthma training. And in the research field, 12 (174%) reported having projects funded by SEPAR and 25 (362%) had published studies in journals with an impact factor. CONCLUSIONS: Although the majority of the pulmonology centers interviewed report a notable activity in asthma patient care, their involvement in the specialized approach for difficult-to-control asthma is insufficient. Likewise, participation in educational activities and research related with the disease is inconsistent and limited to few centers.

Prognostic value of the objective measurement of daily physical activity in patients with COPD.

BACKGROUND: Subjective measurement of physical activity using questionnaires has prognostic value in COPD. However, their lack of accuracy and large individual variability limit their use for evaluation on an individual basis. We evaluated the capacity of the objective measurement of daily physical activity in patients with COPD using accelerometers to estimate their prognostic value. METHODS: In 173 consecutive subjects with moderate to very severe COPD, daily physical activity was measured using a triaxial accelerometer providing a mean of 1-min movement epochs as vector magnitude units (VMUs). Patients were evaluated by lung function testing and 6-min walk, incremental exercise, and constant work rate tests. Patients were followed for 5 to 8 years, and the end points were all-cause mortality, hospitalization for COPD exacerbation, and annual declining FEV(1). RESULTS: After adjusting for relevant confounders, a high VMU decreased the mortality risk (adjusted hazard ratio [HR], 0.986; 95% CI, 0.981-0.992), and in a multivariate model, comorbidity, endurance time, and VMU were retained as independent predictors of mortality. The time until first admission due to COPD exacerbation was shorter for the patients with lower levels of VMU (adjusted HR, 0.989; 95% CI, 0.983-0.995). Moreover, patients with higher VMU had a lower hospitalization risk than those with a low VMU (adjusted incidence rate ratio, 0.099; 95% CI, 0.033-0.293). In contrast, VMU was not identified as an independent predictor of the annual FEV(1) decline. CONCLUSION: The objective measurement of the daily physical activity in patients with COPD using an accelerometer constitutes an independent prognostic factor for mortality and hospitalization due to severe exacerbation.

Bronchial reactivity indices are determinants of health-related quality of life in patients with stable asthma.

BACKGROUND: A very weak relationship has been reported between the health-related quality of life (HRQL) of patients with asthma and their degree of airway hyper-responsiveness (AHR), evaluated in terms of sensitivity. However, this relationship still has not been sufficiently explored for bronchial reactivity indices. OBJECTIVES: To analyse the relationship between bronchial reactivity and sensitivity with the HRQL of patients with stable asthma, identifying the functional parameters that determine HRQL. METHODS: In 103 consecutive patients with stable asthma, HRQL was evaluated using the Asthma Quality of Life Questionnaire (AQLQ). Patients underwent spirometry and non-specific bronchial provocation with methacoline. Sensitivity (PD(20)) and reactivity (dose-response slope (DRS), continuous index of responsiveness (CIR) and bronchial reactivity index (BRI)) of the dose-response curve were analysed. RESULTS: BRI presented significant differences with different degrees of asthma severity. Although patients with AHR showed poorer quality of life than patients without AHR, the AQLQ total score was not related to PD(20) but rather to DRS (r=-0.784), CIR (r=-0.712) and BRI (r=-0.776). The indices of bronchial reactivity reached a negative correlation with all the domains of the AQLQ. In a multiple linear regression model, BRI, DRS, FIV(1) (forced inspiratory volume in 1 s) and VCIN (inspiratory vital capacity) were identified as independent predictors of the AQLQ total score (r(2)=0.742, p<0.001). CONCLUSION: In patients with stable asthma, bronchial reactivity is associated with HRQL. This could justify incorporating bronchial reactivity indices in bronchial provocation analyses.

Lung volume reference values for women and men 65 to 85 years of age.

RATIONALE: In elderly subjects, static lung volumes are interpreted using prediction equations derived from primarily younger adult populations. OBJECTIVES: To provide reference equations for static lung volumes for European adults 65 to 85 years of age and to compare the predicted values of this sample with those from other studies including middle-aged adults. We compare the lung volumes by plethysmography and helium dilution in elderly subjects. METHODS: Reference equations were derived from a randomly selected sample from the general population of 321 healthy never-smoker subjects 65 to 85 years of age. Spirometry and lung volume determinations by plethysmography and multibreath helium equilibration method were performed following the American Thoracic Society/European Respiratory Society recommendations. Reference values and lower and upper limits of normal were derived using a piecewise polynomial model. MEASUREMENTS AND MAIN RESULTS: Plethysmography provided higher values than the dilutional method for all lung volumes, with wide limits of agreement. In addition to height, our reference equations confirm the age- and body size dependence of lung volumes in older subjects. Practically all the estimations performed by extrapolating reference equations of middle-aged adults overpredicted the true lung volumes of our healthy elderly volunteers. Middle-aged reference equations classify subjects as being below the total lung capacity lower limit of normal between 17.9 and 62.5% of the women and between 12.5 and 42.2% of the men of the current study. CONCLUSIONS: These results underscore the importance of using prediction equations appropriate to the origin, age, and height characteristics of the subjects being studied.

Characteristics of a population of COPD patients identified from a population-based study. Focus on previous diagnosis and never smokers.

OBJECTIVE: To identify factors associated with diagnosis and health-related quality of life (HRQL) impairment in chronic obstructive pulmonary disease (COPD) patients from a population-based epidemiological study. DESIGN AND PARTICIPANTS: This was an epidemiologic, multicenter, population-based study. Three hundred and sixty-three individuals diagnosed with COPD from a randomly general population sample of 4035 individuals aged 40-69 were included in the analyses. INTERVENTIONS: Forced spirometry was performed on eligible subjects, and the European Commission for Steel and Coal (ECSC) and the St. George's Respiratory Questionnaires (SGRQ) were completed. Logistic regression models were constructed to identify variables associated with the previous diagnosis of COPD and with COPD in never smokers. A multiple linear regression model attempted to identify variables influencing HRQL impairment. RESULTS: Only 79 (21.7%) COPD patients had been previously diagnosed. Disease severity based on FEV(1), worse SGRQ score, previous respiratory disease, as well as the presence of wheezing were significantly associated with previous diagnosis. Being a woman, older than 55, with previous respiratory disease and without expectoration or wheezing characterized COPD in never smokers. A worse HRQL was associated with chronic symptoms, especially dyspnea; and with older age, cardiac comorbidity and impairment in lung function. CONCLUSIONS: Diagnosis of COPD in the community is more likely in patients with worse lung function and HRQL, and wheezing is the symptom most strongly associated with a diagnosis of COPD. Women older than 55, with previous respiratory diseases, without respiratory symptoms and mild airflow obstruction constitute the majority of individuals with COPD who have never smoked. Chronic respiratory symptoms are strongly associated with impairment in HRQL.

Can cumulative tobacco consumption, FTND score, and carbon monoxide concentration in expired air be predictors of chronic obstructive pulmonary disease?

Between 15% and 20% of smokers develop chronic obstructive pulmonary disease (COPD). The aim of the present study was to determine which characteristics of smoking, particularly the Fagerström Test for Nicotine Dependence (FTND) score, were associated with the risk of developing COPD. Data from the IBERPOC epidemiological study were analyzed. IBERPOC was a multicenter epidemiological study including 4035 individuals aged 40-69 years, 1023 (25%) of whom were active smokers. We analyzed the association between smoking characteristics--such as the cumulative consumption of tobacco, FTND score, and expired-air carbon monoxide levels--and the diagnosis of COPD. Among the smokers, 153 (15%) were diagnosed with COPD. A cumulative tobacco consumption of more than 30 pack-years (OR=4.24, 95% CI=2.83-6.36) and the FTND score (OR=1.11, 95% CI=1.02-1.21, for each point increase) were significantly associated with the diagnosis of COPD in the model obtained by logistic regression analysis with the full sample of smokers. Cumulative consumption of tobacco was associated with the diagnosis of COPD. For each point increase in the FTND score, the probability of a smoker developing COPD increased by 11%.

Factores que determinan la viscosidad sanguínea del recién nacido sano

La viscosidad es una importante propiedad física de los líquidos y como tal de la sangre; de la cual dependen el flujo y transporte de nutrientes a los órganos nobles de la economía. Es conocido en neonatología la presencia del síndrome policitémico con una frecuencia de 1-5 por ciento, el cual se asocia en un 80 por ciento de los casos con hiperviscosidad llegando a considerarlo algunos autores como el síndrome policitémico-hiperviscoso. Este síndrome lleva a una disminución en la velocidad de flujo de la sangre sobre todo a nivel de capilares lo que puede llevar a isquemia de órganos nobles como el cerebro, desprendiéndose de esto sus consecuencias. El propósito de éste trabajo fue determinar la magnitud de la influencia individual de las variables hematológicas (hemoglobina, hematocrito, recuento de hematíes, VCM)k, bioquímicas (proteínas totales y fraccionadas, fibrinógeno) y biológicas (peso, presión arterial y tiempo de pinzamiento) sobre la viscosidad sanguínea de 40 recién nacidos sanos en el H.R.H.D. de Arequipa. Además se completó el estudio realizando un análisis de regresión múltiple para evaluar el conjunto de las variables estudiadas sobre viscosidad. Se concluyó que hematocrito, albúmina y peso son los componentes de las variables hematológicas, bioquímicas y biológicas respectivamente que mayor efecto individual ejercen sobre viscosidad. Al analizar las variables en conjunto se concluyó que las asociaciones de hematocrito y proteínas totales o hematocrito, hemoglobina y peso son las que mejor expresan el efecto del conjunto de variables sobre viscosidad, en base a éstas se estableció ecuaciones que pueden ser aplicadas como predictoras de esta importante propiedad física de la sangre.