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1.
Chinese Journal of Hospital Administration ; (12): 327-331, 2022.
Article in Chinese | WPRIM | ID: wpr-958783

ABSTRACT

Promoting balanced distribution of medical resources and realizing high-quality sharing of basic medical services between urban and rural areas are an important part of common prosperity. Huzhou urban medical alliance was a new urban and rural of medical alliance mode based on level 4 vertical integration, which played an important role in the whole evolution process of the medical alliance. This medical alliance had not only broken through the " integration of counties" but also explored the " integration of cities" . It was a bridge connecting counties and cities, which was of great significance in narrowing the gap between urban and rural medical health services. The construction of urban medical alliance took digital transformation and systematic integration as two breakthroughs to comprehensively promote the upgrade of energy efficiency and benefit stacking of health governance. In 2021, the grass-roots medical utilization rate and county-level medical utilization rate were 72.7% and 90.6%. In 2020, the average hospitalization cost(8 726.7 yuan)and the average outpatient and emergency expenses(239.6 yuan)of public hospitals were 25.0% and 8.6% lower than the average level of Zhejiang Province, respectively. Although Huzhou city had broken through the restrictions of administrative divisions and actively promoted the construction of the medical alliance, and achieved phased results, there were still structural defects and institutional difficulties. In order to solve these problems, the author proposed to promote the improvement of governance structure and optimization of governance system through " three governance" and " three characteristics" , and then promote the high-quality development of urban medical alliances.

2.
Chinese Journal of Medical Aesthetics and Cosmetology ; (6): 115-118, 2018.
Article in Chinese | WPRIM | ID: wpr-712358

ABSTRACT

Objective To explore the surgical procedures of reduction and lifting mammaplasty with the short vertical scar and breast lateral fibrous septum vascular pedicle to improve the clinical effect and reduce the complications.Methods Sixty-four patients underwent reduction and lifting mammaplasty:a incision around the areola and under the breast,using the breast lateral fibrous septum vascular pedicle and medial superior dermal pedicle to ensure the blood supply of the nipple.The skin and glands of the lower part of the breast were resected with suspension;upper part was lifting,with skin shaping and sutured.Results There were no postoperative complications such as hematoma,infection,skin and nipple areolar necrosis.The breasts were tall,plump and symmetry with little scar.Conclusions The breast reduction and lifting mammaplasty with breast lateral fibrous septum vascular pedicle and verical incision is effective in the treatment of macromastia and ptosis breast;breast form is satisfied and the complication is less;the operation is simple,safe,effective and worth promoting.

3.
Chinese Journal of Medical Library and Information Science ; (12): 1-6, 2017.
Article in Chinese | WPRIM | ID: wpr-712427

ABSTRACT

Objective To study the association between users behaviors and information narrowing and the effect of in-formation narrowing on the access of information under the micro-dissemination environment.Methods The presence of in-formation narrowing and the reasons why it occurs were analyzed by literature analysis, the perception of its users was analyzed according to the questionnaire survey,and the data recorded during the questionnaire survey were ana-lyzed by ordinal logistic regression analysis using the SPSS 21.0.Results Five variables displayed in ordinal logistic regression analysis showed their significant effect on information narrowing.Conclusion Information narrowing can affect our understanding of information and lead to the spread of false information and rumors. Information users should thus expand their knowledge structure and information access channels,strengthen Internet management and take a lead in the healthy development of network information dissemination.

4.
Journal of the Korean Ophthalmological Society ; : 1242-1247, 2017.
Article in Korean | WPRIM | ID: wpr-74537

ABSTRACT

PURPOSE: To investigate the correlation between 24-hour ambulatory blood pressure (BP) monitoring and peripapillary retinal vessel width and visual field (VF) defect progression in normal tension glaucoma (NTG) patients. METHODS: All patients were classified by 24-hour ambulatory BP monitoring as non-dipper (nocturnal dip < 10%) and dipper (nocturnal dip ≥ 10%) group. Vessel diameter, mean deviation (MD) value by VF test and VF progression from Glaucoma Progression Analysis (GPA) were compared among non-dipper and dipper groups. RESULTS: Retinal arterial diameter was wider in the non-dipper group compared to the dipper group (p = 0.015), while retinal venous diameter had no significant relationship between the two groups (p = 0.131). The MD value at baseline and 2 years after was worse in the non-dipper group than the dipper group, respectively (p = 0.006, p = 0.030). But, there was no significant relationship between nocturnal dip and GPA progression (p = 0.658). CONCLUSIONS: There was a statistically significant correlation between nocturnal dips and retinal arterial diameter and MD values. These results suggest that non-invasive fundus photography can predict hemodynamic features like nocturnal dip.


Subject(s)
Humans , Blood Pressure , Glaucoma , Hemodynamics , Low Tension Glaucoma , Photography , Retinal Vessels , Retinaldehyde , Visual Fields
5.
Journal of Medical Biomechanics ; (6): E347-E355, 2016.
Article in Chinese | WPRIM | ID: wpr-804082

ABSTRACT

Although it is important to explore potential treatment of chronic obstructive airway diseases such as asthma, as well as to discover interesting biophysical phenomena in airway system, the research on biomechanical models of airway narrowing remains a both appealing and challenging field. However, there have been significant advances during recent years, with number of emerging new models and new approaches. This review article briefly introduces some of the most recent work published in the literature. In particular, those work that emphasize on asthmatic airway narrowing behavior, and strive to explain the corresponding in vivo airway behaviors. More specifically, models that discuss not only individual airway behaviors, but also interactions due to coupling between airways and their surrounding structures are focused on. This includes interesting phenomena involving the airways and the smooth muscle that surrounds the airways, as well as the emergent spatial ventilation patterns due to dynamic airway interaction.

6.
Article in English | IMSEAR | ID: sea-159312

ABSTRACT

Atrophic Rhinitis is a form of chronic rhinitis in which the nasal mucosa atrophies and hardens; eventually causing the nasal passages to dilate and dry out. Other prominent findings include foul smelling crusts and bleeding. Despite various local, medical and surgical methods suggested for the treatment of this slowly progressing disease, the problem with respect to the proper maintenance of the nasal valve area remains unsolved. The alar stent prevents the narrowing of the nostrils and helps in maintaining the airway patency. This article describes a simplified, non-invasive technique for the fabrication of a heat polymerized clear acrylic resin alar stent for treating the atrophic rhinitis patient.


Subject(s)
Acrylic Resins , Female , Humans , Middle Aged , Nasal Obstruction/prevention & control , Prostheses and Implants , Rhinitis, Atrophic/complications , Rhinitis, Atrophic/rehabilitation , Rhinitis, Atrophic/therapy , Stents
7.
Korean Journal of Anesthesiology ; : 456-459, 2013.
Article in English | WPRIM | ID: wpr-227432

ABSTRACT

Unexpected tracheal narrowing was observed in a patient with Duchenne muscular dystrophy during a corrective operation for thoracolumbar scoliosis. As the operating time progressed, peak airway pressure and end-tidal CO2 increased gradually in the prone position. We found a floppy portion of the trachea using fiberoptic bronchoscopy (FB) in the prone position. We advanced a wire-reinforced tube toward the carina beyond the lesion. This allowed correction of the ventilatory abnormalities. We encountered another patient scheduled for the same operation. We performed FB in advance before the position change and observed a narrowed portion of trachea. We advanced the tracheal tube under FB beyond the pathologic portion and then moved the patient into the prone position. The operation was done successfully without any problems.


Subject(s)
Humans , Anesthesia, General , Bronchoscopy , Muscular Dystrophy, Duchenne , Prone Position , Scoliosis , Trachea
8.
Medicina (B.Aires) ; 70(4): 321-327, ago. 2010. tab
Article in English | LILACS | ID: lil-633760

ABSTRACT

During bronchoconstriction women perceive more breathlessness than men. The aims of study were 1) to evaluate if quality of dyspnea in bronchoconstriction was different in women and men 2) to assess if gender difference in the perception of dyspnea could be related to the level of bronchoconstriction. 457 subjects (257 women) inhaled methacholine to a 20% decrease in FEV1, or 32 mg/ml. Dyspnea was evaluated using the modified Borg scale and a list of expressions of dyspnea. Borg scores were recorded immediately before the challenge test baseline and at the maximum FEV1 decrease. The prevalence of descriptors of dyspnea reported by women and men was similar. Dyspnea was related to the level of FEV1 (ΔFEV1: OR 1.05, 95%CI 1.01-1.09, p 0.0095), females (OR 2.90, 95%CI 1.33-6.33, p 0.0072), younger subjects (OR 0.93, 95%CI 0.89- 0.97, p 0.0013) and body mass index (BMI) (OR 1.11, 95%CI 1.01-1.23, p 0.023). As the FEV1 fell less than 20% from baseline, only the ΔFEV1 was significantly associated with dyspnea (ΔFEV1:OR 1.15, 95%CI 1.07- 1.24, p 0.0002). Instead, if the FEV1 fell higher ≥ 20%, the presence of dyspnea was related to the degree of bronchoconstriction (ΔFEV1: OR 1.04, 95%CI 1.01-1.09, p 0.0187), females (OR 3.02, 95%CI 1.36-6.72, p 0.0067), younger subjects (OR 0.92, 95%CI 0.88-0.96, p 0.0007) and BMI (OR 1.12, 95%CI 1.01-1.23, p 0.023). The quality of dyspnea during the bronchoconstriction was similar in women and men; women showed a higher perception of dyspnea than men only when the FEV1 fell more than 20% from baseline.


Durante la broncoconstricción las mujeres perciben más disnea que los hombres. Los objetivos del estudio fueron evaluar: 1) si la calidad de la disnea durante la broncoconstricción fue diferente en mujeres y hombres, 2) si la diferencia entre sexos en la percepción de disnea podría relacionarse al nivel de broncoconstricción. 457 sujetos (257 mujeres) inhalaron metacolina hasta un descenso del FEV1 ≥ 20% o 32 mg/ml. La disnea fue evaluada mediante escala de Borg y una lista de expresiones de disnea. El Borg fue registrado en forma basal y con el máximo descenso del FEV1. La frecuencia de descriptores de disnea informados por mujeres y hombres fue similar. La disnea estuvo relacionada al grado de broncoconstricción (ΔFEV1: OR 1.05, 95%CI 1.01-1.09, p 0.0095), sexo femenino (OR 2.90, 95%CI 1.33-6.33, p 0.0072), edad (OR 0.93, 95%CI 0.89-0.97, p0.0013) e índice de masa corporal (IMC) (OR 1.11, 95%CI 1.01-1.23, p 0.023). Cuando el FEV1 cayó menos del 20%, solo el ΔFEV1 se asoció con disnea (ΔFEV1: OR 1.15, 95%CI 1.07-1.24, p 0.0002). En tanto que si el FEV1 cayó ≥ del 20%, la disnea estuvo relacionada al grado de broncoconstricción (ΔFEV1: OR 1.04, 95%CI 1.01-1.09, p 0.0187), sexo femenino (OR 3.02, 95%CI 1.36-6.72, p 0.0067), edad (OR 0.92, 95%CI 0.88-0.96, p 0.0007) e IMC (OR 1.12, 95%CI 1.01-1.23, p 0.023). La calidad de la disnea durante la broncoconstricción fue similar en hombres y mujeres; las mujeres tuvieron mayor percepción de disnea que los hombres solo cuando el FEV1 descendió más del 20%.


Subject(s)
Adult , Female , Humans , Male , Bronchoconstriction/drug effects , Bronchoconstrictor Agents/pharmacology , Dyspnea/psychology , Forced Expiratory Volume/drug effects , Methacholine Chloride/pharmacology , Sex Factors , Perception , Quality of Life
9.
Journal of Korean Society of Medical Informatics ; : 483-492, 2009.
Article in Korean | WPRIM | ID: wpr-204165

ABSTRACT

OBJECTIVE: This study was conducted to measure radiographic joint space width and to estimate erosion in the hands of patients with rheumatoid arthritis. It showed that joint space width, homogeneity, and invariant moments are parameters to discriminate between the normal and the rheumatoid joint. METHODS: In order to measure the joint space width and to estimate erosion in the finger joint, 32 radiographic images were used - 16 images for training and 16 images for testing. The joint space width was measured in order to quantify the joint space narrowing. Also, homogeneity and invariant moments was computed in order to quantify erosion. Finally, artificial neural networks were constructed and tested as a classifier distinguishing between the normal and the rheumatoid joint. RESULTS: The joint space width of normal was 1.04+/-0.15 mm and the width of patients with rheumatoid arthritis was 0.94+/-0.15 mm. The Homogeneity of normal was 16568.83+/-2669.83 and invariant moments were 6843.45+/-2937.55. They were statistically difference (p<.05). Using these characteristics, artificial neural networks showed that they discriminate between normal and rheumatoid arthritis (AUC=0.91). CONCLUSION: Measuring joint space width, estimating homogeneity, and invariant moments provide the capability to distinguish between a normal joint and a rheumatoid joint.


Subject(s)
Humans , Arthritis, Rheumatoid , Finger Joint , Hand , Joints
10.
Rev. colomb. reumatol ; 13(3): 214-227, jul.-sep. 2006. ilus
Article in Spanish | LILACS | ID: lil-636738

ABSTRACT

En este artículo revisamos los diferentes métodos de evaluación radiográfica del daño anatómico producido por la artritis reumatoide; sus ventajas y limitaciones, así como las principales características.


In this article we reviewed the different radiologic methods of evaluation of the anatomical damage produced by rheumatoid arthritis; its advantages and limitations, as well as the main characteristics.


Subject(s)
Humans , Arthritis, Rheumatoid , Radiography , Anatomy , Signs and Symptoms , Evaluation Studies as Topic , Methods
11.
Journal of the Korean Ophthalmological Society ; : 67-75, 2006.
Article in Korean | WPRIM | ID: wpr-68379

ABSTRACT

PURPOSE: Retinal blood vessels and cerebral small vessels possess similar characteristics anatomically, physiologically and embryologically. We studied the availability of abnormal fundus findings of patients who had an atherothrombotic ischemic stroke and who have the risk factors. METHODS: Fundus photographs and brain images were taken in patients who had a first-ever symptomatic ischemic stroke of large artery atherosclerosis (LAA) or small vessel occlusion (SVO) from March 2004 to February 2005. We analyzed the association between fundus abnormalities and ischemic stroke subtypes. RESULTS: Based on brain MRI and MRA, a total of 47 patients were classified into SVO and LAA groups. The SVO group consisted of 27 patients (mean age: 69.7 years), and the LAA group consisted of 20 patients (mean age: 65.4 years). The control group comprised 15 patients (mean age: 64.9 years). The baseline characteristics were similar among the three groups. The severity of the retinal arteriolar narrowing and sclerosis were associated with hypertension. Compared to the control group, both the SVO and LAA groups showed more severe arteriolar sclerosis, the SVO group showed more severe arteriolar narrowing and the LAA group showed more frequent AV crossing and retinal exudate. CONCLUSIONS: Retinal arteriolar abnormalities such as arteriolar narrowing and sclerosis are more severe in atherothrombotic ischemic stroke patients. Indirectly, retinal microvascular changes may indicate the status of the cerebral vasculature. Thus, analysis of fundus findings is useful for predicting an atherothrombotic ischemic stroke and planning follow-up examinations.


Subject(s)
Humans , Arteries , Arterioles , Atherosclerosis , Brain , Exudates and Transudates , Follow-Up Studies , Hypertension , Magnetic Resonance Imaging , Retinal Vessels , Retinaldehyde , Risk Factors , Sclerosis , Stroke
12.
Journal of the Korean Ophthalmological Society ; : 1171-1176, 2006.
Article in Korean | WPRIM | ID: wpr-161303

ABSTRACT

PURPOSE: To report a case of cancer-associated retinopathy developed in a patient with small cell lung cancer, which is a kind of paraneoplastic syndrome. METHODS: A 78-year-old woman presented complaining of decreased visual acuity and visual field that had developed about 15 days previously. She was diagnosed with small cell lung cancer 1.5 years ago and underwent 3 cycles of chemotherapy. At presentation, the best-corrected visual acuity was hand motion in both eyes and there was no afferent pupillary defect. Slit-lamp biomicroscopic examination revealed no specific abnormality in the anterior segment of either eye, and intraocular pressure was normal. Posterior segment examination demonstrated remarkable arteriolar narrowing in both eyes, but there was little doubt about the presence of an optic nerve lesion such as optic disc edema or pallor. RESULTS: Fluorescein angiography and brain magnetic resonance imaging (MRI) revealed no significant abnormalities. However, electroretinograms (ERG) demonstrated marked reduction in the a and b waves. Visual evoked response was delayed for the latency period. She was treated with systemic steroid, after which her visual acuity gradually improved.


Subject(s)
Aged , Female , Humans , Brain , Drug Therapy , Edema , Evoked Potentials, Visual , Fluorescein Angiography , Hand , Intraocular Pressure , Latency Period, Psychological , Magnetic Resonance Imaging , Optic Nerve , Pallor , Paraneoplastic Syndromes , Paraneoplastic Syndromes, Ocular , Pupil Disorders , Small Cell Lung Carcinoma , Visual Acuity , Visual Fields
13.
Chinese Journal of New Drugs and Clinical Remedies ; (12): 253-262, 2005.
Article in Chinese | WPRIM | ID: wpr-409883

ABSTRACT

The publish summarized three latest systemic reviews and given details of the landmark trail on glucosamine sulfate introduce the yesterday, today and a good future of disease modifying drug for osteoarthritis (DMOAD) on a view. It will helpful to promote the clinical, the assessment and the developing of DMOAD in China.

14.
Journal of the Korean Neurological Association ; : 552-554, 2004.
Article in Korean | WPRIM | ID: wpr-60337

ABSTRACT

Widened palpebral fissure has been regarded as one of the hallmarks of Bell's palsy. However, the palpebral fissure on the affected side may be narrower than that of the unaffected side. The narrowing of the palpebral fissure has been often thought as a sign caused by weakness of the levator palpebrae and Muller's muscles. However, weakness of the frontal muscle may cause drooping of the eyebrow, resulting in the narrowing of the palpebral fissure. We describe a patient of Bell's palsy with a narrowing of the palpebral fissure.


Subject(s)
Humans , Bell Palsy , Eyebrows , Muscles
15.
Journal of Asthma, Allergy and Clinical Immunology ; : 385-393, 2003.
Article in Korean | WPRIM | ID: wpr-20913

ABSTRACT

BACKGROUND: It has been sugested that excessive airway narrowing in asthma may be detected by a decrease in forced vital capacity (FVC). A volume differrence between slow vital capacity (SVC) and FVC may be used as a surrogate index of airway collapse. OBJECTIVE: To investigate the relationship between an airway collapsibility index (CI) and airflow limitation or airway hyperresponsiveness in asthma. METHODS: Forty-six patients with suspected asthma and 21 normal control subjects were enrolled. CI was defined as a difference between SVC and FVC, and measured before and after a methacholine (MCh) bronchoprovocation test. Positive response to MCh was defined as a fall of FEV1 by more than 12%. RESULTS: CI significantly increased from 1.10+/-3.86% to 5.52+/-7.91% after MCh in the positive MCh group (n=19, p<0.01). Not only FVC but also SVC was significantly decreased after MCh. One-fifth of the decrease in FVC was caused by the increase in CI. Both FVC and SVC were significantly related to baseline FEV1 values and in percent change after MCh. Although CI was also significantly related to FEV1 in percent change after MCh. CI was significantly higher in the positive MCh group than in the control and was not significantly related to baseline FEV1 values. Furthermore, the relationship of CI values between before and after MCh was significant (r=0.622, p<0.01). CI was not significantly different according to the severity of MCh-PC20. CONCLUSION: Because the relationship between CI and the severity of airflow limitation or MCh-PC20 was less significant. CI may be better than FVC to represent the characteristic of excessive airway narrowing in asthma.


Subject(s)
Humans , Asthma , Methacholine Chloride , Vital Capacity
16.
Journal of Asthma, Allergy and Clinical Immunology ; : 508-516, 2001.
Article in Korean | WPRIM | ID: wpr-221667

ABSTRACT

BACKGROUND: Deep inspiration not only has a bronchodilatory effect but also a bronchopro- tective effect. We compared the 2-min tidal breathing method and the five-breath dosimeter method to evaluate effect of deep inspiration on airway narrowing during methacholine provocation tests (MPT) in normal subjects. METHODS: Eleven normal volunteers (seven males and four females) inhaled five doses of methacholine (25mg/ml) at 5-min intervals during the 2-min tidal breathing method and the five-breath dosimeter method. MPT was cross-overly performed by the two methods. On first visit, a questionnaire for symptoms, allergy skin test, spirometry, and MPT (2-min tidal breathing and five-breath dosimeter method) were performed. On second visit, pulmonary function tests and methacholine challenge using the 25mg/mL dose were performed on two separate days at the same time each day. The perception of dyspnea during methacholine challenge was scored using modified Borg scale. The recovery time from maximal decrease in FEV1 to baseline FEV1 was checked without using bronchodilator after MPT. RESULTS: The maximal decreases in FEV1 and FVC during the 2-min tidal breathing method were 38.8+/-5.3% and 27.8+/-5.1%, respectively. The maximal decreases in FEV1 and FVC during the five-breath dosimeter method were 16.5+/-6.1% and 14.2+/-4.9%, respectively. Score on Borg scale during the 2-min tidal breathing method at methacholine dose 1 was from 0.5 to 7. The FEV1 and FVC at methacholine dose 1, 2, 3, 4, 5 showed significantly greater decreases during the 2-min tidal breathing method compared to those during the five-breath dosimeter method. There was significant correlation between maximal decrease in FEV1 during the five-breath dosimeter method and recovery time from decrease in FEV1 to baseline FEV1 (r=0.82; p<0.01). A significant correlation (r=0.79; p<0.05) was found between decrease in FEV1 at methacholine dose 1 during the 2-min tidal breathing method and perception score. CONCLUSION: These observations indicate that the continuous generation method produces more bronchoconstriction than the dosimeter method for delivering methacholine aerosol during MPT, suggesting inhibition of deep inspiration enhances methacholine induced airway narro- wing in normal subjects.


Subject(s)
Humans , Male , Bronchoconstriction , Dyspnea , Healthy Volunteers , Hypersensitivity , Methacholine Chloride , Respiration , Respiratory Function Tests , Skin Tests , Spirometry , Surveys and Questionnaires
17.
The Journal of the Korean Rheumatism Association ; : 293-299, 1999.
Article in Korean | WPRIM | ID: wpr-220461

ABSTRACT

OBJECTIVE: To investigate the clinical usefulness of serial measurement of erythrocyte sediment rate(ESR) and C-reactive protein(CRP) for monitoring the radiological progression in early rheumatoid arthritis(RA). METHODS: Thirty one patients with RA according to the 1987 ACR criteria, with joint symptoms for less than one year, and who had not previously received disease modifying antirheumatic drugs(DMARDs) were assessed from Oct. 1994 to Aug. 1998 in retrospective study. Area under curve(AUC) of ESR and CRP were calculated in these patients. Joing damage in the hands was assessed by modified Sharp's method. RESULTS: Male to female ratio was 1: 3.4. Median age of this group was 45.8+/-13.2 years. Patients who had positive rheumatoid factor were 82%. Mean duration until first visit was 271.9+/-145.8 days. At the first clinic visit, mean ESR and CRP were 50mm/hr and 2.0mg/dL. Mean erosions and joint space narrowing score by modified Sharp's method were 55.2 and 12.4, respectively. Correlation analysis showed that ESR AUC and CRP AUC were significantly associated with radiologic progression. CONCLUSIONS: Elevated over-time ESR and CRP provide a convenient short term correlation with radiologic outcome(i.e. erosions). Elevated over-time ESR and CRP can be used as a guide for therapy.


Subject(s)
Female , Humans , Male , Ambulatory Care , Area Under Curve , Arthritis, Rheumatoid , Erythrocytes , Hand , Joints , Retrospective Studies , Rheumatoid Factor
18.
Tuberculosis and Respiratory Diseases ; : 165-174, 1995.
Article in Korean | WPRIM | ID: wpr-196243

ABSTRACT

BACKGROUND: Exercise is one of the most common precipitants of acute asthma encountered in clinical practice. The development of airflow limitation that occurs several minutes after vigorous exercise, i. g. exercise-induced bronchoconstriction(EIB), has been shown to be closely correlated with the nonspecific bronchial hyperresponsiveness, which is the hallmark of bronchial asthma. All previous reports that assessed the correlation of EIB to nonspecific bronchial hyperresponsiveness have focused on airway sensitivity(PC20) to inhaled bronchoconstrictor such as methacholine or histamine. However, maximal airway narrowing(MAN), reflecting the extent to which the airways can narrow, when being exposed to high dose of inhaled stimuli, has not been studied in relation to the degree of EIB. METHODS: Fifty-six children with mild asthma(41 boys and 15 girls), aged 6 to 15 years(mean +/- SD, 9.9 +/- 2.5 years) completed this study. Subjects attended the laboratory on two consecutive days. Each subject performed the high-dose methacholine inhalation test at 4 p.m. on the first day. The dose-response curves were characterized by their position(PC20) and MAN, which was defined as maximal response plateau(MRP: when two or three data points of the highest concentrations fell within a 5% response range) or the last of the data points(when a plateau could not be measured). On the next day, exercise challenge, free running outdoors for ten minutes, was performed at 9 a.m.. FEV1 was measured at graduated intervals, 3 to 10 minutes apart, until 60 minutes after exercise. Response(the maximal DeltaFEV1 from the pre-exercise value) was classified arbitrarily into three groups; no response ((-) EIB: DeltaFEV1 20%). RESULTS: 1) When geometric mean PC20 of the three groups were compared, PC20 of (+) EIB group was significantly lower than that of (-)EIB group. 2) There was a close correlation between PC20 and the severity of EIB in the whole group(r= -0.568, p<0.01). 3) Of the total 56 subjects, MRP could be measured in 36 subjects, and the MRP of these subjects correlated fairly with the severity of EIB(r= 0.355, p<0.05) 4) The MAN of (+) EIB group was significantly higher than that of (-)EIB group(p<0.01). 5) The MAN correlated well with the severity of EIB in the whole group(r=0.546, p<0.01). CONCLUSION: The degree of MAN as well as bronchial sensitivity (PC2o) to methacholine is correlated well with the severity of EIB. The results suggest that the two main components of airway hyperresponsiveness may be equally important determinants of exercise reactivity, although the mechanism may be different from each other. The present study also provides further evidence that EIB is a manifestation of the increased airway reactivity characteristic of bronchial asthma.


Subject(s)
Child , Humans , Asthma , Bronchoconstriction , Histamine , Inhalation , Methacholine Chloride , Running
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