Cardiopulmonary Exercise Testing in Children and Adolescents with Asthma Who Report Symptoms of Exercise-Induced Bronchoconstriction

Patients with asthma often report symptoms of exercise-induced bronchoconstriction. We performed cardiopulmonary exercise testing to establish the cause of exercise limitation in patients with asthma, under treatment, who reported symptoms of exercise-induced bronchoconstriction. Ten of the 42 patients meeting criteria for inclusion in our study (24%) developed exercise-induced bronchoconstriction. Exercise limitation without exercise-induced bronchoconstriction was found in both obese and non-obese patients, suggesting that poor fitness is a problem independent of body habitus. Including cardiopulmonary exercise testing in the management of children with suspected exercise-induced bronchoconstriction would provide a better understanding of the etiology of their symptoms and facilitate more appropriate treatment.     

Proventil HFA Prevents Exercise-Induced Bronchoconstriction in Children

Short-acting inhaled beta₂-agonists used just prior to exercise are an effective method for preventing exercise-induced bronchoconstriction (EIB) in children. This was a randomized, single-blind, placebo-controlled, four-period crossover study that compared the effectiveness of albuterol formulated in hydrofluoro-alkane-134a (HFA) to albuterol formulated in chlorofluorocarbons (CFCs) and to placebo in protecting asthmatic children age 6-11 from EIB. Patients self-administered either HFA albuterol, two different CFC albuterol products, or placebo 30 min prior to exercise challenge. Spirometry was performed predose and 5, 10, 15, 30, 45, 60, 75, and 90 min after the exercise challenge was completed. The smallest percent change from the predose forced expiratory volume in 1 sec (FEV₁) after exercise challenge was similar for the three active treatments, and each of the active treatments was significantly better than placebo. Each active treatment had significantly fewer patients unprotected from EIB (unprotected defined as having ≥20% fall in FEV, after exercise challenge) than placebo. Changes in heart rate, blood pressure and electrocardiogram     

Proventil HFA Prevents Exercise-Induced Bronchoconstriction in Children

Short-acting inhaled beta₂-agonists used just prior to exercise are an effective method for preventing exercise-induced bronchoconstriction (EIB) in children. This was a randomized, single-blind, placebo-controlled, four-period crossover study that compared the effectiveness of albuterol formulated in hydrofluoro-alkane-134a (HFA) to albuterol formulated in chlorofluorocarbons (CFCs) and to placebo in protecting asthmatic children age 6-11 from EIB. Patients self-administered either HFA albuterol, two different CFC albuterol products, or placebo 30 min prior to exercise challenge. Spirometry was performed predose and 5, 10, 15, 30, 45, 60, 75, and 90 min after the exercise challenge was completed. The smallest percent change from the predose forced expiratory volume in 1 sec (FEV₁) after exercise challenge was similar for the three active treatments, and each of the active treatments was significantly better than placebo. Each active treatment had significantly fewer patients unprotected from EIB (unprotected defined as having ≥20% fall in FEV, after exercise challenge) than placebo. Changes in heart rate, blood pressure and electrocardiogram     

肥厚型心肌病患者的心肺功能评估和相关因素研究

目的:探究肥厚型心肌病(HCM)患者的心肺功能评估和相关因素.方法:连续入选2018年4月至2019年8月期间在中国医学科学院阜外医院功能检测中心行心肺运动试验(CPET)的HCM患者129例为HCM组,另选择与HCM组性别、年龄、体重匹配的健康者113例为正常对照组.HCM组和正常对照组均在医生的监督下进行症状限制性...     

Protection Against Exercise-Induced Bronchoconstriction Two Hours After a Single Oral Dose of Montelukast

The objective of this double-blind cross-over study was to evaluate montelukast for the prevention of exercise-induced bronchoconstriction (EIB). Sixty-two patients with EIB (post-exercise decrease in forced expiratory volume in 1 second (FEV₁) ≥ 20% at pre-randomization) were randomized to montelukast 10 mg or placebo, followed by exercise-challenge 2, 12, and 24 hours postdose. The primary endpoint was the maximum percent-fall in FEV₁ (from pre-exercise FEV₁) during 60 minutes after exercise-challenge at 2 hours postdose. This endpoint was improved after montelukast (mean ± SD = 11.7% ± 10.8) versus placebo (17.5% ± 13.8) (p ≤ 0.001); numerically greater improvements were seen at 12 hours and 24 hours. A quicker time to recovery after challenge (p ≤ 0.001) and a smaller area under the curve for percent-fall in FEV₁ during 60 minutes after challenge (p ≤ 0.01) were seen with montelukast at 2 hours. At this timepoint, more patients taking montelukast (45/54) than taking placebo (37/54) were protected against EIB (p = 0.039). We concluded that montelukast provided significant protection against EIB at 2 hours after a single dose.     

Bruce-Q运动方案在心肺运动试验中的临床研究

采用心肺运动试验评定心脏起搏和其他器质性心脏病患者的全身耐力和心力储备,综合Ｂｒｕｃｅ方案和Ｎａｕｇｈｔｏｎ方案,在Ｂｒｕｃｅ方案的基础上增加１ｍｐｈ平板速度、５％斜率的运动负荷做为第一级运动,其余各级按照Ｂｒｕｃｅ方案进行。对１４７人进行了最大症状限制性心肺运动试验。其中正常人４０人、ＶＶＩＲ起搏２６例、其他器质性心脏病患者４１例。结果：正常人运动时间１２ｍｉｎ左右,非起搏心脏病患者和心脏起搏患者的运动时间６ｍｉｎ左右。窦房结对运动的反应呈频率应变的方式,其心率与做功的关系为Ｙ＝７５＋０．４１Ｘ;体动式频率应变性起搏频率和做功的关系为Ｙ＝８３．３９＋０．１８Ｘ。此外根据本方案运动试验的结果可进行心功能分级：能完成本方案的四、三、二、一级运动的心功能分级分别为一、二、三、四级。结论：本方案适宜正常人、非起搏心脏病患者和起搏患者的心肺运动试验。     

Relationship between Exercise-Induced Bronchospasm (EIB) and Asthma Control Test (ACT) in Asthmatic Children

Objective. Evaluate the relationship between Asthma Control Test? (ACT) and exercise-induced bronchospasm (EIB) in 81 asthmatic children. Methods. EIB was assessed in every patient by Balke protocol and asthma control was evaluated by ACT. Patients were divided into three groups: Group A (30 patients) with complete asthma control (ACT score = 25), Group B (37 patients) with partial asthma control (ACT score = 21–24), and Group C (14 patients) with poor asthma control (ACT score < 20). Results. About 36% (11/30) of patients in Group A (with complete asthma control) tested positive for EIB, whereas 21% (8/37) in Group B (with partial asthma control) and 28% (4/14) in Group C (with poor asthma control) exhibited EIB. The percentage of positive EIB was very similar between the three groups with no differences between controlled, partially controlled, and uncontrolled asthma. Statistical evaluation by χ²-test between complete (ACT score = 25) and not complete asthma control (ACT score < 24) confirmed a statistically significant difference (p < .01) between the obtained data. Conclusions. It must be stated that ACT alone is not sufficient to evaluate asthma control in children correctly because it fails to detect EIB in a significant percentage of subjects.     

Behavioral Problems in Children and Adolescents with Difficult-To-Treat Asthma

Background. The aim of this study was to quantify behavioral problems in clinically treated children and adolescents with asthma and to examine the association of these problems and quality of life with difficult-to-treat asthma. Methods. Clinical patients with difficult-to-treat asthma (n = 31) and patients with asthma who were not classified as difficult-to-treat asthma (n = 52) completed the Pediatric Asthma Quality of Life Questionnaire [PAQLQ(S)]. Their parents completed the Child Behavior Checklist (CBCL) to assess behavioral problems. Behavioral problem scores were compared to norms of population reference groups and both behavioral problems and quality of life were compared between children and adolescents with and without difficult-to-treat asthma. Results. Especially internalizing behavioral problems such as being withdrawn/depressed and somatic complaints were more severe in the asthmatic groups compared to the healthy reference groups. The behavioral problems ‘somatic complaints’ and ‘thought problems’ as well as a lower quality of life were more severe in children and adolescents with difficult-to-treat asthma than in asthma patients who did not fulfill the criteria of difficult-to-treat asthma. Conclusions. Behavioral problems and a lower quality of life are suggested to be more pronounced in clinically treated children and adolescents with difficult-to-treat asthma than in asthma patients who are not classified as difficult-to-treat asthma. With respect to practical implications, our data suggest that health-care professionals should – especially in children and adolescents with difficult-to-treat asthma – assess and, if necessary, treat behavioral problems.     

Increased Airway Hyperreactivity with the M40 Protective Mask in Exercise-Induced Bronchospasm

Objective. Exercise-induced bronchospasm (EIB) has a prevalence of 6% to 7% in United States Army personnel and 3% to 13% in professional athletes. There are reported concerns that military personnel with EIB will have increased airway hyperreactivity or significant dyspnea while wearing the standard military M40 protective mask. The objective of this study is to determine whether the M40 protective gas mask increases airway hyperreactivity in military personnel with exertional dyspnea and the diagnosis of EIB. Methods. Ten active duty military with EIB (defined as history of exertional dyspnea, normal spirometry, and reactive methacholine challenge test) and 10 normal control subjects were evaluated. Both the participants and control subjects underwent baseline exercise challenge testing (ECT) with and without the M40 protective mask. Forced expiratory volume in one second (FEV₁) (percent predicted) post ECT was compared to baseline FEV₁ within and between groups along with exercise time. Results. There was no statistical difference in between individuals and between groups wearing the M40 mask. None of the study group had a positive ECT exercising without the M40 mask while 20% of the study group with EIB had a positive ECT wearing the M40 mask. Conclusion. Military personnel with EIB who exercised with the M40 protective mask did not overall have significantly increased airway hyperreactivity compared to control subjects. Screening ECT may be beneficial in identifying those susceptible persons who report symptoms while wearing the M40 protective mask.     

Increased Airway Hyperreactivity with the M40 Protective Mask in Exercise-Induced Bronchospasm

Objective. Exercise-induced bronchospasm (EIB) has a prevalence of 6% to 7% in United States Army personnel and 3% to 13% in professional athletes. There are reported concerns that military personnel with EIB will have increased airway hyperreactivity or significant dyspnea while wearing the standard military M40 protective mask. The objective of this study is to determine whether the M40 protective gas mask increases airway hyperreactivity in military personnel with exertional dyspnea and the diagnosis of EIB. Methods. Ten active duty military with EIB (defined as history of exertional dyspnea, normal spirometry, and reactive methacholine challenge test) and 10 normal control subjects were evaluated. Both the participants and control subjects underwent baseline exercise challenge testing (ECT) with and without the M40 protective mask. Forced expiratory volume in one second (FEV₁) (percent predicted) post ECT was compared to baseline FEV₁ within and between groups along with exercise time. Results. There was no statistical difference in between individuals and between groups wearing the M40 mask. None of the study group had a positive ECT exercising without the M40 mask while 20% of the study group with EIB had a positive ECT wearing the M40 mask. Conclusion. Military personnel with EIB who exercised with the M40 protective mask did not overall have significantly increased airway hyperreactivity compared to control subjects. Screening ECT may be beneficial in identifying those susceptible persons who report symptoms while wearing the M40 protective mask.     

Differences in the Evaluation and Management of Exercise-Induced Bronchospasm between Family Physicians and Pulmonologists

Previous studies have demonstrated that specialists and generalists differ in the evaluation and management of asthma especially in terms of use of objective testing. We speculated that there also may be differences in the diagnosis and management of exercise-induced respiratory complaints. An Internet survey was sent to samples of pulmonologists and family physicians. Our data suggests that pulmonologists are much more likely to order bronchoprovocation testing than family physicians, and family physicians are more likely to start any empiric therapy than perform bronchoprovocation testing when exercise-induced bronchospasm is suspected. These differences may lead to inaccurate or missed diagnoses and unnecessary morbidity.     

Differences in the Evaluation and Management of Exercise-Induced Bronchospasm between Family Physicians and Pulmonologists

Previous studies have demonstrated that specialists and generalists differ in the evaluation and management of asthma especially in terms of use of objective testing. We speculated that there also may be differences in the diagnosis and management of exercise-induced respiratory complaints. An Internet survey was sent to samples of pulmonologists and family physicians. Our data suggests that pulmonologists are much more likely to order bronchoprovocation testing than family physicians, and family physicians are more likely to start any empiric therapy than perform bronchoprovocation testing when exercise-induced bronchospasm is suspected. These differences may lead to inaccurate or missed diagnoses and unnecessary morbidity.     

Characteristics of Children with Asthma Who Achieved Remissionof Asthma

Objective. To characterize two groups of asthmatics who had achieved remission and those who had not achieved remission of asthma. Methods. The study was a retrospective cohort study based on 117 asthmatic children who participated in a previous study. We categorized the children into two groups: asthmatics with remission versus asthmatics without remission. We defined remission of asthma as lack of symptoms/signs of asthma or asthma-related medications or health care services for at least three consecutive years. Long-term remission was defined by no relapse of asthma after achieving remission. We characterized these groups. Results. Of the 117 subjects, 70 (60%) were male, 91 (78%) were Caucasians, and the mean age at index date of asthma was 8.1 years. A total of 59 asthmatic children (50%) achieved remission and 28 asthmatics (24%) achieved long-term remission. Asthmatics with remission were more likely to be Caucasian (87%) compared to those without (69%) (p = .039) There were no differences in the frequency of visits for viral (0.3 vs. 0.4 per person-years, p = .29) or bacterial infections (0.7 vs. 0.5 per person-years, p = .49) between asthmatics with and without remission. Gender, socioeconomic status, smoking exposure, family history of asthma or atopy, breastfeeding history, peak flow meter availability, asthma action plan, and influenza vaccinations were not associated with remission. Conclusions. Only half of asthmatic children accomplished remission of asthma ever and 24% of asthmatic children had long-term remission. Ethnicity may affect remission of asthma but microbial infections may not influence the likelihood of remission of asthma and vice versa.     

The Prevalence of Asthma in an NCAA Division I Collegiate Athletic Program

Purpose. To determine the prevalence of asthma among all varsity athletes in a large National Collegiate Athletic Association (NCAA) Division I program. Methods. We retrospectively reviewed the medical records for all varsity athletes at The Ohio State University (OSU). Data were abstracted from patient charts that contained a Medical Health Questionnaire, annual physical examinations, and medical encounters by the OSU Sports Medicine staff. A diagnosis of asthma was defined by self-report of physician diagnosis as recorded in the medical record. Results. Overall, 130 of 763 (17.0%) athletes had a diagnosis of asthma. Females (67/280 or 23.9%) had a significantly higher prevalence of asthma than males (63/483 or 13.0%) (p value = 0.001). There was no significant difference in the prevalence of asthma between high- and low-ventilation sports. (p value = 0.201). Conclusions. The prevalence of asthma among varsity athletes at The Ohio State University is 17.0%, which is significantly higher than the reported prevalence of asthma in the general United States population between 18 to 24 years of age. More females had asthma in our study population than males. These data will allow for future studies and development of focused screening programs of collegiate athletes.     

Determinants of the Severity of Exercise-Induced Bronchoconstriction in Patients with Asthma

Aim. In examining the mechanisms of exercise-induced bronchoconstriction (EIB), it is important to determine which factors most strongly affect the severity of EIB. We determined such factors in patients with asthma by stepwise multiple-regression analysis. Methods. Twenty-three patients with asthma underwent pulmonary function tests, methacholine provocation test, and sputum induction. Eosinophilic inflammatory indices and airway vascular permeability index (ratio of albumin concentrations in induced sputum and serum) were examined in sputum samples, and then an exercise test was performed by all asthmatics. Results. There was a significant correlation between the severity of EIB and degree of eosinophilic inflammation in induced sputum. Moreover, there was a significant correlation between the severity of EIB and airway vascular permeability index. Although we could not find a significant correlation between the severity of EIB and 1-sec forced expired volume, 20% provocation concentration of (PC₂₀) methacholine tended to be correlated with the severity of EIB. By stepwise multiple-regression analysis, we also found that airway vascular permeability index, eosinophil cationic protein levels in sputum, and PC₂₀ methacholine are independent predictors of the severity of EIB. Conclusion. We found that airway vascular hyperpermeability, eosinophilic inflammation, and bronchial hyperreactivity are independent factors predicting the severity of EIB.