Massachusetts General Hospital, Boston, Massachusetts, USA.
Harvard Medical School, Boston, Massachusetts, USA.
J Glob Health. 2019 Jun;9(1):010434. doi: 10.7189/jogh.09.010434.
BACKGROUND: The global burden of chronic obstructive pulmonary disease (COPD) disproportionately affects resource-limited settings such as sub-Saharan Africa (SSA), but population-based prevalence estimates in SSA are rare. We aimed to estimate the population prevalence of COPD and chronic respiratory symptoms in rural southwestern Uganda. METHODS: Adults at least 18 years of age who participated in a population-wide census in rural southwestern Uganda completed respiratory questionnaires and lung function testing with bronchodilator challenge at health screening events in June 2015. We defined COPD as post-bronchodilator forced expiratory volume in one second to forced vital capacity ratio less than the lower limit of normal. We fit multivariable linear and log binomial regression models to estimate correlates of abnormal lung function and respiratory symptoms, respectively. We included inverse probability of sampling weights in models to facilitate population-level estimates. RESULTS: Forty-six percent of census participants (843/1814) completed respiratory questionnaires and spirometry, of which 565 (67%) met acceptability standards. COPD and respiratory symptom population prevalence were 2% (95% confidence interval (CI) = 1%-3%) and 30% (95% CI = 25%-36%), respectively. Respiratory symptoms were more prevalent and lung function was lower among women and ever-smokers ( < 0.05). HIV serostatus was associated with neither respiratory symptoms nor lung function. CONCLUSIONS: COPD population prevalence was low despite prevalent respiratory symptoms. This work adds to the growing body of literature depicting lower-than-expected COPD prevalence estimates in SSA and raises questions about whether the high respiratory symptom burden in rural southwestern Uganda represents underlying structural lung disease not identified by screening spirometry.
背景:慢性阻塞性肺疾病(COPD)的全球负担不成比例地影响资源有限的环境,如撒哈拉以南非洲(SSA),但 SSA 中基于人群的患病率估计很少。我们旨在估计乌干达西南部农村地区 COPD 和慢性呼吸道症状的人群患病率。
方法:至少 18 岁的成年人参加了乌干达西南部农村地区的人口普查,在 2015 年 6 月的健康筛查活动中完成了呼吸问卷和支气管扩张剂挑战后的肺功能测试。我们将 COPD 定义为支气管扩张剂后一秒用力呼气量与用力肺活量的比值低于正常下限。我们分别使用多变量线性和对数二项式回归模型来估计异常肺功能和呼吸症状的相关因素。我们在模型中包含了抽样反概率权重,以促进人群水平的估计。
结果:人口普查参与者中有 46%(843/1814)完成了呼吸问卷和肺活量测定,其中 565 人(67%)符合可接受性标准。COPD 和呼吸症状的人群患病率分别为 2%(95%置信区间(CI)=1%-3%)和 30%(95%CI=25%-36%)。女性和曾经吸烟者的呼吸症状更常见,肺功能更低(<0.05)。艾滋病毒血清阳性状态与呼吸症状或肺功能均无关。
结论:尽管存在普遍的呼吸症状,但 COPD 的人群患病率较低。这项工作增加了越来越多的文献描述 SSA 中 COPD 预期患病率较低的内容,并提出了一个问题,即乌干达西南部农村地区高呼吸症状负担是否代表了未通过筛查肺功能检测到的潜在结构性肺部疾病。
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