Abstract
BackgroundNationwide data on the prevalence of atrioventricular (AV) block are currently unavailable in China. Thus, we aimed to assess the prevalence and risk factors of AV block among Chinese health examination adults.MethodsA total of 15,181,402 participants aged ≥ 18 years (mean age 41.5 ± 13.4 years, 53.2% men) who underwent an electrocardiogram as a part of routine health examination in 2018 were analyzed. AV block was diagnosed by physicians using 12-lead electrocardiogram. Overall and stratified prevalence (by age, sex, and city size) of all, first-, second- and third-degree AV block were calculated. Multivariable logistic regression analyses were performed to explore risk factors associated with AV block.ResultsAV block was observed in 88,842 participants, including 86,153 with first-degree, 2249 with second-degree and 440 with third-degree AV block. The age- and sex-standardized prevalence rate [95% confidence interval (CI)] of all, first-, second- and third-degree AV block were 7.06‰ (7.01–7.11), 6.84‰ (6.79–6.89), 0.18‰ (0.17–0.18) and 0.04‰ (0.03–0.04) respectively. After multivariable adjustment, the risk of AV block was positively associated with older age, being male, lower heart rate, higher body mass index, hypertension, diabetes and low high-density lipoprotein cholesterol. High total cholesterol was associated with a lower risk of AV block.ConclusionFirst-degree AV block is relatively common while severe AV block is rare in health examination adults. Besides, AV block was highly prevalent among the elderly. The risk of AV block was associated with older age, being male and metabolic factors.
Highlights
Atrioventricular (AV) block is a loss of normal function of the cardiac conductive pathway between the atrium and the ventricle
We aimed to examine the prevalence of first, second- and third-degree AV block and explored related risk factors of AV block based on the database of 15,181,402 Chinese adults from 30 provinces who underwent a 12-lead electrocardiogram (ECG) as a part of routine health examination in 2018
The prevalence was higher among older participants, higher among men, higher among small city (Table 2)
Summary
Atrioventricular (AV) block is a loss of normal function of the cardiac conductive pathway between the atrium and the ventricle. It can be divided into three degrees: firstdegree, second-degree (type-I or II) and third-degree [1, 2]. The first-degree and type-I second-degree AV block are considered to be relatively benign conditions [1, 2]. The prognosis of type-II second-degree and third-degree AV block are generally poor and always require clinical treatment such as medication or pacemaker implantation [6, 7]. Nationwide data on the prevalence of atrioventricular (AV) block are currently unavailable in China. We aimed to assess the prevalence and risk factors of AV block among Chinese health examination adults
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