Korean Circ J.  2016 Sep;46(5):681-687. 10.4070/kcj.2016.46.5.681.

Prevalence of Masked Hypertension: a Population-Based Survey in a Large City by Using 24-Hour Ambulatory Blood Pressure Monitoring

• Rhee MY
• Kim SW
• Choi EH
• Kim JH
• Nah DY
• Shin SJ
• Gu N

• KMID: 2389626
• DOI: http://doi.org/10.4070/kcj.2016.46.5.681

Abstract

BACKGROUND AND OBJECTIVES
We estimated the prevalence of hypertension and hypertension subtypes in a large semi-urban city in Korea, using 24-hour ambulatory blood pressure monitoring (ABPM) in a randomly selected sample population.
SUBJECTS AND METHODS
A random sample (aged 20-65 years) from a city with an adult population of approximately 600000 was selected by using a list-assisted random digit dialing method. The 24-hour ABPM and conventional blood pressure measurement (CBPM) of these individuals were obtained.
RESULTS
Among the 496 participants, valid 24-hour ABPM and CBPM were obtained from 462 (93%) individuals. The estimated prevalence of hypertension in Goyang was 17.54% by CBPM and 32.70% by 24-hour ABPM (p<0.01). In the age stratified analysis, both CBPM and 24-hour ABPM showed increased prevalence of hypertension with age. The estimated prevalence of masked hypertension was 16.22% and that of white-coat hypertension was 1.08%. Men had a higher prevalence of masked hypertension than women (20.79% vs. 11.86%, p=0.0295). The estimated prevalence of masked hypertension was 17.5%, 20.58%, 24.34%, and 13.29% in the age categories of 30s, 40s, 50s, and 60s, respectively. The estimated prevalence of masked uncontrolled hypertension was 26.79% in patients with hypertension who were taking antihypertensive medications.
CONCLUSION
The estimated prevalence of hypertension by 24-hour ABPM was higher than that by CBPM, revealing high prevalence of masked hypertension. The high prevalence of masked hypertension supports the adoption of ABPM in the national population survey and clinical practice to improve public health and reduce health care costs.

Keyword

Masked hypertension; Ambulatory blood pressure monitoring; Prevalence

MeSH Terms

Adult
Blood Pressure
Blood Pressure Monitoring, Ambulatory*
Female
Health Care Costs
Humans
Hypertension
Korea
Male
Masked Hypertension*
Masks*
Methods
Prevalence*
Public Health

Figure

• 

  Fig. 1 Estimated prevalence of hypertension according to age categories. Conventional blood pressure in Goyang residents was measured by the semi-automated oscillometric device. Conventional blood pressure in Seoul residents was measured by the auscultatory method with a mercury sphygmomanometer. Standard error was provided. CBPM: conventional blood pressure measurement, ABPM: ambulatory blood pressure monitoring.

• 

  Fig. 2 The estimated prevalence of masked hypertension according to age categories. Standard error was provided.

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