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Korean J Fam Med > Volume 40(1); 2019 > Article
Korean Journal of Family Medicine 2019;40(1):39-44.
DOI: https://doi.org/10.4082/kjfm.18.0077    Published online January 9, 2019.
The Relationship between Heart Rate Variability and Aortic Knob Width
Si-Yeun Sung, Jee-Hye Han  , Jung-Hwan Kim  , Kil-Young Kwon, Seong-Wook Park
Department of Family Medicine, Nowon Eulji Medical Center, Eulji University, Seoul, Korea
Corresponding author:  Jee-Hye Han, Tel: +82-2-970-8515, Fax: +82-2-970-8370, 
Email: hanjh1611@eulji.ac.kr
Received: 29 May 2018   • Revised: 18 September 2018   • Accepted: 27 September 2018
Abstract
Background
The aortic knob width (AKW) and the heart rate variability (HRV) were suggested to be related to development of cardiovascular diseases. However, the relationship between them has not been investigated; thus, this study aimed to determine this relationship.
Methods
This study included 587 Koreans aged 18–79 years. Their physical measurements, medical and social histories, blood test findings, and chest radiographs were obtained. The HRV parameters included the standard deviation of the N-N interval (SDNN), root mean square of successive differences (RMSSD), approximate entropy (ApEn), total power (TP), very low frequency (VLF), low frequency (LF), high frequency (HF), and LF/HF ratio, which were measured for 5 minutes. The AKW was measured on chest radiographs by a single reviewer.
Results
The AKW was significantly correlated with the HRV parameters, except for the LF/HF ratio. However, RMSSD and ApEn were not significantly related to the AKW in women. After dividing the participants into quartile groups, the AKW was significantly related to the SDNN, RMSSD, TP, VLF, LF, and HF. The HRV parameter values decreased in the higher AKW quartile groups, the HRV parameter values decreased. After adjusting for sex, drinking status, exercise habits, smoking status, waist circumference, and triglyceride, low-density lipoprotein cholesterol, fasting blood sugar, and glycated hemoglobin levels, the AKW showed significant negative associations with the HRV parameters, except for the LF/HF ratio.
Conclusion
The AKW is significantly associated with the HRV parameters of SDNN, RMSSD, ApEn, TP, VLF, LF, and HF.
Key Words: Heart Rate Variability; Aortic Knob Width; Cardiovascular Diseases; Thoracic Aorta


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