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Wave intensity as a useful modality for assessing ventilation–perfusion imbalance in subclinical patients with hypertension

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Abstract

Wave intensity (WI) is a novel noninvasive index of circulatory dynamics that reflects ventriculo-arterial coupling. It is calculated as the product of the first derivative of blood pressure and that of flow velocity measured by carotid echocardiography. This study aimed to clarify the clinical implications of WI and its relation with carbon dioxide production (VE/VCO2 slope). Twenty-one healthy volunteers (control group) and 21 patients with hypertension (HT group) underwent cardiopulmonary exercise testing (CPX) and exercise stress echocardiography. WI was assessed in the right carotid artery using an ultrasound system. The first peak of WI (W1) during the early ejection phase was measured at baseline and mitral annular velocity was assessed by tissue Doppler imaging. Ventilatory kinetics during exercise was assessed using the relation of minute ventilation to VE/VCO2 slope. VE/VCO2 slope, W1, and E/E′ were greater in the HT group than in the control group. PeakVO2 and VO2 at the anaerobic threshold were lower in the HT group than in the control group. VE/VCO2 slope was significantly correlated with W1 (r = 0.58, p < 0.01) and E/E′ (r = 0.44, p < 0.01). Stepwise multivariate analysis revealed that W1 was an independent determinant of VE/VCO2 slope (β = 0.43, p < 0.01). In conclusion, W1 might be able to predict the severity of heart failure without the need for CPX. Moreover, WI may be a useful modality in assessing heart failure pathophysiology based on ventriculo-arterial coupling.

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Acknowledgements

This study was supported by Professor Kiyomi Niki, Tokyo City University, and Motoaki Sugawara, Himeji Dokkyo University. The authors thank the technologists in the clinical laboratory at Tsukuba University Hospital for their help with the data collection.

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Authors and Affiliations

  1. Faculty of Engineering, Department of Human Environmental Sciences, Shonan Institute of Technology, Fujisawa, Kanagawa, Japan

    Yoshie Nogami

  2. Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8575, Japan

    Yoshie Nogami, Yoshihiro Seo, Masayoshi Yamamoto, Tomoko Ishizu & Kazutaka Aonuma

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  1. Yoshie Nogami
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  2. Yoshihiro Seo
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Correspondence to Yoshihiro Seo.

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Nogami, Y., Seo, Y., Yamamoto, M. et al. Wave intensity as a useful modality for assessing ventilation–perfusion imbalance in subclinical patients with hypertension. Heart Vessels 33, 931–938 (2018). https://doi.org/10.1007/s00380-018-1138-0

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  • DOI: https://doi.org/10.1007/s00380-018-1138-0

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