Osamu Nagayama
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Explore the profile of Osamu Nagayama including associated specialties, affiliations and a list of published articles.
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22
Citations
64
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Recent Articles
1.
Qin R, Koike A, Nagayama O, Takayanagi Y, Wu L, Nishi I, et al.
Biosci Trends
. 2018 Aug;
12(4):432-437.
PMID: 30101836
Ventilation (VE) increases linearly with the increase of carbon dioxide output (VCO2) during cardiopulmonary exercise testing. VE-VCO2 slope rises in parallel with exercise intensity, reaches a turning point (called the...
2.
Himi T, Koike A, Nagayama O, Kato Y, Nishi I, Sato A, et al.
Int Heart J
. 2018 Jun;
59(4):713-718.
PMID: 29877304
Cardiac patients often experience nocturnal and daytime oscillatory breathing (OB). OB noted at rest sometimes becomes unclear or even disappears during exercise. We evaluated the physiological significance of OB by...
3.
Kato Y, Suzuki S, Uejima T, Semba H, Nagayama O, Hayama E, et al.
Eur J Prev Cardiol
. 2018 Feb;
25(7):731-739.
PMID: 29433335
Background Ventilatory efficiency decreases with age. This study aimed to investigate the prognostic significance and cut-off value of the minute ventilation/carbon dioxide production (VE/VCO) slope according to age in patients...
4.
Takayanagi Y, Koike A, Nagayama O, Nagamine A, Qin R, Kato J, et al.
J Cardiol
. 2017 May;
70(6):598-606.
PMID: 28528994
Background: Overshoot phenomena of the gas exchange ratio (R:VCO/VO), ventilatory equivalent for O (VE/VO), and end-tidal O pressure (PETO) are commonly observed during recovery from maximal cardiopulmonary exercise testing (CPX)....
5.
Kato Y, Suzuki S, Uejima T, Semba H, Nagayama O, Hayama E, et al.
Eur J Prev Cardiol
. 2016 Feb;
23(13):1429-36.
PMID: 26879567
Background: Resting heart rate is a surrogate marker associated with achieved exercise capacity, which has been observed in patients with sinus rhythm. The aim of this study was to examine...
6.
Nagayama O, Koike A, Himi T, Sakurada K, Kato Y, Suzuki S, et al.
Am J Cardiol
. 2015 Jan;
115(5):691-6.
PMID: 25591892
A spiral phenomenon is sometimes noted in the plots of CO₂ output (VCO₂) against O₂ uptake (VO₂) measured during cardiopulmonary exercise testing (CPX) in patients with heart failure with oscillatory...
7.
Kato J, Koike A, Hoshimoto-Iwamoto M, Nagayama O, Sakurada K, Sato A, et al.
Circ J
. 2012 Dec;
77(3):661-6.
PMID: 23229462
Background: Oscillatory breathing, alternating between hyperpnea and hypopnea, has been recognized in cardiac patients, especially in those with heart failure. We evaluated whether the cycle length and amplitude of oscillatory...
8.
Tsuneoka H, Koike A, Nagayama O, Sakurada K, Kato J, Sato A, et al.
Int Heart J
. 2012 Jun;
53(2):102-7.
PMID: 22688313
Parameters obtained from cardiopulmonary exercise testing (CPX) are recognized for their high prognostic value in predicting future cardiac events in cardiac patients. Our group compared the prognostic value of CPX...
9.
Kaneko H, Koike A, Senoo K, Tanaka S, Suzuki S, Nagayama O, et al.
J Cardiol
. 2012 Mar;
59(3):359-65.
PMID: 22421198
Background: The presence of heart failure (HF) with preserved ejection fraction (HFPEF) is increasingly recognized. However, prognostic factors for HFPEF remain unclear. Methods And Results: The data were derived from...
10.
Suzuki T, Koike A, Nagayama O, Sakurada K, Tsuneoka H, Kato J, et al.
Circ J
. 2012 Feb;
76(4):876-83.
PMID: 22322878
Background: Transient increases (overshoot) in respiratory gas variables have been observed during exercise recovery, but their clinical significance is not clearly understood. Our group evaluated the relationship between the presence...