Search Results - "Nagayama, Osamu"

The relationship between resting heart rate and peak VO2: A comparison of atrial fibrillation and sinus rhythm by Kato, Yuko, Suzuki, Shinya, Uejima, Tokuhisa, Semba, Hiroaki, Nagayama, Osamu, Hayama, Etsuko, Yamashita, Takeshi

“…Background Resting heart rate is a surrogate marker associated with achieved exercise capacity, which has been observed in patients with sinus rhythm. The aim…”
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Clinical significance of the overshoot phenomena of respiratory gas indices during recovery from maximal exercise testing by Takayanagi, Yuta, BS, Koike, Akira, MD, FJCC, Nagayama, Osamu, PhD, Nagamine, Arisa, BS, Qin, Rujie, MD, Kato, Jo, MD, Nishi, Isao, MD, Himi, Tomoko, MD, Kato, Yuko, MD, Sato, Akira, MD, FJCC, Yamashita, Takeshi, MD, FJCC, Aonuma, Kazutaka, MD, FJCC

“…Abstract Background Overshoot phenomena of the gas exchange ratio ( R :VCO2 /VO2 ), ventilatory equivalent for O2 (VE/VO2 ), and end-tidal O2 pressure (PETO2 )…”
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Clinical Significance of the Presence of Oscillatory Breathing Both at Rest and During Exercise in Cardiac Patients by Himi, Tomoko, Koike, Akira, Nagayama, Osamu, Kato, Yuko, Nishi, Isao, Sato, Akira, Yamashita, Takeshi, Aonuma, Kazutaka

“…Cardiac patients often experience nocturnal and daytime oscillatory breathing (OB). OB noted at rest sometimes becomes unclear or even disappears during…”
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Relation Between Oscillatory Breathing and Cardiopulmonary Function During Exercise in Cardiac Patients by Kato, Jo, Koike, Akira, Hoshimoto-Iwamoto, Masayo, Nagayama, Osamu, Sakurada, Koji, Sato, Akira, Yamashita, Takeshi, Wasserman, Karlman, Aonuma, Kazutaka

“…Background: Oscillatory breathing, alternating between hyperpnea and hypopnea, has been recognized in cardiac patients, especially in those with heart failure…”
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Clinical significance of respiratory compensation during exercise testing in cardiac patients by Qin, Rujie, Koike, Akira, Nagayama, Osamu, Takayanagi, Yuta, Wu, Longmei, Nishi, Isao, Kato, Yuko, Sato, Akira, Yamashita, Takeshi, Aonuma, Kazutaka, Ieda, Masaki

“…Ventilation (VE) increases linearly with the increase of carbon dioxide output (VCO2) during cardiopulmonary exercise testing. VE-VCO2 slope rises in parallel…”
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Overshoot Phenomena of Respiratory Gas Variables During Exercise Recovery in Cardiac Patients by Suzuki, Takeya, Koike, Akira, Nagayama, Osamu, Sakurada, Koji, Tsuneoka, Hidekazu, Kato, Jo, Yamashita, Takeshi, Yamazaki, Junichi

“…Background: Transient increases (overshoot) in respiratory gas variables have been observed during exercise recovery, but their clinical significance is not…”
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Clinical Significance of a Spiral Phenomenon in the Plot of CO2 Output Versus O2 Uptake During Exercise in Cardiac Patients by Nagayama, Osamu, BS, Koike, Akira, MD, Himi, Tomoko, MD, Sakurada, Koji, MS, Kato, Yuko, MD, Suzuki, Shinya, MD, Sato, Akira, MD, Yamashita, Takeshi, MD, Wasserman, Karlman, MD, PhD, Aonuma, Kazutaka, MD

“…A spiral phenomenon is sometimes noted in the plots of CO2 output (VCO2 ) against O2 uptake (VO2 ) measured during cardiopulmonary exercise testing (CPX) in…”
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Role of cardiopulmonary dysfunction and left atrial remodeling in development of acute decompensated heart failure in chronic heart failure with preserved left ventricular ejection fraction by Kaneko, Hidehiro, MD, Koike, Akira, MD, FJCC, Senoo, Keitaro, MD, Tanaka, Shingo, MD, Suzuki, Shinya, MD, Nagayama, Osamu, MD, Sagara, Koichi, MD, Otsuka, Takayuki, MD, Matsuno, Shunsuke, MD, Funada, Ryuichi, MD, Uejima, Tokuhisa, MD, Oikawa, Yuji, MD, Yajima, Junji, MD, Nagashima, Kazuyuki, MD, Kirigaya, Hajime, MD, Sawada, Hitoshi, MD, FJCC, Aizawa, Tadanori, MD, FJCC, Yamashita, Takeshi, MD, FJCC

“…Summary Background The presence of heart failure (HF) with preserved ejection fraction (HFPEF) is increasingly recognized. However, prognostic factors for…”
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Abnormal End-Tidal PO2 and PCO2 at the Anaerobic Threshold Correlate Well With Impaired Exercise Gas Exchange in Patients With Left Ventricular Dysfunction by Kano, Hiroto, Koike, Akira, Hoshimoto-Iwamoto, Masayo, Nagayama, Osamu, Sakurada, Koji, Suzuki, Takeya, Tsuneoka, Hidekazu, Sawada, Hitoshi, Aizawa, Tadanori, Wasserman, Karlman

“…Background: The aim of the present study was to compare the end-tidal O2 pressure (PETO2) to end-tidal CO2 pressure (PETCO2) in cardiac patients during rest…”
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Prognostic Value of Cardiopulmonary Exercise Testing in Cardiac Patients With Atrial Fibrillation by Tsuneoka, Hidekazu, Koike, Akira, Nagayama, Osamu, Sakurada, Koji, Kato, Jo, Sato, Akira, Yamashita, Takeshi, Aonuma, Kazutaka

“…Parameters obtained from cardiopulmonary exercise testing (CPX) are recognized for their high prognostic value in predicting future cardiac events in cardiac…”
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Clinical Significance of Cerebral Oxygenation During Exercise in Patients With Coronary Artery Disease by Koike, Akira, Nagayama, Osamu, Hoshimoto-Iwamoto, Masayo, Suzuki, Takeya, Tajima, Akihiko, Uejima, Tokuhisa, Aizawa, Tadanori

“…Background Recent investigations have demonstrated that cerebral oxyhemoglobin (O2Hb) decreases during exercise in patients with left ventricular dysfunction,…”
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Critical Level of Cerebral Oxygenation During Exercise in Patients With Left Ventricular Dysfunction by Koike, Akira, Hoshimoto, Masayo, Tajima, Akihiko, Nagayama, Osamu, Yamaguchi, Kaori, Goda, Ayumi, Yamashita, Takeshi, Sagara, Koichi, Itoh, Haruki, Aizawa, Tadanori

“…Background In a recent study the indexes of cerebral oxygenation decreased during maximal exercise in nearly half of all patients with left ventricular…”
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Determination of the VE/VCO2 Slope from a Constant Work-Rate Exercise Test in Cardiac Patients by Hoshimoto-Iwamoto, Masayo, Koike, Akira, Nagayama, Osamu, Tajima, Akihiko, Uejima, Tokuhisa, Adachi, Hiromasa, Aizawa, Tadanori, Wasserman, Karlman

“…Incremental exercise testing to a symptom-limited maximum has been used to measure the ratio of the increase in ventilation (VE) to the increase in CO2 output…”
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Influence of Cerebrovascular Arteriosclerosis on Cerebral Oxygenation During Exercise by Nagayama, Osamu, Koike, Akira, Hoshimoto, Masayo, Yamaguchi, Kaori, Tajima, Akihiko, Goda, Ayumi, Uejima, Tokuhisa, Itoh, Haruki, Aizawa, Tadanori

“…Background Although it is assumed that cerebral oxygenation during exercise is influenced by both cardiopulmonary function and cerebrovascular…”
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Effects of Supplemental O2 Inhalation on Cerebral Oxygenation During Exercise in Patients With Left Ventricular Dysfunction by Koike, Akira, Nagayama, Osamu, Goda, Ayumi, Hoshimoto, Masayo, Yamaguchi, Kaori, Tajima, Akihiko, Uejima, Tokuhisa, Itoh, Haruki, Aizawa, Tadanori

“…Background It has been recently reported that cerebral oxyhemoglobin (O2Hb) decreases during exercise in nearly 50% of patients with dilated cardiomyopathy…”
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Prognostic Value of Heart Rate Profiles During Cardiopulmonary Exercise Testing in Patients With Cardiac Disease by Goda, Ayumi, Koike, Akira, Iwamoto, Masayo Hoshimoto, Nagayama, Osamu, Yamaguchi, Kaori, Tajima, Akihiko, Sawada, Hitoshi, Itoh, Haruki, Isobe, Mitsuaki, Aizawa, Tadanori

“…Earlier studies have demonstrated that an impaired capacity to increase heart rate (HR) and a slowed HR recovery following exercise are both associated with…”
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Overshoot phenomenon of oxygen uptake during recovery from maximal exercise in patients with previous myocardial infarction by Nagayama, Osamu, Koike, Akira, Suzuki, Takeya, Hoshimoto-Iwamoto, Masayo, Sawada, Hitoshi, Aizawa, Tadanori

“…The overshoot in oxygen uptake (VO2 overshoot) during recovery from maximal exercise is thought to reflect an overshoot in cardiac output. We investigated…”
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Prognostic value of end-tidal CO2 pressure during exercise in patients with left ventricular dysfunction by Hoshimoto-Iwamoto, Masayo, Koike, Akira, Nagayama, Osamu, Tajima, Akihiko, Suzuki, Takeya, Uejima, Tokuhisa, Sawada, Hitoshi, Aizawa, Tadanori

“…We compared the prognostic power of end-tidal CO(2) pressure (PETCO(2)) during exercise, an index of arterial CO(2) pressure, with those of established…”
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Does the Severity of Central Sleep Apnea Correlate With Respiratory Gas Indexes During Cardiopulmonary Exercise Testing? by Koike, Akira, Nagayama, Osamu, Goda, Ayumi, Yamaguchi, Kaori, Tajima, Akihiko, Uejima, Tokuhisa, Itoh, Haruki, Aizawa, Tadanori

“…Central sleep apnea (CSA) is thought to arise as a consequence of chronic heart failure. We have attempted to determine the relationship between the severity…”
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High Diastolic Blood Pressure During Exercise Is Associated With Hypercholesterolemia in Patients With Coronary Artery Disease by Kubozono, Takuro, Koike, Akira, Nagayama, Osamu, Tajima, Akihiko, Aizawa, Tadanori, Fu, Long Tai, Itoh, Haruki

“…Evaluating blood pressure response during exercise rather than during rest might better detect a subtle impairment in relaxation of the resistance vessel in…”
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