Suguru Machida

Dokkyo Medical University, Tochigi, Tochigi-ken, Japan

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Publications (4)8 Total impact

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    ABSTRACT: An oxygen concentrator that can be powered by a car battery was clinically evaluated. The oxygen concentrator was used on a 67-year-old man with sequelae of pulmonary tuberculosis who was receiving long-term home oxygen therapy (HOT) after long-term use of 4.7 years. His work required automobile trips over long distances. The equipment used was an adsorption-type oxygen concentrator capable of operating on a DC 12 V power supply, which could be powered from a residential power outlet (AC 100 V) using a dedicated voltage converter. Using this equipment, he was capable of driving himself in comfort for 2 hours or longer, over a period of 4 years. Furthermore, it was possible to stay in a hotel during a trip, inhaling oxygen generated by the equipment. Hereafter, this equipment should enable or facilitate long-distance driving, travel and lodging for HOT patients.
    Geriatrics & Gerontology International 07/2002; 2(2):110 - 114.
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    ABSTRACT: Vascular endothelial growth factor (VEGF) is an angiogenesis factor closely associated with the growth and metastasis of malignant tumours. In the present study, we measured plasma VEGF levels in 20 normal subjects (N), 35 patients with benign lung diseases (B), 28 patients with untreated advanced lung cancer (NT) and 10 patients with treated lung cancer (T). In addition, we measured the VEGF levels in pleural effusions from five patients with primary lung cancer and two patients with active infectious diseases. Vascular endothelial growth factor was measured by ELISA. The mean (+/-SD) plasma VEGF level in NT patients (160.8 +/- 177.4 pg/mL) was fivefold higher than that in other patient groups (T, 17.7 +/- 4.9 pg/mL; B, 28.3 +/- 17.6 pg/mL) and the N group (14.9 +/- 7.0 pg/mL; P < 0.01). Vascular endothelial growth factor from lung cancer pleural effusions (17 526.0 +/- 22 498.2 pg/mL) was 25-fold higher than that from patients with active infectious diseases (665.5 +/- 259.0 pg/mL). Plasma VEGF may be a good clinical indicator for the assessment of primary lung cancer and pleural effusion VEGF in primary lung cancer is higher than pleural effusion VEGF in patients with inflammatory diseases.
    Respirology 06/2002; 7(2):93-8. · 2.78 Impact Factor
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    ABSTRACT: The role of leukocytes (WBCs) and platelets (PLTs) in the pulmonary circulation may be important in the development of monocrotaline (MCT)-induced pulmonary hypertension in rats. We investigated the suppressive effects of long-term prostaglandin E(1) (PGE(1)) aerosol on the changes in WBCs and PLTs in the peripheral blood and the pulmonary microvasculature during the development of chronic pulmonary hypertension in MCT rats by real-time confocal scanning laser microscopy. The number of WBCs and PLTs in peripheral blood did not significantly change by inhalation of PGE(1). The number of WBCs and PLTs sequestered in the pulmonary microvasculature of rats subjected PGE(1) inhalation immediately after MCT injection rats with (MCT plus PGE(1) inhalation) significantly decreased from 1 to 4 weeks compared to rats not subjected to PGE(1) inhalation (p < 0.01). The pulmonary systolic arterial pressure and the weight ratio of the right ventricle to the intraventricular septum plus the left ventricle (RV/IVS + LV weight ratio or RV weight ratio) in rats with MCT plus PGE(1) inhalation significantly decreased compared to rats not subjected to PGE(1) inhalation (p < 0.01). The levels of peripheral CD62L-positive WBCs in rats with MCT plus PGE(1) inhalation significantly decreased from 1 to 2 weeks compared to rats not subjected to PGE(1) inhalation, but the levels of peripheral CD18 and CD49d-positive WBCs did not significantly change. We conclude that long-term inhalation of PGE(1) is a very useful therapy in chronic pulmonary hypertension, and the mechanism of suppressing pulmonary hypertension is associated with suppressive effects on sequestered WBCs, especially CD62-positive WBCs and PLTs in the pulmonary microvasculature.
    Journal of Vascular Research 01/2002; 39(1):83-7. · 2.43 Impact Factor
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    ABSTRACT: Intravascular ultrasound has the unique ability to provide cross-sectional images of the arterial wall. This study examined intravascular ultrasound (IVUS) images of the proximal pulmonary arteries in primary pulmonary hypertension (PPH). Study 1: Specimens from four patients who had died of PPH (in vitro PPH group) were compared with those of three patients who had died of subarachnoid haemorrhage but had no evidence of cardiopulmonary disease (in vitro control group). Three-centimetre segments of the following levels were examined by IVUS: pulmonary trunk, eight secondary branch arteries of the upper, middle, and lower lobes of both lungs, and the thoracic descending aorta. Study 2: Four patients with PPH (in vivo PPH group) and five patients without pulmonary hypertension and no evidence of cardiopulmonary disease (in vivo control group) were examined. The IVUS images of the apical segmental artery of the right upper lobe and the descending branch of the right pulmonary artery were studied. Echographic examination of formalin-fixed preparations of secondary branch sections of the pulmonary artery failed to show a clear three-layer structure in the in vitro control group (24 preparations), but a distinct three-layer structure and increased vessel wall thickness were observed in the in vitro PPH group (32 preparations). Similar findings were obtained in the in vivo study. The mean echo density of the proximal pulmonary arterial wall correlated well with the mean pulmonary arterial pressure (mPA) in the in vitro PPH, and also correlated with the mPA in the in vivo study (r = 0.960, P < 0.0001). The echo intensity of secondary branch sections of the pulmonary artery was higher in the in vitro PPH group than in the in vitro control group (180.5 +/- 27.0 vs 132.5 +/- 26.7 counts, P < 0.001); similar results were obtained in the in vivo study (144.7 +/- 23.4 vs 85.0 +/- 14.3 counts, P < 0.01). These results suggest that the histological changes detected in the pulmonary artery walls in the PPH group were responsible for the increased echo intensity.
    Respirology 04/2000; 5(1):71-8. · 2.78 Impact Factor