Mitsugu Kajiura

Osaka Medical College, Takatuki, Ōsaka, Japan

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Publications (12)10.18 Total impact

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    ABSTRACT: To investigate the hypothesis that postmenopausal women demonstrate greater cardiovascular stress reactivity during mental stress tasks than do both premenopausal women and men.
    Psychosomatic medicine. 10/2014;
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    ABSTRACT: Postural tachycardia syndrome (POTS) shows a marked tachycardia while standing. We noticed two forms of circulatory response to orthostatic stress in POTS. We investigated cardiovascular and autonomic nervous response to orthostatic stress in two forms. We studied 79 patients with POTS and 38 healthy control subjects (Ct). Beat-to-beat blood pressure (BP) and heart rate (HR) were noninvasively and continuously measured in the supine and during standing. Autonomic nervous function was evaluated by power spectral analysis of HR variability and diastolic BP variability. We divided the subjects into two groups; standing-induced tachycardia (the SI group, increase in HR≧35 beats/min) and supine tachycardia (the Su group, standing HR≧115 beats/min with standing-induced HR increase <35 beats/min). The Su group had higher supine BP and HR compared with other groups, indicating dominant sympathetic control of the heart in the supine. While uprising, the SI group showed a higher increase in HR than the Ct group, indicating excessive withdrawal of vagal tone. The Su group showed a less increase in HR and a greater decrease of systolic BP and cardiac index by standing compared with the SI group. These results suggest that compensatory mechanisms of sympathetic function during standing failed in the Su group, probably because of exhaustion by a nearly maximal effort to generate sympathetic drive even in the supine with low central blood volume. A balance of resting autonomic function and hemodynamic response to standing are at variance between the two types of POTS.
    Pediatrics International 01/2014; · 0.88 Impact Factor
  • Autonomic Neuroscience 11/2012; 171(s 1–2):91. · 1.85 Impact Factor
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    ABSTRACT: AIM: Postural tachycardia syndrome (POTS) is one of the most frequent forms of chronic orthostatic intolerance in children and adolescents. We examined the influence of a genetic background on POTS. METHODS: We studied 102 children and adolescents with orthostatic dysregulation. The polymorphism of the G protein β3 subunit (GNB3) C825T and G protein α subunit (GNAS1) T131C of genes encoding components of the autonomic nervous system were determined and compared with circulatory responses to active standing. RESULTS: In the GNB3 gene C825T polymorphism, the CT and TT genotype had a significant lower supine heart rate and a larger increase of heart rate by standing than the CC, associated with evaluated power of the high frequency component of heart rate variability. We divided patients into two group; the POTS group (n=48) and the non-POTS group (n=54) according to the Japanese clinical guideline. In GNB3 C825T polymorphism, the TT genotype was more frequently found in the POTS group (45.8%) than in non-POTS group (24.1%) (p=0.036). In the GNAS1 T393C, the genotype frequencies for the T393C polymorphisms of GNA1 did not differ significantly between the groups. CONCLUSION: The gene polymorphisms GNB3 C825T might be a risk factor of POTS through the enhanced vagal withdrawal of the heart in children and adolescents.
    Pediatrics International 08/2012; · 0.88 Impact Factor
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    ABSTRACT: Aim:  To examine the effects of a once-weekly laughter and exercise program on physical and psychological health among elderly people living in the community. As a regular exercise program can be difficult to maintain, we provided a more enjoyable program to enhance adherence to exercise. Methods:  A total of 27 individuals aged 60 years or older, without disabilities, were randomly assigned to either an immediate treatment group (n = 14) or a delayed treatment group (n = 13). The intervention was a 120-min session consisting of laughter and exercise, carried out once a week for 10 consecutive weeks. Measurements taken at baseline, 3 and 6 months included bodyweight, height, body fat, lean mass, bone mineral density, hemoglobin A1c (HbA(1c) ), glucose, high-density lipoprotein and low-density lipoprotein cholesterol, and triglycerides, as well as self-rated health and psychological factors. Results:  All participants completed the 3-month program. Bone mineral density increased significantly in the immediate treatment group compared with the delayed treatment group during the first 3 months (P < 0.001). In addition, HbA(1c) decreased significantly (P = 0.001), and self-rated health increased significantly (P = 0.012). Conclusions:  The combination of a laughter and exercise program might have physiological and psychological health benefits for the elderly. Laughter might be an effective strategy to motivate the elderly to participate in physical activity. Geriatr Gerontol Int 2012; ••: ••-••.
    Geriatrics & Gerontology International 06/2012;
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    ABSTRACT: Matrix metalloproteinase (MMP)-9 is thought to be involved in coronary artery aneurysms (CAAs) in patients with Kawasaki disease (KD); however, MMP-9 inhibitors are not used clinically. This study investigated whether the angiotensin-converting enzyme (ACE) inhibitor captopril could inhibit serum MMP-9 activity using serum from KD patients in an in vitro experiment. In 7 KD patients, serum MMP-9 activity was measured using the MMP-9 assay kit 3 times: before and after intravenous immunoglobulin (IVIG) treatment, and during the convalescent phase. The effect of captopril on MMP-9 activity was also assessed using serum obtained before IVIG treatment. Serum MMP-9 activity was significantly higher during the pre-treatment phase than during the post-treatment and convalescent phases. MMP-9 activity during the pre-treatment phase was dose-dependently inhibited by captopril, and the IC(50) for MMP-9 was 500nM. The potency of captopril for MMP-9 inhibition was comparable to that for ACE inhibition. ACE inhibitor may be effective for preventing CAA formation in KD patients, especially IVIG non-responders.
    Clinica chimica acta; international journal of clinical chemistry 11/2009; 411(3-4):267-9. · 2.54 Impact Factor
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    ABSTRACT: This clinical practice guideline provides recommendations for the assessment, diagnosis and treatment of school-aged children and juveniles with orthostatic dysregulation (OD), usually named orthostatic intolerance in USA and Europe. This guideline is intended for use by primary care clinicians working in primary care settings. The guideline contains the following recommendations for diagnosis of OD: (i) initial evaluation composed of including and excluding criteria, the assessment of no evidence of other disease including cardiac disease and so on; (ii) a new orthostatic test to determine four different subsets: instantaneous orthostatic hypotension, postural tachycardia syndrome, neurally mediated syncope and delayed orthostatic hypotension; (iii) evaluation of severity; and (iv) judgment of psychosocial background with the use of rating scales. The guideline also contains the following recommendations for treatment of OD on the basis of the result of an orthostatic test in addition to psychosocial assessment: (i) guidance and education for parents and children; (ii) non-pharmacological treatments; (iii) contact with school personnel; (iv) use of adrenoceptor stimulants and other medications; (v) strategies of psychosocial intervention; and (vi) psychotherapy. This clinical practice guideline is not intended as a sole source of guidance in the evaluation of children with OD. Rather, it is designed to assist primary care clinicians by providing a framework for decision making of diagnosis and treatments.
    Pediatrics International 03/2009; 51(1):169-79. · 0.88 Impact Factor
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    ABSTRACT: To investigate changes in cerebral blood volume during standing in healthy children with or without abnormal cardiovascular responses. We studied 53 children (age, 10-15 years). Cerebral oxygenated haemoglobin (oxy-Hb) and deoxygenated Hb (deoxy-Hb) were non-invasively and continuously measured using near-infrared spectroscopy (NIRS) (NIRO 300, Hamamatsu Photomedics, Shizuoka, Japan) during active standing. Beat-to-beat arterial pressure was monitored by Portapres. Of 49 children with complete data acquisition, 33 had a normal cardiovascular response to the test (Group I) and 16 showed an abnormal response (Group II); nine with instantaneous orthostatic hypotension, three with postural tachycardia syndrome, three with neutrally mediated syncope and one with delayed orthostatic hypotension. At the onset of standing, Group II showed a significantly larger fall of oxy-Hb than Group I did (-2.9 +/- 2.8 micromol/L vs. -6.4 +/- 7.2 micromol/L, respectively, p < 0.05). During min 1 to 7 of standing, with one exception, changes in oxy-Hb were normally distributed over the level of -4 micromol/L in Group I. Group II also showed a significantly marked decrease in oxy-Hb compared to Group I. Decreases in oxy-Hb were not correlated with blood pressure changes. This study shows that precise change in cerebral blood volume caused by orthostatic stress can be determined by NIRS in children in a quantitative manner of NIRS. Children with abnormal circulatory responses to standing showed a significant reduction of oxy-Hb compared with normal counterparts, suggesting impairment of cerebral autoregulation in these children.
    Acta Paediatrica 03/2009; 98(3):466-71. · 1.97 Impact Factor
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    ABSTRACT: The present investigation is about cardiovascular responses and relevant autonomic function in Swedish and Japanese pubertal children on active standing using non-invasive continuous beat-to-beat finger arterial pressure (FAP) monitoring and power spectral analysis. Examined were 54 Swedish and 57 Japanese children (13-15 years). FAP and heart rate (HR) was continuously recorded in the supine position and during standing. Supine FAP was significantly higher in Swedish compared with Japanese children (121/62 versus 103/53 mmHg, P < 0.001). Swedish children showed a higher increase in arterial pressure and HR upon uprising, resulting in a higher vasoconstrictor index (5.04 +/- 0.22 versus 2.31 +/- 0.11 mmHg s(-1), P < 0.001, respectively). There were also higher increases in arterial pressure and HR in the following steady state period (1-7 min) between the two groups. These differences were also found after adjustment of body weight and height. Frequency domain analysis of HR and arterial pressure variability indicated significantly higher low/high frequency power of HR and low frequency power of arterial pressure. These results suggest that Swedish pubertal children have higher basal blood pressure and enhanced cardiovascular sympathetic responses. These differences in the two cohorts might be caused by genetic factors.
    Clinical physiology and functional imaging 05/2008; 28(3):174-81. · 1.20 Impact Factor
  • Autonomic Neuroscience-basic & Clinical - AUTON NEUROSCI-BASIC CLIN. 01/2007; 135(1):150-150.
  • Autonomic Neuroscience-basic & Clinical - AUTON NEUROSCI-BASIC CLIN. 01/2007; 135(1):45-45.
  • Autonomic Neuroscience-basic & Clinical - AUTON NEUROSCI-BASIC CLIN. 01/2006; 130(1):62-62.