Masaru Yamakawa

Kobe City Medical Center General Hospital, Kōbe, Hyōgo, Japan

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Publications (11)12.78 Total impact

  • Tatsuji Hoshino · Masato Kita · Yukihiro Imai · Masaru Yamakawa
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    ABSTRACT: Congenital toxoplasmosis is caused by Toxoplasma gondii. The incidence of death due to congenital toxoplasmosis in Japan from 1974 to 2007 was calculated using the autopsy database of the Japanese Society of Pathology and vital statistics from the Ministry of Health, Labour and Welfare. Two neonatal deaths due to congenital toxoplasmosis were reported during that time. As there were 161 195 neonatal deaths during this period and 32 465 autopsies were performed, the yearly neonatal death from congenital toxoplasmosis was calculated as 2 × 161 195/32 465/34 = 0.29 and the autopsy rate as 32 465/161 195 = 0.2014 (20.14%). The calculated number of annual deaths in infants was 0.82 and in children aged 1–4 years it was 2.09; thus, although few, deaths from congenital toxoplasmosis do still occur in neonates, infants, and young children. Therefore, obstetricians and pediatricians should be aware of the potential for congenital toxoplasmosis, and pregnant women should make every effort to avoid T. gondii infection.
    Pediatrics International 08/2014; 56(4). DOI:10.1111/ped.12386 · 0.73 Impact Factor
  • Pediatrics International 01/2011; 37(6):717 - 725. DOI:10.1111/j.1442-200X.1995.tb03413.x · 0.73 Impact Factor
  • Ryusuke Taba · Masaru Yamakawa · Sayaka Harada · Yoko Yamada
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    ABSTRACT: We report a case of emergent massive meconium peritonitis due to intrauterine volvulus without malrotation. Fetal ascites was detected on a regular ultrasonographic examination, and fetal distress was found on cardiotocographic monitoring. The mother had noticed a slight decrease in fetal movements over the preceding 24 hours. Prenatal magnetic resonance imaging allowed us to distinguish the meconium from fetal peritoneal fluid and to evaluate the degree of compression of the fetal thoracic cavity. The infant was delivered by emergency cesarean section and demonstrated tense abdominal ascites with edema at birth. She required cardiopulmonary resuscitation and immediate paracentesis.
    Advances in Neonatal Care 12/2010; 10(6):307-10. DOI:10.1097/ANC.0b013e3181fe9a2f · 1.12 Impact Factor
  • Ryusuke Taba · Masaru Yamakawa · Chisato Miyakoshi · Yukihiro Imai
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    ABSTRACT: Cholestasis in neonates is infrequently associated with Rh isoimmunization, and usually resolves within a month. The suggested pathophysiology is inspissated bile and hepatocellular damage. We report a rare case of refractory cholestasis presenting with cholangiolitis in a newborn with anti-E isoimmunisation. The cholangiolitis was disclosed by immunohistochemical investigation of conjugated hyperbilirubinaemia and by liver biopsy, which showed a number of CD8(+) lymphocytes within the portal tract damaging the interlobular bile duct. Bilirubin levels dramatically decreased after 14-day corticosteroid therapy (prednisolone, 2 mg/kg/day) implying that the cause of cholestasis could be immune-mediated cholangiolitis.
    Journal of Paediatrics and Child Health 10/2010; 48(3):E126-31. DOI:10.1111/j.1440-1754.2010.01874.x · 1.15 Impact Factor
  • Japanese journal of infectious diseases 12/2008; 61(6):506-7. · 1.16 Impact Factor
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    ABSTRACT: Two pregnancies in a woman on oxygen inhalation therapy before pregnancy, due to pulmonary fibrosis and frequent pneumothorax that are secondary to mixed connective tissue disease, were managed safely. As usual for this condition, the patient was rather older and her ordinary daily life was restricted. This is a truly very rare case of a successful pregnancy in these circumstances. In a published work review using key words such as "pregnancy", "mixed connective tissue disease" and "oxygen inhalation therapy", no similar case could be found. For the management of such high-risk patients, close cooperation of the obstetrician, clinical immunologist, clinical pneumologist and neonatologist in the same hospital is indispensable.
    Journal of Obstetrics and Gynaecology Research 08/2008; 34(4 Pt 2):613-8. DOI:10.1111/j.1447-0756.2008.00895.x · 1.07 Impact Factor
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    ABSTRACT: Initial presentation with only cervical lymphadenopathy and fever is one of the pitfalls in the diagnosis of Kawasaki disease (KD). As the number of such patients is small, their clinical features have remained uncertain. The purpose of the present study is to characterise the features of such KD patients, especially in comparison with those of patients with common onset. We conducted a retrospective review of the medical records of 136 consecutive KD patients admitted to Kobe City General Hospital from April of 2000 to March of 2006. Twenty-nine of the 136 patients initially presented with only cervical lymphadenopathy and fever and were classified into the lymphadenopathy-KD (LKD); they were compared with the remaining 107 KD patients with other presentations (other-KD). Age, days of fever to diagnosis, and duration of fever were significantly higher or longer in LKD patients, who also showed higher C-reactive protein levels and neutrophil alkaline phosphatase activity. There were no significant differences between two groups in gender, duration of hospitalization, frequency of high-dose intravenous immunoglobulin (IVIG) administration, coronary artery lesions (CALs), white blood cell or platelet counts, and levels of hemoglobin or albumin on admission. Although a delay in diagnosis and stronger inflammation were found in LKD patients, such differences did not have any significant effect on patients' outcomes as assessed by the frequency of IVIG administration and the presence of CALs.
    Journal of Paediatrics and Child Health 07/2008; 44(6):359-62. DOI:10.1111/j.1440-1754.2008.01310.x · 1.15 Impact Factor
  • Yasuhiko Tomita · Chisato Miyakoshi · Masaru Yamakawa
    Nippon rinsho. Japanese journal of clinical medicine 09/2007; Suppl 4:620-4.
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    ABSTRACT: To explore clinical protocols for the prevention of early-onset group B Streptococcus (EOGBS) disease of the newborn in Japan, we conducted a multicenter questionnaire survey. Of 32 regional centers participating in the Kyoto Neonatal Study Group, 28 provided usable data concerning prevention practices undertaken between 2000 and 2004. Twenty-three (82%) of the 28 hospitals implemented bacteriological screening to identify maternal GBS carriage, and all 23 hospitals administered intrapartum antibiotics to all screening-positive pregnant women. There were no institutes that used risk-based strategies. In the 23 hospitals, bacteriological screening was conducted mostly by lower vaginal swab alone (n = 18). Eighteen hospitals performed screening once during pregnancy, either before 34 weeks' gestation (n = 6) or between 35 and 37 weeks' gestation (n = 12). Oral antepartum antibiotics, when carriage was identified, were administered at 12 (52%) hospitals. Twenty institutes used penicillins for intrapartum prophylaxis. However, the loading dose for chemoprophylaxis ranged from 0.5 to 2 g, and the interval between repeat administrations ranged from 4 to 12 h. Although the results indicated that more than 80% of the hospitals surveyed had introduced some screening-based prevention practices, the timing of the bacteriological screening during the pregnancy, the number of screenings, and the screening sites, as well as the antibiotics used, and their dosage, varied widely. Because of these highly variable methods, the efficacy of the implementation of preventive practices could not be determined. This study is the first to have described preventive practices for EOGBS disease in Japan in the era of Centers for Disease Control and Prevention guidelines. In light of the above results, a larger study under a unifying protocol would be warranted.
    Journal of Infection and Chemotherapy 03/2007; 13(1):59-62. DOI:10.1007/s10156-006-0487-2 · 1.49 Impact Factor
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    ABSTRACT: Carbamoylphosphate synthetase I deficiency (CPS1D) is a urea-cycle disorder characterized by episodes of life-threatening hyperammonemia. Correct diagnosis is crucial for patient management, but is difficult to make from clinical presentation and conventional laboratory tests alone. Enzymatic or genetic diagnoses have also been hampered by difficult access to the appropriate organ and the large size of the gene (38 exons). In this study, in order to address this diagnostic dilemma, we performed the largest mutational and clinical analyses of this disorder to date in Japan. Mutations in CPS1 were identified in 16 of 18 patients with a clinical diagnosis of CPS1D. In total, 25 different mutations were identified, of which 19 were novel. Interestingly, in contrast to previous reports suggesting an extremely diverse mutational spectrum, 31.8% of the mutations identified in Japanese were common to more than one family. We also identified two common polymorphisms that might be useful for simple linkage analysis in prenatal diagnosis. The accumulated clinical data will also help to reveal the clinical presentation of this rare disorder in Japan.
    Journal of Human Genetics 02/2007; 52(4):349-54. DOI:10.1007/s10038-007-0122-9 · 2.46 Impact Factor
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    ABSTRACT: A case of cerebral infarction in a 4-year-old male is described. The child presented with an acute onset of right hemiplegia, central facial palsy, and dysarthria. He had no predisposing factors for cerebral infarction. A computed tomography scan showed a diffuse low-density area in the territory of the left miiddle cerebral artery. Magnetic resonance angiography disclosed multiple irregular narrowings in the left anterior and middle cerebral arteries. He recovered spontaneously from the stroke with minimal long-term complications, and repeated angiography disclosed a complete regression of the vascular changes 2 months after the stroke. There was no recurrence of stroke after 2-year follow-up. This case demonstrates the importance of longitudinal angiographic follow-up in childhood cerebral infarction of idiopathic origin.
    Journal of Child Neurology 02/2002; 17(1):61-3. DOI:10.1177/088307380201700118 · 1.72 Impact Factor