Tanaka, Karin

写真a

Affiliation

School of Medicine, Center for Preventive Medicine (Shinanomachi)

Position

Instructor
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Papers 【 Display / hide 】

  • Impact of coronavirus disease 2019 in seasonal variation of hemoglobin A1c in adults with type 1 diabetes and the effect of the mode of treatment: a single-center retrospective study for 2019 and 2021 and analysis by the mode of treatment

    Tanaka K., Meguro S., Itoh A., Kodani N., Itoh H.

    Endocrine Journal (Endocrine Journal)  70 ( 8 ) 787 - 795 2023

    ISSN  09188959

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    The study was aimed to investigate the seasonal variation of hemoglobin A1c (HbA1c) in adults with type 1 diabetes (T1D) and the impact of coronavirus disease 2019 (COVID-19) by comparing 2019 and 2021 data and differences in treatment modes. This was a single-center retrospective observational study including 52 adult patients with T1D who regularly visited hospital in 2019 and 2021. Twenty-five patients used multiple daily injections (MDI)/self-measurement of blood glucose (SMBG), 16 used MDI/intermittently scanned continuous glucose monitoring (isCGM), 9 used sensor-augmented pump (SAP), and 2 used continuous subcutaneous insulin infusion (CSII)/isCGM. The mean HbA1c level was calculated for each month. The correlation between monthly means of temperature and HbA1c was investigated. Similar analyses were performed for the MDI/SMBG, MDI/isCGM, and SAP + CSII/isCGM groups. HbA1c levels in 2019 decreased in summer and increased in winter and showed a significant negative correlation with temperature (r = –0.652, p = 0.022). However, HbA1c in 2021 showed no seasonal variation and no correlation with temperature (r = –0.134, p = 0.678) and tended to decline after the three emergency declarations. HbA1c in the MDI/SMBG group showed the same trend as the whole group in 2019 and 2021. However, the effect of seasonal variation in HbA1c was lower in the MDI/isCGM group and the lowest in the SAP + CSII/isCGM group in 2019. The impact of emergency declaration on HbA1c level was small for the MDI/isCGM group and smaller for the SAP + CSII/isCGM group in 2021. The COVID-19 pandemic has affected the seasonal variation of HbA1c levels in T1D; the variation differed according to the treatment mode.

  • Difference of seasonal variation between glycated albumin and glycated haemoglobin

    Tanaka Karin, Meguro Shu, Tanaka Masami, Irie Junichiro, Saisho Yoshifumi, Itoh Hiroshi.

    Annals of Clinical Biochemistry  55 ( 5 ) 583 - 587 2018.09

    Research paper (scientific journal)

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    Abstract
    Background
    Glycated albumin reflects 2–3-week glycaemic controls, and in addition to glycated haemoglobin, it has been used as a glycaemic control indicator. We presumed that glycated albumin also has seasonal variations and is related to temperature, similar to glycated haemoglobin.
    Methods
    The subjects were diabetic outpatients from April 2007 to March 2013. This resulted in the enrolment of 2246 subjects and the collection of a total of 53,968 measurements. Mean glycated haemoglobin, glycated albumin, and plasma glucose were calculated for each month over six years. The associations of the measures with each other and the average temperature for each month in Tokyo were assessed using Spearman rank correlation coefficients.
    Results
    Plasma glucose was highest in January and lowest in May. Glycated haemoglobin was highest in March and lowest in September. Glycated albumin was highest in May and lowest in December. Glycated albumin tended to have a disjunction with plasma glucose in winter. Glycated haemoglobin had seasonal variation, but glycated albumin did not. Plasma glucose and glycated haemoglobin showed significant negative correlations with temperature (rs = −0.359, P < 0.001, rs = −0.449, P < 0.001, respectively), but glycated albumin did not. However, glycated albumin was inter-correlated with plasma glucose (rs = 0.396, P < 0.001) and glycated haemoglobin (rs = 0.685, P < 0.001), and glycated haemoglobin was inter-correlated with plasma glucose (rs = 0.465, P < 0.001).
    Conclusion
    Glycated albumin and glycated haemoglobin showed different seasonal variations from each other over the six-year study period. Thus, further studies to identify factors that contribute to glycated albumin are needed.

  • C-peptide immunoreactivity index is associated with improvement of HbA1c

    Nishimura Takeshi, Meguro Shu, Sekioka Risa, Tanaka Karin, Saisho Yoshifumi, Irie Junichiro, Tanaka Masami, Kawai Toshihide, Itoh Hiroshi

    Diabetes Research and Clinical Practice 108 ( 3 ) 441 - 447 2015.06

    ISSN  0168-8227

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    <p>Aims: This retrospective study aimed to determine the hypoglycaemic effect of 2 years of sitagliptin administration in terms of changes in HbA1c and C-peptide immunoreactivity (CPR) index (plasma CPR [ng/mL]/glucose [mg/dL]. ×. 100). Methods: The inclusion criteria for DPP-4 inhibitor-naive outpatients with type 2 diabetes (. n=. 285) were: continuation of sitagliptin for ≥700 days from initial administration and measurement of HbA1c, serum CPR, and plasma glucose levels at 0, 3, 6, 12, 18, and 24 months after sitagliptin initiation. Logistic regression analyses determined the factors contributing to the response to sitagliptin, based on responder (δHbA1c ≤-0.4% [≤-4. mmol/mol]) and non-responder (δHbA1c &gt;-0.4% [&gt;-4. mmol/mol]) groups. Results: The HbA1c level decreased and CPR index increased from baseline to 3, 6, 12, 18, and 24 months after the start of sitagliptin administration (HbA1c: 7.4. ±. 0.8% [57. ±. 9. mmol/mol], 7.3. ±. 0.9% [57. ±. 9. mmol/mol], 7.4. ±. 0.9% [58. ±. 10. mmol/mol], 7.1. ±. 0.8% [55. ±. 9. mmol/mol], and 7.3. ±. 0.9% [57. ±. 10. mmol/mol], respectively, all P&lt;. 0.001 vs. baseline [8.0. ±. 1.0%, 64. ±. 11. mmol/mol] and CPR index: 1.69. ±. 0.96, 1.71. ±. 1.10, 1.62. ±. 0.96, 1.64. ±. 0.92, and 1.66. ±. 0.96, respectively, all P&lt;. 0.05 vs. baseline [1.47. ±. 0.81]). Higher baseline HbA1c level, shorter diabetes duration, and greater CPR index increase after sitagliptin administration were associated with the response to sitagliptin. Conclusions: Our results suggest that sitagliptin improves glycaemic control via an improved intrinsic insulin response.</p>

  • Past obesity as well as present body weight status is a risk factor for diabetic nephropathy

    Meguro Shu, Kabeya Yusuke, Tanaka Karin, Kawai Toshihide, Tomita Masuomi, Katsuki Takeshi, Oikawa Yoichi, Atsumi Yoshihito, Shimada Akira, Tanaka Masami, Irie Junichiro, Saisho Yoshifumi, Itoh Hiroshi

    International Journal of Endocrinology 2013 2013

    ISSN  1687-8337

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    <p>Aims. We analyzed the prevalence of nephropathy according to past body weight status in Japanese subjects with type 2 diabetes because the influence of past obesity on diabetic complications is not certain. Methods. We examined the prevalence of nephropathy in 2927 subjects with type 2 diabetes mellitus according to current BMI and maximum BMI in the past. We defined "current obesity" as BMI on hospitalization of 25 or more, "previous obesity" as BMI on hospitalization of less than 25 and self-reported maximum BMI in the past of 25 or more, and "continuously lean" as maximum BMI of less than 25. Results. The prevalence of nephropathy was significantly higher in subjects with current obesity (40.6%) or previous obesity (35.6%) than in those who were continuously lean (24.3%) (P&lt;0.017). In logistic regression analysis, previous obesity, as well as current obesity, was a significant risk factor for nephropathy, independent of sex, age, disease duration, hypertension, dyslipidemia, HbA1c, and diabetic retinopathy. Conclusions. Obesity in the past, as well as the present body weight status, was a risk factor for diabetic nephropathy. © 2013 Shu Meguro et al.</p>

  • Successful treatment of recurrent intracardiac thrombus in Behçet's disease with immunosuppressive therapy

    Kaneko Yuko, Tanaka Karin, Yoshizawa Akihiro, Yasuoka Hidekata, Suwa Akira, Satoh Toru, Iwanaga Shiro, Ogawa Satoshi, Ikeda Yasuo, Hirakata Michito

    Clinical and Experimental Rheumatology 23 ( 6 ) 885 - 887 2005.11

    ISSN  0392-856X

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    <p>Behçet's disease (BD) is a chronic multisystem inflammatory disorder characterized by recurrent oral and genital ulcers, skin eruptions and uveitis. Neurological, gastrointestinal, and musculoskeletal systems are also involved. Although venous and arterial vasculitis occur in up to one-third of patients, intracardiac thrombus is a very rare complication. We herein report the case of a 46-year-old man with BD who presented with a large right atrial thrombus. Within a month after surgical removal, the thrombus recurred and was successfully treated with immunosuppressants that included prednisolone and cyclophosphamide. © Copyright Clinical and Experimental Rheumatology 2005.</p>

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Presentations 【 Display / hide 】

  • グリコアルブミンとHbA1cの季節変動の違い

    Tanaka Karin

    European Association for the Study of Diabetes (barcelona) , 

    2013.09
    , 

    Poster presentation

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