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Lu Z, Li Y. New Clues to Cardiovascular Disease: Erythrocyte Lifespan. Aging Dis 2023; 14:2003-2014. [PMID: 37199588 PMCID: PMC10676783 DOI: 10.14336/ad.2023.0506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Accepted: 05/06/2023] [Indexed: 05/19/2023] Open
Abstract
Determination of erythrocyte lifespan is an important part of the diagnosis of hemolytic diseases. Recent studies have revealed alterations in erythrocyte lifespan among patients with various cardiovascular diseases, including atherosclerotic coronary heart disease, hypertension, and heart failure. This review summarizes the progress of research on erythrocyte lifespan in cardiovascular diseases.
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Affiliation(s)
- Ziyu Lu
- Department of Cardiology, the Second Affiliated Hospital, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, China
| | - Yuanmin Li
- Department of Cardiology, the Second Affiliated Hospital, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, China
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2
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Lauridsen KM, Støy J, Winther-Larsen A, Abildgaard A. Deceived by Elevated A1C: Cases of Misdiagnosed Diabetes. Clin Diabetes 2023; 42:150-155. [PMID: 38230327 PMCID: PMC10788644 DOI: 10.2337/cd23-0043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Affiliation(s)
- Kasper Munch Lauridsen
- Steno Diabetes Center Aarhus, Aarhus University Hospital, Aarhus, Denmark
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Julie Støy
- Steno Diabetes Center Aarhus, Aarhus University Hospital, Aarhus, Denmark
| | - Anne Winther-Larsen
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Clinical Chemistry, Aarhus University Hospital, Aarhus, Denmark
| | - Anders Abildgaard
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Clinical Chemistry, Aarhus University Hospital, Aarhus, Denmark
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Koga M, Kameyama M, Okumiya T. Estimation of mean erythrocyte age using HbA1c or HbA1c/glycated albumin for evaluation of anemia severity. J Clin Lab Anal 2023; 37:e24947. [PMID: 37518970 PMCID: PMC10492451 DOI: 10.1002/jcla.24947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 04/02/2023] [Accepted: 07/11/2023] [Indexed: 08/01/2023] Open
Abstract
BACKGROUND Hemoglobin A1c (HbA1c) levels are low in patients with hemolytic anemia, as HbA1c reflects mean erythrocyte age (MRBC ). Erythrocyte creatine (EC) is a hemolytic indicator that also reflects MRBC . We previously reported an equation for estimating MRBC using EC (EC-MRBC ). AIMS In this study, EC-MRBC was compared to the HbA1c level expressed in the International Federation of Clinical Chemistry and Laboratory Medicine units (iA1c) and to the iA1c/glycated albumin (GA) ratio to estimate MRBC . METHODS This study included 238 subjects, including patients with hemolytic anemia and/or type 2 diabetes mellitus (T2DM). RESULTS In non-diabetic individuals, both iA1c and iA1c/GA showed a strong positive correlation with EC-MRBC (p < 0.0001). The equations to estimate iA1c-MRBC and iA1c/GA-MRBC derived from the regression equations between EC-MRBC and iA1c, and EC-MRBC and iA1c/GA in nondiabetic individuals were 1.45 × iA1c and 20.0 × iA1c/GA, respectively. iA1c-MRBC and iA1c/GA-MRBC in non-diabetic individuals without hemolytic anemia were 57.6 ± 4.0 and 57.1 ± 6.4 days, respectively, and iA1c/GA-MRBC in T2DM patients without hemolytic anemia was 56.0 ± 8.8 days.; no significant difference was seen in the comparisons. CONCLUSIONS The MRBC can be estimated using iA1c or iA1c/GA in non-diabetic individuals, and iA1c/GA in T2DM patients.
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Affiliation(s)
- Masafumi Koga
- Department of Internal MedicineHakuhokai Central HospitalAmagasakiJapan
| | - Masahi Kameyama
- Research Team for NeuroimagingTokyo Metropolitan Institute for Geriatrics and GerontologyTokyoJapan
| | - Toshika Okumiya
- Department of Medical Laboratory Science, Faculty of Health SciencesKochi Gakuen UniversityKochiJapan
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Wang J, Zhang L, bai Y, Wang X, Wang W, Li J, Zhou S. The influence of shorter red blood cell lifespan on the rate of HbA1c target achieved in type 2 diabetes patients with a HbA1c detection value lower than 7. J Diabetes 2023; 15:7-14. [PMID: 36541364 PMCID: PMC9870739 DOI: 10.1111/1753-0407.13345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 10/14/2022] [Accepted: 12/01/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Variations in the red blood cell (RBC) lifespan can affect glycosylated hemoglobin (HbA1c) test values, but there is still a lack of evidence regarding how and to what degree the RBC lifespan influences HbA1c in the type 2 diabetes mellitus (T2DM) population owing to the restriction of traditional RBC lifespan-detection means. This study aimed to investigate the influence of RBC lifespan variation on HbA1c values in T2DM patients with a HbA1c detection value lower than 7%. METHODS Patients with HbA1c <7% were divided into two groups: RBC lifespan <90 days and RBC lifespan ≥90 days. We collected blood glucose levels at seven time points for three consecutive months, assessed the HbA1c and glycosylated albumin levels, and calculated the hemoglobin glycation index (HGI) for each patient. RESULTS There were no statistical differences in the HbA1c value between two groups, but the estimated glycosylated hemoglobin (eHbA1c) was significantly higher in patients with an RBC lifespan <90 days. The proportion of the eHbA1c ≥7% in the group with an RBC lifespan <90 days was significantly higher than the other group (33.87% vs. 12.50%, p < .01). Pearson analysis showed a significant negative correlation between RBC lifespan and the HGI in patients with T2DM (r = -0.348, p < .01). CONCLUSION A reduced RBC lifespan in T2DM patients caused a noticeable underestimate of the blood glucose levels as presented by HbA1c detection value.
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Affiliation(s)
- Junmei Wang
- NHC Key Laboratory of Hormones and DevelopmentChu Hsien‐I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical UniversityTianjinChina
- Tianjin Key Laboratory of Metabolic DiseasesTianjin Medical UniversityTianjinChina
| | - Li Zhang
- NHC Key Laboratory of Hormones and DevelopmentChu Hsien‐I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical UniversityTianjinChina
- Tianjin Key Laboratory of Metabolic DiseasesTianjin Medical UniversityTianjinChina
| | - Yu bai
- NHC Key Laboratory of Hormones and DevelopmentChu Hsien‐I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical UniversityTianjinChina
- Tianjin Key Laboratory of Metabolic DiseasesTianjin Medical UniversityTianjinChina
| | - Xinli Wang
- NHC Key Laboratory of Hormones and DevelopmentChu Hsien‐I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical UniversityTianjinChina
- Tianjin Key Laboratory of Metabolic DiseasesTianjin Medical UniversityTianjinChina
| | - Weilin Wang
- NHC Key Laboratory of Hormones and DevelopmentChu Hsien‐I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical UniversityTianjinChina
- Tianjin Key Laboratory of Metabolic DiseasesTianjin Medical UniversityTianjinChina
| | - Jing Li
- NHC Key Laboratory of Hormones and DevelopmentChu Hsien‐I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical UniversityTianjinChina
- Tianjin Key Laboratory of Metabolic DiseasesTianjin Medical UniversityTianjinChina
| | - Saijun Zhou
- NHC Key Laboratory of Hormones and DevelopmentChu Hsien‐I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical UniversityTianjinChina
- Tianjin Key Laboratory of Metabolic DiseasesTianjin Medical UniversityTianjinChina
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Red Blood Cell Lifespan < 74 Days Can Clinically Reduce Hb1Ac Levels in Type 2 Diabetes. J Pers Med 2022; 12:jpm12101738. [PMID: 36294877 PMCID: PMC9604792 DOI: 10.3390/jpm12101738] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 10/10/2022] [Accepted: 10/13/2022] [Indexed: 11/24/2022] Open
Abstract
Variations in the red blood cell (RBC) lifespan can affect glycosylated hemoglobin (HbA1c) test values, but there is still a lack of evidence regarding how and to what degree the RBC lifespan influences HbA1c in the type 2 diabetes mellitus (T2DM) population owing to the restriction of traditional RBC lifespan detection means. In this study, we monitored 464 T2DM patients and 231 healthy control finger blood glucose levels at seven time points for three consecutive months. The HbA1c levels were assessed at the end of the third month as well as the RBC lifespan was measured through the CO breath test. T2DM patients were stratified into four quartile groups according to their RBC lifespans. There was no statistical significance in HbA1c among these four groups. However, the average blood glucose in the Q1 group was significantly higher than those in the other groups. Additionally, the contribution of RBC lifespan to HbA1c test value in the Q1 group was 14.07%, which was significantly higher than those in the other groups. Finally, we used multiple linear regression models to construct a mathematical formula to correct the HbA1c test value in the Q1 group, which would benefit the management of T2DM.
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Xu Y, Bergenstal RM, Dunn TC, Ajjan RA. Addressing shortfalls of laboratory HbA 1c using a model that incorporates red cell lifespan. eLife 2021; 10:69456. [PMID: 34515636 PMCID: PMC8437432 DOI: 10.7554/elife.69456] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 08/24/2021] [Indexed: 12/19/2022] Open
Abstract
Laboratory HbA1c does not always predict diabetes complications and our aim was to establish a glycaemic measure that better reflects intracellular glucose exposure in organs susceptible to complications. Six months of continuous glucose monitoring data and concurrent laboratory HbA1c were evaluated from 51 type 1 diabetes (T1D) and 80 type 2 diabetes (T2D) patients. Red blood cell (RBC) lifespan was estimated using a kinetic model of glucose and HbA1c, allowing the calculation of person-specific adjusted HbA1c (aHbA1c). Median (IQR) RBC lifespan was 100 (86–102) and 100 (83–101) days in T1D and T2D, respectively. The median (IQR) absolute difference between aHbA1c and laboratory HbA1c was 3.9 (3.0–14.3) mmol/mol [0.4 (0.3–1.3%)] in T1D and 5.3 (4.1–22.5) mmol/mol [0.5 (0.4–2.0%)] in T2D. aHbA1c and laboratory HbA1c showed clinically relevant differences. This suggests that the widely used measurement of HbA1c can underestimate or overestimate diabetes complication risks, which may have future clinical implications.
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Affiliation(s)
- Yongjin Xu
- Abbott Diabetes Care, Alameda, United States
| | - Richard M Bergenstal
- International Diabetes Center, Park Nicollet, HealthPartners, Minneapolis, United States
| | | | - Ramzi A Ajjan
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, United Kingdom
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He D, Kuang W, Yang X, Xu M. Association of hemoglobin H (HbH) disease with hemoglobin A 1c and glycated albumin in diabetic and non-diabetic patients. Clin Chem Lab Med 2021; 59:1127-1132. [PMID: 33554549 DOI: 10.1515/cclm-2020-1563] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Accepted: 12/15/2020] [Indexed: 11/15/2022]
Abstract
OBJECTIVES Hemoglobin A1c (HbA1c) and glycated albumin (GA) are glycemic control status indicators in patients with diabetes mellitus. Hemoglobin H (HbH) disease is a moderately severe form of α-thalassemia. Here we examine the usefulness of HbA1c and GA in monitoring glycemic control in patients with HbH disease. METHODS HbA1c, GA, and an oral glucose tolerance test were performed in 85 patients with HbH disease and 130 healthy adults. HbA1c was measured using five methods, including two systems based on cation-exchange high-performance liquid chromatography (Variant II Turbo 2.0 and Bio-Rad D100), a capillary zone electrophoresis method (Capillarys 3 TERA), a boronate affinity HPLC method (Premier Hb9210), and an immunoassay (Cobas c501). RESULTS Significant lower levels of HbA1c were observed in patients with HbH disease than in healthy adults. In contrast, GA showed no statistically significant differences between participants with and without HbH disease. A considerable number of diabetic patients with HbH disease would be missed if using HbA1c as a diagnostic criterion for diabetes mellitus. CONCLUSIONS GA but not HbA1c is suitable for monitoring glycemic control in patients with HbH disease that can modify the discriminative ability of HbA1c for diagnosing diabetes.
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Affiliation(s)
- Dabao He
- Department of Laboratory Medicine, Shenzhen Longhua District Central Hospital, Shenzhen, Guangdong, P.R. China
| | - Wenbin Kuang
- Department of Laboratory Medicine, Shenzhen Longhua District Central Hospital, Shenzhen, Guangdong, P.R. China
| | - Xiaoling Yang
- Department of Laboratory Medicine, Shenzhen Baoan District Songgang People's Hospital, Shenzhen, Guangdong, P.R. China
| | - Miao Xu
- Department of Laboratory Medicine, Weifang People's Hospital, Weifang, Shandong, P.R. China
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Chrzanowski J, Michalak A, Łosiewicz A, Kuśmierczyk H, Mianowska B, Szadkowska A, Fendler W. Improved Estimation of Glycated Hemoglobin from Continuous Glucose Monitoring and Past Glycated Hemoglobin Data. Diabetes Technol Ther 2021; 23:293-305. [PMID: 33112161 DOI: 10.1089/dia.2020.0433] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Background: Accurate estimation of glycated hemoglobin (HbA1c) from continuous glucose monitoring (CGM) remains challenging in clinic. We propose two statistical models and validate them in real-life conditions against the current standard, glucose management indicator (GMI). Materials and Methods: Modeling utilized routinely collected data from patients with type 1 diabetes from central Poland (eligibility criteria: age >1 year, diabetes duration >3 months, and CGM use between 01/01/2015 and 12/31/2019). CGM records were extracted from dedicated Medtronic/Abbott databases and cross-referenced with HbA1c values; 28-day periods preceding HbA1c measurement with >75% of the sensor-active time were analyzed. We developed a mixed linear regression, including glycemic variability indices and patient's ID (glucose variability-based patient specific model, GV-PS) intended for closed-group use and linear regression using patient-specific error of GMI (proportional error-based patient agnostic model, PE-PA) for general use. Models were validated with either new HbA1cs from closed-group patients or separate patient-HbA1c pool. External validation was performed with data from clinical trials. Performance metrics included bias, its 95% confidence interval (95% CI), coefficient of determination (R2), and root mean square error (RMSE). Results: We included 723 HbA1c-CGM pairs from 174 patients (mean age 9.9 ± 4.4 years and diabetes duration 3.7 ± 3.6 years). GMI yielded R2 = 0.58, with different bias between Medtronic and Abbott devices [0.120% vs. -0.152%, P < 0.0001], and overall 95% CI = -0.9% to +1%, RMSE = 0.47%. GV-PS successfully captured patient-specific variance (closed-group validation: R2 = 0.83, bias = 0.026%, 95% CI = -0.562% to 0.591%, RMSE = 0.31%). PE-PA performed similarly on new patients (R2 = 0.76, bias = -0.069%, 95% CI = -0.790% to 0.653%, RMSE = 0.37%). In external validation GMI, GV-PS, and PE-PA produced 73.8%, 87.5%, and 91.0% predictions within 0.5% (5.5 mmol/mol) from the true value. Conclusion: Constructed models performed better than GMI. PE-PA provided an accurate estimate of HbA1c with fast and straightforward implementation.
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Affiliation(s)
- Jędrzej Chrzanowski
- Department of Biostatistics and Translational Medicine, Diabetology, Endocrinology and Nephrology, Medical University of Lodz, Lodz, Poland
| | - Arkadiusz Michalak
- Department of Biostatistics and Translational Medicine, Diabetology, Endocrinology and Nephrology, Medical University of Lodz, Lodz, Poland
- Department of Department of Pediatrics, Diabetology, Endocrinology and Nephrology, Medical University of Lodz, Lodz, Poland
| | - Aleksandra Łosiewicz
- Department of Department of Pediatrics, Diabetology, Endocrinology and Nephrology, Medical University of Lodz, Lodz, Poland
| | - Hanna Kuśmierczyk
- Department of Department of Pediatrics, Diabetology, Endocrinology and Nephrology, Medical University of Lodz, Lodz, Poland
| | - Beata Mianowska
- Department of Department of Pediatrics, Diabetology, Endocrinology and Nephrology, Medical University of Lodz, Lodz, Poland
| | - Agnieszka Szadkowska
- Department of Department of Pediatrics, Diabetology, Endocrinology and Nephrology, Medical University of Lodz, Lodz, Poland
| | - Wojciech Fendler
- Department of Biostatistics and Translational Medicine, Diabetology, Endocrinology and Nephrology, Medical University of Lodz, Lodz, Poland
- Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
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Kameyama M, Okumiya T, Tokuhiro S, Matsumura Y, Matsui H, Ono Y, Iwasaka T, Hiratani K, Koga M. Estimation of the hemoglobin glycation rate constant. Sci Rep 2021; 11:986. [PMID: 33441732 PMCID: PMC7806940 DOI: 10.1038/s41598-020-80024-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Accepted: 12/03/2020] [Indexed: 11/08/2022] Open
Abstract
In a previous study, a method of obtaining mean erythrocyte age ([Formula: see text]) from HbA1c and average plasma glucose (AG) was proposed. However, the true value of the hemoglobin glycation constant ([Formula: see text] dL/mg/day), required for this model has yet to be well characterized. Another study also proposed a method of deriving [Formula: see text] from erythrocyte creatine (EC). Utilizing these formulae, this study aimed to determine a more accurate estimate of [Formula: see text]. One hundred and seven subjects including 31 patients with hemolytic anemia and 76 subjects without anemia were included in this study. EC and HbA1c data were analyzed, and [Formula: see text] using HbA1c, AG and the newly-derived constant, [Formula: see text] were compared to [Formula: see text] using traditional [Formula: see text] in three patients whose data were taken from previous case studies. A value of [Formula: see text] dL/mg/day was determined for [Formula: see text]. [Formula: see text] using HbA1c, AG and [Formula: see text] were found to no be significantly different (paired t-test, [Formula: see text]) to [Formula: see text] using traditional [Formula: see text]. [Formula: see text] enables the estimation of [Formula: see text] from HbA1c and AG.
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Affiliation(s)
- Masashi Kameyama
- Department of Diagnostic Radiology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Tokyo, 173-0015, Japan.
| | - Toshika Okumiya
- Department of Biomedical Laboratory Sciences, Faculty of Life Sciences, Kumamoto University, Kumamoto, 862-0976, Japan
| | - Shinji Tokuhiro
- Department Clinical Laboratory, Kochi Medical School Hospital, Kochi, 783-8505, Japan
| | - Yoshihisa Matsumura
- Department of Laboratory Medicine, Kochi Medical School, Kochi, 783-8505, Japan
| | - Hirotaka Matsui
- Department of Molecular Laboratory Medicine, Faculty of Life Sciences, Kumamoto University, Kumamoto, 860-8556, Japan
| | - Yasuhiro Ono
- Department of Internal Medicine, Kouhoukai Takagi Hospital, Fukuoka, 831-0016, Japan
| | - Tsuyoshi Iwasaka
- Preventive Medical Center, Kouhoukai Takagi Hospital, Fukuoka, 831-0016, Japan
| | - Kazuyuki Hiratani
- Diabetes Center, Shinseikai Toyama Hospital, Toyama, 939-0243, Japan
| | - Masafumi Koga
- Department of Internal Medicine, Hakuhokai Central Hospital, Hyogo, 661-0953, Japan
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Kameyama M, Koga M, Okumiya T. A novel method for calculating mean erythrocyte age using erythrocyte creatine. Aging (Albany NY) 2020; 12:8702-8709. [PMID: 32392179 PMCID: PMC7244067 DOI: 10.18632/aging.103193] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Accepted: 04/20/2020] [Indexed: 11/25/2022]
Abstract
Estimating the lifespan of erythrocytes is useful for the differential diagnosis of anemia. However, measuring the lifespan of erythrocytes was very difficult; therefore, it was seldom measured. Erythrocyte creatine (EC) decreases reflecting erythrocyte age. We developed a method to obtain mean erythrocyte age (MRBC) from EC.We reanalyzed the previously published data from 21 patients with hemolytic anemia, which included EC and the half-life of 51Cr.MRBC and loge EC showed excellent significant linearity (r = -0.9475, p < 0.001), proving that it could be treated as a mono-exponential relationship within the studied range (EC: 1.45 - 11.76 μmol/g Hb). We established an equation to obtain MRBC (days) from EC (μmol/g Hb): MRBC = -22.84loge EC + 65.83.This equation allowed calculation of MRBC based on EC which has practical applications such as the diagnosis of anemia.
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Affiliation(s)
- Masashi Kameyama
- Department of Diagnostic Radiology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Tokyo, Japan
| | - Masafumi Koga
- Department of Internal Medicine, Hakuhokai Central Hospital, Hyogo, Japan
| | - Toshika Okumiya
- Department of Biomedical Laboratory Sciences, Faculty of Health Sciences, Kumamoto University, Kumamoto, Japan
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Kameyama M, Koga M. Erythrocyte lifespan as a proposed explanation for increased risk of malignancies among people with low HbA1c. Acta Diabetol 2020; 57:499-500. [PMID: 31673893 DOI: 10.1007/s00592-019-01431-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 09/23/2019] [Indexed: 11/27/2022]
Affiliation(s)
- Masashi Kameyama
- Department of Diagnostic Radiology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173-0015, Japan.
| | - Masafumi Koga
- Department of Internal Medicine, Hakuhokai Central Hospital, Amagasaki, Japan
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Kameyama M, Watanabe K. A new non-invasive graphical method for quantification of cerebral blood flow with[[Formula: see text]] IMP. Ann Nucl Med 2018; 32:620-626. [PMID: 30046997 PMCID: PMC6208854 DOI: 10.1007/s12149-018-1282-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 07/17/2018] [Indexed: 11/16/2022]
Abstract
Objective [\documentclass[12pt]{minimal}
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\begin{document}$$^{123}\hbox {I}$$\end{document}123I] N-isopropyl-p-iodoamphetamine (\documentclass[12pt]{minimal}
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\begin{document}$$^{123}\hbox {I}$$\end{document}123I-IMP) is an ideal perfusion tracer for single photon emission computed tomography, which shows good linearity between cerebral blood flow (CBF) and accumulation. However, quantification of CBF using \documentclass[12pt]{minimal}
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\begin{document}$$^{123}\hbox {I}$$\end{document}123I-IMP without arterial blood sampling has been challenging, with previous methods requiring empirically obtained regression formulae to estimate CBF. Furthermore, the CBF value obtained via some of the previous methods would be affected by the clearance rate of \documentclass[12pt]{minimal}
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\begin{document}$$^{123}\hbox {I}$$\end{document}123I-IMP from the lungs. This paper introduces a new non-invasive quantification method for CBF using \documentclass[12pt]{minimal}
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\begin{document}$$^{123}\hbox {I}$$\end{document}123I-IMP and dynamic planar images. Methods We have developed a theory based on Microsphere model. This method does not involve regression formulae for estimation and allows for direct measurement of CBF, considering the clearance rate of \documentclass[12pt]{minimal}
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\begin{document}$$^{123}\hbox {I}$$\end{document}123I-IMP from the lungs. The study method is executed as easily as conventional Graph-Plot method. We compared the CBF values obtained by our study method and the established autoradiograph (ARG) method. Results CBF values obtained using the new method demonstrated significant correlation with values determined using ARG method. Conclusions The novel method described presents a reliable and more simple way of determining CBF when compared to current methods.
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Affiliation(s)
- Masashi Kameyama
- Department of Diagnostic Radiology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173-0015, Japan. .,Division of Nuclear Medicine, Department of Radiology, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan.
| | - Kiyotaka Watanabe
- Department of Product Plannning, Nihon Medi-Physics Co. Ltd., 3-4-10 Shinsuna, Koto-ku, Tokyo, 136-0075, Japan
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