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Qi Z, Tang S, Wu B, Li Y, Yang H, Wang K, Li Z. Evaluation of three prediction formulas of 24-hour urinary sodium excretion in Chinese residents: a systematic review and meta-analysis. Public Health Nutr 2024; 27:e71. [PMID: 38305112 DOI: 10.1017/s1368980024000168] [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] [Indexed: 02/03/2024]
Abstract
OBJECTIVE To determine the appropriateness of three widely used formulas estimating 24-h urinary Na (24hUNa) from spot urine samples in the Chinese population. DESIGN Systematic review and meta-analysis. SETTING Literature review was conducted to identify studies for estimating 24hUNa using the Kawasaki, Tanaka and INTERSALT formulas simultaneously in PubMed, Embase and the Cochrane library databases. The mean difference (MD) and correlation coefficients (r) between measures and estimates from different formulas were assessed. PARTICIPANTS Information extraction and quality assessment were performed in thirteen studies involving 8369 subjects. RESULTS Two studies which affected the overall robustness were excluded in the 'leave-one-out' sensitivity analyses. Within the final meta-analysis included eleven studies and 7197 participants, 36·07 mmol/d (95 %CI 16·89, 55·25) of MD was observed in the Kawasaki formula, and -19·62 mmol/d (95 %CI -37·37, -1·87) in the Tanaka formula and -35·78 mmol/d (95 %CI -50·76, -20·80) in the INTERSALT formula; a pooled r-Fisher's Z of 0·39 (95 %CI 0·32, 0·45) in the Kawasaki formula, 0·43 (95 %CI 0·37, 0·49) in the Tanaka formula and 0·36 (95 %CI 0·31, 0·42) in the INTERSALT formula. Subgroup analyses were conducted to explore the possible factors affecting the accuracy of the formula estimation from three mainly aspects: population types, Na intake levels and urine specimen types. CONCLUSIONS The meta-analysis suggested that the Tanaka formula performed a more accurate estimate in Chinese population. Time of collecting spot urine specimens and Na intake level of the sample population might be the main factors affecting the accuracy of the formula estimation.
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Affiliation(s)
- Zijing Qi
- School of Public Health, Shanxi Medical University, Taiyuan031000, China
| | - Shuai Tang
- School of Public Health, Shanxi Medical University, Taiyuan031000, China
| | - Beike Wu
- School of Public Health, Harbin Medical University, Harbin150081, China
| | - Yanxing Li
- School of Public Health, Shanxi Medical University, Taiyuan031000, China
| | - Hongmei Yang
- Department of Public Health and Preventive Medicine, Changzhi Medical College, Changzhi046000, China
| | - Kunbo Wang
- CLASS 2202, Xiangya School of Medicine, Central South University, Changsha410000, China
| | - Zhifang Li
- School of Public Health, Shanxi Medical University, Taiyuan031000, China
- Department of Public Health and Preventive Medicine, Changzhi Medical College, Changzhi046000, China
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Groenland EH, Vendeville JPAC, Bots ML, Visseren FLJ, Musson REA, Spiering W. Validation of spot urine in estimating 24-h urinary sodium, potassium and sodium-to-potassium ratio during three different sodium diets in healthy adults. Blood Press 2023; 32:2170868. [PMID: 36752063 DOI: 10.1080/08037051.2023.2170868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
PURPOSE To evaluate the validity of spot urine assay methods in estimating the 24-h urinary sodium, potassium and sodium-to-potassium ratio during three different sodium diets. MATERIALS AND METHODS Twelve healthy volunteers were asked to adhere to 3 dietary sodium targets (3.3-5.0g/day,<3.3 g/day and >5.0 g/day) for three consecutive weeks and to measure salt excretion daily in spot urine samples using a self-monitoring device. On day 7 of each week, 24-h urine was collected to compare measured with estimated 24-h salt excretion (by the Kawasaki, Tanaka and INTERSALT equations). RESULTS Correlation coefficients relating measured and estimated 24-h sodium excretion were low and not significant for Kawasaki and INTERSALT and moderate for the Tanaka equation (τ 0.56-0.64,p<.05). Bland-Altman plots showed considerable differences between estimated and measured sodium excretion across all salt diets. Over 40% of the participants showed an absolute difference between measured and estimated 24-h sodium of more than 1000 mg/day. The correlation coefficients between 24-h and spot Na/K ratio were 0.67, 0.94 and 0.85(p<.05), and mean differences were 0.59, 0.06 and 0.48 for the intermediate, low and high sodium diets, respectively. CONCLUSION These findings do not support estimation of individual 24-h salt excretion from spot urine by the Kawasaki, Tanaka, or INTERSALT formula. Plain language summaryAccurate monitoring of salt intake is essential to improve BP control. At present, measurement of sodium and potassium excretion in multiple non-consecutive 24-h urinary collections is considered the gold standard for measuring dietary sodium intake. However, this method is burdensome, time-consuming and error prone.Therefore, we assessed and compared the validity of three formula-based approaches to estimate 24-h urinary sodium and potassium excretion and the Na/K ratio from spot urine samples measured by a self-monitoring device under three different sodium diets using 24-h urine collections as the reference.We conclude that use of three commonly used equations that estimate 24-h urinary sodium and potassium excretion result in substantial bias, poor precision and poor accuracy and are therefore not recommended. The Na/K ratio based on multiple casual urine samples may be a useful, low-burden, low-cost alternative method to 24-h urine collection for monitoring daily salt intake.
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Affiliation(s)
- Eline H Groenland
- Department of Vascular Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Jean-Paul A C Vendeville
- Department of Vascular Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Michiel L Bots
- Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Frank L J Visseren
- Department of Vascular Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Ruben E A Musson
- Department of Clinical Chemistry and Haematology, University Medical Centre Utrecht, Utrecht, the Netherlands
| | - Wilko Spiering
- Department of Vascular Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
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Hariri M, Ramezani AM, Shamshirgaran SM, Gholami A. Is a spot urine sample a good substitution to estimate 24-h urinary sodium excretion in a population ≥ 50 years old? A validation study. Eur J Nutr 2023; 62:3277-3286. [PMID: 37580619 DOI: 10.1007/s00394-023-03217-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Accepted: 07/18/2023] [Indexed: 08/16/2023]
Abstract
PURPOSE A variety of prediction equations have been able to estimate 24-h urinary sodium excretion from spot urine samples; however, Iranians over the age of 50 have not been compared and verified. Using spot urine samples as a substitute for 24-h urine samples to estimate 24-h urine sodium excretion among the population age 50 and older are the purpose of this study. METHODS A 24-h urinary sodium excretion was studied by well-known Kawasaki, INTERSALT, Tanaka, and World Health Organization/Pan American Health Organization (WHO/PAHO) formulas. On 360 individuals, the mean bias, agreements between estimated and measured values, correlation, absolute and relative differences, and misclassification rates were evaluated for four equations. RESULTS As a result, the mean urinary sodium excretion for a 24-h period was 136.3 ± 52.21 mmol/24-h, which corresponds to a calculated intake of 9.1 ± 3.8 g of salt per day. According to the WHO/PAHO formula, the mean bias between measured values and estimated 24-h urinary sodium excretion is - 21.6 mg/day (95% confidence interval (CI) - 144.8, 101.6 mg/day), which is the smallest difference compared with the other three formulas. The lowest rate of individual misclassification of salt intake was 40% for WHO/PAHO, especially for those who consumed less than 9 g/day, while Kawasaki had the lowest misclassification rate at higher levels of salt intake. CONCLUSION As a result of our research, the WHO/PAHO equations accurately predict 24-h urinary sodium excretion among Iranians aged ≥ 50 more than other equations, both at the population level and at the individual level. However, further study is needed in regard to different ages in Iran.
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Affiliation(s)
- Mitra Hariri
- Noncommunicable Diseases Research Center, Neyshabur University of Medical Sciences, Neyshabur, Iran
| | - Amir M Ramezani
- Healthy Ageing Research Centre, Neyshabur University of Medical Sciences, Neyshabur, Iran
| | - Seyed Morteza Shamshirgaran
- Healthy Ageing Research Centre, Neyshabur University of Medical Sciences, Neyshabur, Iran
- Department of Epidemiology and Biostatistics, School of Public Health, Neyshabur University of Medical Sciences, Neyshabur, Iran
| | - Ali Gholami
- Noncommunicable Diseases Research Center, Neyshabur University of Medical Sciences, Neyshabur, Iran.
- Department of Epidemiology and Biostatistics, School of Public Health, Neyshabur University of Medical Sciences, Neyshabur, Iran.
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Etiological Diagnosis and Personalized Therapy for Hypertension: A Hypothesis of the REASOH Classification. J Pers Med 2023; 13:jpm13020261. [PMID: 36836495 PMCID: PMC9960440 DOI: 10.3390/jpm13020261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/08/2023] [Accepted: 01/28/2023] [Indexed: 01/31/2023] Open
Abstract
With the epidemic of risk factors such as unhealthy lifestyle, obesity and mental stress, the prevalence of hypertension continues to rise across the world. Although standardized treatment protocols simplify the selection of antihypertensive drugs and ensure therapeutic efficacy, the pathophysiological state of some patients remains, which may also lead to the development of other cardiovascular diseases. Thus, there is an urgent need to consider the pathogenesis and selection of antihypertensive drug for different type of hypertensive patients in the era of precision medicine. We proposed the REASOH classification, based on the etiology of hypertension, including renin-dependent hypertension, elderly-arteriosclerosis-based hypertension, sympathetic-active hypertension, secondary hypertension, salt-sensitive hypertension and hyperhomocysteinemia hypertension. The aim of this paper is to propose a hypothesis and provide a brief reference for the personalized treatment of hypertensive patients.
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Wu B, Yang H, Ren X, Qi Z, Tang S, Yin X, Huang L, Tian M, Wu Y, Feng X, Li Z. A Method for Estimating 24 h Urinary Sodium and Potassium Excretion by Spot Urine Specimen in Stroke Patients. Nutrients 2022; 14:nu14194105. [PMID: 36235755 PMCID: PMC9573759 DOI: 10.3390/nu14194105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/28/2022] [Accepted: 09/28/2022] [Indexed: 11/10/2022] Open
Abstract
Spot urine specimens have been used to estimate 24 h urinary sodium (Na) excretion (24UNaV) and potassium (K) excretion (24UKV). However, the validity is limited for 24UNaV and unknown for 24UKV in stroke patients, using the existing formulas. Herein, we developed and validated a new formula for 24UNaV and 24UKV by spot urine specimens in stroke patients. Spot and 24 h urine samples were collected from 970 stroke patients. The models of 24UNaV and 24UKV were developed using stepwise multivariate linear regression in 689 patients. The performance of different formulas was internally validated in 281 patients at the population and individual levels. The obtained new formulas were: (1) estimated 24UNaV (mmol/day): -0.191 × Age + 4.349 × BMI + 0.229 × SpotNa + 1.744 × SpotNa/Spot creatinine (Cr) + 41.492 (for male); -1.030 × Age + 2.011 × BMI + 0.143 × SpotNa + 1.035 × SpotNa/SpotCr + 147.159 (for female); and (2) estimated 24UKV (mmol/day): -0.052 × Age + 0.410 × BMI + 0.031 × SpotK + 33.280 × Ln (spotK/spot Cr) - 5.789 × Ln (spotNa/spot Cr) - 1.035 (for male); -0.235 × Age + 0.530 × BMI + 0.040 × SpotK + 30.990 × Ln (spot K/spot Cr) - 7.837 × Ln (spotNa/spotCr) + 4.318 (for female). The new formula obtained the lowest mean bias (5.17 mmol/day for 24UNaV and 0.85 mmol/day for 24UKV) and highest proportion at the cutoff under the ±30% level for the estimation of 24UNaV (59.43%) and 24UKV (70.11%). The new formula provides a meaningful exploration to estimate 24UNaV and 24UKV in stroke patients by using spot urine specimens.
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Affiliation(s)
- Beike Wu
- School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Hongmei Yang
- School of Public Health, Changzhi Medical College, Changzhi 046000, China
| | - Xinyu Ren
- School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Zijing Qi
- School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Shuai Tang
- School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Xuejun Yin
- The George Institute for Global Health, University of New South Wales, Newtown, NSW 2042, Australia
| | - Liping Huang
- The George Institute for Global Health, University of New South Wales, Newtown, NSW 2042, Australia
| | - Maoyi Tian
- The George Institute for Global Health, University of New South Wales, Newtown, NSW 2042, Australia
- School of Public Health, Harbin Medical University, Harbin 150081, China
| | - Yangfeng Wu
- Clinical Research Center, Peking University, Beijing 100088, China
| | - Xiangxian Feng
- School of Public Health, Changzhi Medical College, Changzhi 046000, China
| | - Zhifang Li
- School of Public Health, Shanxi Medical University, Taiyuan 030001, China
- School of Public Health, Changzhi Medical College, Changzhi 046000, China
- Correspondence: ; Tel.: +86-18636517556
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Choudhury SR, Al-Mamun MA, Akhtar J, Nabi Sayem MN, Zahed Z, Rahman MA, Ahmed J, Zaman MM. Comparison of three spot urine formulae and their validation using 24-hour urine sodium for estimation of daily salt intake: a cross-sectional study among Bangladeshi adults. BMJ Open 2022; 12:e061348. [PMID: 36581969 PMCID: PMC9438190 DOI: 10.1136/bmjopen-2022-061348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
OBJECTIVE This study aimed to assess the validity of three commonly used (Tanaka, Kawasaki, INTERSALT) methods based on spot urinary sodium excretion against the 24-hour urinary sodium excretion to estimate the dietary salt intake in Bangladesh. DESIGN A population-based cross-sectional survey. SETTING A cross-sectional survey was done in an urban and a rural area of Bangladesh in 2012-2013. PARTICIPANTS 418 community living residents aged 40-59 years participated in the survey and data of 227 subjects who had complete information were analysed for this validation study. OUTCOME MEASURES The Bland-Altman method was used to evaluate the agreement between the estimated and measured 24-hour urinary sodium. The estimated average salt intake from Tanaka, Kawasaki and INTERSALT methods were plotted against 24-hour urinary sodium excretion. RESULTS The mean 24-hour estimated salt intake was 10.0 g/day (95% CI 9.3 to 10.6). The mean estimated urinary salt by Tanaka, Kawasaki and INTERSALT methods were 8.5 g/day (95% CI 8.2 to 8.8), 11.4 g/day (95% CI 10.8 to 12.0) and 8.8 g/day (95% CI 8.6 to 9.0), respectively. Compared with the estimated mean salt intake from 24-hour urine collection, the Bland-Altman plot indicated the mean salt intake was overestimated by the Kawasaki method and underestimated by Tanaka and INTERSALT methods. The linear regression line showed the Kawasaki method was the least biased and had the highest intraclass correlation coefficient (0.57, 95% CI 0.45 to 0.67). CONCLUSION Tanaka, Kawasaki and INTERSALT methods were not appropriate for the estimation of 24-hour urinary sodium excretion from spot urine samples to assess dietary salt intake in Bangladesh. Among the three methods, the Kawasaki method has the highest agreement with the 24-hour urinary sodium excretion concentration in this population.
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Affiliation(s)
- Sohel Reza Choudhury
- Department of Epidemiology & Research, National Heart Foundation Hospital and Research Institute, Dhaka, Bangladesh
| | - Mohammad Abdullah Al-Mamun
- Department of Epidemiology & Research, National Heart Foundation Hospital and Research Institute, Dhaka, Bangladesh
| | - Jubaida Akhtar
- Department of Epidemiology & Research, National Heart Foundation Hospital and Research Institute, Dhaka, Bangladesh
| | - Md Noor Nabi Sayem
- Department of Epidemiology & Research, National Heart Foundation Hospital and Research Institute, Dhaka, Bangladesh
| | - Zerin Zahed
- Department of Epidemiology & Research, National Heart Foundation Hospital and Research Institute, Dhaka, Bangladesh
| | - Mohammad Ataur Rahman
- Department of Epidemiology & Research, National Heart Foundation Hospital and Research Institute, Dhaka, Bangladesh
| | - Jasimuddin Ahmed
- Department of Pathology, National Heart Foundation Hospital & Research Institute, Dhaka, Bangladesh
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Tsai Y, Tsao Y, Huang C, Tai Y, Su Y, Chiang C, Sung S, Chen C, Cheng H. Effectiveness of salt substitute on cardiovascular outcomes: A systematic review and meta‐analysis. J Clin Hypertens (Greenwich) 2022; 24:1147-1160. [DOI: 10.1111/jch.14562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 07/14/2022] [Accepted: 07/30/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Yi‐Ching Tsai
- Department of Medical Education Taipei Veterans General Hospital Taipei Taiwan
| | - Yen‐Po Tsao
- Department of Internal Medicine Taipei Veterans General Hospital Taipei Taiwan
- School of Medicine National Yang Ming Chiao Tung University Taipei Taiwan
| | - Chi‐Jung Huang
- Center for Evidence‐Based Medicine Taipei Veterans General Hospital Taipei Taiwan
| | - Yen‐Hsuan Tai
- Department of Medical Education Taipei Veterans General Hospital Taipei Taiwan
| | - Yang‐Chin Su
- Department of Medical Education Taipei Veterans General Hospital Taipei Taiwan
| | - Chern‐En Chiang
- School of Medicine National Yang Ming Chiao Tung University Taipei Taiwan
- General Clinical Research Center Taipei Veterans General Hospital Taipei Taiwan
| | - Shih‐Hsien Sung
- School of Medicine National Yang Ming Chiao Tung University Taipei Taiwan
- Division of Cardiology Department of Internal Medicine Taipei Veterans General Hospital Taipei Taiwan
| | - Chen‐Huan Chen
- Department of Medical Education Taipei Veterans General Hospital Taipei Taiwan
- School of Medicine National Yang Ming Chiao Tung University Taipei Taiwan
- Institute of Public Health and Community Medicine Research Center National Yang Ming Chiao Tung University School of Medicine Taipei Taiwan
| | - Hao‐Min Cheng
- Department of Medical Education Taipei Veterans General Hospital Taipei Taiwan
- School of Medicine National Yang Ming Chiao Tung University Taipei Taiwan
- Center for Evidence‐Based Medicine Taipei Veterans General Hospital Taipei Taiwan
- Institute of Public Health and Community Medicine Research Center National Yang Ming Chiao Tung University School of Medicine Taipei Taiwan
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Accuracy of equations for predicting 24-h urinary potassium excretion from spot urine samples in Chinese children. Br J Nutr 2022; 128:444-452. [PMID: 34593059 DOI: 10.1017/s0007114521003354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Accurate assessments of potassium intake in children are important for the early prevention of CVD. Currently, there is no simple approach for accurate estimation of potassium intake in children. We aim to evaluate the accuracy of 24-h urinary potassium excretion (24UKV) estimation in children using three common equations: the Kawasaki, Tanaka and Mage formulas, in a hospital-based setting. A total of 151 participants aged 5-18 years were initially enrolled, and spot urine samples were collected in the whole 24-h duration to measure the concentrations of potassium and creatinine. We calculated the mean difference, absolute and relative difference and misclassification rate between measured 24UKV and the predicted ones using Kawasaki, Tanaka and Mage formulas in 129 participants. The mean measured 24UKV was 1193·3 mg/d in our study. Mean differences between estimated and measured 24UKV were 1215·6, -14·9 and 230·3 mg/d by the Kawasaki, Tanaka and Mage formulas, respectively. All estimated 24UKV were significantly different from the measured values in all the time point (all P < 0·05), except for the predicted values from Tanaka formula using morning, afternoon and evening spot urine. The proportions with relative differences over 40 % were 87·2%, 32·5% and 47·3 % for Kawasaki, Tanaka and Mage formulas, respectively. Misclassification rates were 91·5 % for Kawasaki, 44·4 % for Tanaka and 58·9 % for Mage formula at the individual level. Our findings showed that misclassification could occur on the individual level when using Kawasaki, Tanaka and Mage formulas to estimate 24UKV from spot urine in the child population.
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Gong W, Ma Y, Zhang Z, Liang J, Zhang J, Ding G. Validation of 4 Estimating Methods to Evaluate 24-h Urinary Sodium Excretion: Summer and Winter Seasons for College Students in China. Nutrients 2022; 14:nu14132736. [PMID: 35807918 PMCID: PMC9269089 DOI: 10.3390/nu14132736] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 06/22/2022] [Accepted: 06/24/2022] [Indexed: 02/04/2023] Open
Abstract
Twenty-four-hour urine sample collection is regarded as the gold standard for sodium intake evaluation, but the implementation can be difficult. The objective was to validate and evaluate the accuracy and feasibility of estimating sodium intake by four methods. A group of 268 healthy volunteers aged 18–25 years was enrolled in this study. Twenty-four-hour urine samples as well as timed (morning, afternoon, evening, and overnight) urine samples were randomly collected in summer and winter. The sodium intake was estimated by four published methods—Kawasaki, INTERSALT, Tanaka, and Sun’s. The consistencies between estimated sodium intake and real measured values of 24-h urinary sodium excretion were compared by Bland–Altman plots in each of the methods. The 24-h urinary sodium analysis result indicated that average daily sodium intake was 3048.4 ± 1225.9 mg in summer and 3564.7 ± 1369.9 mg in winter. At the population level, the bias (estimated value-measured value) was the least with the INTERSALT method with afternoon (−39.7 mg; 95%CI: −164.7, 85.3 mg) and evening (−43.5 mg; 95%CI: −166.4, 79.5 mg) samples in summer. In winter, the Kawasaki method (162.1 mg; 95%CI: 13.5, 310.7 mg) was superior to others. Estimation of sodium intake using the four methods is affected by the time and temperature. In summer, the INTERSALT method provides the best estimation of the population’s mean sodium intake. The Kawasaki method is superior to other methods in winter.
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Affiliation(s)
- Weiyi Gong
- Key Laboratory of Trace Elements Nutrition of National Health Commission, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China;
| | - Yuxia Ma
- Hebei Key Laboratory of Environment and Human Health, Department of Nutrition and Food Hygiene, School of Public Health, Hebei Medical University, Shijiazhuang 050017, China; (Y.M.); (Z.Z.); (J.L.)
| | - Zechen Zhang
- Hebei Key Laboratory of Environment and Human Health, Department of Nutrition and Food Hygiene, School of Public Health, Hebei Medical University, Shijiazhuang 050017, China; (Y.M.); (Z.Z.); (J.L.)
| | - Jufeng Liang
- Hebei Key Laboratory of Environment and Human Health, Department of Nutrition and Food Hygiene, School of Public Health, Hebei Medical University, Shijiazhuang 050017, China; (Y.M.); (Z.Z.); (J.L.)
| | - Jiguo Zhang
- Key Laboratory of Trace Elements Nutrition of National Health Commission, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China;
- Correspondence: (J.Z.); (G.D.); Tel.: +86-010-6623-7094 (J.Z.); +86-010-6623-7001 (G.D.)
| | - Gangqiang Ding
- Key Laboratory of Trace Elements Nutrition of National Health Commission, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China;
- Correspondence: (J.Z.); (G.D.); Tel.: +86-010-6623-7094 (J.Z.); +86-010-6623-7001 (G.D.)
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Re F, Hammami I, Littlejohns TJ, Arnold M, Lewington S, Clarke RJ, Carter JL. Effects of Within-Person Variability in Spot Urinary Sodium Measurements on Associations With Blood Pressure and Cardiovascular Disease. Hypertension 2021; 78:1628-1636. [PMID: 34538101 PMCID: PMC7611839 DOI: 10.1161/hypertensionaha.120.16549] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 08/11/2021] [Indexed: 12/18/2022]
Abstract
Randomized trials of salt restriction have consistently demonstrated that decreasing salt consumption lowers blood pressure, but results of observational studies of salt intake and cardiovascular disease have been conflicting. After excluding individuals with prevalent cardiovascular or kidney disease in the prospective UK Biobank study, we examined the within-person variability in spot urinary sodium excretion and its impact on associations with systolic blood pressure and risk of incident cardiovascular disease. Spearman correlation coefficients were used to assess within-person variability in spot urinary sodium, and associations between sodium and blood pressure were assessed using linear regression in participants with measurements at baseline (N=355 134) and after 9 years (N=33 915). Cox regression was used to assess associations with the risk of cardiovascular disease over the same follow-up period (N=5566 events). The within-person variability in urinary sodium was extreme, with a self-correlation coefficient of 0.35 over 4 years. Each 100 mmol/L higher usual urinary sodium was associated with 3.09 mm Hg higher systolic blood pressure (95% CI, 2.7–3.48) at baseline, but had no association at 9 years (0.97 [−0.44 to 2.37]). Likewise, there was no association between urinary sodium and risk of cardiovascular disease over the same follow-up period (hazard ratio, 1.05, [0.87–1.26]). While spot urinary sodium measurements were associated with immediate effects on blood pressure at baseline, the extreme within-person variability in urinary sodium precluded detection of associations with future blood pressure at resurvey or risk of cardiovascular disease. The limitations of observational studies, irrespective of study size, should be recognized when assessing public policy on salt restriction.
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Affiliation(s)
- Federica Re
- From the Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Medicine, University of Oxford, United Kingdom (F.R., I.H., T.J.L., S.L., R.J.C., J.L.C.)
| | - Imen Hammami
- From the Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Medicine, University of Oxford, United Kingdom (F.R., I.H., T.J.L., S.L., R.J.C., J.L.C.)
| | - Thomas J. Littlejohns
- From the Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Medicine, University of Oxford, United Kingdom (F.R., I.H., T.J.L., S.L., R.J.C., J.L.C.)
| | - Matthew Arnold
- British Heart Foundation Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom (M.A.)
| | - Sarah Lewington
- From the Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Medicine, University of Oxford, United Kingdom (F.R., I.H., T.J.L., S.L., R.J.C., J.L.C.)
- MRC Population Health Research Unit (S.L.)
| | - Robert J. Clarke
- From the Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Medicine, University of Oxford, United Kingdom (F.R., I.H., T.J.L., S.L., R.J.C., J.L.C.)
| | - Jennifer L. Carter
- From the Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Medicine, University of Oxford, United Kingdom (F.R., I.H., T.J.L., S.L., R.J.C., J.L.C.)
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Zhang X, Liao H, Ye R, Li X, Gou Q, Zhang Z, Shi R, Meng Q, Zhuoma Z, Zhang H, Chen X. Assessment and validation of three spot urine assay methods for the estimation of 24-hour urinary sodium excretion in Chinese Tibetan adults living in the mountains. J Clin Hypertens (Greenwich) 2021; 23:1588-1598. [PMID: 34196446 PMCID: PMC8678802 DOI: 10.1111/jch.14312] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 05/17/2021] [Accepted: 06/03/2021] [Indexed: 02/05/2023]
Abstract
Twenty‐four‐hour urine collection is the gold standard method for the evaluation of salt intake, but it is often impractical in large‐scale investigations, especially in resource‐poor areas. Methods for the estimation of 24‐hour urinary sodium excretion (USE) using a spot urine sample have been established, but have not been validated in Chinese Tibetans. Therefore, the authors aimed to evaluate the Kawasaki, Tanaka, and the International Cooperative Study on Salt, Other Factors, and Blood Pressure (INTERSALT) formulas for the prediction of 24‐hour USE in Chinese Tibetan adults. The authors analyzed the bias, correlation, agreements between estimated values and measured values, and the relative and absolute differences and misclassification at the individual level for the three methods in 323 Tibetan participants from the Ganzi Tibetan Autonomous Prefecture of Sichuan Province, China. The mean biases between the measured values and the estimated 24‐hour USE using the Kawasaki, Tanaka, and INTERSALT methods were 5.4 mmol/day (95% confidence interval [CI]: 0.8–10.1 mmol/day), −40.8 mmol/day (95% CI: −44.6 to −36.9 mmol/day), and −57.1 mmol/day (95% CI: −61.9 to −52.4 mmol/day), respectively. The Pearson correlation coefficients for the relationships between the measured values and the estimated 24‐hour USE were 0.43 (Kawasaki), 0.38 (Tanaka), and 0.27 (INTERSALT), respectively (all p < .01). The intraclass correlation coefficients showed similar patterns to the correlation data: 0.47 for Kawasaki, 0.40 for Tanaka, and 0.27 for INTERSALT (all p < .01). The upper and lower limits of agreement between the measured values and the estimated 24‐hour USE were −92.6 and 81.8 mmol/day for the Kawasaki method, −28.5 and 110.0 mmol/day for the Tanaka method, and −28.4 and 142.7 mmol/day for the INTERSALT method. Compared with the other two methods, the percentage of individuals that were misclassified by using the Kawasaki method was 48.2%, while those for the Tanaka and INTERSAL methods was 72.1% and 75.5%, respectively. However, when an individual's salt intake was higher than 12.8 g/day, the misclassification rates of the Kawasaki, Tanaka, and INTERSALT methods were 20%, 90%, and 97.5%, respectively. Thus, the authors found that the Kawasaki equation may have performed better than the other equations at Chinese Tibetan population level assessment, but none of these equations are suitable for use or perform well at the individual level. A more accurate method of using a spot urine sample to evaluate individual 24‐hour USE for Tibetans is needed.
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Affiliation(s)
- Xin Zhang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
| | - Hang Liao
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
| | - Runyu Ye
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
| | - Xinran Li
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
| | - Qiling Gou
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
| | - Zhipeng Zhang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
| | - Rufeng Shi
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
| | - Qingtao Meng
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
| | - Zewong Zhuoma
- Luohuo County Health Bureau, Ganzi Tibetan Autonomous Prefecture, Luhuo, Sichuan Province, People's Republic of China
| | - Hengyu Zhang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
| | - Xiaoping Chen
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People's Republic of China
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Ginos BN, Engberink RHO. Estimation of Sodium and Potassium Intake: Current Limitations and Future Perspectives. Nutrients 2020; 12:nu12113275. [PMID: 33114577 PMCID: PMC7692368 DOI: 10.3390/nu12113275] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 10/16/2020] [Accepted: 10/16/2020] [Indexed: 12/24/2022] Open
Abstract
Globally, average dietary sodium intake is double the recommended amount, whereas potassium is often consumed in suboptimal amounts. High sodium diets are associated with increased cardiovascular and renal disease risk, while potassium may have protective properties. Consequently, patients at risk of cardiovascular and renal disease are urged to follow these recommendations, but dietary adherence is often low due to high sodium and low potassium content in processed foods. Adequate monitoring of intake is essential to guide dietary advice in clinical practice and can be used to investigate the relationship between intake and health outcomes. Daily sodium and potassium intake is often estimated with 24-h sodium and potassium excretion, but long-term balance studies demonstrate that this method lacks accuracy on an individual level. Dietary assessment tools and spot urine collections also exhibit poor performance when estimating individual sodium and potassium intake. Collection of multiple consecutive 24-h urines increases accuracy, but also patient burden. In this narrative review, we discuss current approaches to estimating dietary sodium and potassium intake. Additionally, we explore alternative methods that may improve test accuracy without increasing burden.
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Affiliation(s)
- Bigina N.R. Ginos
- Department of Nephrology, Amsterdam University Medical Centres, Academic Medical Centre, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
- Correspondence:
| | - Rik H.G. Olde Engberink
- Amsterdam Cardiovascular Sciences, VU University Medical Center, 1081 HV Amsterdam, The Netherlands;
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Estimating 24-Hour Sodium Excretion from Spot Urine Samples in Chinese Adults: Can Spot Urine Substitute 24-Hour Urine Samples? Nutrients 2020; 12:nu12030798. [PMID: 32197398 PMCID: PMC7146571 DOI: 10.3390/nu12030798] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 03/13/2020] [Accepted: 03/17/2020] [Indexed: 11/19/2022] Open
Abstract
Several estimating equations for predicting 24-h urinary sodium (24-hUNa) excretion using spot urine (SU) samples have been developed, but have not been readily available to Chinese populations. We aimed to compare and validate the six existing methods at population level and individual level. We extracted 1671 adults eligible for both 24-h urine and SU sample collection. Mean biases (95% CI) of predicting 24-hUNa excretion using six formulas were 58.6 (54.7, 62.5) mmol for Kawasaki, −2.7 (−6.2, 0.9) mmol for Tanaka, −24.5 (−28.0, −21.0) mmol for the International Cooperative Study on Salt, Other Factors, and Blood Pressure (INTERSALT) with potassium, –26.8 (−30.1, −23.3) mmol for INTERSALT without potassium, 5.9 (2.3, 9.6) mmol for Toft, and −24.2 (−27.7, −20.6) mmol for Whitton. The proportions of relative difference >40% with the six methods were nearly a third, and the proportions of absolute difference >51.3 mmol/24-h (3 g/day salt) were more than 40%. The misclassification rate were all >55% for the six methods at the individual level. Although the Tanaka method could offer a plausible estimation for surveillance of the population sodium excretion in Shandong province, caution remains when using the Tanaka formula for other provincial populations in China. However, these predictive methods were inadequate to evaluate individual sodium excretion.
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