Papers - Miyagawa, Naoko

Long-chain n-3 polyunsaturated fatty acids intake and cardiovascular disease mortality risk in Japanese: A 24-year follow-up of NIPPON DATA80

Naoko Miyagawa, Katsuyuki Miura, Nagako Okuda, Takashi Kadowaki, Naoyuki Takashima, Shin-ya Nagasawa, Yasuyuki Nakamura, Yasuhiro Matsumura, Atsushi Hozawa, Akira Fujiyoshi, Takashi Hisamatsu, Katsushi Yoshita, Akira Sekikawa, Takayoshi Ohkubo, Robert D. Abbott, Tomonori Okamura, Akira Okayama, Hirotsugu Ueshima

ATHEROSCLEROSIS (ELSEVIER IRELAND LTD)  232 ( 2 ) 384 - 9 2014.02

Research paper (scientific journal), Joint Work, Lead author, Accepted,  ISSN  0021-9150

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Background: Dietary intake of long-chain n-3 PUFA (LCn3FA) among Japanese is generally higher than that in Western populations. However, little is known whether an inverse association of LCn3FA with cardiovascular disease (CVD) risk exists in a population with higher LCn3FA intake.
Objective: To investigate the association between LCn3FA intake and the long-term risk of CVDs in a Japanese general population.
Methods: We followed-up a total of 9190 individuals (56.2% women, mean age 50.0 years) randomly selected from 300 areas across Japan and free from CVDs at baseline. Dietary LCn3FA intake was estimated using household weighed food records. Cox models were used to calculate multivariate-adjusted hazard ratios (HR) and confidence intervals (CI) according to sex specific quartiles of LCn3FA intake.
Results: During 24-year follow-up (192,897 person-years), 879 cardiovascular deaths were observed. The median daily intake of LCn3FA was 0.37% kcal (0.86 g/day). Adjusted HR for CVD mortality was lower in the highest quartile of LCn3FA intake (HR 0.80; 95% CI 0.66-0.96) compared with the lowest quartile, and the trend was statistically significant (P = 0.038). The similar but statistically non-significant trends were observed for coronary heart disease death and stroke death. In analyses by age groups, the inverse associations of LCn3FA intake with the risk of total CVD death and stroke death were significant in younger individuals (30-59 years at baseline).
Conclusion: LCn3FA intake was inversely and independently associated the long-term risk of total CVD mortality in a representative sample of Japanese with high LCn3FA intake. (C) 2013 Elsevier Ireland Ltd. All rights reserved.

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Impact of Metabolic Syndrome on the Risk of Cardiovascular Disease Mortality in the United States and in Japan

Longjian Liu, Katsuyuki Miura, Akira Fujiyoshi, Aya Kadota, Naoko Miyagawa, Yasuyuki Nakamura, Takayoshi Ohkubo, Akira Okayama, Tomonori Okamura, Hirotsugu Ueshima

AMERICAN JOURNAL OF CARDIOLOGY (EXCERPTA MEDICA INC-ELSEVIER SCIENCE INC)  113 ( 1 ) 84 - 9 2014.01

Research paper (scientific journal), Accepted,  ISSN  0002-9149

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The United States has a higher prevalence of metabolic syndrome (MS) and cardiovascular disease (CVD) mortality than Japan, but it is unknown how much of the difference in MS accounts for the mortality difference. The aim of this study was to examine the impact of MS on the excess CVD mortality in the United States compared with that in Japan. Data from the United States Third National Health and Nutrition Examination Survey (NHANES 111; n = 12,561) and the Japanese National Integrated Project for Prospective Observation of Noncommunicable Disease and Its Trends in Aged (NIPPON DATA; n = 7,453) were analyzed. MS was defined as of 5 risk factors (obesity, high blood pressure, decreased high-density lipoprotein cholesterol, elevated glycosylated hemoglobin, and elevated triglycerides). The results show that after a median of 13.8 years of follow-up in the United States, 1,683 patients died from CVD (11.75 per 1,000 person-years), and after a median of 15 years of follow-up in Japan, 369 patients died from CVD (3.56 per 1,000 person-years). The age-adjusted prevalence of MS was 26.7% in the United States and 19.3% in Japan. Of 5 MS factors, obesity, high blood pressure, elevated triglycerides, and glycosylated hemoglobin in the United States, and high blood pressure and elevated glycosylated hemoglobin in Japan were significant risk factors for CVD mortality. Estimates of 13.3% and 44% of the excess CVD mortality for the United States could be explained by the higher prevalence of MS and MS plus baseline CVD history than in Japan. In conclusion, the present study is the first to quantitatively demonstrate that MS and MS plus baseline CVD history may significantly contribute to the explanation of excess CVD mortality in the United States compared with Japan. (C) 2014 Elsevier Inc. All rights reserved.

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Interaction between dietary marine-derived n-3 fatty acids intake and J-point elevation on the risk of cardiac death: a 24-year follow-up of Japanese men

Takashi Hisamatsu, Katsuyuki Miura, Takayoshi Ohkubo, Takashi Yamamoto, Akira Fujiyoshi, Naoko Miyagawa, Aya Kadota, Naoyuki Takashima, Nagako Okuda, Yasuhiro Matsumura, Katsushi Yoshita, Yoshikuni Kita, Yoshitaka Murakami, Yasuyuki Nakamura, Tomonori Okamura, Minoru Horie, Akira Okayama, Hirotsugu Ueshima

HEART (BMJ PUBLISHING GROUP)  99 ( 14 ) 1024 - 9 2013.07

Research paper (scientific journal),  ISSN  1355-6037

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Objective Higher marine-derived n-3 fatty acids (MDn3FAs) intake reduces the risk of sudden cardiac death via antiarrhythmic effects. The article evaluates whether MDn3FAs intake attenuates the increased risk of cardiac death associated with J-point elevation (JPE), characterised by an elevation of QRS-ST junction (J-point) >= 0.1 mV on electrocardiography.
Design A prospective population-based cohort study.
Setting The National Survey on Circulatory Disorders and the National Nutrition Survey of Japan.
Participants A total of 4348 community-dwelling men (mean age 49.3 years), without cardiovascular diseases at baseline, from randomly selected areas across Japan.
Main outcome measures Cardiac death (200 men) during the 24-year follow-up.
Results Dietary MDn3FAs intake was assessed using a dietary method to estimate individual intake of household-based weighed food records for 3 days. Cox models were used to calculate HRs and 95% CIs adjusted for possible confounding factors. JPE was present in 340 participants (7.8%). The median daily intake of MDn3FAs was 0.35% kcal (0.92 g/day). The risk of cardiac death was significantly higher in participants with JPE than in those without JPE in the low intake group (<0.35% kcal; adjusted HR 3.51; 95% CI 1.84 to 6.73; p<0.001), but not in the high intake group (>= 0.35% kcal; adjusted HR 1.09; 95% CI 0.56 to 2.16; p=0.795). The interaction between dietary MDn3FAs intake and JPE on the risk of cardiac death was statistically significant (p=0.006).
Conclusions The increased risk of cardiac death associated with JPE may be attenuated by higher dietary MDn3FAs intake.

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Association between J-point elevation and death from coronary artery disease: 15-year follow-up of the NIPPON DATA90

Takashi Hisamatsu, Takayoshi Ohkubo, Katsuyuki Miura, Takashi Yamamoto, Akira Fujiyoshi, Naoko Miyagawa, Aya Kadota, Naoyuki Takashima, Shin-ya Nagasawa, Yoshikuni Kita, Yoshitaka Murakami, Akira Okayama, Minoru Horie, Tomonori Okamura, Hirotsugu Ueshima

Circulation Journal 77 ( 5 ) 1260 - 6 2013

Research paper (scientific journal), Accepted,  ISSN  1346-9843

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Background: An early repolarization pattern, characterized by an elevation of the QRS-ST junction (J-point) on 12-lead electrocardiography (ECG) is associated with cardiac and sudden death. However, little is known about the prognostic significance of J-point elevation for various disease-specific cardiovascular outcomes, including coronary artery disease (CAD). Methods and Results: To investigate the association between the presence of J-point elevation ≥0.1 mV and various disease-specific cardiovascular outcomes, we conducted a 15-year prospective study in a representative general Japanese population of 7,630 individuals (41% men, mean age 52.4 years) who participated in the National Survey of Circulatory Disorders. Cox models were used to estimate the hazard ratios (HRs) adjusted for possible confounding factors. J-point elevation was present in 264 individuals (3.5%) and was associated with an increased risk of cardiac death (adjusted HR, 2.54
95% confidence interval [CI] 1.40-4.58
P=0.002) and death from CAD (adjusted HR, 4.66
95% CI 2.30-9.46
P&lt
0.001). In a subgroup analysis by age, the association between J-point elevation and cardiovascular outcomes was more remarkable in middle-aged (&lt
60 years) than in older individuals (≥60 years) (all P for interaction &lt
0.05). Conclusions: J-point elevation on standard 12-lead ECG was an independent predictor of cardiac death and death from CAD in a representative sample of the general Japanese population, particularly among the middle-aged.

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Fatty acid intakes and coronary heart disease mortality in Japan: NIPPON DATA90, 1990-2005

Yasuyuki Nakamura, Yutaka Kiyohara, Nagako Okuda, Tomonori Okamura, Aya Higashiyama, Makoto Watanabe, Aya Kadota, Shin-ya Nagasawa, Naoko Miyagawa, Takayoshi Ohkubo, Yoshikuni Kita, Katsuyuki Miura, Akira Okayama, Hirotsugu Ueshima

Current Nutrition and Food Science 9 ( 1 ) 26 - 32 2013

ISSN  1573-4013

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Associations between dietary fatty acid intakes and risk of coronary heart disease (CHD) are not entirely consistent in prospective studies in the U.S. and Europe. Such studies in Japan are rare. The objective of this study was to examine the association between dietary total, saturated (SFA), and polyunsaturated (PUFA) fatty acids, cholesterol intake and CHD mortality using the dataset of NIPPON DATA90. At the baseline in 1990, we performed blood biochemical measurements and a nutritional survey on participants from 300 randomly selected districts. After exclusion of participants with a history of CHD and/or stroke at the baseline, we followed 7,819 community residents (3,254 men and 4,565 women, age ≥ 30) for 15 years. We estimated individual nutrient intakes among family members by weighed food records in three consecutive representative days. During the follow-up, there were 42 CHD deaths in men and 30 in women. Mean daily SFA and PUFA % calorie intakes were 5.90±1.36%, and 5.59±1.30%, respectively in men, and 6.48±1.53%, and 6.08±1.14% in women. A Cox analysis adjusted for age, vegetable and fruit intakes, and other confounders in women found that SFA intake was significantly associated with CHD mortality (hazards ratio per one quintile increment=1.34, 95% confidence intervals: 1.02-1.74, P=0.03), while no such association was noted in men. No associations were found between other fat intakes and CHD mortality in men or women. In conclusion, SFA intake was positively associated with CHD mortality independent of confounders in women, but not in men. © 2013 Bentham Science Publishers.

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Long-termrisk of BP values above normal for cardiovascular mortality: a 24-year observation of Japanese aged 30 to 92 years

Naoyuki Takashima, Takayoshi Ohkubo, Katsuyuki Miura, Tomonori Okamura, Yoshitaka Murakami, Akira Fujiyoshi, Shin-ya Nagasawa, Aya Kadota, Yoshikuni Kita, Naoko Miyagawa, Takashi Hisamatsu, Takehito Hayakawa, Akira Okayama, Hirotsugu Ueshima

JOURNAL OF HYPERTENSION (LIPPINCOTT WILLIAMS & WILKINS)  30 ( 12 ) 2299 - 306 2012.12

Research paper (scientific journal), Accepted,  ISSN  0263-6352

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Objective: In Western populations, blood pressure (BP) measured at baseline has been reported to predict long-term (over 20 years) risk of mortality from cardiovascular diseases (CVDs). However, corresponding evidence is scarce in Asia where stroke is dominant. We investigated the association between baseline BP and 24-year mortality risk due to CVD, in a representative Japanese general population.
Methods: We followed up a nationwide sample of 8592 Japanese, aged 30 years or above without a history of CVD and antihypertensive medication at baseline, for 24 years. Hazard ratios for CVD mortality in BP categories defined according to JCN7 criteria were estimated using Cox model adjusted for potential confounding factors with normal BP treated as the reference category.
Results: We observed 689 CVD deaths. Hazard ratios for CVD mortality were progressively and significantly increased from the category of prehypertension. Population-attributable fraction (PAF) demonstrated that 43 and 48% of CVD and stroke deaths were explained by non-normal BP at baseline. Hazard ratios and PAF were remarkably higher in younger participants (aged 30-59 years) than those in the elderly (aged 60 years or above). Particularly, in younger men, 81% of CVD deaths were explained by non-normal BP. In sensitivity analysis, participants with antihypertensive medication showed the highest hazard ratio for CVD morality compared with the other categories.
Conclusions: BP levels above normal at baseline retained significant relative and absolute risks of CVD and stroke mortality during 24 years. Long-lasting burden of non-normal BP particularly in younger individuals suggests the importance of primary prevention of high BP from younger generation.

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