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Heart Disease in Asia Shigetake Sasayama Circulation 2008;118;2669-2671 DOI: 10.1161/CIRCULATIONAHA.108.837054 Circulation is published by the American Heart Association. 7272 Greenville Avenue, Dallas, TX 72514 Copyright © 2008 American Heart Association. All rights reserved. Print ISSN: 0009-7322. Online ISSN: 1524-4539 The online version of this article, along with updated information and services, is located on the World Wide Web at: http://circ.ahajournals.org/cgi/content/full/118/25/2669 Subscriptions: Information about subscribing to Circulation is online at http://circ.ahajournals.org/subscriptions/ Permissions: Permissions & Rights Desk, Lippincott Williams & Wilkins, a division of Wolters Kluwer Health, 351 West Camden Street, Baltimore, MD 21202-2436. Phone: 410-528-4050. Fax: 410-528-8550. E-mail: [email protected] Reprints: Information about reprints can be found online at http://www.lww.com/reprints Downloaded from circ.ahajournals.org at TAIVET GEN HOSPITAL on December 23, 2008 Editorial Heart Disease in Asia Shigetake Sasayama People desirous of knowing the diversities of the races of mankind, as well as the diversities of regions of all parts of the East, read through this book and you will find in it the greatest and most marvelous characteristics of the people . . . From the Prologue to The Travels of Marco Polo W ith the advent of an aging society, heart disease has become one of the most important health problems worldwide. Heart disease is estimated to increase continuously during the next few decades. In fact, the number of people ⱖ60 years of age is expected to double by 2025 and to triple by 2050 globally.1 The proportion of this aged population is likely to increase more in the Asian-Pacific region; thus, half of the world’s cardiovascular burden is predicted to occur in this area.2 Risk Factors of Cardiovascular Diseases Increases in levels of risk factors, in particular total cholesterol and blood pressure, appear to account for a substantial amount of the age-related increase in coronary heart disease. This themed issue highlights the perspective for the contributions of risk factors to the excess coronary heart disease mortality in populations of the Asia-Pacific region. Cardiovascular risk factors are traditionally derived from studies in whites. However, relationships between these traditional risk factors and cardiovascular disease may differ in Asian and Western societies. The ethnic differences in the association between diabetes mellitus and ischemic heart disease are noted even within Asian populations.3 In Asian countries, as a consequence of the economic developments, the prevalence of overweight and obesity is increasing, and more important, rates of diabetes are increasing even more quickly. In particular, a moderate increase in body mass index makes South Asians more prone to insulin resistance and related diseases.4 Thus, it has been suggested that lower cutoff points for body mass index be adopted in Asian than in Western countries. In most Asian countries, mean levels of total cholesterol are lower than those found in Western countries, with a lower incidence of coronary heart disease. In the Asia-Pacific region, up to two thirds of cardiovascular diseases are indicated to be attributed to hypertension, underscoring the The opinions expressed in this article are not necessarily those of the editors or of the American Heart Association. From Doshisha University, Department of Life and Medical Science, Kyotanabe, Kyoto, Japan. Correspondence to Shigetake Sasayama, Doshisha University, Department of Life and Medical Science, Tatara Miyakodani Kyotanabe, Kyoto 610 – 0321, Japan. E-mail [email protected] (Circulation. 2008;118:2669-2671.) © 2008 American Heart Association, Inc. Circulation is available at http://circ.ahajournals.org DOI: 10.1161/CIRCULATIONAHA.108.837054 importance of blood pressure–lowering strategies.2 Recent data show that in the Asia-Pacific region, there is clear evidence of the hazards of higher blood pressure at all levels of cholesterol and of the hazards of higher cholesterol at all levels of blood pressure as reported in the Western population.5 Stroke is a major cause of death and disability in most populations of eastern Asia, and the incidence, particularly of hemorrhagic stroke, is generally higher than in the Western population. The Eastern Stroke and Coronary Heart Disease Collaborative Research Group assessed the contributions of blood pressure and blood cholesterol concentration to stroke risk in populations from eastern Asia and reported that blood pressure is an important determinant of stroke risk, whereas cholesterol concentration is less important, affecting the proportions of stroke subtypes more than overall stroke numbers.6 This themed issue provides information on the association between risk factors and cardiovascular disease, as evidenced by studies carried out in the Asia-Pacific region, and it highlights different modifiable factors that may influence heart disease. Socioeconomic Status and Cardiovascular Diseases There is a considerable body of evidence for a relation between socioeconomic factors and all-cause mortality. Studies carried out in developed countries provide convincing evidence of an inverse relationship between socioeconomic status and cardiovascular disease, primarily coronary artery disease7 and stroke.8 However, this relation is quite variable, and a growing vulnerability to coronary heart disease has been shown in lower socioeconomic groups.9 In the Asia-Pacific region, many countries are attaining economic development, and as this region undergoes a transition to a Western lifestyle, living more sedentary lives and consuming foods with higher energy and fat, cardiovascular disease is increasing.10 The proportion of overweight individuals is increasing very rapidly in China, especially among adults, associated with an increase in hypertension and stroke. In India, the shift is most pronounced among urban residents and high-income rural residents with adult-onset diabetes.11 In rapidly developing economies, income inequality and the double burden of undernutrition and overnutrition has brought about the coexistence of diseases associated with both poverty and affluence.12 The negative consequences of economic development have been shown in many lower- and middle-income countries in the Asia-Pacific region.13 Governments are expected to implement a strong intervention policy to prevent obesity, particularly among children, in these countries.14 The review of the Asian-Pacific Cohort Collaboration provides valuable insight into this matter. 2669 GEN HOSPITAL on December 23, 2008 Downloaded from circ.ahajournals.org at TAIVET 2670 Circulation December 16/23, 2008 Racial Difference in Cardiovascular Diseases Cardiovascular disease may affect different races differently. Genetic factors appear to contribute to the ethnic differences in the prevalence of coronary heart disease as exemplified by Asian Indians in whom the incidence of premature coronary heart disease is among the highest reported for any major ethnic group. This genetic predisposition can be exaggerated by nutritional and environmental factors.15 The profile of cardiovascular disease tends to be different in Asia, where there are more strokes than coronary heart disease events, and strokes are more often hemorrhagic than ischemic compared with the West. Clinical and pathophysiological differences between Asian and white patients are noted in many aspects of heart disease. The incidence of organic coronary artery disease, a major cause of heart failure in Western countries, is relatively low in East Asian countries. The age-adjusted death rate resulting from ischemic heart disease in Japan has been estimated to be one-sixth that observed in the United States.16 The study comparing the posthospital outcomes of acute myocardial infarction in Japanese and North Americans during an average follow-up of 26 months revealed a significantly greater risk of experiencing a primary end point of cardiac death, nonfatal myocardial infarction, or unstable angina in North American patients.17 Despite a lower incidence of organic coronary artery disease, vasomotor angina is reported to be more common in East Asia. Oriental patients with recent myocardial infarction have greater coronary vasoreactivity than their white counterparts, and spasm is more important in the pathogenesis of myocardial infarction in oriental patients.18 The first comparative study of coronary spasm across racial groups19 recruited patients by the same criteria, using the same provocative tests applied by the same team of investigators and centralized analysis of the angiograms. In this study, focal or segmental spasm was observed in 80% of Japanese and 37% of white patients. The spastic response increased from proximal to distal coronary segments in both populations, but the rate was significantly higher in Japanese in all segments. Medical treatment carried out during the acute phase of myocardial infarction differed significantly between the 2 racial groups. It is of particular interest that the greater use of calcium antagonist in Japanese was proportional to the difference in the incidence of vasospastic angina. On the basis of these findings, it was suggested that coronary spasm is more important in Japan as the pathogenesis of myocardial infarction. These ethnic differences are reflected in the interventional strategies summarized in this issue. The racial difference in therapeutic strategies is also exemplified by the use of inotropic agents in chronic treatment of heart failure. Several extensive clinical trials carried out in Western society have revealed that newly synthesized orally active inotropic agents that increase the concentration of intracellular cAMP either by promoting its synthesis by -adrenergic receptor agonists or by inhibiting its degradation by phosphodiesterase inhibitors produce a dramatic short-term hemodynamic benefit in patients with advanced heart failure, yet the long-term use of these agents is associated with mortality excess. Therefore, all of these agents are now contraindicated for the treatment of chronic heart failure. However, patients enrolled in heart failure trials in Western countries do not represent typical patients encountered in Japan. Similar studies of these agents carried out in Japan demonstrated that inotropes favorably modified the prognosis and quality of life of heart failure patients without affecting mortality. Therefore, in Japanese patients, chronic therapy with inotropic agents may be justified as the optimal treatment strategy in the context of relief of symptoms and an improved quality of life.20 Diseases Recognized in Asia and the Treatment Developed in Asia This issue also provides several reviews recognizing Asia’s contribution to the discovery of new diseases and the development of new therapeutic strategies. One hundred years ago, a Japanese ophthalmologist, Mikito Takayasu, reported a 21-year-old woman who had some particular retinal anastomotic shunts of arterioles and venules. This condition was later called Takayasu’s arteritis. However, the discovery of Takayasu’s arteritis likely dates back as far as 1830, when Rokushu Yamamoto, an expert in Japanese oriental medicine, described in old Japanese literature a case of a 45-year-old man who initially had high fever and developed pulselessness in the radial and carotid arteries 1 year later.21 The disease is characterized by female predominance and ethnic difference, but its origin is still unknown. Nevertheless, the pathological process of vasculitis is being elucidated by recent progress in vascular biology and immunology. Kawasaki disease is an acute, febrile systemic vasculitis of early childhood in which coronary artery aneurysms may develop in up to 25% of untreated children. Tomisaku Kawasaki saw his first case in January 1961, which he presented as an emergent disease called mucocutaneous ocular syndrome.22 Subsequently, coronary artery thrombosis was found at autopsy of a child previously diagnosed as having mucocutaneous ocular syndrome who died suddenly and unexpectedly. Kawasaki disease is now the most common cause of acquired pediatric heart disease in the developed world.23 Future research may produce new insight into the nature of the disease. In 1990, Sato described a syndrome of an acute onset of peculiar asynergy, which consisted of hypokinesis or akinesis from the mid portion to the apical area and hyperkinesis of the basal area on contrast left ventriculogram without coronary artery stenosis.24 The syndrome was called tako-tsubo cardiomyopathy because the end-systolic left ventriculogram looks like a tako-tsubo, an octopus pot or trap used in Japan. This syndrome initially was thought to be restricted to Japan but has now been shown to be more universal. It is often precipitated by emotional or physical stress, but the precise cause remains unclear. In closing, it is our hope that this issue provides a clear exposition of the current state of cardiovascular disease in Asia and provides readers with a better understanding of some of these diseases, with an emphasis on therapy and insight into specific problems that face patients suffering from cardiovascular disease in Asia and throughout the world. Downloaded from circ.ahajournals.org at TAIVET GEN HOSPITAL on December 23, 2008 Sasayama Disclosures None. References 1. Asia Pacific Cohort Studies Collaboration. The impact of cardiovascular risk factors on the age-related excess risk of coronary heart disease. Int J Epidemiol. 2006;35:1025–1033. 2. Martiniuk AL, Lee CM, Lawes CM, Ueshima H, Suh I, Lam TH, Gu D, Feigin V, Jamrozik K, Ohkubo T, Woodward M, for the Asia-Pacific Cohort Studies Collaboration. Hypertension: its prevalence and population-attributable fraction for mortality from cardiovascular disease in the Asia-Pacific region. J Hypertens. 2007;25:73–79. 3. Yeo KK, Tai BC, Heng D, Lee JM, Ma S, Hughes K, Chew SK, Chia KS, Tai ES. Ethnicity modifies the association between diabetes mellitus and ischemic heart disease in Chinese, Malays and Asian Indians living in Singapore. Diabetologia. 2006;49:2866 –2873. 4. Chandalia M, Abate N, Garg A, Stray-Gundersen J, Grundy SM. Relationship between generalized and upper body obesity to insulin resistance in Asian Indian men. J Clin Endocrinol Metab. 1999;84:2329 –2335. 5. Asia Pacific Cohort Studies Collaboration. Joint effects of systolic blood pressure and serum cholesterol on cardiovascular disease in the Asia Pacific region. Circulation. 2005;112:3384 –3390. 6. Eastern Stroke and Coronary Heart Disease Collaborative Research Group. Blood pressure, cholesterol, and stroke in eastern Asia. Lancet. 1998;352:1901–1907. 7. Kaplan GA, Keil JE. Socioeconomic factors and cardiovascular disease: a review of the literature. Circulation. 1993;88:1973–1998. 8. Cox AM, McKevitt C, Rudd AG, Wolfe CD. Socioeconomic status and stroke. Lancet Neurol. 2006;5:181–188. 9. Reddy KS, Prabhakaran D, Jeemon P, Thankappan KR, Joshi P, Chaturvedi V, Ramakrishnan L, Ahmed F. Educational status and cardiovascular risk profile in Indians. Proc Natl Acad Sci. 2007;104: 16263–16268. 10. Xu F, Ah Tse L, Yin X, Yu IT, Griffiths S. Impact of socio-economic factors on stroke prevalence among urban and rural residents in Mainland China. BMC Public Health. 2008;8:170 –179. 11. Popkin BM, Horton S, Kim S, Mahal A, Shuigao J. Trends in diet, nutritional status, and diet-related noncommunicable diseases in China and India: the economic costs of the nutrition transition. Nutr Rev. 2001;59:379 –390. 12. Subramanian SV, Kawachi I, Smith GD. Income inequality and the double burden of under- and overnutrition in India. J Epidemiol Community Health. 2007;61:802– 809. Heart Disease in Asia 2671 13. Asia Pacific Cohort Studies Collaboration. The burden of overweight and obesity in the Asia-Pacific region. Obes Rev. 2007;8:191–196. 14. McCormick B, Stone I. Economic costs of obesity and the case for government intervention. Obes Rev. 2007;8(suppl 1):161–164. 15. Enas EA, Yusuf S, Mehta J. Meeting of the International Working Group on Coronary Artery Disease in South Asians: 24 March 1996, Orlando, Florida, USA. Indian Heart J. 1996;48:727–732. 16. Baba S, Ozawa H, Sakai Y, Terao A, Konishi M, Tatara K. Heart disease death in Japanese urban area evaluated by clinical and police records. Circulation. 1994;89:109 –115. 17. Nakamura Y, Kawai C, Moss AJ, Raubertas RF, Brown MW, Kinoshita M, Sasayama S, Nonogi H, Omae T, Tamaki S, Fujita M, Tanaka N, Hosoda S, Inoue H, Sugimoto T, Iinuma H, Kato K, Tamaki N, Sugiura N. Comparison between Japan and North America in the post-hospital course after recovery from an acute coronary event. Int J Cardiol. 1996; 55:245–254. 18. Beltrame J, Sasayama S, Maseri A. Racial heterogeneity in coronary artery vasomotor reactivity: differences between Japanese and Caucasian patients. J Am Coll Cardiol. 1999;33:1442–1452. 19. Pristipino C, Beltrame JF, Finocchiaro ML, Hattori R, Fujita M, Mongiardo R, Cianflone D, Sanna T, Sasayama S, Maseri A. Major racial differences in coronary constrictor response between Japanese and Caucasians with recent myocardial infarction. Circulation. 2000;101: 1102–1108. 20. Effects of Pimobendan on Chronic Heart Failure Study (EPOCH Study). Effects of pimobendan on adverse cardiac events and physical activities in patients with mild to moderate chronic heart failure: the Effects of Pimobendan on Chronic Heart Failure Study (EPOCH study). Circ J. 2002;66:149 –157. 21. Numano F. The story of Takayasu arteritis. Rheumatology. 2002;41: 103–106. 22. Burns JC, Kushner HI, Bastian JF, Shike H, Shimizu C, Matsubara T, Turner CL. Kawasaki disease: a brief history. Pediatrics. 2000;106: E27–E35. 23. Kushner HI, Bastian JF, Turner CL, Burns JC. The two emergencies of Kawasaki syndrome and the implications for the developing world. Pediatr Infect Dis J. 2008;27:377–383. 24. Tsuchihashi K, Ueshima K, Uchida T, Oh-mura N, Kimura K, Owa M, Yoshiyama M, Miyazaki S, Haze K, Ogawa H, Honda T, Hase M, Kai R, Morii I, for the Angina Pectoris–Myocardial Infarction Investigations in Japan. Transient left ventricular apical ballooning without coronary artery stenosis: a novel heart syndrome mimicking acute myocardial infarction. J Am Coll Cardiol. 2001;38:11–18. KEY WORDS: Editorials 䡲 Asia 䡲 heart disease Downloaded from circ.ahajournals.org at TAIVET GEN HOSPITAL on December 23, 2008