Atherosclerosis frequently occurs at the carotid bifurcation
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1 Prevalence of Carotid Artery Stenosis in Patients With Coronary Artery Disease in Japanese Population Shuzou Tanimoto, MD; Yuji Ikari, MD, PhD; Kengo Tanabe, MD, PhD; Sen Yachi, MD; Hiroyoshi Nakajima, MD, PhD; Tomohiro Nakayama, MD; Mitsuharu Hatori, MD; Gaku Nakazawa, MD; Yoshinobu Onuma, MD; Yasutomi Higashikuni, MD; Hirosada Yamamoto, MD; Eiichi Tooda, RMS; Kazuhiro Hara, MD, PhD Background and Purpose Prevalence of carotid artery stenosis in patients with coronary artery disease (CAD) is unknown in Japanese population. Methods The study populations consisted of 632 consecutive patients who underwent coronary angiography because of suspicion of CAD. All patients underwent carotid ultrasonography to screen carotid artery stenosis before coronary angiography. We defined echographic carotid stenosis as area stenosis of 50% or peak systolic velocity of 200 cm/s. Results Echographic carotid stenosis was observed in 124 patients (19.6%). Coronary angiography revealed 433 patients had CAD. Prevalence of echographic carotid artery stenosis was 14 of 199 (7.0%), 18 of 124 (14.5%), 28 of 131 (21.4%), and 64 of 178 (36.0%) in patients with 0-, 1-, 2-, and 3-vessel CAD, respectively (P ). The prevalence rate with carotid stenosis and CAD was 25.4%. Multivariate stepwise logistic regression analysis showed that age and the extent of CAD were independently related to the presence of carotid stenosis (P and , respectively). Conclusions Prevalence of carotid stenosis in patients with CAD is high in Japan as well as in Western countries. Screening of carotid artery stenosis is recommended especially in older patients with multivessel CAD. (Stroke. 2005; 36: ) Key Words: carotid stenosis coronary artery disease epidemiology Japan Atherosclerosis frequently occurs at the carotid bifurcation and the proximal internal carotid artery. Carotid atherosclerosis is an important cause of ischemic brain attack and stroke. In Western countries, extracranial carotid atherosclerosis accounts for 30% to 40% of cases of ischemic cerebrovascular disease, depending on the population studied. 1 It was reported that there were racial differences in the severity and distribution of carotid atherosclerosis. 2 Compared with patients in Western countries, Japanese patients had predominantly intracranial artery lesions, and extracranial carotid stenoses were less frequent. 3 5 But recently, the incidence of ischemic cerebrovascular disease attributable to extracranial carotid lesions has steadily increased in the Japanese population because of the change in lifestyle toward Western habit. 6 An association between carotid atherosclerosis and coronary artery disease (CAD) has been well established 7 9 because atherosclerosis is considered to be a generalized disease. It has been reported that Japanese patients who underwent coronary artery bypass grafting (CABG) because of severe CAD had a high incidence of carotid stenosis. 10,11 But there are few reports about the complication rate of carotid artery disease in Japanese patients with CAD other than the candidates for bypass surgery. The aim of this study was to investigate the prevalence of carotid stenosis in patients with CAD and to determine any factors related to carotid stenosis in Japanese population. Methods Study Population The study populations consisted of 632 consecutive patients who were scheduled to undergo coronary angiography because of suspicion of CAD during the period June 2002 to April Subjects were administered a questionnaire to assess symptoms, risk factor profile, and previous diagnostic evaluations. All patients gave written informed consent to participate in this study. Evaluation of Risk Factor Variables We evaluated the risk factor variables including sex, age, body mass index, hypertension, diabetes mellitus, hyperlipidemia, smoking, familial history of CAD, hemodialysis, past history of myocardial infarction, previous percutaneous coronary intervention and CABG, and previous transient ischemic attack or stroke. Hypertension was defined as present if a subject took medication for hypertension or if the subject s blood pressure was 140 mm Hg in systole or 90 mm Hg in diastole for 2 repeated measurements. Diabetes mellitus was defined as a serum glycosylated hemoglobin Received April 7, 2005; final revision received June 8, 2005; accepted July 12, From the Division of Cardiology, Mitsui Memorial Hospital, Tokyo, Japan. Reprint requests to Shuzou Tanimoto, Department of Interventional Cardiology, Thorax Center, H922, Dr. Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands. Shuzou_bushido@msn.com 2005 American Heart Association, Inc. Stroke is available at DOI: /01.STR e 2094
2 Tanimoto et al Carotid Stenosis in Patients With CAD in Japan 2095 concentration of 5.8%, if the repeated fasting plasma glucose exceeded 126 mg/dl, or if the patients took medication for diabetes. Hyperlipidemia was defined as taking lipid-lowering medications, a fasting serum total cholesterol concentration of 220 mg/dl, lowdensity lipoprotein cholesterol concentration of 140 mg/dl, highdensity lipoprotein cholesterol concentration of 40 mg/dl, or triglyceride concentration of 150 mg/dl. A familial history of CAD was defined as a history of CAD in any first-degree relatives 60 years of age. Hemodialysis was defined as undergoing maintenance hemodialysis regardless of etiology. Assessment of Coronary Angiography Coronary angiography was performed to investigate CAD. The diameter stenosis was calculated by quantitative coronary angiography with an automated coronary analysis system (CMS Medis Medical Imaging Systems). CAD was defined as a lumen diameter stenosis of 50% in 1 major coronary artery. Each patient was classified into 1 of the following groups according to the number of diseased vessels: 0-vessel disease (ie, patients without diseased vessels [group 0]), 1-vessel disease (ie, patients with disease in 1 vessel [group 1]), 2-vessel disease (ie, patients with disease in 2 vessels or left main trunk disease without right coronary artery stenosis [group 2]), 3-vessel disease (ie, patients with disease in 3 vessels or left main trunk disease with right coronary artery stenosis [group 3]). Assessment of Carotid Atherosclerosis Atherosclerosis of carotid artery was analyzed by duplex ultrasound scanning within a month before coronary angiography in the all enrolled patients. A commercially available machine (Vingmed; General Electric) with a 10-MHz linear array transducer was used. Imaging was performed while subjects were lying in a supine position with the head turned away from the side being scanned and the neck extended. Transverse and longitudinal scans were obtained on the common carotid artery, the carotid bifurcation, and the internal and external carotid artery by B-mode and color Doppler ultrasound. Area stenosis (percent) was measured as: [1 (the area of residual lumen/the area of the normal vessels)] 100 by B-mode ultrasound. Doppler spectral analysis can determine the peak systolic velocity (PSV) by sampling at the area of turbulence. The PSV was measured only when the turbulence was found. To measure blood flow velocity on longitudinal scans, a 5- to 7-mm sample was set in the carotid artery and displayed as linearly as possible. Special care was taken to maintain the incident angle between the carotid artery and the beam at 30 to 60. We defined echographic carotid artery stenosis as the carotid atherosclerosis with area stenosis of 50% or PSV of 200 cm/s on the common carotid artery, the carotid bifurcation, and the internal carotid artery. Coronary angiography and carotid angiography were performed when echographic carotid artery stenosis was identified. Selective carotid angiography was performed in lateral and frontal views. The view showing the maximum stenosis was selected for quantitative angiographic analysis. The lumen diameter at the point of maximum stenosis and the diameter of the normal distal internal carotid artery were measured; percent stenosis was then calculated using the method described in the North American Symptomatic Carotid Endarterectomy Trial (NASCET) study. 12 We defined angiographic carotid stenosis, according to the NASCET criteria, as a diameter stenosis of 70% on the common carotid artery, the carotid bifurcation, and the internal carotid artery. Statistical Analysis Data analysis was performed using the SAS version 8.02 (SAS Institute Inc). Continuous variables were expressed as mean SD. Two-sided unpaired t test was performed for continuous variables and 2 test (or Fisher s exact test when appropriate) for discrete variables. Multivariate stepwise logistic regression analysis was performed to detect independent predictors of carotid artery stenosis using factors that had significant relation in univariate analysis. A value of P 0.05 was considered statistically significant. TABLE 1. Patient Characteristics No. of Patients 632 Male/female 476/156 Age (34 89) Body mass index Hypertension (%) 413 (65.4) Diabetes mellitus (%) 184 (29.1) Hyperlipidemia (%) 444 (70.3) Current smoking (%) 140 (22.2) Familial history of CAD (%) 148 (23.4) Hemodialysis (%) 79 (12.5) Past history of MI (%) 147 (23.3) Prior PCI (%) 156 (24.7) Prior CABG (%) 71 (11.2) Previous TIA/stroke (%) 54 (8.5) 0-vessel disease (%) 199 (31.4) 1-vessel disease (%) 124 (19.6) 2-vessel disease (%) 131 (20.7) 3-vessel disease (%) 178 (28.2) MI indicates myocardial infarction; PCI, percutaneous coronary intervention; TIA, transient ischemic attack. Results We studied 632 consecutive patients (476 men; mean age ; range 35 to 89 years). The demographic and clinical characteristics of the entire study population are presented in Table 1. Among all the enrolled patients, echographic carotid stenosis was found in 124 patients (19.6%). In coronary angiography, CAD was present in 433 patients (68.5%). A total of 124 patients (19.6%) had 1-vessel disease, 131 patients (20.7%) had 2-vessel disease, and 178 patients (28.2%) had 3-vessel disease. Univariate analysis revealed that the following factors were associated with echographic carotid stenosis: age, hypertension, diabetes mellitus, past history of myocardial infarction, previous CABG, and the extent of CAD (Table 2). From these factors, multivariate stepwise logistic regression analysis selected age (P ) and the extent of CAD (P ) as the independent predictors of the presence of echographic carotid stenosis (Table 3). We also analyzed angiographic carotid stenosis based on the NASCET criteria. Of the 124 patients with echographic carotid stenosis, 46 had no available carotid angiography because of severe renal dysfunction (n 6), the difficulty of selective cannulation to carotid artery (n 7), onset of acute coronary syndrome before coronary angiography (n 20), and no patient s consent (n 13). These 46 patients were excluded from the postanalysis because of unavailable carotid angiography. Carotid angiography was performed in the residual 78 patients. We found angiographic carotid stenosis in 47 patients. Univariate analysis revealed that the following factors were associated with angiographic carotid stenosis: age, hypertension, diabetes mellitus, past history of myocardial infarction, previous CABG, and the extent of CAD (Table 4).
3 2096 Stroke October 2005 TABLE 2. Univariate Analysis of Echographic Carotid Stenosis TABLE 4. Univariate Analysis of Angiographic Carotid Stenosis Echographic Carotid Stenosis Angiographic Carotid Stenosis Variables Yes, n 124 No, n 508 P value Male (%) 96 (77.4) 380 (74.8) Age Body mass index Hypertension (%) 91 (73.4) 322 (63.4) Diabetes mellitus (%) 48 (38.7) 136 (26.8) Hyperlipidemia (%) 88 (71.0) 356 (70.1) Current smoking (%) 32 (25.8) 108 (21.3) Familial history of CAD (%) 31 (25.0) 117 (23.0) Hemodialysis (%) 16 (12.9) 63 (12.4) Past history of MI (%) 40 (32.3) 107 (21.1) Prior PCI (%) 39 (31.5) 117 (23.0) Prior CABG (%) 26 (21.0) 45 (8.9) vessel disease (%) 14 (11.3) 185 (36.4) CAD (%) 110 (88.7) 323 (63.6) vessel disease vessel disease vessel disease Multivessel disease (%) 92 (74.2) 217 (42.7) MI indicates myocardial infarction; PCI, percutaneous coronary intervention. From these factors, multivariate stepwise logistic regression analysis selected age (P ) and the extent of CAD (P ) as the independent predictors of the presence of severe carotid stenosis (Table 3). The extent of CAD had a strong association with echographic and angiographic carotid stenosis in univariate as well as multivariate analysis. We performed further analysis on the distribution of carotid stenoses according to the extent of CAD (Figure). The distribution of echographic carotid stenosis in the groups with degrees of CAD was 7.0%, 14.5%, 21.4%, and 36.0% of patients with 0-, 1-, 2-, and 3-vessel disease, respectively (P ). The distribution of angiographic carotid artery stenosis in the groups with degrees of CAD was 2.1%, 3.4%, 7.5%, and 19.4% of patients with 0-, 1-, 2-, and 3-vessel disease, respectively (P ). There was a stepwise increase in the number of patients with echographic or angiographic carotid stenosis among the patients with increasing severity of CAD. In patients with CAD, 25.4% had echographic stenosis, and 11.0% had TABLE 3. Stenosis Multivariate Stepwise Logistic Regression of Carotid Echographic Carotid Stenosis Variables Odds Ratio 95% CI P Value Age Extent of CAD Angiographic Carotid Stenosis Variables Odds Ratio 95% CI P Value Age Extent of CAD Variables Yes (n 47) No (n 539) P value Male (%) 40 (85.1) 407 (75.5) Age Body mass index Hypertension (%) 38 (80.9) 341 (63.3) Diabetes mellitus (%) 20 (42.6) 144 (26.7) Hyperlipidemia (%) 34 (72.3) 378 (70.1) Current smoking (%) 14 (29.8) 117 (21.7) Familial history of CAD (%) 9 (19.2) 127 (23.7) Hemodialysis (%) 7 (17.5) 66 (12.2) Past history of MI (%) 19 (40.4) 115 (21.3) Previous PCI (%) 15 (31.9) 130 (24.1) Previous CABG (%) 10 (21.3) 51 (9.5) vessel disease (%) 4 (8.5) 190 (18.6) CAD (%) 43 (91.5) 349 (64.7) vessel disease vessel disease vessel disease Multivessel disease (%) 39 (82.3) 236 (43.8) MI indicates myocardial infarction; PCI, percutaneous coronary intervention. angiographic carotid stenosis. The prevalence of echographic or angiographic carotid stenoses were 14.5% or 3.4%, respectively, in 1-vessel disease, whereas it was 29.8% or 14.2%, respectively, in multivessel disease (P ). Discussion In this study, our main findings were: (1) the prevalence of carotid stenosis in patients with CAD was unexpectedly high in the sample Japanese population, and (2) age and the extent of CAD were independently related to the presence of carotid stenosis. In the 1960s, there were few people in Japan with atherosclerosis in the extracranial carotid artery. 3 5 But the incidence of extracranial carotid atherosclerosis has increased in the past few decades with the change in lifestyle toward Western habits. 6 In 1997, Mannami T et al 13 reported that the incidence of carotid stenosis defined as area stenosis of 50% on ultrasound was 4.4% among Japanese people 50 years of age. In the present study, carotid stenosis was seen in 7% of patients without CAD. Colgan et al 14 reported that in Western countries, 4% of 348 participants scanned at a health fair, whose average age was 61 years, had carotid stenoses of 50%. Pujia et al 15 reported that the prevalence of carotid stenosis of 50% was 5% in subjects 75 years of age. In the Framingham Study, 16 8% of the 1189 members of the cohort 66 to 93 years of age had carotid stenosis of 50%. Taking these results into consideration, at present, the prevalence of carotid stenosis in Japan may be similar to that of Western countries. It is well known that carotid atherosclerosis strongly correlated with CAD. In the severe CAD patients who were scheduled to undergo CABG, the complication rate of carotid
4 Tanimoto et al Carotid Stenosis in Patients With CAD in Japan 2097 Distribution of carotid stenosis according to the extent of CAD. VD indicates vessels disease. Open bars represent echographic carotid stenosis. Shaded boxes represent angiographic carotid stenosis. stenosis was 2% to 18% in Western countries, whereas for the Japanese population, it was 13.7%. 25 But the prevalence of carotid stenosis in patients with CAD other than the candidates for bypass surgery has not been well evaluated. In our study, the prevalence of echographic carotid stenosis with multivessel CAD was 29.8%. We also analyzed angiographic carotid stenosis in this study. Angiographic carotid stenosis is important for prognosis and to decide on surgical or interventional treatment. However, there have been few reports about the relationship between angiographic carotid stenosis and CAD. Our study showed that 19.4% of patients with 3-vessel disease had angiographic carotid stenosis and may require both coronary and carotid intervention. Histological relationship between carotid and coronary atherosclerosis has been seen in an autopsy study. 26 The histological relationship may explain the high complication rate. Open-heart surgery in patients without carotid atherosclerosis carries a risk of stroke of 1% to 2%, but in the presence of unoperated major carotid stenosis, it is associated with a 14% risk of perioperative stroke. 23,27 29 Prognosis of CAD has improved in the past few years because of improvement in coronary revascularization. But neurologic complication represents the most frequent cause of mortality in patients undergoing myocardial revascularization. 30 Therefore, it should be recommended that the patients with CAD, especially those with multivessel CAD, undergo carotid ultrasonography for screening of carotid atherosclerosis before treatment for CAD. Screening of carotid stenosis in patients with CAD seems insufficient in Japan at present, probably because the prevalence rate of carotid stenosis has been considered to be low in Japanese population. Previous studies 10,11 reported high complication rates between carotid artery stenosis and severe CAD in patients undergoing coronary bypass surgery. Our study, including less severe CAD as well as severe CAD, supported these previous studies. The patients with CAD, especially those with multivessel CAD, should undergo carotid ultrasonography in Japan, as in Western countries. There may be limitations in this study. First, we only studied a group of consecutive patients who were referred for coronary angiography because of suspected CAD. Second, a mean age of patients in this study was high. The prevalence of multivessel CAD was higher in advanced age, and the extent of CAD was affected with the integration of coronary risk factors including age. These selection biases could mean that our findings regarding the relationship between carotid stenosis and CAD are relevant only to this specific group and may not be applicable to the general population. In conclusion, prevalence of carotid stenosis in patients with CAD is high in Japan as well as in Western countries, and screening of carotid artery stenosis should be recommended in patients with CAD, especially in older patients with multivessel CAD. References 1. Sacco RL, Ellenberg JH, Mohr JP, Tatemichi TK, Hier DB, Price TR, Wolf PA. Infarcts of undetermined cause: the NINCDS Stroke Data Bank. Ann Neurol. 1989;25: Heyman A, Fields WS, Keating RD. Joint study of extracranial arterial occlusion. VI. Racial differences in hospitalized patients with ischemic stroke. J Am Med Assoc. 1972;222: Kieffer SA, Takeya Y, Resch JA, Amplatz K. Racial differences in cerebrovascular disease. Angiographic evaluation of Japanese and American populations. 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Arch Intern Med. 1985;145: O Leary DH, Polak JF, Kronmal RA, Kittner SJ, Bond MG, Wolfson SK Jr, Bommer W, Price TR, Gardin JM, Savage PJ. Distribution and correlates of sonographically detected carotid artery disease in the cardiovascular health study. The CHS Collaborative Research Group. Stroke. 1992;23: Fukuda I, Osaka M, Nakata H, Sakamoto H. Clinical outcome for coronary artery bypass grafting in patients with severe carotid occlusive disease. J Cardiol. 2001;38: Uekita K, Funayama N, Nishiura T, Makiguchi N, Sakamoto N, Aoyama H, Kataoka R, Hasebe N, Kikuchi K. Prevalence of cervical and cerebral atherosclerosis and silent brain infarction in patients with multivessel coronary artery disease. J Cardiol. 2001;38:13 20.
5 2098 Stroke October Risk of stroke in the distribution of an asymptomatic carotid artery. The European Carotid Surgery Trialists Collaborative Group. Lancet. 1995; 345: Mannami T, Konishi M, Baba S, Nishi N, Terao A. Prevalence of asymptomatic carotid atherosclerotic lesions detected by high-resolution ultrasonography and its relation to cardiovascular risk factors in the general population of a Japanese city: the Suita Study. Stroke. 1997;28: Colgan MP, Strode GR, Sommer JD, Gibbs JL, Sumner DS. Prevalence of asymptomatic carotid disease: results of duplex scanning in 348 unselected volunteers. J Vasc Surg. 1988;8: Pujia A, Rubba P, Spencer MP. Prevalence of extracranial carotid artery disease detectable by echo-doppler in an elderly population. Stroke. 1992;23: O Leary DH, Anderson KM, Wolf PA, Evans JC, Poehlman HW. Cholesterol and carotid atherosclerosis in older persons: the Framingham Study. Ann Epidemiol. 1992;2: Brener BJ, Brief DK, Alpert J, Goldenkranz RJ, Parsonnet V, Feldman S, Gielchinsky I, Abel RM, Hochberg M, Hussain M. A four-year experience with preoperative noninvasive carotid evaluation of two thousand twenty-six patients undergoing cardiac surgery. J Vasc Surg. 1984;1: Barnes RW, Nix ML, Sansonetti D, Turley DG, Goldman MR. Late outcome of untreated asymptomatic carotid disease following cardiovascular operations. J Vasc Surg. 1985;2: Cosgrove DM, Hertzer NR, Loop FD. Surgical management of synchronous carotid and coronary artery disease. J Vasc Surg. 1986;3: Brener BJ, Brief DK, Alpert J, Goldenkranz RJ, Parsonnet V. The risk of stroke in patients with asymptomatic carotid stenosis undergoing cardiac surgery: a follow-up study. J Vasc Surg. 1987;5: Minami K, Sagoo KS, Breymann T, Fassbender D, Schwerdt M, Korfer R. Operative strategy in combined coronary and carotid artery disease. J Thorac Cardiovasc Surg. 1988;95: Hertzer NR, Loop FD, Beven EG, O Hara PJ, Krajewski LP. Surgical staging for simultaneous coronary and carotid disease: a study including prospective randomization. J Vasc Surg. 1989;9: Faggioli GL, Curl GR, Ricotta JJ The role of carotid screening before coronary artery bypass. J Vasc Surg. 1990;12: Turnipseed WD, Berkoff HA, Belzer FO. Postoperative stroke in cardiac and peripheral vascular disease. Ann Surg. 1980;192: Kawarada O, Yokoi Y, Morioka N, Nakata S, Higashiue S, Mori T, Iwahashi M, Hatada A. Carotid stenosis and peripheral artery disease in Japanese patients with coronary artery disease undergoing coronary artery bypass grafting. Circ J. 2003;67: Mitchell JR, Schwartz CJ. Relationship between arterial disease at different sites. BMJ. 1962;1: Rizzo RJ, Whittemore AD, Couper GS, Donaldson MC, Aranki SF, Collins JJ Jr, Mannick JA, Cohn LH. Combined carotid and coronary revascularization: the preferred approach to the severe vasculopath. Ann Thorac Surg. 1992;54: Dawson DL, Zierler RE, Strandness DE Jr, Clowes AW, Kohler TR. The role of duplex scanning and arteriography before carotid endarterectomy: a prospective study. J Vasc Surg. 1993;18: Pillai L, Gutierrez IZ, Curl GR, Gage AA, Balderman SC, Ricotta JJ. Evaluation and treatment of carotid stenosis in open-heart surgery patients. J Surg Res. 1994;57: Puskas JD, Winston AD, Wright CE, Gott JP, Brown WM III, Craver JM, Jones EL, Guyton RA, Weintraub WS. Stroke after coronary artery operation: incidence, correlates, outcome, and cost. Ann Thorac Surg. 2000;69:
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