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The Journal of Clinical Endocrinology & Metabolism Vol. 83, No. 8 2773-2776
Copyright © 1998 by The Endocrine Society


Original Studies

Resistance to Insulin-Mediated Glucose Disposal as a Predictor of Cardiovascular Disease

Jeannie Yip, Francesco S. Facchini and Gerald M. Reaven

Department of Medicine, Stanford University School of Medicine, Stanford, California; and Shaman Pharmaceuticals, Incorporated, South San Francisco, California 94080-4812

Address all correspondence and requests for reprints to: Gerald M. Reaven, Shaman Pharmaceuticals, Incorporated, 312 East Grand Avenue, South San Francisco, California 94080-4812. E-mail: greaven{at}shaman.com


    Abstract
 Top
 Abstract
 Introduction
 Methods
 Results
 Discussion
 References
 
Resistance to insulin-mediated glucose disposal has been postulated to predispose individuals to a cluster of associated abnormalities (Syndrome X) known to increase risk of cardiovascular disease (CVD). Although several abnormalities subsumed under the rubric of Syndrome X have been shown to predict CVD, there has been no prospective study evaluating the power of insulin resistance, the putative fundamental defect in the syndrome, in this context. Therefore, this study was initiated to evaluate the hypothesis that resistance to insulin-mediated glucose disposal would predict the development of CVD in healthy volunteers. To accomplish this goal, 147 normal, healthy, nonobese, volunteers were evaluated [4.7 ± 0.1 yr (mean ± SEM)] after baseline measurements of steady state plasma glucose concentration (an estimate of insulin-mediated glucose disposal), as well as other CVD risk factors.

Clinical end points developed in 13 subjects during the follow-up period; hypertension in 5, coronary artery disease in 4, cerebrovascular accident in 3, and peripheral vascular disease in 1. There was a significant univariate relationship between SSPG and CVD (P < 0.002), with the majority of the events taking place in the tertile of subjects with the highest SSPG concentration, i.e. the greatest degree of insulin resistance. In contrast, no CVD events were observed in the tertile with the lowest SSPG concentrations; the most insulin sensitive. SSPG was also related significantly to diastolic blood pressure, triglyceride, and low-density lipoprotein and high-density lipoprotein cholesterol concentrations, and the glucose and insulin responses to oral glucose. All of these relationships were independent of age, gender, body mass index, estimates of physical activity, and smoking history. When SSPG was paired with each of the other variables in a series of multiple regression models, only SSPG, or insulin response, were independent predictors of CVD events.

In conclusion, approximately one of every five healthy, nonobese subjects in the most insulin-resistant tertile, followed for approximately 5 yr, had a serious clinical event. These data highlight the importance of insulin resistance as a predictor of CVD.


    Introduction
 Top
 Abstract
 Introduction
 Methods
 Results
 Discussion
 References
 
THE ability of insulin to stimulate glucose disposal varies widely in a healthy, nondiabetic population, and a substantial number of such individuals are as approximately insulin resistant as are glucose-intolerant subjects (1, 2). What apparently permits insulin-resistant individuals to remain glucose tolerant is their ability to sustain the degree of compensatory hyperinsulinemia needed to overcome the defect in insulin action. Unfortunately, the hyperinsulinemia required to maintain glucose homeostasis has been implicated as a predictor of cardiovascular disease (CVD) in a number of prospective epidemiological studies (3, 4, 5, 6). On the other hand, controversy continues as to the status of hyperinsulinemia as a risk factor for CVD (7, 8). One possible explanation for the lack of consensus may be because of the fact that hyperinsulinemia is only a surrogate measure of insulin resistance and only one of the consequences of this defect (9, 10, 11). Indeed, results of several recent cross-sectional studies have suggested that insulin resistance per se is a more powerful predictor of CVD (12, 13, 14, 15). However, we are unaware of any prospective assessment of the role that differences in insulin-mediated glucose disposal might play as a predictor of CVD events. The study to be presented was initiated to address this issue, and involved the examination of the interaction between insulin resistance, and associated atherosclerotic risk factors, in the development of CVD in healthy, nonobese male and female volunteers followed for a minimum of 4 yr.


    Methods
 Top
 Abstract
 Introduction
 Methods
 Results
 Discussion
 References
 
Of all healthy volunteers recruited for metabolic studies at the Stanford University General Clinical Research Center between 1988–1992, those aged 30 yr or above at recruitment, with body mass index (BMI) <=30 kg/m2 were contacted by mail in 1995/1996 for follow-up.

Baseline evaluation included a physical examination, an electrocardiogram, and a complete blood count, and blood chemistry panel to ensure good general health. All subjects with a past history of CVD or hypertension were excluded, as were individuals with an abnormal electrocardiogram. In addition, a blood pressure (BP) >145/90 mmHg, or a history of taking any medication known to affect glucose or lipid metabolism or hypertension were the basis for exclusion. Baseline measurements included weight, height, sitting BP, and fasting lipid and lipoproteins (16). A 75-g oral glucose tolerance test was done with blood samples for glucose (17) and insulin (18) drawn at 0, 30, 60, 120, and 180 min. The area under the curve was calculated by the trapezoidal formula to estimate the postload glucose and insulin areas. Any subject who was found to be diabetic by oral glucose tolerance according to the WHO criteria was eliminated from the study. Insulin resistance was measured by insulin suppression test as previously described (19). Information on smoking history was obtained. Smokers were those who were currently smoking cigarettes or had done so within the last 5 yr; all others were classified as nonsmokers. Physical activity was measured by the number of physical activities per week that were associated with sweating (20).

At follow-up, each subject was asked about current medication use and history of neurological deficits and asked to complete a screening questionnaire on chest pain and intermittent claudication (21). Whenever there was a positive report for antihypertensive/cardiac medication, chest pain, or calf pain, the subject was interviewed over the telephone by JY/FF and permission sought to contact the primary care physician to clarify the nature of the symptom. For those who could not be reached and failed to return the questionnaire, it was assumed that either they had moved away without leaving a forwarding address or had died. The names of these individuals were submitted to the Office of State Registrar in California for search against the death registry and the examination of the death certificate.

The study end points were the development of hypertension or CVD; the latter category included fatal or nonfatal coronary artery disease, fatal or nonfatal cerebral vascular accident, or peripheral vascular disease. Hypertension was defined by the use of antihypertensive medication. Coronary artery disease included chest pain with positive stress test, percutaneous transluminal angioplasty, coronary bypass surgery, or documented myocardial infarction. Cerebral vascular accident included documented clinical neurological deficit, lasting over 24 h, with or without radiographic evidence. The diagnosis of peripheral vascular disease was made clinically by history and examination, which demonstrated diminished pedal pulses with poor capillary return or arterial ulceration.

All results are expressed as arithmetic or geometric mean ± SE. Results were analyzed by ANOVA and contingency table as appropriate. Nonparametric variables: triglycerides, postload insulin area, and steady state plasma glucose concentration were log-transformed before analysis. Univariate and multivariate logistic regression analyses were used to assess the relationship and interaction of baseline variables and the presence of cardiovascular disease as a categorical outcome.


    Results
 Top
 Abstract
 Introduction
 Methods
 Results
 Discussion
 References
 
One hundred and forty-seven (73 males, 74 females) patients out of a total of 165 subjects (89%) were studied after a follow-up period of 4.7 ± 0.1 yr. The baseline clinical characteristics between those who participated and those lost to follow-up were similar in terms of age (50 ± 1 vs. 48 ± 2 yr) and BMI (24.5 ± 0.2 vs. 24.8 ± 0.5 kg/m2).

A diagnosable disease developed in 13 subjects (6 males, 7 females) during the follow-up period: hypertension in 5, coronary artery disease in 4, cerebral vascular accident in 3, and 1 with peripheral vascular disease. There was one noncardiovascular death reported. The search through the State of California Death Registry between 1989 and the end of 1995 was negative for those individuals who were lost to follow-up.

The relationship between the development of disease, hypertension plus CVD, as a function of tertiles of baseline SSPG, is shown in the top half of Fig. 1Go. It is clear from these data that neither hypertension nor CVD developed in the one third of the population that was most insulin sensitive (tertile I). In contrast, almost one of every five individuals in the most insulin-resistant tertile (tertile III) developed hypertension or CVD during the period of observation.



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Figure 1. Relationship between tertile of SSPG from lowest (tertile I) to highest (tertile III) and incidence of hypertension plus CVD (top) and only CVD (bottom).

 
The bottom half of Fig. 1Go illustrates the incidence at which specific manifestations of CVD developed as a function of degree of insulin resistance. As in the case of the combined events shown above, CVD did not develop in the most insulin-sensitive tertile. In marked contrast, seven of the eight subjects in whom CVD was documented came from the most insulin-resistant tertile.

The baseline characteristics of the three tertiles are seen in Table 1Go. When subjects in the highest tertile (highest SSPG values) were compared with those in the lowest tertile, it can be seen that they differed in multiple variables. To evaluate the link between SSPG and CVD events, it seemed necessary at first to define the relationship between SSPG and its related variables, adjusting for difference in age, gender, BMI, smoking, and estimates of physical activity. The results of this analysis are given in Table 2Go, and it is apparent that SSPG was significantly related to diastolic blood pressure, plasma triglyceride concentration, low-density lipoprotein (LDL) and high-density lipoprotein (HDL) cholesterol concentrations, and the glucose and insulin responses to oral glucose.


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Table 1. Characteristics of 147 subjects divided into tertiles according to baseline steady state plasma glucose concentration

 

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Table 2. Relationship between SSPG and other CVD risk factors—adjusting for age, gender, BMI, exercise, and smoking

 
Based on the relationships shown in Table 2Go, it was not possible to determine whether insulin resistance (SSPG), or some variable related to SSPG, was linked to CVD. Consequently, we ascertained the relationship between SSPG, the variables related to it as seen in Table 2Go, and CVD. The results of this analyses are seen in Table 3Go, and demonstrate the presence of a significant univariate relationship between CVD and diastolic blood pressure, triglyceride and HDL cholesterol concentrations, SSPG, and the plasma glucose and insulin responses to the glucose challenge.


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Table 3. Univariate relationship between SSPG, its associated variables, and CVD

 
Having established the existence of significant relationships between SSPG, as well as other factors related to SSPG, and CVD risk, multiple logistic regression analysis was used in an attempt to estimate the likelihood that the univariate relationship between SSPG and CVD shown in Table 3Go was attributable to insulin resistance, as differentiated from the metabolic abnormalities shown in Table 2Go to be linked to this defect. This was done by comparing the degree to which SSPG and each of the relevant individual variables defined in Table 3Go predicted CVD. These results are shown in Table 4Go, and it is apparent that SSPG remained significantly related to CVD when compared with any of the other individual CVD risk factors. Furthermore, it can be seen that SSPG was the only variable that remained significantly related to CVD when all of the significant factors from Table 3Go were entered into the model. Because SSPG and the insulin response are highly correlated (r = 0.83, P < 0.001), insulin response was not employed in the regression analyses shown in Table 4Go. However, essentially similar results were seen when SSPG was replaced by insulin response.


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Table 4. Multiple logistic regression analysis of relationship between SSPG, its associated variables, and CVD

 

    Discussion
 Top
 Abstract
 Introduction
 Methods
 Results
 Discussion
 References
 
The concept that resistance to insulin-mediated glucose uptake represented a fundamental abnormality that predisposed otherwise healthy individuals to develop a cluster of risk factors for CVD was first clearly articulated in 1988 (9). However, acceptance of the causal relationship between insulin resistance and CVD has been tempered by conflicting results (3, 4, 5, 6, 7, 8) as to the association between hyperinsulinemia (a surrogate measure of insulin resistance) and CVD. One way out of this quandary is to suggest that insulin resistance, not hyperinsulinemia, increases risk of CVD: a conclusion reached in several cross-sectional studies (12, 13, 14, 15). On the other hand, it is not a simple task to differentiate between the role of insulin resistance increasing risk of CVD, as distinguished from any of its consequences. At the least, it should be possible to demonstrate in a prospective study that differences in insulin-mediated glucose disposal predict risk of CVD. As of now, we are unaware of any such study showing that insulin resistance, per se, can predict CVD events. We believe that the results presented provide evidence for the first time that this is the case.

The results shown in Fig. 1Go indicate that the development of hypertension and CVD segregated as a function of degree of insulin resistance (SSPG). Either CVD or hypertension developed in nine subjects (18%) in the tertile with the highest SSPG values, compared to four from the middle (8%), and none from the bottom tertile during the period of follow-up. Focusing on CVD alone, it is apparent that seven of the eight subjects who developed CVD during the period of observation were in the most insulin-resistant tertile. These data provide substantial support for the view that the presence of insulin resistance identifies a subset of the population who will develop CVD over a relatively short time period.

On the other hand, the data in Table 1Go clearly demonstrate that the tertile of the most insulin-resistant subjects share a variety of known risk factors for CVD. Consequently, any effort to identify insulin resistance as the predictor of the observed CVD events must take these other factors into account. This analysis was performed, and results from Table 2Go identify six CVD risk factors that were independently related to SSPG (adjusting for differences in age, gender, BMI and history of smoking and activity level): diastolic blood pressure, triglyceride and LDL and HDL cholesterol concentrations, and the plasma glucose and insulin responses to oral glucose. Furthermore, the results in Table 3Go show that SSPG, as well as all of the above variables (with the exception of LDL cholesterol) were significantly correlated with a CVD event.

The information in Tables 2Go and 3Go were then used in multiple logistic regression analysis with CVD as the outcome, in which SSPG was paired with each of the other variables significantly related to CVD. The results of this analysis are given in Table 4Go, and show that SSPG was the only independent predictor of CVD. When the plasma insulin response to oral glucose was substituted for SSPG in this analysis, the results were quite similar. Thus, when either SSPG or the insulin response were taken into account, none of the other variables associated with SSPG were independently related to CVD events.

Measures of insulin resistance and insulin response were highly correlated in this study (r = 0.83). Consequently, using conventional statistical techniques to decide which of these two variables is the best predictor of CVD is not without problems. At the least, it is necessary that two highly related variables are similar in terms of the inter- and intraindividual variability to make such approaches valid. This is certainly not the case as regards determination of insulin resistance and plasma insulin response to oral glucose. The method used to quantify insulin resistance in this study is somewhat complicated to perform, but provides a precise measure of a specific physiological function that varied from person to person by <10% in 75% of subjects studied on two occasions (22). Although determination of the plasma insulin response to oral glucose is much simpler, it represents a complex function of differences in degree of insulin resistance, pancreatic B-cell function, and peripheral insulin catabolism. As such, it should not be surprising that the plasma insulin concentration, measured 120 min after oral glucose on two occasions within 48 h, varied by >30% in half of those studied (23). Given the difficulties in attempting to differentiate between insulin resistance and compensatory hyperinsulinemia on a statistical basis as the independent risk factor for CVD, we think the only prudent conclusion to draw from this prospective study is that insulin resistance and/or compensatory hyperinsulinemia are predictors of CVD.

Finally, although the results of the present prospective study demonstrate that resistance to insulin-mediated glucose disposal and/or compensatory hyperinsulinemia predict the development of CVD independently of other known risk factors, certain caveats must be emphasized. The experimental population only consisted of 147 volunteers, and hard clinical end points were only seen in 13 subjects and CVD only in 8. On the other hand, neither high blood pressure nor CVD developed in patients in the low SSPG tertile, whereas approximately 1 out of 5 middle-aged volunteers in the highest SSPG tertile developed high blood pressure or had a CVD event within 5 yr. The total number of events may have been modest, but their distribution strongly supports the view that being insulin resistant is a powerful predictor of subsequent CVD.

In conclusion, in this study we have determined the development of hypertension or CVD in a group of healthy volunteers divided into tertiles on the basis of their degree of insulin resistance. At baseline, the most insulin-resistant tertile was shown to have a cluster of risk factors for the two clinical end points, and the correlation between degree of insulin resistance and these CVD risk factors was highly significant. During follow-up period of approximately 5 yr, 18% of the most insulin-resistant group had developed either high blood pressure or had a CVD event. Finally, insulin resistance and/or compensatory hyperinsulinemia were found to predict CVD independently of the other risk factors shared by individuals with these defects.

Received March 11, 1998.

Revised April 20, 1998.

Accepted April 24, 1998.


    References
 Top
 Abstract
 Introduction
 Methods
 Results
 Discussion
 References
 

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  5. Ducimetiere P, Eschwege JL, Papoz JL, et al. 1980 Relationship of plasma insulin levels to the incidence of myocardial infarction and coronary heart disease mortality in middle-aged population. Diabetologia. 19:205–210.[CrossRef][Medline]
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  7. Jarrett RJ. 1994 Why is insulin not a risk factor for coronary heart disease? Diabetologia. 37:945–947.[Medline]
  8. Stern MP. 1994 The insulin resistance syndrome: the controversy is dead, long live the controversy. Diabetologia. 37:956–958.[Medline]
  9. Reaven GM. 1988 Role of insulin resistance in human disease. Diabetes. 37:1595–1607.[Abstract]
  10. Reaven GM. 1995 Pathophysiology of insulin resistance in human disease. Physiol Rev. 75:473–486.[Abstract/Free Full Text]
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M. Alssema, J. M. Dekker, G. Nijpels, C. D.A. Stehouwer, L. M. Bouter, and R. J. Heine
Proinsulin Concentration Is an Independent Predictor of All-Cause and Cardiovascular Mortality: An 11-year follow-up of the Hoorn Study
Diabetes Care, April 1, 2005; 28(4): 860 - 865.
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ANN INTERN MEDHome page
T. McLaughlin and G. Reaven
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Ann Intern Med, August 3, 2004; 141(3): 243 - 244.
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B. Charbonnel, J. Dormandy, E. Erdmann, M. Massi-Benedetti, and A. Skene
The Prospective Pioglitazone Clinical Trial in Macrovascular Events (PROactive): Can pioglitazone reduce cardiovascular events in diabetes? Study design and baseline characteristics of 5,238 patients
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K. L. Cheal, F. Abbasi, C. Lamendola, T. McLaughlin, G. M. Reaven, and E. S. Ford
Relationship to Insulin Resistance of the Adult Treatment Panel III Diagnostic Criteria for Identification of the Metabolic Syndrome
Diabetes, May 1, 2004; 53(5): 1195 - 1200.
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F. Abbasi, J. W. Chu, C. Lamendola, T. McLaughlin, J. Hayden, G. M. Reaven, and P. D. Reaven
Discrimination Between Obesity and Insulin Resistance in the Relationship With Adiponectin
Diabetes, March 1, 2004; 53(3): 585 - 590.
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Z. T. Bloomgarden
The 1st World Congress on the Insulin Resistance Syndrome
Diabetes Care, February 1, 2004; 27(2): 602 - 609.
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G. Reaven, F. Abbasi, and T. McLaughlin
Obesity, Insulin Resistance, and Cardiovascular Disease
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T. McLaughlin, F. Abbasi, K. Cheal, J. Chu, C. Lamendola, and G. Reaven
Use of Metabolic Markers To Identify Overweight Individuals Who Are Insulin Resistant
Ann Intern Med, November 18, 2003; 139(10): 802 - 809.
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G. M. Reaven
Importance of Identifying the Overweight Patient Who Will Benefit the Most by Losing Weight
Ann Intern Med, March 4, 2003; 138(5): 420 - 423.
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L. O'Rourke, L. M. Gronning, S. J. Yeaman, and P. R. Shepherd
Glucose-dependent Regulation of Cholesterol Ester Metabolism in Macrophages by Insulin and Leptin
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F. Abbasi, B. W. Brown Jr, C. Lamendola, T. McLaughlin, and G. M. Reaven
Relationship between obesity, insulin resistance, and coronary heart disease risk
J. Am. Coll. Cardiol., September 4, 2002; 40(5): 937 - 943.
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JAMAHome page
M. C. Stuhlinger, F. Abbasi, J. W. Chu, C. Lamendola, T. L. McLaughlin, J. P. Cooke, G. M. Reaven, and P. S. Tsao
Relationship Between Insulin Resistance and an Endogenous Nitric Oxide Synthase Inhibitor
JAMA, March 20, 2002; 287(11): 1420 - 1426.
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W. A. Hsueh and R. E. Law
PPAR{gamma} and Atherosclerosis: Effects on Cell Growth and Movement
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Am. J. Clin. Nutr.Home page
H.-S. Kim, F. Abbasi, C. Lamendola, T. McLaughlin, and G. M Reaven
Effect of insulin resistance on postprandial elevations of remnant lipoprotein concentrations in postmenopausal women
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D. J. James, F. Cairns, I. P. Salt, G. J. Murphy, A. F. Dominiczak, J. M.C. Connell, and G. W. Gould
Skeletal Muscle of Stroke-Prone Spontaneously Hypertensive Rats Exhibits Reduced Insulin-Stimulated Glucose Transport and Elevated Levels of Caveolin and Flotillin
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F. S. Facchini, N. Hua, F. Abbasi, and G. M. Reaven
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Hum ReprodHome page
M.W. Elting, T.J.M. Korsen, P.D. Bezemer, and J. Schoemaker
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Arch Intern MedHome page
J. Jeppesen, H. O. Hein, P. Suadicani, and F. Gyntelberg
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M. Ai, A. Tanaka, K. Ogita, M. Sekine, F. Numano, F. Numano, and G. M. Reaven
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Insulin Resistance Syndrome Predicts the Risk of Coronary Heart Disease and Stroke in Healthy Middle-Aged Men : The 22-Year Follow-Up Results of the Helsinki Policemen Study
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Relationship Between Insulin Resistance, Soluble Adhesion Molecules, and Mononuclear Cell Binding in Healthy Volunteers
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N.-G. Chen, F. Abbasi, C. Lamendola, T. McLaughlin, J. P. Cooke, P. S. Tsao, and G. M. Reaven
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