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C syndrome

C syndrome (also known as Opitz trigonocephaly syndrome) is a rare congenital disorder. Infants affected by this disorder have a malformated triangular shaped head due to premature union of the skull bones (trigonocephaly), a narrow pointed forehead, a flat broad nasal bridge with a short nose, vertical folds over the inner corners of the eyes, an abnormal palate that is deeply furrowed, abnormalities of the ear, crossed eyes (strabismus), joints that are bent or in a fixed position and loose skin.

The mortality rate during the first year of life is high. The disorder is autosomal recessive inherited. “C” is the first letter of the surname of the affected patients first described, hence the name C syndrome.

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Metabolic syndrome: time for action
From American Family Physician, 6/15/04 by Darwin Deen

Metabolic syndrome, also called insulin resistance syndrome or syndrome X, is a cluster of risk factors that is responsible for much of the excess cardiovascular disease morbidity among overweight and obese patients and those persons with type 2 diabetes mellitus. (1) Differences in body-fat distribution (i.e., gynecoid versus android) associated with an altered metabolic profile were documented in the medical literature 50 years ago. Given the name syndrome X in 1988, (2) each component of the syndrome has been associated with an increased risk of cardiovascular disease. (3) A report (4) from the National Cholesterol Education Program--Adult Treatment Panel (NCEP--ATP III) identified metabolic syndrome as an independent risk factor for cardiovascular disease and considered it an indication for intensive lifestyle modification.

Definition

The major characteristics of metabolic syndrome include insulin resistance, abdominal obesity, elevated blood pressure, and lipid abnormalities (i.e., elevated levels of triglycerides and low levels of high-density lipoprotein [HDL] cholesterol). Initially defined by an expert panel of the World Health Organization in 1998, (5) the NCEP--ATP III (4) has created an operational definition of metabolic syndrome: the co-occurrence of any three of the abnormalities mentioned above (Table 1 (4,5)).

Metabolic syndrome is associated with a proinflammatory/prothrombotic state that may include elevated levels of C-reactive protein, endothelial dysfunction, hyperfibrinogenemia, increased platelet aggregation, increased levels of plasminogen activator inhibitor 1, elevated uric acid levels, microalbuminuria, and a shift toward small, dense particles of low-density lipoprotein (LDL) cholesterol. Insulin resistance also has been implicated in polycystic ovary syndrome and nonalcoholic steatohepatitis (NASH).

Epidemiology/Prevalence

The prevalence of metabolic syndrome varies by definition used and population studied. (6) Based on data from the Third National Health and Nutrition Examination Survey (1988 to 1994), the prevalence of metabolic syndrome (using the NCEP--ATP III criteria) varies from 16 percent of black men to 37 percent of Hispanic women (Figure 1). (7) The prevalence of metabolic syndrome increases with age and increasing body weight. Because the U.S. population is aging, and because more than one half of adults are overweight or obese, it has been estimated that metabolic syndrome soon will overtake cigarette smoking as the primary risk factor for cardiovascular disease. (8) Metabolic syndrome is an even stronger predictor of risk for type 2 diabetes mellitus. (9)

[FIGURE 1 OMITTED]

Etiology

The etiology of the metabolic syndrome has not been established definitively. One hypothesis presumes that the primary cause is insulin resistance. Insulin resistance correlates with visceral fat measured by waist circumference or waist to hip ratio. The link between insulin resistance and cardiovascular disease probably is mediated by oxidative stress, which produces endothelial cell dysfunction, promoting vascular damage and atheroma formation. (10)

The second hypothesis blames hormonal changes for the development of abdominal obesity. One study (11) demonstrated that persons with elevated levels of serum cortisol (caused by chronic stress) developed abdominal obesity, insulin resistance, and lipid abnormalities. The investigators concluded that this inappropriate activation of the hypothalamic-pituitary-adrenal axis by stress is responsible for the link between psychosocial and economic problems, and acute myocardial infarction.

Clinical Evaluation

The routine medical and family history helps to identify patients at risk for cardiovascular disease or diabetes mellitus. Questions about recent or past weight changes, and a brief diet and physical activity history, (12) including occupational and leisure-time physical activity, are important. The patient should be asked to estimate how many hours a day he or she is sedentary. Questions about typical food intake and efforts to reduce dietary fat or other specific dietary changes allow the physician to estimate the patient's readiness to change lifestyle habits.

The patient's height, weight, and blood pressure should be measured. Body mass index (BMI) should be determined by calculating weight (kg)/height ([m.sup.2]), and waist circumference should be measured at the narrowest point between the umbilicus and the rib cage. Waist circumference appears to be a better predictor of cardiovascular risk than waist-to-hip ratio. (13) Patients suspected of having metabolic syndrome should have a fasting glucose level and a fasting lipid profile level obtained. A euglycemic clamp or homeostasis model assessment is used in research studies to accurately assess insulin resistance, but is impractical for use in the clinical setting. (14)

Fasting insulin levels and glucose challenge tests are indicators of insulin resistance but do not need to be measured in most situations because a fasting glucose level alone suffices for the definition of metabolic syndrome. If LDL cholesterol is normal, measuring levels of apolipoprotein B is not necessary. New tests that measure LDL particle size are expensive and unnecessary, because low HDL cholesterol levels and high triglyceride levels predict small, dense LDL particles.

The American Heart Association recommends measurement of highly sensitive C-reactive protein for risk stratification in patients at high risk of cardiovascular disease. (15) Baseline uric acid levels and routine liver function tests will screen for NASH, but abdominal ultrasonography is required to diagnose fatty liver because it may be present even in the absence of elevated liver function test results.

Treatment Strategies

Currently, no randomized controlled trials specifically examining the treatment of metabolic syndrome have been published. Based on clinical trials, aggressive management of the individual components of the syndrome should make it possible to prevent or delay the onset of diabetes mellitus, hypertension, and cardiovascular disease. (4,16,17) All patients diagnosed with metabolic syndrome should be encouraged to change their diet and exercise habits as primary therapy. Weight loss improves all aspects of the metabolic syndrome, as well as reducing all-cause and cardiovascular mortality (18) (Table 2). While many patients find weight loss difficult to achieve, exercise and dietary changes that can lower blood pressure and improve lipid levels will improve insulin resistance, even in the absence of weight loss. (19)

EXERCISE

Skeletal muscle is the most insulin-sensitive tissue in the body and, therefore, a primary target for impacting insulin resistance. Physical training has been shown to reduce skeletal muscle lipid levels and insulin resistance, regardless of BMI. (20) The impact of exercise on insulin sensitivity is evident for 24 to 48 hours and disappears within three to five days. Thus, regular physical activity should be a part of any effort to reverse the effects of insulin resistance.

EXERCISE PRESCRIPTION

Patients should be encouraged to focus on improving their personal level of physical activity. The greatest health benefits occur when sedentary persons incorporate moderate-intensity exercise into their lifestyle. Low-intensity exercise can have a significant impact on health and studies show that as the recommended frequency of exercise increases, actual participation declines. (21)

The goal for family physicians is to help patients find a level of activity that they can accomplish over the long term. (22) A combination of resistance and aerobic exercise is best, but any activity is better than none, and patients who have been sedentary need to start with walking and gradually increase duration and intensity. (23) Use of low-weight dumbbells, elastic exercise bands, or even heavy food containers can provide the needed weight for resistance training. Walking or light jogging for one hour per day will produce significant losses of abdominal (visceral) fat in men without caloric restriction. (24)

Diet

No single diet is currently recommended for patients with metabolic syndrome; therefore, it may be best for physicians to focus on each patient's specific metabolic alterations when offering dietary advice (25) (Table 2). Sustained dietary changes may require referral to a registered dietitian to help implement suggestions and ensure adequate micronutrient intake (e.g., calcium, iron, folate) while reducing calories. There is debate about what proportions of macronutrients (i.e., protein, fat, and carbohydrates) will produce the best outcome (low-fat, low-carbohydrate, or Mediterranean diets). If a patient is consuming fewer calories than he or she is expending, the macronutrient composition of the diet is probably of secondary importance, because weight loss improves metabolic syndrome.

The primary goals of dietary change for metabolic syndrome are to reduce the risk of cardiovascular disease and diabetes mellitus. Two recent Cochrane Database systematic reviews support the role of dietary interventions in helping to reduce cardiovascular risk. Evidence (26) from one large and one small trial showed that a low-sodium diet helps to maintain lower blood pressure following withdrawal of antihypertensive medications. Results (27) from clinical trials of low-fat diets in which participants were involved for more than two years showed significant reductions in the rate of cardiovascular events and suggested protection from total mortality. The degree of protection from cardiovascular events was statistically significant in patients with a higher risk of cardiovascular disease.

For patients with elevated blood pressure, the Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC 7) (16) states that a systolic blood pressure of 120 to 139 mm Hg or a diastolic pressure of 80 to 89 mm Hg should be considered prehypertensive and trigger lifestyle modifications to prevent cardiovascular disease.

According to the Dietary Approaches to Stop Hypertension (DASH) study, (28) patients who consumed a diet low in saturated fat and high in carbohydrates experienced a significant reduction in blood pressure, even without weight reduction. The DASH diet emphasizes fruits, vegetables, low-fat dairy foods, whole grains, poultry, fish, and nuts, while reducing saturated fats, red meat, sweets, and sugar-containing beverages. Reducing sodium intake can further reduce blood pressure or prevent the increase in blood pressure that may accompany aging.

The Coronary Artery Risk Development in Young Adults study (29) demonstrated that consumption of dairy products was associated with a significantly reduced risk of metabolic syndrome.

Low-fat, high-carbohydrate diets have been criticized because they may raise triglyceride levels and lower HDL-cholesterol levels in some patients, thus aggravating the dyslipidemia of metabolic syndrome. To treat hypertriglyceridemia, or if HDL-cholesterol levels decline on a low-fat diet, carbohydrate intake can be reduced and replaced with foods high in monounsaturated fats (30) or low-glycemic--index carbohydrates. These changes create a diet similar to the Mediterranean-style diet, which also has been shown to reduce mortality from cardiovascular disease. (31)

For sedentary patients with hypertriglyceridemia and insulin resistance (particularly those who are obese or who have an abnormal waist circumference; Table 1 (4,5)), a lower carbohydrate diet that limits sodas, juice drinks, and refined grains (such as sweetened cereals, baked goods, and desserts) may be beneficial (see http://www.ttuhsc.edu/ SOM/FamMed/wholefoods.html).

One study (32) demonstrated a correlation between cardiovascular disease and the intake of refined grain products and potatoes. The investigators recommend a diet high in minimally processed plant-based foods, such as whole grains, fruits, and vegetables. Results of a recent pooled analysis of cohort studies (33) concluded that increasing dietary fiber from fruits, vegetables, and grains lowers the risk of developing cardiovascular disease.

The long-term effects of low-carbohydrate diets have not been studied adequately, but in the short-term, these diets have been shown to lower triglyceride levels, raise HDL-cholesterol levels, and reduce body weight. (34) An alternative to lowering consumption of all carbohydrates is to replace high-glycemic--index foods with less refined lower-glycemic--index foods that contain more fiber. (33) Low-glycemic--index foods produce lower levels of postprandial glucose and insulin. Current fiber intakes are below recommended levels and limiting grains will make this worse.

While alcohol consumption has been associated with elevations of serum triglyceride levels, moderate alcohol intake, defined as one drink per day for women and two drinks per day for men, need not be discouraged unless fatty liver is present, (35) because this level of alcohol intake reduces insulin resistance and cardiovascular disease. (36)

USING EDUCATIONAL STRATEGIES

Family physicians recognize that there are significant barriers to lifestyle counseling, (37) but patient-centered methodologies accompanied by supportive office systems can make the primary care physician more effective. (38,39) Physicians should assess patients' knowledge about the relationship of their lifestyle to their health, then provide a clear message about the importance of diet and exercise for their specific problem.

Next, physicians should try to help patients identify short- and long-term goals and barriers to change. Questions such as: "How do you think that your diet (or exercise level) affects your health?" or "What problems did you encounter in trying to change your diet (or level of activity)?" can help the physician identify effective next steps for each patient. The answers to these questions should be recorded in the medical record and reviewed at subsequent visits to help patients identify and address barriers to lifestyle changes. ICD-9 codes (97802 and 97803) are available for physician reimbursement for these counseling efforts.

PHARMACOTHERAPY

For patients whose risk factors are not reduced adequately by lifestyle changes (Table 3 (1)), pharmacologic interventions to control their blood pressure and lipid levels are indicated. (40) Use of aspirin and statins lowers C-reactive protein levels, but so does weight loss. Aggressive pharmacologic management of risk factors has been shown to be more effective than routine care in preventing cardiovascular disease in patients with type 2 diabetes mellitus. (41)

Prevention

The U.S. Preventive Services Task Force recommends intensive behavioral dietary counseling for adult patients with known risk factors for cardiovascular disease. (42) The evidence for counseling for physical activity is not yet strong enough to merit a recommendation. (43) Family physicians need to be more effective at helping patients adopt healthy lifestyle habits. The Diabetes Prevention Program (19) demonstrated that vigorous lifestyle intervention in patients who are prediabetic could reduce the rate of developing diabetes by more than 50 percent (from 11 to 4.8 percent).

REFERENCES

(1.) Vega GL. Obesity, the metabolic syndrome, and cardiovascular disease. Am Heart J 2001;142:1108-16.

(2.) Reaven GM. Banting lecture 1988. Role of insulin resistance in human disease. Diabetes 1988;37:1595-607.

(3.) Lamarche B, Tchernof A, Mauriege P, Cantin B, Dagenais GR, Lupien PJ, et al. Fasting insulin and apolipoprotein B levels and low-density lipoprotein particle size as risk factors for ischemic heart disease. JAMA 1998;279:1955-61.

(4.) National Institutes of Health: Third Report of the National Cholesterol Education Program Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults (Adult Treatment Panel III). Executive Summary. Bethesda, Md.: National Institutes of Health, National Heart Lung and Blood Institute, 2001 (NIH publication no. 01-3670). Accessed online March 18, 2004, at: http:// www.nhlbi.nih.gov/guidelines/cholesterol/index.htm.

(5.) Alberti KG, Zimmet PZ. Definition, diagnosis and classification of diabetes mellitus and its complications. Part 1: diagnosis and classification of diabetes mellitus, provisional report of a WHO consultation. Diabet Med 1998;15:539-53.

(6.) Ford ES, Giles WH. A comparison of the prevalence of the metabolic syndrome using two proposed definitions. Diabetes Care 2003;26:575-81.

(7.) Ford ES, Giles WH, Dietz WH. Prevalence of the metabolic syndrome among U.S. adults: findings from the Third National Health and Nutrition Examination Survey. JAMA 2002;287:356-9.

(8.) Eckel RH, Krauss RM. American Heart Association call to action: obesity as a major risk factor for coronary heart disease. AHA Nutrition Committee. Circulation 1998;97:2099-100.

(9.) Grundy SM, Brewer HB Jr, Cleeman JI, Smith SC Jr, Lenfant C, for The American Heart Association/ National Heart, Lung, and Blood Institute. Definition of metabolic syndrome: Report of the National Heart, Lung, and Blood Institute/American Heart Association conference on scientific issues related to definition. Circulation 2004; 109:433-8.

(10.) Lopez-Candales A. Metabolic syndrome X: a comprehensive review of the pathophysiology and recommended therapy. J Med 2001;32:283-300.

(11.) Bjorntorp P. Heart and soul: stress and the metabolic syndrome. Scand Cardiovasc J 2001;35:172-7.

(12.) Hark L, Deen D Jr. Taking a nutrition history: a practical approach for family physicians. Am Fam Physician 1999;59:1521-8,1531-2.

(13.) Pouliot MC, Despres JP, Lemieux S, Moorjani S, Bouchard C, Tremblay A, et al. Waist circumference and abdominal sagittal diameter: best simple anthropometric indexes of abdominal visceral adipose tissue accumulation and related cardiovascular risk in men and women. Am J Cardiol 1994;73:460-8.

(14.) Wallace TM, Matthews DR. The assessment of insulin resistance in man. Diabet Med 2002;19:527-34.

(15.) Pearson TA, Mensah GA, Alexander RW, Anderson JL, Cannon RO 3d, Criqui M, et al. Markers of inflammation and cardiovascular disease: application to clinical and public health practice. A statement for healthcare professionals from the Centers for Disease Control and Prevention and the American Heart Association. Circulation 2003;107:499-511.

(16.) Chobanian AV, Bakris GL, Black HR, Cushman WC, Green LA, Izzo JL Jr, et al., for the National Heart, Lung, and Blood Institute Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure; National High Blood Pressure Education Program Coordinating Committee. The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure: the JNC 7 report [Published correction appears in JAMA 2003;290:197]. JAMA 2003;289:2560-72

(17.) Knowler WC, Barrett-Connor E, Fowler SE, Hamman RF, Lachin JM, Walker EA, et al., for the Diabetes Prevention Program Research Group. Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. N Engl J Med 2002;346:393-403.

(18.) Gregg EW, Cauley JA, Stone K, Thompson TJ, Bauer DC, Cummings SR, et al., for the Study of Osteoporotic Fractures Research Group. Relationship of changes in physical activity and mortality among older women. JAMA 2003;289:2379-86.

(19.) Duncan GE, Perri MG, Theriaque DW, Hutson AD, Eckel RH, Stacpoole PW. Exercise training, without weight loss, increases insulin sensitivity and postheparin plasma lipase activity in previously sedentary adults. Diabetes Care 2003;26:557-62.

(20.) Goodpaster BH, He J, Watkins S, Kelley DE. Skeletal muscle lipid content and insulin resistance: evidence for a paradox in endurance-trained athletes. J Clin Endocrinol Metab 2001; 86:5755-61.

(21.) Keller C, Trevino RP. Effects of two frequencies of walking on cardiovascular risk factor reduction in Mexican American women. Res Nurs Health 2001;24:390-401.

(22.) McInnis KJ, Franklin BA, Rippe JM. Counseling for physical activity in overweight and obese patients. Am Fam Physician 2003;67: 1249-56.

(23.) Slentz CA, Duscha BD, Johnson JL, Ketchum K, Aiken LB, Samsa GP, et al. Effects of the amount of exercise on body weight, body composition, and measures of central obesity: STRRIDE--a randomized controlled study. Arch Intern Med 2004;164:31-9.

(24.) Ross R, Dagnone D, Jones PJ, Smith H, Paddags A, Hudson R, et al. Reduction in obesity and related comorbid conditions after diet-induced weight loss or exercise-induced weight loss in men. A randomized, controlled trial. Ann Intern Med 2000;133:92-103.

(25.) Szapary PO, Hark LA, Burke FM. The metabolic syndrome: a new focus for lifestyle modification. Patient Care 2002;36:75-88.

(26.) Hooper L, Bartlett C, Davey SG, Ebrahim S. Advice to reduce dietary salt for prevention of cardiovascular disease. Cochrane Database Syst Rev 2004;(2):CD003656.

(27.) Hooper L, Summerbell CD, Higgins JP, Thompson RL, Clements G, Capps N, et al. Reduced or modified dietary fat for preventing cardiovascular disease. Cochrane Database Syst Rev 2004;(2): CD002137.

(28.) Vollmer WM, Sacks FM, Ard J, Appel LJ, Bray GA, Simons-Morton DG, et al., for the DASH-Sodium Trial Collaborative Research Group. Effects of diet and sodium intake on blood pressure: subgroup analysis of the DASH-sodium trial. Ann Intern Med 2001;135:1019-28.

(29.) Pereira MA, Jacobs DR Jr, Van Horn L, Slattery ML, Kartashov AI, Ludwig DS. Dairy consumption, obesity, and the insulin resistance syndrome in young adults: the CARDIA Study. JAMA 2002; 287:2081-9.

(30.) Grundy SM, Abate N, Chandalia M. Diet composition and the metabolic syndrome: what is the optimal fat intake? Am J Med 2002;113(suppl 9B):25S-29S.

(31.) Trichopoulou A, Costacou T, Bamia C, Trichopoulos D. Adherence to a Mediterranean diet and survival in a Greek population. N Engl J Med 2003;348:2599-608.

(32.) Liu S, Manson JE. Dietary carbohydrates, physical inactivity, obesity, and the 'metabolic syndrome' as predictors of coronary heart disease. Curr Opin Lipidol 2001;12:395-404.

(33.) Jenkins DJ, Kendall CW, Augustin LS, Vuksan V. High-complex carbohydrate or lente carbohydrate foods? Am J Med 2002;113 (suppl 9B):30S-37S.

(34.) Foster GD, Wyatt HR, Hill JO, McGuckin BG, Brill C, Mohammed BS, et al. A randomized trial of a low-carbohydrate diet for obesity. N Engl J Med 2003;348:2082-90.

(35.) Goude D, Fagerberg B, Hulthe J, for the AIR study group. Alcohol consumption, the metabolic syndrome and insulin resistance in 58-year-old clinically healthy men (AIR study). Clin Sci (London) 2002;102:345-52.

(36.) Bell DS. Understanding the role of insulin resistance for the treatment of diabetes and the reduction of cardiovascular risks. J Gender-Specific Med 2002;5(suppl):1S-14S.

(37.) Petrella RJ, Wight D. An office-based instrument for exercise counseling and prescription in primary care. The Step Test Exercise Prescription (STEP). Arch Fam Med 2000;9:339-44.

(38.) Wallace LS, Rogers ES, Bielak K. Promoting physical activity in the family practice setting. Am Fam Physician 2003;67:1199-200,1202.

(39.) Ockene IS, Hebert JR, Ockene JK, Merriam PA, Hurley TG, Saperia GM. Effect of training and a structured office practice on physician-delivered nutrition counseling: the Worcester-Area Trial for Counseling in Hyperlipidemia (WATCH). Am J Prev Med 1996; 12:252-8.

(40.) Ginsberg HN. Treatment for patients with the metabolic syndrome. Am J Cardiol 2003;91(7A):29E-39E.

(41.) Gaede P, Vedel P, Larsen N, Jensen GV, Parving HH, Pedersen O. Multifactorial intervention and cardiovascular disease in patients with type 2 diabetes. N Engl J Med 2003;348:383-93.

(42.) U.S. Preventive Services Task Force. Behavioral counseling in primary care to promote a healthy diet: recommendations and rationale. Am J Prev Med 2003;24:93-100.

(43.) U.S. Preventive Services Task Force. Behavioral counseling in primary care to promote physical activity: recommendations and rationale. Accessed online April 30, 2004, at: http://www.ahrq. gov/clinic/3rduspstf/physactivity/physactrr.htm.

The Author

DARWIN DEEN, M.D., M.S., is director of medical student education in the Department of Family and Social Medicine at the Albert Einstein College of Medicine of Yeshiva University, Bronx, N.Y. He graduated from the Albert Einstein College of Medicine and completed a residency in family medicine at Montefiore Medical Center, Bronx. Dr. Deen received his masters degree in human nutrition from Columbia University College of Physicians and Surgeons, New York City. He was co-principle investigator of a recent Nutrition Academic Award grant from the National Institutes of Health.

Address correspondence to Darwin Deen, M.D., M.S., Department of Family and Social Medicine, Albert Einstein College of Medicine, 1300 Morris Park Ave., Mazur Bldg. Suite 100, Bronx, NY 10461 (e-mail: deen@aecom.yu.edu). Reprints are not available from the author.

The author indicates no conflicts of interest. Sources of funding: Nutrition Academic Award NIH 5 K07 HL0395.

The author wishes to thank Gina Lopez for her assistance with the literature review, Drs. Peter Selwyn and Janet Townsend for their review of the manuscript, and Dr. Lisa Hark for her invaluable assistance with the manuscript and the patient education handout.

COPYRIGHT 2004 American Academy of Family Physicians
COPYRIGHT 2004 Gale Group

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