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Fleming RM. Mitochondrial Uptake of Sestamibi Distinguishes Between Normal, Inflammatory Breast Changes, Pre-Cancers, and Infiltrating Breast Cancer. Integr Cancer Ther 2016; 1:229-37. [PMID: 14667281 DOI: 10.1177/153473540200100302] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The evaluation of breast tissue using nuclear imaging is dependent upon the delivery and uptake of the isotope by breast tissue. This is dependent upon blood flow to the breast and functioning mitochondria. This 2-part study investigated (1) differences in uptake of sestamibi when blood flow is enhanced (breast enhanced scintigraphy test [BEST]), and (2) differences in isotope uptake in normal (Nl) breast tissue, inflammatory changes in breast tissue (ICB), and breast cancer (CA). In the first part of the study, 10 women were compared using both Miraluma and BEST imaging; in the second part, 195 people were studied using BEST imaging only. The results were compared with histopathologic specimens. Little difference was noted between Miraluma and BEST imaging in the first part. Women with ICB showed a statistically significant ( P< .05) increase in isotope uptake using BEST imaging. This difference was even more significant ( P< .005) in women with CA. During the second part of the study, BEST imaging demonstrated an exponential increase in tracer uptake. When maximal count activity was compared, there was a statistically significant ( P<.001) difference between Nl and ICB, between ICB and atypia (A), and between A and CA. BEST imaging demonstrated significant increases in isotope delivery when compared with Miraluma imaging. These differences allowed differentiation of breast tissue, including the detection of early changes in breast tissue.
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Fleming RM, Harrington GM. What is the relationship between myocardial perfusion imaging and coronary artery disease risk factors and markers of inflammation? Angiology 2008; 59:16-25. [PMID: 18319218 DOI: 10.1177/0003319707303887] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The treatment of coronary artery disease (CAD) is clinically measured by monitoring changes in venous lipids and inflammatory markers. There is currently no established quantified relationship between coronary flow reserve and markers of inflammatory CAD. A total of 120 men and women underwent quantified measurement of coronary blood flow using SPECT imaging at baseline and 1 year later. They had fasting venous blood work obtained at baseline and 1 year later. These markers of lipids and inflammation included, total cholesterol, low-density lipoprotein cholesterol, very low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, triglycerides, lipoprotein-a, homocysteine, fibrinogen, C-reactive protein, and interleukin-6. Regression analysis reveals no general statistical relationship between these markers and coronary blood flow as measured by myocardial perfusion imaging. However, when changes in indices are considered and changes in risk factors are compared with changes in ischemia, blood factor based estimates yield an adjusted R2 = 0.31, R = 0.57, P < .0001. Initial levels of coronary ischemia cannot be diagnostically inferred from baseline values in lipid and inflammatory markers of coronary artery disease. When change in coronary blood flow is quantified using SPECT imaging, 6 independent underlying blood factors provided statistically useful information in identifying changes in coronary blood flow. Although the relationship of changes is statistically significant ( P < .0001), quantification of coronary blood flow by SPECT imaging provides physiologic status information, which cannot be inferred from fasting markers of lipids and inflammation status.
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Affiliation(s)
- Richard M Fleming
- Critical Care and Cardiology, Department of Internal Medicine, Sierra Nevada Veterans Affairs Health Care System, Reno, Nevada 89502-2597, USA. rmfmd7@ hotmail.com
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Abstract
The increased incidence of obesity in the world has resulted in more and more people attempting to lose weight through a variety of diets. Many of these diets employ caloric reduction through the elimination of certain food groups. These diets may initially be associated with weight loss (including water weight) but follow up reports of these diets show high drop out rates, proinflammatory changes which can precipitate heart disease and weight gain following cessation of these diets. Efforts to use prescription anorexic medications have been associated with valvular disease and other health concerns. Dissatisfaction with the medical community and a subsequent increase in the availability of information on the Internet, are only two of the reasons why people are looking at alternative medicine to assist with health care issues. This includes the use of herbal supplements for appetite suppression. A review of the literature reveals several problems with some of these supplements, including Ephedra. Potentially serious adverse effects include dysrhythmias, heart failure, myocardial infarction, changes in blood pressure, and death have occurred. Unfortunately, one half of all patients experiencing a myocardial infarction have total cholesterol levels below 150 mg/dL and/or no prior cardiac symptoms. This means that the development of inflammatory changes which can precipitate myocardial infarction may go unnoticed by conventional testing and unless markers of inflammation and coronary perfusion are looked for, changes which can precipitate myocardial infarction may go unnoticed until cardiac injury occurs. The following case presentation shows how an individual with exertional dyspnea and concerned about her weight was affected by both the ingestion of a low-carbohydrate diet and ephedra.
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Affiliation(s)
- R M Fleming
- Critical Care & Cardiology Division, Sierra Nevada Veterans Affairs Health Care System, Reno, NV 89502-2597, USA.
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Fleming RM. High-dose dipyridamole and gated sestamibi SPECT imaging provide diagnostic resting and stress ejection fractions useful for predicting extent of coronary artery disease. Angiology 2002; 53:415-21. [PMID: 12143946 DOI: 10.1177/000331970205300407] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A decline in ejection fraction at stress compared with rest images has been associated with increased severity of coronary artery disease (CAD) and suggests a poorer prognosis. Myocardial perfusion imaging (MPI) using high-dose dipyridamole (HDD) has been shown to more accurately detect CAD than either standard dose dipyridamole (SDD) or exercise-induced stress (EST), but has not been looked at to determine its usefulness in detecting changes in stress and rest ejection fractions. To determine the relationship between changes in left ventricular ejection fraction (LVEF) and the severity of CAD, 36 Individuals underwent gated single photon emission computed tomography (SPECT) MPI using HDD. In each case resting and stress LVEFs were determined along with MPI results. Subjects with single-vessel CAD demonstrated an increase in LVEF from 77.8% (sd +/-8.8%) to 85.6% (sd +/-8.4%) resulting in a statistically significant increase in LVEF of 7.8% (p = 0.009). Patients with two-vessel disease showed a smaller increase from 73.2% (sd + 8.3%) to 79.8% (sd + 9.8%) following HDD stress. This increase was statistically (p = 0.008) significant. Patients with triple-vessel CAD showed a reduction in LVEF from 67.4% (sd +/-14.07) to 65.1% (sd +/-16.5%) which represented a decrease in LVEF of 2.7% and approached (p = 0.25) but did not reach statistical significance. Both the resting and stress LVEFs were statistically lower (p<0.05) in patients with triple-vessel CAD. Changes in resting LVEF (REF) and HDD pharmacologically induced stress LVEF (SEF) provide a valuable diagnostic marker as to the number of significantly diseased coronary arteries and can be acquired from gated SPECT sestamibi images.
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Fleming RM. A tête-à-tête comparison of ejection fraction and regional wall motion abnormalities as measured by echocardiography and gated sestamibi SPECT. Angiology 2002; 53:313-21. [PMID: 12025919 DOI: 10.1177/000331970205300309] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Determination of ejection fraction and regional wall motion abnormalities (RWMAs) consistent with stunned, hibernating, or infarcted myocardium can be noninvasively determined by both echocardiography and nuclear cardiac imaging. Prior comparisons between the 2 methods have been limited to Tc 99m pertechnetate or to stress images with attention to RWMAs only. To determine the relationship between results seen with echocardiography and gated single photon emission computed tomography (SPECT) using sestamibi, 26 individuals with varying degrees of coronary artery disease were prospectively studied with both techniques. Five individuals had single-vessel disease, 10 had 2-vessel disease, and 11 had triple-vessel disease. Each individual underwent 2-D, M-mode, and Doppler echocardiography (echo) as well as gated SPECT imaging using rest and stress (high-dose dipyridamole/HDD) sestamibi imaging. The results were statistically different when ejection fractions (EFs) and RWMAs were compared. There were no statistical differences between EFs determined at rest when either echo or nuclear imaging was used. However, patients with EFs <70-80% were overestimated by echo, with echo underestimating EFs >70-80% (p=0.001). There was a high correlation (r=0.76) between resting echocardiographic EFs and SPECT resting gated sestamibi images in patients with single-vessel disease, and a moderate correlation (r=0.68 and r=0.68) in patients with 2- and 3-vessel disease, respectively. Differences in the detection of RWMAs were statistically different for patients with 2-vessel disease (p=0.04) and approached significance in 3-vessel disease (p=0.56) with more RWMA being detected by resting gated SPECT imaging than by echo. Greater differences in RWMAs were seen in patients with 1-, 2-, and 3-vessel disease when resting echo was compared with HDD gated SPECT sestamibi imaging. These differences were statistically greater in 2- (p=0.0027) and 3- (p=0.0003) vessel disease. Differences between stress and resting images are expected in individuals with severe coronary artery disease. Comparison of noninvasive assessment of EFs and RWMAs by gated SPECT sestamibi and echocardiography showed different results when looking at EFs, with echo reporting greater EFs for people with EFs <70-80%. Patients with two and 3-vessel disease were statistically more likely to have RWMAs detected by gated SPECT sestamibi than by echo.
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Affiliation(s)
- Richard M Fleming
- The Fleming Heart and Health Institute and the Camelot Foundation, Omaha, NE 68114, USA.
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Wright DJ, Williams SG, Lindsay HS, Sheard KL, Thorley PJ, Sivananthan UM. Assessment of adenosine, arbutamine and dobutamine as pharmacological stress agents during (99m)Tc-tetrofosmin SPECT imaging: a randomized study. Nucl Med Commun 2001; 22:1305-11. [PMID: 11711900 DOI: 10.1097/00006231-200112000-00005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We evaluated the use of adenosine, dobutamine and arbutamine with (99m)Tc-tetrofosmin myocardial perfusion imaging. Forty patients under investigation for suspected coronary artery disease were recruited. Each had a resting scan and two separate stress scans on different days, in a randomized cross-over study. Resultant images were blindly reported in 13 segments per scan as normal, reversible or fixed defects. A score was given (0-3) for segmental defect severity. Haemodynamic responses were as expected for each agent. Subjective side effect scores did not differ overall between agents. Adenosine caused a significantly higher incidence of abnormal taste (54%) than dobutamine and arbutamine (both 23%) and a lower incidence of palpitations (25% vs 69% and 54%, respectively), all P<0.05. Arbutamine caused significantly more chest pain than adenosine (77% vs 46%) though less flushing (35% vs 68%), both P<0.05. Comparison of the results obtained showed highly significant levels of segmental agreement for visual and semi-quantitative analysis between adenosine and arbutamine, kappa value and correlation coefficient of 0.78 and 0.86, respectively, dobutamine and adenosine 0.69 and 0.78, and arbutamine and dobutamine 0.75 and 0.78, all P<0.0001. Adenosine, arbutamine and dobutamine differ in their haemodynamic response and side effect profile but provide highly comparable results during (99m)Tc SPECT imaging.
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Affiliation(s)
- D J Wright
- The Cardiothoracic Centre, Thomas Drive, Liverpool, L14 3PE, UK.
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Abstract
Recent research has demonstrated that successful simultaneous treatment of multiple risk factors including cholesterol, triglycerides, homocysteine, lipoprotein (a) [Lp(a)], fibrinogen, antioxidants, endothelial dysfunction, inflammation, infection, and dietary factors can lead to the regression of coronary artery disease and the recovery of viable myocardium. However, preliminary work revealed that a number of individuals enrolled in the original study went on popular high-protein diets in an effort to lose weight. Despite increasing numbers of individuals following high-protein diets, little or no information is currently available regarding the effect of these diets on coronary artery disease and coronary blood flow. Twenty-six people were studied for 1 year by using myocardial perfusion imaging (MPI), echocardiography (ECHO), and serial blood work to evaluate the extent of changes in regional coronary blood flow, regional wall motion abnormalities, and several independent variables known to be important in the development and progression of coronary artery disease. Treatment was based on homocysteine, Lp (a), C-reactive protein (C-RP), triglycerides, total cholesterol, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, very low-density lipoprotein cholesterol, and fibrinogen levels. Each variable was independently treated as previously reported. MPI and ECHO were performed at the beginning and end of the study for each individual. The 16 people (treatment group/TG) studied modified their dietary intake as instructed. Ten additional individuals elected a different dietary regimen consisting of a "high-protein" (high protein group/HPG) diet, which they believed would "improve" their overall health. Patients in the TG demonstrated a reduction in each of the independent variables studied with regression in both the extent and severity of coronary artery disease (CAD) as quantitatively measured by MPI. Recovery of viable myocardium was seen in 43.75% of myocardial segments in these patients, documented with both MPI and ECHO evaluations. Individuals in the HPG showed worsening of their independent variables. Most notably, fibrinogen, Lp (a), and C-RP increased by an average of 14%, 106%, and 61% respectively. Progression of the extent and severity of CAD was documented in each of the vascular territories with an overall cumulative progression of 39.7%. The differences between progression and extension of disease in the HPG and the regression of disease in the TG were statistically (p<0.001) significant. Patients following recommended treatment for each of the independent variables were able to regress both the extent and severity of their coronary artery disease (CAD), as well as improve their myocardial wall motion (function) while following the prescribed medical and dietary guidelines. However, individuals receiving the same medical treatment but following a high-protein diet showed a worsening of independent risk factors, in addition to progression of CAD. These results would suggest that high-protein diets may precipitate progression of CAI) through increases in lipid deposition and inflammatory and coagulation pathways.
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Affiliation(s)
- R M Fleming
- The Fleming Heart and Health Institute and the Camelot Foundation, Omaha, Nebraska 68114, USA.
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Comparing a High-dose Dipyridamole SPECT Imaging Protocol with Dobutamine and Exercise Stress Testing Protocols. Part III: Using Dobutamine to Determine Lung-to-Heart Ratios, Left Ventricular Dysfunction, and a Potential Viability Marker. Int J Angiol 1999; 8:22-26. [PMID: 9826402 DOI: 10.1007/bf01616837] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Determination of the severity of coronary artery disease (CAD) by single photon emission computed tomography (SPECT) imaging has previously been shown to have greater sensitivity, specificity, and accuracy when performed with pharmacologic stress using dobutamine than by standard dose dipyridamole (SDD) or exercise stress testing (EST) prior to SPECT imaging. The use of lung to heart (L:H) ratios has been shown to be valuable in determining the presence or absence of left main (LM) or triple vessel (3V) CAD. No such work has been previously reported for dobutamine. Twenty-one patients were studied using dobutamine (n = 7) or EST (n = 14). These results were compared with results from Part II of this series of studies using high-dose dipyridamole (HDD) pharmacologic stress. In this study, patients underwent L:H ratio analysis following injection of 3 mCi of Tl-201, this provides sufficient time for thallium clearance from the blood pool. Results of the L:H ratios were compared with the results of coronary arteriographic (CA) evaluation. Patients who were "stressed" via EST demonstrated statistically greater (p </= 0.001) L:H ratios in patients with LM/3V CAD when compared with patients who had 0-2 significantly stenosed coronary arteries. Patients stressed with dobutamine demonstrated lower L:H ratios (p = NS) in patients with LM/3V CAD than was seen for patients with 0-2 V CAD. Patients stressed with dobutamine had statistically (p </= 0.05) lower L:H ratios than did similar patients stressed with EST. Increased L:H ratios following EST and HDD, as shown previously in Part II of this series, provide excellent markers for LM/3V CAD following Tl-201 injection. The presence of "normal" L:H ratios in patients with LM/3V CAD following dobutamine stress may suggest the presence of "stunned" or "hibernating" myocardium. The presence of "decreased" L:H ratios following dobutamine after HDD or EST has already shown an increased L:H ratio, might suggest a marker for myocardial viability that deserves further investigation.
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Quantification of Viable Myocardium in Multivessel Coronary Disease: Effects of the Redistribution Time after Reinjection Of Thallium-201 and Comparison with Postrevascularization Defect Size. Int J Angiol 1999; 8:36-39. [PMID: 9826406 DOI: 10.1007/bf01616841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Reinjection of 201Tl is used for improved detection of viable myocardium. Prospectively the effect of the redistribution time after injection for the quantification of the definitive perfusion defect size in multivessel coronary heart disease and severely impaired left ventricular function was examined. Thirty patients were included preoperatively before CABG. The study was performed with 80-90 MBq 201Tl-Cl and reinjection (40-50 MBq). Imaging was performed after an exercise test and 3 hours afterwards. Thereafter, the reinjection dose was given and repeated studies were performed 10 minutes, 2 hours, and 20 hours later. Defect sizes were compared with the 3-hour rest-study without reinjection. Imaging studies were repeated postoperatively. The defect size was expressed as % of left ventricular total myocardium. Perfusion defect sizes were as follows: post-stress study (27%), 3 hour rest-study (17%), post-reinjection-10 min (12%), 2 hours (9%), and 20 hours (7%). Compared with the 3 hour rest-study, the perfusion defect was reduced only in 7/30 patients in the study immediately after reinjection. In the delayed studies, defect sizes were markedly smaller (p < 0.05) both in studies 2 hours and 20 hours after reinjection. In 15/30 patients there was a marked reduction of 50% of defect sizes in the study 2 hours post-reinjection vs the 3 hour rest-study. The residual defects at 2 hours after reinjection were identical to the postoperative defect sizes (10%). Further prolongation of the redistribution time to 20 horus caused an additional small reduction in defect size only in two patients compared with the 2-hour post-reinjection images (n.s.). Using a marker as 201Tl with redistribution characteristics, the redistribution time after reinjection is of utmost importance to correctly identify the definitive size of the perfusion defect vs viable myocardium in patients with multivessel disease. A delay of 2 hours for redistribution after the reinjection most correctly corresponds to the postop defect size; a longer redistribution time did not provide additional advantages.
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Comparing a High-Dose Dipyridamole SPECT Imaging Protocol with Dobutamine and Exercise Stress Testing Protocols. Part II: Using High-Dose Dipyridamole to Determine Lung-to-Heart Ratios. Int J Angiol 1998; 7:325-8. [PMID: 9716797 DOI: 10.1007/bf01623874] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Determination of the severity of coronary artery disease (CAD) by single photon emission computed tomography (SPECT) imaging has previously been shown to have greater sensitivity, specificity, and accuracy when performed with pharmacologic stress using high-dose dipyridamole (HDD), than by standard dose dipyridamole (SDD) or exercise stress (EST) prior to SPECT imaging. The use of lung-to-heart (L:H) ratios has been shown to be valuable in determining the presence or absence of left main (LM) or triple vessel (3V) CAD. Fifty-four patients were studied; HDD (n = 40) or EST (n = 14) was used for the study. These patients underwent L:H ratio analysis, in which anterior views were used 5-10 minutes after the injection of 3 mCi of T1-201. Results of the L:H ratios were compared with the diagnosis of epicardial CAD, as determined by coronary (CA) arteriography. Patients who were "stressed" using either HDD or EST demonstrated statistically greater (p < 0.001) L:H ratios if they had LM/3V CAD when compared with patients who had 0-2 significantly stenosed coronary arteries. Though L:H ratios were greater when HDD pharmacologic stress was used, there was no statistical (p = NS) differences between the two groups. Increased L:H ratios with HDD and EST provide excellent markers for LM/3V CAD using T1-201 imaging. Coupled with previously reported SPECT data, the use of HDD shows promise for increasing the diagnostic accuracy of SPECT imaging.
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Fleming RM, Ketchum K, Fleming DM, Gaede R. Assessing the independent effect of dietary counseling and hypolipidemic medications on serum lipids. Angiology 1996; 47:831-40. [PMID: 8810649 DOI: 10.1177/000331979604700901] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Determination of changes in total cholesterol (TC) and triglyceride (TG) levels has focused primarily on hypolipidemic drug effects. Changes resulting from dietary effect alone versus diet and drug effect have not yet been fully established. Seventy subjects were enrolled into four treatment groups to determine the impact of diet and drug effect upon TC and TG. Group 1 (n = 28) served as the control group and received no dietary counseling or drug therapy. Group 2 (n = 22) received dietary counseling. Group 3 (n = 7) underwent dietary counseling for six months and drug therapy for eighteen months. Subjects in groups 1-3 were monitored for eighteen months. Patients in group 4 (n = 13) were followed up for thirty-six months. No intervention occurred during the first eighteen months, and hypolipidemic medications were used during the second eighteen-month period. Subjects in groups 1 and 4 received no specific dietary counseling and demonstrated no significant improvement over the course of the study. Patients in groups 2 and 3 showed significant reductions in both TC and TG. The improvement in TC seen for patients in group 3 was reduced after dietary counseling ceased. Dietary intervention is necessary if patients are to statistically significantly reduce TC and TG levels. Drug therapy demonstrated the expected reductions in both TC and TG but did not statistically significantly lower lipid levels without concomitant dietary counseling. When dietary counseling and hypolipidemic medications are used together, reductions in TC and TG values are even greater than those seen with dietary effect alone. Diet control alone appears to significantly reduce TC and TG levels, resulting in reduced need for antianginal medications.
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Affiliation(s)
- R M Fleming
- Center for Clinical Cardiology and Research, Sartori Memorial Hospital, Cedar Falls, Iowa, USA
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Abstract
BACKGROUND Determination of the effects of dietary modification and hyperlipidemic medications in the elderly (> sixty-five years of age) patient has not been significantly investigated to date despite knowledge that elevated cholesterol (TC) and triglyceride (TG) levels increase the risk of coronary artery disease (CAD). METHODS Twenty-seven individuals were placed into one of three treatment groups and longitudinally followed up to examine the effects of diet and hyperlipidemic medications on TC and TG levels. Group 1 (n = 14) received neither dietary nor drug therapy. Group 2 (n = 9) received dietary counseling without concomitant hyperlipidemic medications. Subjects in group 3 (n = 4) underwent dietary instruction for six months and hyperlipidemic medication(s) for eighteen months. RESULTS Subjects in group 1 demonstrated a statistical increase in TC (P < or = 0.001) during the study. Patients in groups 2 (P < or = 0.001) and 3 (P < or = 0.05) demonstrated statistical improvement in TC reduction during dietary counseling. The effect on TC was blunted in group 3 after dietary counseling was discontinued. Reductions in TG levels were significant (P < or = 0.001) only for patients in group 2. CONCLUSION Elderly individuals were able to significantly reduce both TC and TG levels by dietary modification alone. Minimal improvement was seen with the addition of hyperlipidemic medications.
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Affiliation(s)
- R M Fleming
- Center for Clinical Cardiology and Research, North Bellevue, NE 68005, USA
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