76
|
Patel AR, Kuvin JT, Sliney KA, Rand WM, Chiang JC, Udelson JE, Pandian NG, Karas RH. Gender-based differences in brachial artery flow-mediated vasodilation as an indicator of significant coronary artery disease. Am J Cardiol 2005; 96:1223-6. [PMID: 16253586 DOI: 10.1016/j.amjcard.2005.06.060] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2005] [Revised: 06/14/2005] [Accepted: 06/14/2005] [Indexed: 11/24/2022]
Abstract
Ultrasound of the brachial artery is widely used to assess endothelial function, but whether brachial artery flow-mediated vasodilation (FMD) differs between women and men who have coronary artery disease (CAD) has not been examined. To investigate gender-based differences in brachial artery FMD as an indicator of significant CAD, FMD was measured in women and men outpatients who had CAD (coronary stenosis >50%, n = 64) and those who did not have significant CAD (n = 145). FMD in women who had CAD (n = 33, 9.1 +/- 0.8%) was higher than that in similarly aged men who had CAD (n = 31, 6.4 +/- 0.5%; p = 0.008). The FMD cutpoint that maximized sensitivity with least effect on specificity for screening CAD was 15% (91% sensitivity, 25% specificity) in women but 10% (90% sensitivity, 43% specificity) in men. If the cutpoint as defined in men were used to evaluate women, brachial artery ultrasound would fail to diagnose 42% of women who do not have significant CAD; thus, a higher FMD cutpoint is required to optimize the sensitivity of FMD for identifying women who have significant CAD compared with similarly aged men. In studies using FMD to evaluate cardiovascular risk, different standards should be applied for women and men.
Collapse
|
77
|
Kuvin JT, Sidhu M, Patel AR, Sliney KA, Pandian NG, Karas RH. Pulse pressure and peripheral arterial vasoreactivity. J Hum Hypertens 2005; 19:501-2. [PMID: 15729377 DOI: 10.1038/sj.jhh.1001844] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
78
|
Mieres JH, Shaw LJ, Arai A, Budoff MJ, Flamm SD, Hundley WG, Marwick TH, Mosca L, Patel AR, Quinones MA, Redberg RF, Taubert KA, Taylor AJ, Thomas GS, Wenger NK. Role of noninvasive testing in the clinical evaluation of women with suspected coronary artery disease: Consensus statement from the Cardiac Imaging Committee, Council on Clinical Cardiology, and the Cardiovascular Imaging and Intervention Committee, Council on Cardiovascular Radiology and Intervention, American Heart Association. Circulation 2005; 111:682-96. [PMID: 15687114 DOI: 10.1161/01.cir.0000155233.67287.60] [Citation(s) in RCA: 356] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Cardiovascular disease is the leading cause of mortality for women in the United States. Coronary heart disease, which includes coronary atherosclerotic disease, myocardial infarction, acute coronary syndromes, and angina, is the largest subset of this mortality, with >240,000 women dying annually from the disease. Atherosclerotic coronary artery disease (CAD) is the focus of this consensus statement. Research continues to report underrecognition and underdiagnosis of CAD as contributory to high mortality rates in women. Timely and accurate diagnosis can significantly reduce CAD mortality for women; indeed, once the diagnosis is made, it does appear that current treatments are equally effective at reducing risk in both women and men. As such, noninvasive diagnostic and prognostic testing offers the potential to identify women at increased CAD risk as the basis for instituting preventive and therapeutic interventions. Nevertheless, the recent evidence-based practice program report from the Agency for Healthcare Research and Quality noted the paucity of women enrolled in diagnostic research studies. Consequently, much of the evidence supporting contemporary recommendations for noninvasive diagnostic studies in women is extrapolated from studies conducted predominantly in cohorts of middle-aged men. The majority of diagnostic and prognostic evidence in cardiac imaging in women and men has been derived from observational registries and referral populations that are affected by selection and other biases. Thus, a better understanding of the potential impact of sex differences on noninvasive cardiac testing in women may greatly improve clinical decision making. This consensus statement provides a synopsis of available evidence on the role of the exercise ECG and cardiac imaging modalities, both those in common use as well as developing technologies that may add clinical value to the diagnosis and risk assessment of the symptomatic and asymptomatic woman with suspected CAD.
Collapse
|
79
|
Kuvin JT, Patel AR, Sliney KA, Pandian NG, Karas RH. Comparison of flow-mediated dilatation of the brachial artery in coronary patients with low-density lipoprotein cholesterol levels <80 mg/dl versus patients with levels 80 to 100 mg/dl. Am J Cardiol 2005; 95:93-5. [PMID: 15619399 DOI: 10.1016/j.amjcard.2004.08.067] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2004] [Revised: 08/19/2004] [Accepted: 08/19/2004] [Indexed: 10/26/2022]
Abstract
Testing of peripheral vascular endothelial function was performed in subjects who had coronary artery disease and a low-density lipoprotein (LDL) cholesterol level <100 mg/dl. LDL cholesterol was an independent predictor of flow-mediated dilation of the brachial artery (p = 0.010). The 63 subjects who had an LDL cholesterol level <80 mg/dl had better endothelial function (flow-mediated dilation 8.4 +/- 3.8%) than did 47 subjects whose level of LDL cholesterol was 80 to 100 mg/dl (flow-mediated dilation 6.8 +/- 4.0%, p = 0.03). The beneficial effects of LDL cholesterol levels <80 mg/dl on endothelial function were more apparent in subjects who had low levels of high-density lipoprotein cholesterol than in those who had normal levels. These data support recent reports that decreasing levels of LDL cholesterol below those currently recommended provides additional benefits and suggest that this benefit may be due in part to increased endothelial function.
Collapse
|
80
|
Mohan JC, Mukherjee S, Kumar A, Arora R, Patel AR, Pandian NG. Does chronic mitral regurgitation influence Doppler pressure half-time-derived calculation of the mitral valve area in patients with mitral stenosis? Am Heart J 2004; 148:703-9. [PMID: 15459604 DOI: 10.1016/j.ahj.2003.12.043] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND In patients with mitral stenosis (MS), Doppler pressure half-time (PHT) may be influenced by hemodynamic variables other than the anatomic mitral valve orifice narrowing. This study was undertaken to assess whether the presence of concomitant mitral regurgitation (MR) affects mitral valve area (MVA) estimation by PHT. METHODS Consecutive patients (n = 166) with noncalcific MS, in sinus rhythm, were studied. Group 1 (n = 106) had no or mild MR, and group 2 (n = 60) had moderate or severe MR. MVA was assessed by using the PHT method and planimetry. RESULTS There was a strong correlation between planimetry and PHT MVA in both groups (group 1: r = 0.86, P <.001; group 2: r = 0.73, P <.001). However, compared with planimetry MVA, PHT underestimated MVA by > or =20% in 18 patients (17%) in group 1 and 21 patients (35%) in group 2 (P <.01). Overestimation by > or =20% occurred in 12 patients (11%) in group 1 and in 7 (12%) in group 2. Group 2 subanalysis (group 2A: moderate MR, n = 16; group 2B: severe MR, n = 44) revealed that linear regression weakened with increasing severity of MR (group 2A: r = 0.824, P <.001, group 2B: r = 0.70, P <.001). PHT underestimation of MVA occurred in 31% and 36% of patients in Groups IIA and IIB, respectively (P = NS). CONCLUSIONS PHT appears to be reliable for estimating MVA in most patients with MS, even in the presence of MR. However, the presence of significant MR reduces the reliability of PHT-derived MVA, with underestimation of MVA in a significant number of subjects. The severity of MR has a direct impact on PHT-derived MVA.
Collapse
|
81
|
Kimmelstiel C, Levine D, Perry K, Patel AR, Sadaniantz A, Gorham N, Cunnie M, Duggan L, Cotter L, Shea-Albright P, Poppas A, LaBresh K, Forman D, Brill D, Rand W, Gregory D, Udelson JE, Lorell B, Konstam V, Furlong K, Konstam MA. Randomized, Controlled Evaluation of Short- and Long-Term Benefits of Heart Failure Disease Management Within a Diverse Provider Network. Circulation 2004; 110:1450-5. [PMID: 15313938 DOI: 10.1161/01.cir.0000141562.22216.00] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background—
Several trials support the usefulness of disease management (DM) for improving clinical outcomes in heart failure (HF). Most of these studies are limited by small sample size; absence of concurrent, randomized controls; limited follow-up; restriction to urban academic centers; and low baseline use of effective medications.
Methods and Results—
We performed a prospective, randomized assessment of the effectiveness of HF DM delivered for 90 days across a diverse provider network in a heterogeneous population of 200 patients with high baseline use of approved HF pharmacotherapy. During a 90-day follow-up, patients randomized to DM experienced fewer hospitalizations for HF [primary end point, 0.55±0.15 per patient-year alive versus 1.14±0.22 per patient-year alive in control subjects; relative risk (RR), 0.48,
P
=0.027]. Intervention patients experienced reductions in hospital days related to a primary diagnosis of HF (4.3±0.4 versus 7.8±0.6 days hospitalized per patient-year; RR, 0.54;
P
<0.001), cardiovascular hospitalizations (0.81±0.19 versus 1.43±0.24 per patient-year alive; RR, 0.57;
P
=0.043), and days in hospital per patient-year alive for cardiovascular cause (RR, 0.64;
P
<0.001). Intervention patients showed a trend toward reduced all-cause hospitalizations and total hospital days. On long-term (mean, 283 days) follow-up, there was substantial attrition of the 3-month gain in outcomes, with sustained significant reduction only in days in hospital for cardiac cause.
Conclusions—
In a population with high background use of standard HF therapy, a DM intervention, uniformly delivered across varied clinical sites, produced significant short-term improvement in HF-related clinical outcomes. Longer-term benefit likely requires more active chronic intervention, even among patients who appear clinically stable.
Collapse
|
82
|
Krishnamani R, Khabbaz KR, Li W, Patten RD, Konstam MA, Patel AR, Udelson JE, DeNofrio D. Does left ventricular assist device implantation volume affect post-cardiac transplant outcome? an analysis of the united network for organ sharing (UNOS) thoracic registry. J Card Fail 2004. [DOI: 10.1016/j.cardfail.2004.06.186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
83
|
Krishnamani R, Khabbaz KR, Li W, Patten RD, Konstam MA, Patel AR, Udelson JE, DeNofrio D. Effect of transplant center experience on post-transplant mortality for patients supported with an implantable left ventricular assist device: an analysis of the united network for organ sharing (UNOS) thoracic registry. J Card Fail 2004. [DOI: 10.1016/j.cardfail.2004.06.178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
84
|
Krishnamani R, Khabbaz KR, Li W, Patten RD, Konstam MA, Patel AR, Udelson JE, DeNofrio D. Comparison of the Early (1995–1998) and Late (1999–2001) Experience with the use of Implantable Left Ventricular Assist Devices on Post-Transplant Mortality: An Analysis of the United Network for Organ Sharing (UNOS) Thoracic Registry. J Card Fail 2004. [DOI: 10.1016/j.cardfail.2004.06.164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
85
|
Rabets JC, Jones JS, Patel AR, Zippe CD. Bupivacaine provides rapid, effective periprostatic anaesthesia for transrectal prostate biopsy. BJU Int 2004; 93:1216-7. [PMID: 15180608 DOI: 10.1111/j.1464-410x.2004.04843.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To examine the effectiveness of the longer acting agent bupivacaine in providing periprostatic anaesthesia during transrectal ultrasonography (TRUS)-guided biopsy, as the periprostatic injection of lidocaine has been shown to significantly alleviate the pain of this procedure. PATIENTS AND METHODS Seventy-five patients were randomized to receive a periprostatic injection with either bupivacaine, a lidocaine/bupivacaine (1/1) combination, or no local anaesthesia. Immediately before biopsy 5 mL of the anaesthetic was injected under TRUS guidance into the periprostatic nerves bilaterally. After taking a 10-core biopsy the patients were given a visual analogue scale (VAS; 0-10) to assess their pain during the procedure. RESULTS The mean VAS scores were 2.04 in the bupivacaine group and 4.46 in the control (no local anaesthetic) group (P < 0.001). CONCLUSIONS Bupivicaine provides significant, immediate periprostatic anaesthesia for TRUS biopsy.
Collapse
|
86
|
Patel AR, Kuvin JT, Sliney KA, Rand WM, Pandian NG, Karas RH. 1105-168 Gender differences in the identification of patients with coronary artery disease by brachial artery ultrasound. J Am Coll Cardiol 2004. [DOI: 10.1016/s0735-1097(04)92072-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
87
|
Patel AR, Kuvin JT, Sliney KA, Rand WM, Pandian NG, Karas RH. 1065-165 Brachial artery flow-mediated vasodilation correlates with exercise capacity in women. J Am Coll Cardiol 2004. [DOI: 10.1016/s0735-1097(04)91976-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
88
|
Kuvin JT, Patel AR, Sidhu M, Rand WM, Sliney KA, Pandian NG, Karas RH. Relation between high-density lipoprotein cholesterol and peripheral vasomotor function. Am J Cardiol 2003; 92:275-9. [PMID: 12888130 DOI: 10.1016/s0002-9149(03)00623-4] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Low levels of high-density lipoprotein (HDL) cholesterol are one of the most common lipid abnormalities in patients with coronary artery disease. Endothelial dysfunction is also highly prevalent in patients with coronary artery disease. We sought to determine whether HDL cholesterol levels are correlated with endothelium-dependent vasomotion in patients being evaluated for atherosclerosis. Peripheral vascular endothelial function was assessed by high-resolution brachial artery ultrasound. Flow-mediated dilation (FMD) during reactive hyperemia was defined as the percent change in arterial diameter following 5-minute arterial occlusion. All patients underwent stress testing with nuclear single-photon emission computed tomographic imaging to determine percent left ventricular ejection fraction and define the presence or absence of coronary artery disease. One hundred fifty-one subjects (87 men, 64 women) were enrolled (average age 58 +/- 11 years). Total cholesterol, HDL cholesterol, low-density lipoprotein cholesterol, and triglyceride levels were 188 +/- 48, 47 +/- 13, 108 +/- 37 and 154 +/- 88 mg/dl, respectively. The mean FMD for the entire group was 9.9 +/- 5.2%. Subjects with an HDL cholesterol of <40 mg/dl (n = 39) had lower FMD (7.4 +/- 3.6%) compared with those with an HDL cholesterol >/=40 mg/dl (11.0 +/- 5.5%, p <0.001). There was a significant correlation between FMD and HDL cholesterol level (linear regression, p <0.001), and in multivariate analysis, HDL cholesterol was an independent predictor of FMD. Peripheral endothelial function was abnormal in subjects with low HDL cholesterol and well-preserved in those with high HDL cholesterol. These data suggest that impaired endothelial function associated with low HDL cholesterol may be an additional, previously unrecognized mechanism contributing to the increased risk of atherosclerosis in these patients.
Collapse
|
89
|
Kuvin JT, Patel AR, Sliney KA, Pandian NG, Sheffy J, Schnall RP, Karas RH, Udelson JE. Assessment of peripheral vascular endothelial function with finger arterial pulse wave amplitude. Am Heart J 2003; 146:168-74. [PMID: 12851627 DOI: 10.1016/s0002-8703(03)00094-2] [Citation(s) in RCA: 574] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND Abnormalities in pulse wave amplitude (PWA) have been described in subjects with atherosclerosis and may be a marker of future cardiac events. We evaluated the relationship between changes in PWA of the finger and peripheral endothelial function. METHODS We performed measurements of PWA with a novel finger plethysmograph (peripheral arterial tonometry [PAT]) and compared the findings with a simultaneous noninvasive measurement of peripheral endothelial function with brachial artery ultrasound scanning (BAUS) in 89 subjects. The PAT hyperemia ratio was defined as the ratio of PWA during reactive hyperemia relative to the baseline. Flow-mediated dilation (FMD) was defined by BAUS as the ratio of the brachial artery diameter during reactive hyperemia relative to the baseline. Sixty-eight subjects underwent exercise myocardial perfusion imaging (ExMPI). RESULTS Fifty-four men and 35 women were examined. There was a linear relationship between the PAT hyperemia ratio and FMD during the same episode of reactive hyperemia (r = 0.55, P <.0001). Subjects in the lowest FMD quartile had the lowest PAT hyperemia ratio, whereas subjects in the highest FMD quartile had the highest PAT hyperemia ratio (P <.001 for trend). Similar to BAUS, the PAT hyperemia ratio was more impaired in subjects with cardiovascular risk factors and in subjects with ExMPI studies that were indicative of coronary artery disease. CONCLUSIONS Assessment of PWA with PAT demonstrates patterns of abnormality similar to that of BAUS assessment of FMD. PWA during reactive hyperemia is influenced by factors known to affect endothelial function, including cardiovascular risk factors and coronary artery disease. These findings support the concept that analysis of PWA with PAT during reactive hyperemia may be used to study peripheral vascular endothelial function.
Collapse
|
90
|
Patel AR, Kuvin JT, DeNofrio D, Kinan D, Sliney KA, Eranki KP, Pandian NG, Udelson JE, Konstam MA, Karas RH. Peripheral vascular endothelial function correlates with exercise capacity in cardiac transplant recipients. Am J Cardiol 2003; 91:897-9. [PMID: 12667585 DOI: 10.1016/s0002-9149(03)00033-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
91
|
Kuvin JT, Gokce N, Holbrook M, Hunter LM, Patel AR, Sliney KA, Craven DE, Grayston JT, Keaney JF, Karas RH, Vita JA. Effect of short-term antibiotic treatment on Chlamydia pneumoniae and peripheral endothelial function. Am J Cardiol 2003; 91:732-5. [PMID: 12633811 DOI: 10.1016/s0002-9149(02)03417-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
92
|
Kuvin JT, Patel AR, Sidhu M, Rand WM, Sliney KA, Pandian NG, Karas RH. The relationship between high-density lipoprotein cholesterol and vasomotor function. J Am Coll Cardiol 2003. [DOI: 10.1016/s0735-1097(03)81690-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
93
|
|
94
|
Mohan JC, Patel AR, Passey R, Gupta D, Kumar M, Arora R, Pandian NG. Is the mitral valve area flow-dependent in mitral stenosis? A dobutamine stress echocardiographic study. J Am Coll Cardiol 2002; 40:1809-15. [PMID: 12446065 DOI: 10.1016/s0735-1097(02)02487-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES The purpose of this study was to compare the effect of changes in flow rate on the mitral valve area (MVA) derived from two-dimensional echocardiographic planimetry and Doppler pressure half-time (PHT) methods in patients with mitral stenosis (MS). BACKGROUND Dobutamine stress echocardiography has been proposed as a means of assessing the severity of MS. However, data regarding the effect of an increase in flow rate on MVA are limited. If MVA is indeed flow-dependent, this has important implications for the assessment of the severity of MS, particularly in the setting of reduced cardiac output (CO). METHODS Dobutamine echocardiography was performed in 57 patients with isolated MS who were in sinus rhythm. The MVA was determined by planimetry and Doppler PHT methods. RESULTS Cardiac output increased by > or =50% in 27 patients (group I) and by <50% in 30 patients (group II). In group I, the MVA by planimetry increased by only 10.6 +/- 2% and the MVA by PHT increased by 21.9 +/- 4.8%. These changes were similar to those observed in group II (10.7 +/- 3% and 14.8 +/- 4%, respectively; p = NS), despite a much smaller increase in CO. A clinically important change (from the severe to mild category) occurred in only one patient when using the PHT method and in none by planimetry. CONCLUSIONS Changes in flow rate result in small but clinically insignificant changes in echocardiographic MVA measurement. These methods provide an accurate assessment of MS severity in a majority of patients, independent of changes in flow rate.
Collapse
|
95
|
|
96
|
Kuvin JT, Rämet ME, Patel AR, Pandian NG, Mendelsohn ME, Karas RH. A novel mechanism for the beneficial vascular effects of high-density lipoprotein cholesterol: enhanced vasorelaxation and increased endothelial nitric oxide synthase expression. Am Heart J 2002; 144:165-72. [PMID: 12094204 DOI: 10.1067/mhj.2002.123145] [Citation(s) in RCA: 179] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND Low levels of high-density lipoprotein (HDL) cholesterol increase the risk of coronary artery disease (CAD), and recent clinical studies suggest that interventions in low-HDL patients are beneficial. The purpose of this study was to examine the effect of increased HDL levels on endothelium-dependent vasodilation. METHODS We studied patients with CAD with a low-density lipoprotein (LDL) level of <100 mg/dL. Patients with an HDL level of < or =36 mg/dL were treated with niacin (n = 11), and patients with an HDL level of >36 mg/dL were followed as controls (n = 10). Baseline and 3-month follow-up studies of flow-mediated dilation (FMD) and blood lipid levels were obtained. RESULTS HDL levels increased from 30.1 +/- 1.2 to 40.5 +/- 1.2 mg/dL in the niacin-treated patients (P <.001) but remained unchanged in the control patients. At baseline, FMD was impaired in both the treated (6.5% +/- 1%) and the control (7.3% +/- 1%) patients compared with 10 healthy subjects (16% +/- 2%, P <.01). After 3 months, FMD improved in the niacin-treated patients (11.8% +/- 1%, P =.001) but remained unchanged in the control patients (6.2% +/- 1%). Exposure of cultured human vascular endothelial cells to HDL in vitro enhanced expression of endothelial nitric oxide synthase (eNOS), as shown by immunoblotting. CONCLUSIONS In patients with CAD and well-controlled LDL levels, elevation of HDL with niacin improves endothelial function. HDL increases eNOS protein expression in cultured vascular endothelial cells. Taken together, these observations suggest that HDL-mediated increases in eNOS expression may contribute to the observed enhancement in vasorelaxation and thus support a previously unrecognized mechanism for the beneficial cardiovascular effects of HDL.
Collapse
|
97
|
Patel AR, Kuvin JT, DeNofrio D, Kinan D, Sliney KA, Eranki KP, Pandian NG, Udelson JE, Konstam MA, Karas RH. Peripheral vascular endothelial function predicts exercise capacity in cardiac transplant recipients. J Am Coll Cardiol 2002. [DOI: 10.1016/s0735-1097(02)80640-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
98
|
Abstract
Treatment strategies for patients with heart failure and left ventricular systolic dysfunction continue to evolve as the complex pathophysiology of this disease is better understood. A number of advances have been made in recent years, most notably the addition of beta-receptor antagonists. In addition, recent studies have provided important information regarding the utility of angiotensin receptor antagonists, aldosterone receptor antagonists, and natriuretic peptides in the management of heart failure. Nonpharmacologic advances include resynchronization therapy, which appears to confer symptomatic improvement in some patients, and improvements in ventricular assist device technology. As the importance of neurohormonal activation in the progression of heart failure becomes increasingly apparent, new therapeutic strategies targeting these neurohormonal systems are being investigated.
Collapse
|
99
|
Kuvin JT, Patel AR, Sliney KA, Pandian NG, Rand WM, Udelson JE, Karas RH. Peripheral vascular endothelial function testing as a noninvasive indicator of coronary artery disease. J Am Coll Cardiol 2001; 38:1843-9. [PMID: 11738283 DOI: 10.1016/s0735-1097(01)01657-6] [Citation(s) in RCA: 195] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVES We studied whether assessment of endothelium-dependent vasomotion (EDV) with brachial artery ultrasound (BAUS) imaging predicts the presence or absence of coronary artery disease (CAD) as defined by exercise myocardial perfusion imaging (ExMPI). BACKGROUND Abnormalities in EDV can be detected in arteries before the development of overt atherosclerosis, and its presence may predict poor long-term prognosis. Brachial artery ultrasound during reactive hyperemia is a noninvasive method of assessing peripheral EDV. METHODS Clinically-indicated ExMPI along with BAUS were performed in 94 subjects (43 women, 51 men). Coronary artery disease was defined by myocardial ischemia or infarction on single photon emission computed tomography images. Flow-mediated dilation (FMD) after upper arm occlusion was defined as the percent change in arterial diameter during reactive hyperemia relative to the baseline. RESULTS Subjects with CAD by ExMPI (n = 23) had a lower FMD (6.3 +/- 0.7%) than those without CAD by ExMPI (n = 71) (10.5 +/- 0.6%; p = 0.0004). Flow-mediated dilation was highly predictive for CAD with an odds ratio of 1.32 for each percent decrease in FMD (p = 0.001). Based on a receiver-operator analysis, an FMD of 10% was used as a cut-point for further analysis. Twenty-one of 23 subjects who were positive for ExMPI had an FMD < 10% (sensitivity 91%), whereas only two of 40 subjects with an FMD > or =10% were ExMPI-positive (negative predictive value: 95%). There was a correlation between the number of cardiac risk factors and FMD. Individuals with an FMD < 10% exercised for a shorter duration than those with an FMD > or =10% (456 +/- 24 vs. 544 +/- 31 s, respectively; p = 0.02). CONCLUSIONS Assessment of EDV with BAUS has a high sensitivity and an excellent negative predictive value for CAD and, thus, has the potential for use as a screening tool to exclude CAD in low-risk subjects. Further standardization of BAUS is required, however, before specific cut-points for excluding CAD can be established.
Collapse
|
100
|
Patel AR, Engstrom JE, Tusing LD, McNeeley KJ, Chelimsky TC. Lower body negative pressure: a test of cardiovascular autonomic function. Muscle Nerve 2001; 24:481-7. [PMID: 11268019 DOI: 10.1002/mus.1030] [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: 11/06/2022]
Abstract
Lower body negative pressure (LBNP) may provide an alternative test of cardiovascular autonomic function for patients unable to perform the Valsalva maneuver (VM). LBNP at -40 mmHg for 30 s was compared to the VM at 40 mmHg for 15 s with heart rate and blood pressure measured continuously in three age groups: 10-25 years; 26-40 years; and 41-55 years. Heart rate and blood pressure responses were comparable, with moderately diminished changes in blood pressure and heart rate in the LBNP test. When heart response to LBNP was converted to a ratio similar to that calculated for the VM, a high degree of correlation was found (R(2) = 0.5711). The LBNP test shows promise as an alternative test of cardiovascular autonomic function based on studies in normal subjects. The less marked changes may relate to the more passive nature of the applied stress. Future work should improve the device's accessibility and establish values for patients with autonomic disorders.
Collapse
|