Use of virtual reality simulation for mission rehearsal for carotid stenting.
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Carotid Stenosis↗
Biomedical subjects
Amar D Patel
Publications and source records attributed to Amar D Patel.
Gender differences in short-term cardiovascular outcomes after percutaneous coronary interventions.
Recent studies have been inconsistent in demonstrating a decrease in the gender gap in short-term post-percutaneous coronary intervention (PCI) outcomes. We sought to determine gender differences in outcomes in younger and older patients who underwent PCI during the current stent era. We studied 4,768 elective PCI procedures performed at Emory University Hospital from 2001 to 2004. The baseline characteristics, periprocedural complications, angiographic success, procedural success, and major in-hospital complications (death, myocardial infarction, and emergency coronary artery bypass graft surgery) after PCI were compared between men and women. Women were more likely to be nonwhite and older, with a greater prevalence of hypertension and diabetes mellitus (all p <0.001) compared with men. After adjusting for baseline characteristics and coronary artery size, the incidence of coronary vascular injury complications was higher in women than in men, particularly in patients 55 years (OR 1.32, 95% CI 0.87 to 1.99, p = 0.047 for gender-age interaction). The adjusted odds of bleeding complications were also higher in women than in men ( 55 years OR 2.55, 95% CI 1.68 to 3.87, p = 0.121 for gender-age interaction). No significant gender differences were present in a combined end point of death, myocardial infarction, and emergency coronary artery bypass graft surgery. In conclusion, among patients who have undergone PCI, women, particularly younger women, are more likely than men to experience coronary vascular injury and bleeding complications unaccounted for by coronary artery size and other patient characteristics. No differences were found in major in-hospital complications by gender.
Aged↗
Learning curves and reliability measures for virtual reality simulation in the performance assessment of carotid angiography.
OBJECTIVES: Improvement in performance as measured by metric-based procedural errors must be demonstrated if virtual reality (VR) simulation is to be used as a valid means of proficiency assessment and improvement in procedural-based medical skills. BACKGROUND: The Food and Drug Administration requires completion of VR simulation training for physicians learning to perform carotid stenting. METHODS: Interventional cardiologists (n = 20) participating in the Emory NeuroAnatomy Carotid Training program underwent an instructional course on carotid angiography and then performed five serial simulated carotid angiograms on the Vascular Interventional System Trainer (VIST) VR simulator (Mentice AB, Gothenburg, Sweden). Of the subjects, 90% completed the full assessment. Procedure time (PT), fluoroscopy time (FT), contrast volume, and composite catheter handling errors (CE) were recorded by the simulator. RESULTS: An improvement was noted in PT, contrast volume, FT, and CE when comparing the subjects' first and last simulations (all p < 0.05). The internal consistency of the VIST VR simulator as assessed with standardized coefficient alpha was high (range 0.81 to 0.93), except for FT (alpha = 0.36). Test-retest reliability was high for CE (r = 0.9, p = 0.0001). CONCLUSIONS: A learning curve with improved performance was demonstrated on the VIST simulator. This study represents the largest collection of such data to date in carotid VR simulation and is the first report to establish the internal consistency of the VIST simulator and its test-retest reliability across several metrics. These metrics are fundamental benchmarks in the validation of any measurement device. Composite catheter handling errors represent measurable dynamic metrics with high test-retest reliability that are required for the high-stakes assessment of procedural skills.
Cardiology↗
Effect of lipid levels and lipid-lowering therapy on restenosis after coronary artery stenting.
BACKGROUND: Recent experimental and clinical data suggest that lowering serum lipid levels with statins may prevent or delay the process of restenosis. The purpose of this trial is to determine whether lipid levels relate to restenosis and/or whether statin therapy can prevent or delay the process of restenosis after intracoronary stenting. METHODS: One hundred thirty-six patients who underwent single coronary artery stenting from June 1995 to June 1997 in our institution were included in the study. All these patients were followed for at least 9 months (mean 392+/-148 days) for major adverse cardiac events (MACE). We defined as MACE the occurrence of death, myocardial infarction, or need for target lesion revascularization. From this cohort, 103 patients had at least one lipid parameter from the lipid profile evaluated within 2 months from the date of the procedure. Patients who had the stent because of an acute myocardial infarction were included in the study only if their lipid profile was evaluated before or at least 6 weeks after the event. Patients with triglyceride levels above 500 had both triglyceride and low-density lipoprotein cholesterol levels excluded from the statistical analysis. Patients were divided into two groups based on lipid levels: normal (Group I; n=31) and elevated (Group II; n=72). Patient outcomes were also analyzed by statin therapy use. RESULTS: There was no significant difference in MACE rates between the two groups when outcomes were analyzed by lipid levels (22.6% versus 20.8% P=0.8). Furthermore, outcomes were analyzed by use of statin therapy (Group III, n=53, on statin versus Group IV, n=50, on no statin). There was also no difference in MACE rates between the two groups (20.8% versus 22%; P=0.8). CONCLUSION: The process of restenosis has unique features that differentiate it from atherosclerosis. Although lipid-lowering therapy is crucial in delaying the process of atherosclerosis, its role in the prevention of restenosis is yet to be proven.
Aged↗
Cocaine use in an urban medical population and the development of angiographically significant coronary artery disease.
Cocaine is a common drug of abuse in the United States. Although long-term cocaine use has been associated with premature coronary artery disease (CAD), the relationship between cocaine use and the presence of angiographically significant CAD (> or =70%) is not clear. A retrospective analysis of all patients who had undergone cardiac catheterization at an urban medical center over a 1-year period was performed. Five hundred twelve patients were enrolled in the study; 84 (16.4%) had evidence of cocaine use, and 111 (21.7%) were admitted with a myocardial infarction. At the time of cardiac catheterization, 31 (36.9%) cocaine-positive patients had > or =70% stenosis in at least one epicardial vessel, compared with 200 (46.7%) cocaine-negative patients (p = 0.09). Although a trend toward an association was noted on unadjusted analysis, after adjusting for CAD risk factors, cocaine use was not associated with angiographically significant CAD (odds ratio, 0.9; 95% confidence interval, 0.55-1.5; p = 0.7).
Cardiac Catheterization↗
Approaching cardiac arrhythmias in the elderly patient.
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Aged↗
Management strategies of dyslipidemia in the elderly: 2005.
During the past 3 years, the treatment of dyslipidemia has evolved significantly. The impact of recent trial data on management strategies in older patients is especially important, because the elderly segment of the US population continues to grow. Several clinical trials have been completed since the publication of the National Cholesterol Education Program (NCEP) Adult Treatment Panel III guidelines were published in 2001. Recent trial data strongly support the use of lipid-lowering therapy in the elderly population. Although therapeutic lifestyle changes remain highly important, supplementation with lipid-lowering therapy has been shown to reduce the risk of cardiovascular events in both primary and secondary prevention models. Compelling data noted from recent clinical trials have prompted the NCEP to publish an updated report that addresses the significant interim developments.
Aged↗
Evidence-based management of coronary artery disease in the elderly--current perspectives.
Cardiovascular disease accounts for significant morbidity and mortality in the elderly. The clinical trial data available to guide therapy in this growing population subset are relatively limited. This review will focus on treatment approaches and recommendations obtained from subgroup analyses of elderly patients from major clinical trials for the management of chronic stable angina, acute coronary syndromes (unstable angina and non-ST-segment elevation myocardial infarction), and coronary revascularization. Recent advances in the treatment of stable angina have shown that use of angiotensin-converting enzyme inhibitors and lipid-lowering therapy as adjunctive measures show benefit in the elderly by reducing the occurrence of death, nonfatal myocardial infarction, and unstable angina. However, if patients experience disabling or unstable anginal symptoms despite effective medical therapy, coronary revascularization must be considered. Several clinical trials have shown a significant reduction in major adverse cardiac events when using intravenous glycoprotein receptor antagonists periprocedurally during percutaneous revascularization approaches in elderly patients with unstable angina or non-ST-segment elevation myocardial infarction, especially when these measures are performed as soon as possible. However, the success of myocardial revascularization by a percutaneous or surgical approach is highly dependent on the patient's associated comorbidities, especially in patients over age 80 years.
Aged↗
Evidence-based management of acute myocardial infarction in the elderly--current perspectives.
Cardiovascular disease accounts for significant morbidity and mortality in the elderly. Despite several, large cardiovascular clinical trials, data to guide therapy in this growing population subset are relatively limited. This review focuses on treatment approaches and recommendations for the management of elderly patients with acute myocardial infarction (MI) obtained from subgroup analyses from major clinical trials.Treatment options for acute MI in the elderly have changed dramatically since the 1990s. Reperfusion therapy by primary percutaneous coronary intervention has superseded the use of thrombolytic therapy for the treatment of acute ST-elevation myocardial infarction (STEMI). Clinical trial data have demonstrated that even transferring patients to facilities that have primary angioplasty capabilities is better than thrombolytic therapy, if the anticipated transfer time is of acceptable duration. Additionally, adjunctive use of the intravenous glycoprotein (GP) receptor antagonist, abciximab, during primary angioplasty affords a reduction in the composite primary end point of death, reinfarction, and target vessel revascularization, with much of the benefit derived from the latter. Thrombolytic therapy, barring any contraindication, must be used when mechanical revascularization is not available; however, the risk for complications in the elderly is higher, especially for those 75 years and older. Studies investigating the use of thrombolytics plus GP receptor antagonists with and without percutaneous coronary intervention show questionable benefit in the elderly.
Aged↗
Coronary artery vasospasm during dobutamine stress echocardiography.
Compared with the frequent occurrence of S-T segment depression, the development of S-T segment elevation during dobutamine stress echocardiography is a relatively rare finding, especially in the setting of nonobstructive coronary artery disease. We present two patients who developed chest discomfort with S-T segment elevation during dobutamine stress testing. Both patients had unremarkable baseline echocardiograms and no history suggestive of coronary vasospasm. Subsequent coronary angiography revealed nonobstructive disease. It is speculated that the likely presence of endothelial dysfunction coupled with mild coronary atherosclerosis caused an imbalance between the coronary vasodilatory and vasoconstrictive forces. The inhibition of the vasodilatory effects of beta-adrenergic receptor stimulation and flow-mediated dilation of dobutamine was overcome by the vasoconstrictive effects of dobutamine-stimulated alpha-1 receptor activation; thus, contributing to the development of coronary vasospasm. This condition is important to recognize and appreciate as the initial treatment for this condition favors the use of nitrates over beta-blockade.
Adult↗
Usefulness of preoperative stress perfusion imaging in predicting prognosis after liver transplantation.
The role of preoperative stress single-photon emission computed tomographic (SPECT) imaging in patients with end-stage liver disease who underwent liver transplantation is not well established. We reviewed medical records of patients who had liver transplantation at our institution between January 1998 and November 2001. During this time, 339 patients (213 men, aged 51 +/- 11 years) underwent liver transplantation. Of these, 87 patients had preoperative stress SPECT imaging. Diabetes mellitus (30% vs 11%), hypertension (26% vs 12%), and coronary artery disease (15% vs 7%) were more prevalent in those with than without SPECT (p <0.01 each). The stress SPECT perfusion images were normal in 78 patients (91%) and the left ventricular ejection fraction was 72 +/- 10%. SPECT images revealed ascites in 66% and splenomegaly in 83% of patients. There were 35 total deaths (10%) and 5 nonfatal myocardial infarctions over a mean follow-up of 21 +/- 13 months. Most deaths (32 of 35) were noncardiac and sepsis was the most common cause of death. A normal SPECT study had a 99% negative predictive value for perioperative cardiac events. Kaplan-Meier survival curves showed an 87% 2-year cumulative survival rate in the total group. Thus, in patients undergoing liver transplantation, 2-year survival depends on early noncardiac events. A normal stress SPECT study identified patients at a very low risk for early and late cardiac events despite a higher risk profile. SPECT images also revealed unique findings, such as ascites and splenomegaly, which could produce image artifacts and may interfere with accurate image interpretation.
Adenosine↗
Prognostic value of myocardial perfusion imaging in predicting outcome after renal transplantation.
Cardiovascular disease is a significant cause of morbidity and mortality after renal transplantation. Pretransplant screening in a subset of these patients for occult coronary artery disease (CAD) may improve outcome. The objective of this study was to examine the outcome of 600 patients after renal transplantation for end-stage renal disease. Prospective outcome data were collected on 600 consecutive patients who had renal transplantation between 1996 and 1998 at our institution at 42 +/- 12 months after surgery. Stress single-photon emission computed tomographic (SPECT) myocardial perfusion imaging was performed in 174 patients before surgery, 136 (78%) of whom had diabetes mellitus. There were a total of 59 events: 17 cardiac deaths, 14 nonfatal myocardial infarctions, and 28 noncardiac deaths. There were 12 cardiac events and 11 noncardiac deaths among those who had SPECT myocardial perfusion imaging. In a multivariate analysis that included important risk factors, age (p = 0.03 and 0.003, respectively) and diabetes (p = 0.02 and 0.005, respectively) were the predictors of total events and cardiac events in patients who did not undergo stress SPECT perfusion imaging. In the subgroup who had stress perfusion imaging, an abnormal perfusion SPECT study was the only predictor of cardiac events (p = 0.006). The 42-month cardiac event-free survival rate was 97% in patients with normal SPECT images and 85% in patients with abnormal SPECT images (RR 5.04, 95% confidence interval 1.4 to 17.6, p = 0.006). Thus, there is a 2.8% event rate per year after renal transplantation, and approximately 50% of these events are noncardiac. In high-risk patients (most of whom had diabetes) with preoperative stress perfusion imaging, those with normal images had significantly lower cardiac events than those with abnormal images. These results have important implications in patient screening and postoperative management.
Adult↗
Role of single photon emission computed tomography imaging in the evaluation of therapy for angina pectoris.
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Angina Pectoris↗
Platypnea-orthodeoxia in a patient with ostium primum atrial septal defect with normal right heart pressures.
We describe an adult patient with an ostium primum atrial septal defect (ASD) and a patent foramen ovale (PFO) with normal right heart pressures who presented with platypnea and orthodeoxia. A dilated aortic root encroaching into the region of the ASD and PFO, along with a tricuspid regurgitant jet moving into the left atrium through the ASD found on the transesophageal echocardiogram may have been responsible for orthodeoxia. Surgical closure of these defects resulted in the disappearance of both platypnea and orthodeoxia.
Echocardiography, Transesophageal↗
Diagnostic modalities for the evaluation of anomalous left main coronary arteries.
Anomalous coronary arteries are rare and usually identified as an incidental finding during cardiac catheterization. The particular difficulty with cardiac catheterization techniques is not necessarily the presence of the anomalous coronary artery, but its anatomic course. Oftentimes, surgical intervention is necessary once these anomalies are discovered. The identification and anatomic characterization of anomalous coronary arteries has been significantly advanced with the use of current diagnostic noninvasive imaging modalities. We present 3 cases of an anomalous left main coronary artery that arises from the right sinus of Valsalva. Noninvasive imaging methods provided a clear anatomic course of the anomalous vessel.
Adult↗
Detection of pericardial effusion during Tc-99m sestamibi cardiac imaging.
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Adenosine↗
Rupture of both papillary muscles after acute myocardial infarction: a case report.
The authors report a case of transthoracic echocardiographic left ventriculography and surgical pathology findings of a patient with rupture of both papillary muscles after acute myocardial infarction.
Aged↗