Angiography In Evaluation Of Patients Research Articles

Role of Multi Detector Computed Tomography Cervicocerebral Angiography in Evaluation of Patients with Stroke

Background: Stroke is the second single most common cause of death in the world causing approximately 6.7 million deaths each year. It has a greater disability impact on an individual than any other chronic disease. The aim of the study is to review the value of CTA in detection and evaluation of non-traumatic cervicocerebral vascular disease (stroke). Subjects & Methods: A prospective observational study conducted in the Department of Radiodiagnosis, Kamineni Hospitals, L.B. Nagar, Hyderabad over 60 patients during April 2016 to May 2017. Results: Out of 60 patients, 35(58.3%) patients had ischemic stroke, 25(41.6%) had hemorrhagic stroke. Overall stroke was seen mostly in the age group of 61-70 (28.3%) years, with a Male to female ratio of 3:2. Conclusion: Hypertension was the most common risk factor associated with this disease, followed by diabetes. CTA helps in accurate diagnosis, risk stratification and planning management protocols.

Mesenteric ischemia: can multidetector computed tomography angiography be a one-stop diagnostic solution?

Background Mesenteric ischemia is a medical condition in which inflammation and injury of the small intestine result from inadequate blood supply. Mesenteric ischemia is caused by a reduction in intestinal blood flow and is classified as acute (sudden onset of intestinal hypoperfusion) or chronic depending on the time course of symptoms. Multi Detector Computed Tomography MDCT has high sensitivity and specificity for diagnosing acute primary mesenteric ischemia. Aim and objectives Our objective was to evaluate the role of MDCT angiography in evaluation of patients with suspected mesenteric ischemia as regards vascular and intestinal abnormalities. Patients and methods This prospective study was performed on 60 patients clinically suspected of having mesenteric ischemia, referred to the radiology department of Cairo University hospitals from the emergency hospital and the out-patient clinics and in-patient departments of general surgery and of Endemic Infectious diseases and Hepatogastroenterology. Patients suspected clinically to have mesenteric ischemia were initially examined by Doppler and if showed mesenteric vascular suspicious findings by Doppler, they were referred to CT angiography examination. Results In our study we found that 40 patients (66.7%) out of 60 patients showed abnormal MDCT findings which explained the cause of mesenteric ischemia in these patients. The most prevalent CT findings in 40 patients with positive CT angiographic findings in acute mesenteric ischemia (AMI) were bowel wall thickening in 12 patients (30%), bowel distension in 8 patients (20%) and lack of mural enhancement in 10 patients (25%). Computed tomography angiography (CTA) detected accurately the cause of AMI where arterial thrombo-embolism was common cause of AMI (62.5%) and the SMA was the most frequent site in patients with AMI than mesenteric venous thrombosis with AMI (37.5%). 50% of patients with AMI showed pneumatosis intestinalis and surgical exploration revealed bowel infarction and resection anastomosis was done. Conclusion MDCT is fast, safe, accurate and non-invasive imaging modality of choice in patients with suspected mesenteric ischemia which is able to evaluate not only mesenteric vascular structures but also evaluate bowel wall changes and adjacent mesentery, thus detecting the primary cause of mesenteric ischemia that can lead to earlier diagnosis and intervention, also confirmation or exclusion of various other differential diagnoses of acute abdominal conditions.

The Potential Role of Combined Highly Sensitive Troponin and Coronary Computed Tomography Angiography in the Evaluation of Patients with Suspected Acute Coronary Syndrome in the Emergency Department

The evaluation and triage of patients presenting to the emergency department (ED) with suspected acute coronary syndrome (ACS) remains to be challenging despite available guidelines and clinical evidence. The current guidelines in the USA recommend clinical risk assessment based on cardiovascular risk factors followed by serial electrocardiograms and conventional cardiac troponin measurements, which are supplemented by advanced non-invasive cardiac testing in the majority of patients. This approach is safe, but leads to a lengthy work-up and high cost of care. There is clinical need for diagnostic strategies that will lead to rapid and reliable triage of patients with suspected ACS. In this review, we will summarize the experience and evidence for the use of highly sensitive troponin (hsTn) in the rapid and efficient evaluation of patients with suspected ACS. We will also review the available literature on the use of coronary computed tomography angiography (CTA) in the rapid evaluation of patients with suspected ACS. We will discuss the opportunities for the combined use of hsTn and coronary CTA in this population. Finally, we will outline the possible implementation of combined use of hsTn and coronary CTA in the evaluation of patients with suspected ACS in the ED.

Cerebral Angiography for Evaluation of Patients with CT Angiogram-Negative Subarachnoid Hemorrhage: An 11-Year Experience.

CT angiography is increasingly used to evaluate patients with nontraumatic subarachnoid hemorrhage given its high sensitivity for aneurysms. We investigated the yield of digital subtraction angiography among patients with SAH or intraventricular hemorrhage and a negative CTA. An 11-year, single-center retrospective review of all consecutive patients with CTA-negative SAH was performed. Noncontrast head CT, CTA, DSA, and MR imaging studies were reviewed by 2 experienced interventional neuroradiologists and 1 neuroradiologist. Two hundred thirty patients (mean age, 54 years; 51% male) with CTA-negative SAH were identified. The pattern of SAH was diffuse (40%), perimesencephalic (31%), sulcal (31%), isolated IVH (6%), or identified by xanthochromia (7%). Initial DSA yield was 13%, including vasculitis/vasculopathy (7%), aneurysm (5%), arteriovenous malformation (0.5%), and dural arteriovenous fistula (0.5%). An additional 6 aneurysms/pseudoaneurysms (4%) were identified by follow-up DSA, and a single cavernous malformation (0.4%) was identified by MRI. No cause of hemorrhage was identified in any patient presenting with isolated intraventricular hemorrhage or xanthochromia. Diffuse SAH was due to aneurysm rupture (17%); perimesencephalic SAH was due to aneurysm rupture (3%) or vasculitis/vasculopathy (1.5%); and sulcal SAH was due to vasculitis/vasculopathy (32%), arteriovenous malformation (3%), or dural arteriovenous fistula (3%). DSA identifies vascular pathology in 13% of patients with CTA-negative SAH. Aneurysms or pseudoaneurysms are identified in an additional 4% of patients by repeat DSA following an initially negative DSA. All patients with CT-negative SAH should be considered for DSA. The pattern of SAH may suggest the cause of hemorrhage, and aneurysms should specifically be sought with diffuse or perimesencephalic SAH.

Safety and efficiency of outpatient versus emergency department-based coronary CT angiography for evaluation of patients with potential ischemic chest pain

BackgroundWhile coronary CT angiography (coronary CTA) may be comparable to standard care in diagnosing acute coronary syndrome (ACS) in emergency department (ED) chest pain patients, it has traditionally been obtained prior to ED discharge and a strategy of delayed outpatient coronary CTA following an ED visit has not been evaluated. ObjectiveTo investigate the safety of discharging stable ED patients and obtaining outpatient CCTA. MethodsAt two urban Canadian EDs, patients up to 65 years with chest pain but no findings indicating presence of ACS were further evaluated depending upon time of presentation: (1) ED-based coronary CTA during normal working hours, (2) or outpatient coronary CTA within 72 hours at other times. All data were collected prospectively. The primary outcome was the proportion of patients who had an outpatient coronary CTA ordered and had a predefined major adverse cardiac event (MACE) between ED discharge and outpatient CT; secondary outcome was the ED length of stay in both groups. ResultsFrom July 1, 2012 to June 30, 2014, we enrolled 521 consecutive patients: 350 with outpatient CT and 171 with ED-based CT. Demographics and risk factors were similar in both cohorts. No outpatient CT patients had a MACE prior to coronary CTA. (0.0%, 95% CI 0 to 0.9%) The median length of stay for ED-based evaluation was 6.6 hours (interquartile range 5.4 to 8.3 hours) while the outpatient group had a median length of stay of 7.0 hours (IQR 6.0 to 9.8 hours, n.s.). ConclusionsIn ED chest pain patients with a low risk of ACS, performing coronary CTA as an outpatient may be a safe strategy.

Computed Tomography Pulmonary Angiography for Evaluation of Patients With Suspected Pulmonary Embolism: Use or Overuse.

Background:The use of computed tomography pulmonary angiography (CTPA) has been increased during the last decade.Objectives:We studied the adherence to current diagnostic recommendations for evaluation of pulmonary embolism in a teaching hospital of Tehran University of Medical Sciences.Patients and Methods:The registered medical records (Wells scores and serum D-dimer level) of all patients whose CTPA was performed with suspicion of pulmonary thromboembolism (PTE) were studied retrospectively. Modified Wells score of each patient was determined without being aware of the CTPA results. The patients were categorized to those with a high (likely) clinical probability (score > 4) and low (unlikely) clinical probability (score≤ 4) of PTE.Results:During a 6-month period, 82 patients who underwent CTPA were included. The prevalence of PTE was 62.2% in the group of subjects with a likely clinical risk. In 45 (54.8%) of those patients whose CTPA was requested, the PTE was unlikely based on modified Wells criteria. In the clinically unlikely group, serum D-dimer assay was done in 15 out of 45 (33.3%), while it was inappropriately checked in 10 out of 37 (27.0%) with a clinically likely risk. General adherence rate to diagnostic algorithm of PTE was 43.9%.Conclusion:There is still excessive unjustified concern of PTE in less trained physicians leading to excessive diagnostic work-up. Loyalty to the existing guideline for management of suspected PTE in educational hospitals and supervision of attending physicians could prevent overuse of CTPA.

High-resolution coronary MR angiography for evaluation of patients with anomalous coronary arteries: visualization of the intramural segment.

Anomalous origin of the coronary artery from the contralateral coronary sinus is a rare coronary anomaly associated with sudden death. The inter-arterial course is most closely associated with sudden death, but it has been suggested that the presence of an intramural segment of a right anomalous coronary is associated with more symptoms and therefore may be an important criterion for intervention in these patients. To demonstrate that MR angiography can accurately determine the presence or absence of an intramural segment in an anomalous coronary artery. All studies of children who underwent MR angiography for the evaluation of an anomalous coronary artery were retrospectively reviewed by two pediatric radiologists in consensus. Criteria for an intramural anomalous coronary artery were the presence of a small or slit-like ostium and the relative smaller size of the proximal intramural portion of the coronary artery in relation to the more distal epicardial coronary artery. The anomalous coronary artery was classified as not intramural if these two findings were absent. These findings were correlated with operative reports confirming the presence or absence of an intramural segment. Twelve patients (86%) met MR angiography criteria for the presence of an intramural course. Only 2 patients (14%) met MR angiography criteria for a non-intramural course. When correlating with intraoperative findings, MR angiography was successful in distinguishing between intramural and non-intramural anomalous coronary arteries in all cases (P = 0.01). MR angiography may be able to reliably identify the intramural segment of an anomalous coronary artery in older children using the imaging criteria of a small or slit-like ostium and relative decrease in size of the proximal portion of the anomalous coronary artery compared to the distal portion of the anomalous coronary artery. Determining the presence of the intramural segment may help with surgical planning and may be an important criterion for the determination of intervention in patients with inter-arterial anomalous right coronary arteries.

Evaluation of Leg Pain

Few patient complaints offer such a large range of acuity and differential diagnoses as the complaint of leg pain. This is in part due to the multiple organ systems at play, including cardiac, pulmonary, musculoskeletal, neurologic, vascular, and dermatologic. The surgeon is frequently presented with the challenge of identifying and managing these complaints in a variety of settings. Management involves a spectrum from conservative care to surgical intervention where appropriate. The wide array of symptoms, signs, and often contradictory test results can be confusing and frustrating to patients and physicians alike, leading to delays and errors in diagnosis and ineffective management. This review offers a sequential and ordered approach to the evaluation of leg pain. Tables highlight atherosclerotic risk factors, vascular causes of lower extremity pain, the classification of acute limb ischemia, the ankle-brachial index and corresponding peripheral arterial disease, and the revised cardiac risk score for preoperative risk. Figures show bilateral lower extremity ischemia, chronic ischemic changes to the foot, classic dry gangrene, wet gangrene, acute limb ischemia, Charcot foot, segmental waveform and pulse volume recording analysis of the bilateral lower extremities, and angiographic evaluation of patients with aortoiliac and tibial disease. This review contains 10 figures, 5 tables, and 55 references.

Cost-Effectiveness of Coronary CT Angiography in Evaluation of Patients Without Symptoms Who Have Positive Stress Test Results

Patients without symptoms who have positive stress test results are often referred for diagnostic catheter angiography in an evaluation for coronary artery disease (CAD). The purpose of this study was to use decision tree analysis to determine the cost-effectiveness and radiation dose that would result from performing coronary CT angiography (CTA) before catheterization. A decision tree was constructed to compare the false-negative rates, false-positive rates, costs, and radiation exposure of direct referral of patients for cardiac catheterization with the values associated with performing coronary CTA before catheterization. We assumed that patients referred for coronary CTA proceed to catheterization only when significant disease is identified. Costs for coronary CTA and diagnostic catheterization were obtained from the 2009 physician Medicare fee schedule. Sensitivity, specificity, and radiation dose were obtained by literature review. Cost reduction with coronary CTA depends on the prevalence of coronary artery disease, but overall costs are reduced as long as the prevalence is less than 85%. At a 50% prevalence of coronary artery disease, performing coronary CTA before cardiac catheterization results in an average cost saving of $789 per patient with a false-negative rate of 2.5% and average additional radiation exposure of 1-2 mSv. Performing coronary CTA before cardiac catheterization is a cost-effective strategy in the care of patients without symptoms who have positive stress test results when the probability that the patient has significant coronary artery disease is less than 50%. The false-negative rate with this strategy compares favorably with the false-negative rate of stress testing. The use of coronary CTA in this role can avoid many unnecessary cardiac catheterization procedures.

Comparison of Usefulness of Exercise Testing Versus Coronary Computed Tomographic Angiography for Evaluation of Patients Suspected of Having Coronary Artery Disease

In patients suspected of having coronary artery disease (CAD), we compared the diagnostic sensitivity and specificity of exercise testing using ST-segment changes alone and ST-segment changes, angina pectoris, and hemodynamic variables compared to coronary computed tomographic angiography (CTA). Quantitative invasive coronary angiography was the reference method (>50% coronary lumen reduction). A positive exercise test was defined as the development of significant ST-segment changes (> or =1 mV measured 80 ms from the J-point), and the occurrence of one or more of the following criteria: ST-segment changes > or =1 mV measured 80 ms from the J-point, angina pectoris, ventricular arrhythmia (the occurrence of > or =3 premature ventricular beats), and > or =20 mm Hg decrease in systolic blood pressure during the test. Positive results on CTA were defined as a coronary lumen reduction of > or =50%. In 100 patients (61 +/- 9 years old, 50% men, and 29% prevalence of significant CAD), the diagnostic sensitivity and specificity of exercise testing using ST-segment changes was 45% (95% confidence interval 53% to 87%) and 63% (95% confidence interval 61% to 84%), respectively. However, the inclusion of all test variables yielded a sensitivity of 72% (95% confidence interval 53% to 87%) and a specificity of 37% (95% confidence interval 26% to 49%). The diagnostic sensitivity of 97% (95% confidence interval 82% to 100%) and specificity of 80% (95% confidence interval 69% to 89%) for CTA, however, were superior to any of the exercise test analysis strategies. In conclusion, in patients suspected of having CAD, the diagnostic sensitivity of exercise testing significantly improves if all test variables are included compared to using ST-segment changes exclusively. Furthermore, the superior diagnostic performance of CTA for the detection and exclusion of significant CAD might favor CTA as the first-line diagnostic test in patients suspected of having CAD.

Uncommon Congenital and Acquired Aortic Diseases: Role of Multidetector CT Angiography

State-of-the-art multidetector computed tomographic (CT) technology has replaced invasive angiography for evaluation of patients suspected to have aortic disease. Although most aortic disease is associated with atherosclerosis (ie, aneurysms and dissection), the spectrum of aortic disease is vast and includes various congenital and acquired entities. Radiologists should also be familiar with uncommon aortic diseases, which are divided into those that are congenital in origin and acquired disorders, and with their findings at multidetector CT. The first group includes patent ductus arteriosus, aortic hypoplasia, aortic coarctation, interrupted aortic arch, aortopulmonary window, common arterial trunk, supravalvular aortic stenosis, and vascular rings. The acquired disorders include aortic dissection due to extension of a coronary artery dissection, Marfan syndrome, large-vessel vasculitis such as Takayasu arteritis, and mycotic aneurysms. Finally, specific conditions associated with therapeutic maneuvers--such as recoarctation, stent-graft rupture, and endoleaks--can also be assessed with multidetector CT. Multidetector CT is an alternative tool helpful in establishing the primary diagnosis, defining anatomic landmarks and their relationships, and identifying associated cardiovascular anomalies. It is also an adjunct in the evaluation of complications during follow-up.

Three-dimensional CT angiography for preoperative evaluation of patients undergoing hepatic resection using the Glissonean pedicle transection method

Three-dimensional CT angiography for preoperative evaluation of patients undergoing hepatic resection using the Glissonean pedicle transection method

Aorto-iliac angiography as a screening tool in selecting patients for transfemoral aortic valve implantation with the Edwards SAPIEN bioprosthesis

Transcatheter aortic valve replacement (TAVR) is a promising therapeutic option for patients with severe aortic stenosis (AS) considered at too high risk for conventional aortic valve replacement. The balloon-expandable Edwards valve can be implanted using either the transfemoral or transapical routes, depending on arterial ilio-femoral suitability. The aim of the study was to evaluate the usefulness of ilio-femoral angiography as an initial screening tool for TAVR using the transfemoral approach with the Edwards SAPIEN valve. Aortography with bilateral ilio-femoral run-off was assessed in the antero-posterior projection. Minimal arterial diameter, vessel tortuosity and calcification were assessed. Transfemoral implantation was appropriate when the minimal arterial diameter was >7 mm for a 23 mm trans-catheter heart valve (THV) and >8 mm for a 26 mm THV with limited calcifications and tortuosity. Included were 135 patients with severe aortic stenosis undergoing cardiac catheterisation before conventional aortic valve replacement or TAVR. Mean femoral artery diameter was 7.5+/-1.3 mm and mean iliac artery diameter was 9.3+/-2.3 mm. There was no or moderate tortuosity in 72% of them. Calcifications were absent or moderate in 83%. At first sight, the transfemoral route was considered potentially suitable in 71% of patients for a 23 mm THV and 39% of patients for a 26 mm TAVI. In the course of haemodynamic and angiographic evaluation of patients with severe symptomatic aortic stenosis, angiography of the ilio-femoral access can be used as a first screening modality to determine potential candidacy for a transfemoral TAVR using a balloon expandable THV.

Combined use of duplex imaging and magnetic resonance angiography for evaluation of patients with symptomatic ipsilateral high-grade carotid stenosis

Purpose: Advances in cerebral vascular imaging suggest that patients with critical levels of carotid artery stenosis (>70%) who have symptoms can be identified accurately and necessary information about the intracranial and extracranial circulation obtained before surgery without conventional angiography. We have used carotid duplex imaging in combination with magnetic resonance angiography (MRA) to evaluate 20 patients with symptomatic ipsilateral high-grade carotid stenosis.Methods: All patients underwent CT and magnetic resonance imaging brain scans, as well as MRA and conventional arteriography of the cerebral circulation. Magnetic resonance angiograms were obtained with two-dimensional phase contrast and time-of-flight techniques. Phase contrast was used for intracranial vascular imaging and for determining qualitative flow velocities and the direction of blood flow in the circle of Willis. Two-dimensional time of flight was used to assess the carotid bifurcations.Results: Twenty patients with symptoms (six with strokes, 11 with transient ischemic attacks, and three with amaurosis fugax) had duplex evidence of high-grade carotid stenoses. Computed tomographic and magnetic resonance brain scans were positive for cerebral infarction in six patients with clinical strokes. Comparison of MRA with conventional angiography was 91% accurate for high-grade stenoses and occlusions (sensitivity 100% and specificity 90% for stenosis; sensitivity/specificity was 100% for complete occlusion). Comparison of duplex imaging with conventional angiography demonstrated 86% accuracy for detection of severe stenosis or occlusion (sensitivity 94% and specificity 89% for stenosis; sensitivity and specificity were 100% for complete occlusion).Conclusions: This study suggests that combined use of MRA and duplex imaging is accurate for detection and evaluation of high-grade carotid stenoses in patients with symptoms.

Angiographic evaluation of patients with unilateral massive perfusion defects in the lung scan.

Pulmonary embolism is an uncommon cause of a massive unilateral lung scan perfusion defect; other causes may mimic PE clinically. Angiography may, therefore, be essential for accurate diagnosis.

Intravenous radioisotope angiography with computer processing of data.

Four studies are considered to illustrate a technique for intravenous radioisotope angiographic evaluation of patients with cardiac disorders. Although the various pictorial presentations including cinefilm have proven valuable in these studies, there has been the addition of computer processing of data, providing a quantitative approach to be made for better evaluation of the clinical status of patients with cardiac problems.Despite its limitations, this technique for processing of data obtained with a scintillation camera has proven useful. The major limitation is the inherent dead time during which the data in memory are being read onto the magnetic tape (approximately 0.2 seconds). This, together with the data collection time of 0.6 seconds means that data points are obtained at 0.8 second intervals.For the cases presented here, this does not represent a serious problem in interpretation of results. However, for optimal evaluation of cardiac shunts and incompetent cardiac valves, shorter time interval...