Active clinical trials for "Aneurysm"

Seldinger technique is a minimally invasive technique in which the practitioner accesses the target vessel with a small bore needle, then dilates to the size required for the catheter. Contrarily, modified Seldinger technique(guiding sheath-over-the-needle technique) use needle that is covered with guiding sheath. Both technique is widely used in central venous catheterization, however, few researches have been investigated to compare success rate or complications of both methods.

The purpose of this study is to determine whether Sodium Fluoride imaging (using Positron Emission Tomography-Computed Tomography - PET-CT) is able to help predict the rate of abdominal aortic aneurysm expansion.

This study will be a cross-sectional survey of interobserver variability associated with contrast enhanced ultrasound (CEUS) to detect endoleaks using computed tomographic angiography (CTA) as the practice standard. The investigators will enroll 40 consecutive patients undergoing endovascular abdominal aortic aneurysm repair (EVAR). At the first follow-up visit after the procedure, participants will undergo two abdominal ultrasound examinations with and without contrast, and one CTA. Analyses will be conducted to examine interobserver variability in the detection and characterization of endoleaks using contrast-enhanced ultrasound (CEUS). Other endpoints include examination of sensitivity and specificity of CEUS compared to CTA, and characterization of the number and types of endoleaks detected.

Cerebral vasospasm is a devastating complication of subarachnoid hemorrhage after cerebral aneurysm rupture leading to cerebral ischemia and potentially cerebral infarction. The current gold standard diagnostic imaging study for cerebral vasospasm is catheter cerebral angiography, an invasive diagnostic procedure carrying a complication rate of 1-2% per procedure. Computed tomographic perfusion imaging (CTP) and computed tomographic angiography (CTA) are noninvasive diagnostic imaging studies frequently utilized in the evaluation of embolic and thrombotic cerebral infarct. The investigators hypothesize that CTP and CTA may be utilized as screening tools for cerebral vasospasm following aneurysmal subarachnoid hemorrhage requiring treatment and provide prognostic information.

Post Marketing Surveillance of the Conformable GORE® TAG® Thoracic Endoprosthesis

This extended investigation is to provide continued physician access to the device and collect confirmatory safety and effectiveness data.

Patients scheduled for Thoracic Endovascular Aortic Repair (TEVAR) surgery will have transthoracic echocardiography evaluation of left ventricle diastolic function during the perioperative period.

Few data exist on gender-related differences in clinical features, management, and outcomes of acute aortic dissection (AAD) in China. Accordingly, we enrolled 2015 patients with AAD from 15 hospitals in China to access differences in clinical features, management and outcomes between men and women. in this study, our results provided new insights into gender-related differences in clinical features, management and outcomes in the Chinese patients with AAD. Important implications may be helpful to improve diagnostic and therapeutic outcomes.

The Nellix Endovascular Sealing Prosthesis (EVAS) endoprosthesis is a new device aimed at prophylactic treatment of abdominal aortic aneurysms. In regular follow up conventional CT-imaging is used for surveillance. In this study dynamic CT imaging in patients pre- and post-operative will be assessed for device changes and anatomical variances.

Multicenter retrospective CT follow up after aortic aneurysm repair using Nellix Endoprosthesis.