Arterial Properties of Thoracic Aorta Disease (ao_diss)
Recruitment status was: Recruiting
A dissecting or intramural haematoma of the thoracic aorta (AH) is a haemorrhage that dissects the aortic wall. An entry point is detected at an intimal tear, ulcer or plaque rupture via imaging in almost 50% of cases. AH occurs in older patients than those with AD and develops on atheromatous lesions with parietal ulcers, most often in cases of poorly managed, pre-existing hypertension (HTN). Type A AHs, which affect the ascending aorta, frequently progress towards an AD with a high risk of mortality, and represent a surgical indication.
Patients who have presented AD or AH, whether they have been operated or not, must undergo prolonged monitoring. This involves both clinical and radiological checks to ensure that blood pressure is properly monitored, that the parietal lesions have receded and that there are no complications.
HTN is a recognized risk factor for the onset of AD and systolic blood pressure must be brought down to between 100 and 120 mmHg perioperatively. Furthermore, HTN is also a risk factor for the rupture of unoperated type B AD. Despite this, only two studies have looked at BP management in AD patients. The first, carried out among chronic type A or B AD patients revealed that closer monitoring of blood pressure levels at home led to a better long-term prognosis. Another study revealed a 60% prevalence of non-managed clinical HTN among 40 chronic AD patients.
Whilst frequent, regular aortic wall monitoring via imaging methods (CT or MRI) is recommended after thoracic AD surgery, there is no precise recommendation as to the method of BP monitoring in very high-risk patients. A BP level of 135/80 mmHg has been suggested as a maximum limit for patients having been operated for AD. In order to achieve this, antihypertensives of several therapeutic classes must be used, with beta-blockers as a priority. The same can be said for AH, as it has been demonstrated that the absence of beta-blocker treatment is a predictive factor for poor progress.
Increased aortic stiffness can cause increased systolic blood pressure and is recognized as an independent cardiovascular risk factor. This stiffness can be detected by measuring the carotid-to-femoral pulse wave velocity (PWV). No study has as yet focused on assessing aortic stiffness in patients who have undergone AD or AH surgery.
Obstructive sleep apnea syndrome (OSAS) in thoracic AD patients is highly prevalent, and respiratory events that occur are more severe. This has prompted some to suggest that systematic detection of OSAS after AD should be carried out. No findings have yet been published about patients who have undergone AH surgery.
|Blood Pressure||Procedure: Ambulatory blood pressure monitoring (to evaluate the level of blood pressure)||Phase 3|
|Study Design:||Observational Model: Case-Only
Time Perspective: Prospective
|Official Title:||Blood Pressure Control and Arterial Properties After Surgical Treatment of Type A Thoracic Aortic Dissection or Haematoma|
- Ambulatory blood pressure monitoring [ Time Frame: the same day as inclusion ]
- Aortic stiffness, Aortic diameters [ Time Frame: the same day as inclusion ]
- polysomnography to research Sleep apnea [ Time Frame: within 2 months ]
Biospecimen Retention: Samples Without DNA
|Study Start Date:||May 2008|
|Estimated Study Completion Date:||June 2010|
|Estimated Primary Completion Date:||June 2010 (Final data collection date for primary outcome measure)|
Procedure: Ambulatory blood pressure monitoring (to evaluate the level of blood pressure)
- Ambulatory blood pressure monitoring (to evaluate the level of blood pressure)
- Blood pressure
- Obstructive sleep apnea syndrome (OSAS)
- Carotid-to-femoral pulse wave velocity (PWV)
- Biological parameters
- To evaluate the level of blood pressure control using ambulatory blood pressure monitoring in patients who have undergone surgery for a type A thoracic AD or AH.
- To study aortic stiffness within this patient population and determine its predictive parameters.
- To determine the prevalence of OSAS among this patient population and study the relationship between respiratory data and blood pressure values.
- To determine the respective roles of blood pressure level, aortic stiffness, and respiratory and biological parameters upon the postoperative aortic diameters of patients who have undergone surgery for type A thoracic AD or AH.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01068691
|Contact: BAGUET Jean-Philippe, MD, PhD||(33+) 476768480||JPBaguet@chu-grenoble.fr|
|Principal Investigator: BAGUET JB Jean-Philippe, Pr|
|Sub-Investigator: CHAVANON OC Olivier, Pr|
|Sub-Investigator: PEPIN JP Jean-Louis, Pr|
|Sub-Investigator: THONY FT Frederic, Dr|
|Sub-Investigator: BARONE ROCHETTE GB Gilles, Dr|
|Principal Investigator:||jean-philippe baguet, Pr||University Hospital, Grenoble|