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NCT06797752
Surges in the sympathetic nervous system occur at the ictus of a variety of neurological critical illnesses including intracranial hemorrhage and ischemic stroke. It is hypothesized that these exaggerated increases in sympathetic nervous activity produce maladaptations that promote secondary brain injury. One of these possible mechanisms include diffuse vasospasm that cause cerebral ischemia. Hence, methods to abrogate the sympathetic nervous system in this context are under active investigation. One possible method is the regional anesthesia technique of the stellate ganglion nerve block, which is ordinarily used for complex regional pain syndrome, but has been shown to reduce cerebral sympathetic activity and reduces vasospasm in patients with subarachnoid hemorrhage. However, its effect on the microcirculation is not clear. Hence, we propose to study patients receiving the stellate ganglion nerve block as part of their standard medical care and to image their retinal microcirculation before and after the procedure using Optical Coherence Tomography Angiography (OCTA).
NCT06091722
To explore an optimized scan technique for the detection of lid margin vasculature
NCT05418374
Continuous spinal anesthesia (CSA) is an anesthetic technique that offers several clinical advantages for anesthesia and analgesia in elderly patients. The level of sensory blockade can be titrated to the desired dermatomal level with great precision with intrathecal (IT) catheters, allowing better control of the hemodynamic consequences of sympathetic blockade associated with spinal anesthesia compared to epidural or single shot spinal techniques. Better control of hemodynamics maybe advantageous in patients with cardiac disease in whom administration of lower doses of local anesthetics is advantageous. Greater numbers of patients are presenting for surgery with aging-related pre-existing conditions, which places them at greater risk of an adverse outcome, such as cardiac or pulmonary disease or diabetes mellitus. CSA allows incremental dosing of an intrathecal local anesthetic providing fewer hemodynamic alterations. While spinal anesthesia is widely used anesthetic technique in lower limb surgery in the elderly, it induces more hemodynamic instability due to high blockage effect which largely limits the use of conventional dose of spinal anesthesia in high risk elderly patients
NCT05190965
Diabetic retinopathy (DR) is the leading cause of decreased vision in working age people. Patients with DR can develop macular edema and proliferative retinopathy which are major causes of visual impairment \[1\]. The potential of OCTA regarding diagnosis and follow up of DR has been shown in previous studies \[2-4\]. At present fluorescein angiography (FA) represents the gold standard in the diagnosis and staging of DR \[5\]. With FA vascular lesions like micro aneurysms (MAs), the size of areas of non-perfusion and of the foveal avascular zone (FAZ) and retinal neovascularisations can be reliably identified \[6\]. Al-though the capabilities of FA are well known, its use also contains some risks related to the intravenous injection of the dye, which can cause nausea, vomiting and allergic re actions and even anaphylactic shock \[7\]. Besides that, it also requires time and trained personnel \[8\]. Image acquisition by OCTA in contrast is not as time consuming and can be performed without taking any risks. Additionally, it provides a 3 dimensional cross sectional view of the retinal and choroidal layers with micro meter depth resolution, providing depth selective information of the retinal vasculature. This facilitates accurate diagnosis and follow up of retinal vascular diseases since significant insights into both morphology and perfusion status can be obtained simultaneously. Although various artifacts appear in OCTA images, a qualitative assessment is mostly possible \[9\].Early changes to be seen in OCTA in patients with non-proliferative DR are vascular remodelling bordering the FAZ, vascular tortuosity, narrowing of capillary lumen and capillary dilatation. These changes cannot be seen in the same manner in FA \[10\].In this study we investigated the size of the FAZ and the count of MAs in patients with DR.
NCT01063595
The primary objective of the study was to compare the efficacy of Octaplas LG with Octaplas SD in terms of recovery of coagulation factors and other haemostatic parameters. The secondary objective of the study was to compare the safety and tolerability of Octaplas LG with Octaplas SD in terms of haematological and clinical chemistry parameters and adverse event monitoring.
NCT01331356
The main objective is to evaluate the analgesic efficacy of botulinum toxin type A in refractory chronic proctalgia one month after a bilateral injection of 50 units of Botox ® in the ganglion Impar (total dose = 100 units)