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Each year, approximately 30,000 people in the United States suffer an intra-cranial hemorrhage due to aneurysmal rupture. Of those surviving the initial event, up to 40% will go on to have further neurological injury secondary to stroke (delayed cerebral ischemia) caused by constriction of blood vessels (i.e. vasospasm). Previous studies have shown that the medication sildenafil, given intravenously, improves vasospasm, but has an associated degree of hypotension. The degree of hypotension was well within safety thresholds for these patients.
Sildenafil is a medication that strongly inhibits the protein phosphodiesterase-V (PDE-V). The hypothesis for this study is that oral sildenafil will also improve vasospasm, but does not result in as much hypotension. Specifically, the investigators look to show that comparable doses of oral sildenafil produces the same degree of PDE-V inhibition as an intravenous dose while the degree of hypotension is reduced. Additionally, using measurements of cerebral blood flow regulation acquired using transcranial Doppler ultrasound, the investigators look to show that oral sildenafil produces the same degree of improvement in vasospasm and blood flow regulation.
Low dose sildenafil citrate, High dose sildenafil citrate
University of Mississippi Medical Center
University of Mississippi Medical Center
Published on BioPortfolio: 2017-01-24T07:38:22-0500
To demonstrate a dose response for 1 mg, 5 mg and 20 mg TID oral sildenafil for the treatment of subjects with PAH.
Previous studies have shown that expectant management of preeclampsia in the context of extreme prematurity may improve perinatal outcomes. Indeed, it has been estimated that for each addi...
The purpose of this study is to determine whether regular oral use of sildenafil citrate can prevent or attenuate high altitude illnesses.
The purpose of this study is to perform a relative bioavailability study between two formulations of sildenafil citrate.
This is a clinical research study designed to evaluate sildenafil for the treatment of Pulmonary Arterial Hypertension in children, aged 1 to 17 years. The purpose of the study is to asse...
Sildenafil was the first selective drug available on the market as oral therapy for erectile dysfunction (ED). A novel sildenafil orodispersible film (ODF) for ED treatment, containing sildenafil citr...
To study the tocolytic action of nifedipine combined with sildenafil citrate (SC) and if the combination is superior to nifedipine alone in inhibiting threatened preterm labour (PTL).
Regional citrate anticoagulation has been associated with enhanced biocompatibility in hemodialysis, but the optimal dose of citrate remains to be established. Here, we compared parameters related to ...
Sildenafil, a phosphodiesterase 5 (PDE5) inhibitor, is known to increase the intracellular level of cyclic guanosine monophosphate (cGMP), which causes vasodilation. However, the effect of sildenafil ...
Persistent pulmonary hypertension is a serious disease among new-borns. Inhaled nitric oxide is first line of therapy along with extracorporeal membrane oxygenation. Pulmonary vasodilators such as sil...
A PHOSPHODIESTERASE TYPE-5 INHIBITOR; VASODILATOR AGENT and UROLOGICAL AGENT that is used in the treatment of ERECTILE DYSFUNCTION and PRIMARY PULMONARY HYPERTENSION.
The dose amount of poisonous or toxic substance or dose of ionizing radiation required to kill 50% of the tested population.
An enzyme that, in the presence of ATP and COENZYME A, catalyzes the cleavage of citrate to yield acetyl CoA, oxaloacetate, ADP, and ORTHOPHOSPHATE. This reaction represents an important step in fatty acid biosynthesis. This enzyme was formerly listed as EC 220.127.116.11.
A treatment schedule in which the total dose of radiation is divided into large doses.
Enzyme that catalyzes the first step of the tricarboxylic acid cycle (CITRIC ACID CYCLE). It catalyzes the reaction of oxaloacetate and acetyl CoA to form citrate and coenzyme A. This enzyme was formerly listed as EC 18.104.22.168.
Neurology - Central Nervous System (CNS)
Alzheimer's Disease Anesthesia Anxiety Disorders Autism Bipolar Disorders Dementia Epilepsy Multiple Sclerosis (MS) Neurology Pain Parkinson's Disease Sleep Disorders Neurology is the branch of me...
Pharmacy is the science and technique of preparing as well as dispensing drugs and medicines. It is a health profession that links health sciences with chemical sciences and aims to ensure the safe and effective use of pharmaceutical drugs. The scope of...
Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...