Active clinical trials for "Hypertension"

The investigators want to test the hypothesis that patients with chronic renal disease have a poorer ability to preserve water after being thirsty and a poorer ability to excrete water after a load of fluid. They presume that these abilities become poorer when renal insufficiency progresses. The investigators further hypothesize that patients with hypertension also have a decreased ability to concentrate and dilute urine.

Damage to very small blood vessels is a consequence, but can also precede high blood pressure. Such damage, measured by disturbances in the vessels in the retina (back of the eye) is a strong predictor of heart disease and stroke. South Asian people have one of the highest rates of hypertension in the world (30% in adults). In Pakistan, this is usually severe, undetected and untreated. The Wellcome Trust has already funded a study of blood pressure control in adults and children in this population. We propose a substudy, taking photographs of the retina and making measurements of the vessels, to determine whether such blood pressure related changes occur at an early age in young children with a family history of high blood pressure compared to those without, whether such changes predict an increase in blood pressure over time, and whether, in adults, such changes can be reversed by blood pressure treatment. The hypothesis of our study is: young offspring of South Asian people with hypertension have a disturbed microcirculation, as assessed by abnormalities of retinal vessels, compared to offspring of normotensive parents. Our 2nd hypothesis is: Abnormal retinal vascular geometry will improve proportionately to achieved reductions in BP.

To investigate the mechanisms of white coat hypertension and study it further as a risk factor for heart damage.

To investigate familial patterns of hypertension and related cardiovascular (CV) risk factors in the United States and Nigeria.

To examine a school-based population of children for maturational changes in blood pressure and cardiac structures.

The overall objective of this proposal is to examine the contribution of changes in total body fat, enhancement in insulin-mediated vasodilatation and enhancement in endothelium-derived nitric oxide production to the improvements in metabolic insulin action. In addition, the study will track whether these improvements are related to changes in blood pressure.

This study will investigate congenital or developmental eye abnormalities that affect the iris, cornea and lens, and are usually accompanied by elevated pressure within the eye. These disorders can cause vision loss, and the increased eye pressure can lead to glaucoma, a condition that may also cause loss of eyesight. Patients with eye anterior chamber eye disease, such as Axenfeld's syndrome, Rieger's anomaly, Peter's anomaly, iridocorneal endothelial syndrome, megalocornea, ocular hypertension, and others, are eligible for this study. Participants will have a medical examination, family history, and comprehensive eye examination. Tests and procedures may include photographs of the cornea, iris, and the structure through which fluid that normally circulates behind the cornea drains out of the eye. Some patients may undergo indentation tonography to measure how easily this fluid drains. In this procedure, the patient lies on an examination table and both eyes are numbed with eye drops. A small instrument (tonometer) is placed on the surface of one eye, and with the other eye, the patient looks at an overhead light. Other tests may include photographs of the back of the eye and ultrasound imaging of the structures of the eye. A blood sample may be drawn to study the genetic disorder responsible for the disease. Patients will have follow-up examinations every 6 months for the duration of the study. Medical or surgical therapy will be recommended, as appropriate, for patients who develop elevated eye pressure or vision loss.

Blood pressure reduction and control are associated with reduced risk of stroke and cardiovascular disease. There is evidence that ambulatory blood pressure monitoring (ABPM) results more accurately reflect the risk of cardiovascular events than do office measurements of blood pressure. New international guidelines recognize the importance of ABPM which has an important and growing role in the diagnosis and in guiding antihypertensive therapy. In 2011 in the United Kingdom, the National Institute for Health and Care Excellence (NICE) recommended that ABPM be performed on all patients with suspected hypertension to confirm the diagnosis and reduce unnecessary treatment in people who do not have true hypertension. The aim of this observational study is to describe the utility of ABPM generally and specifically in the management of hypertension by Cardiologists in the Algerian context.

This is an observational, multicenter, single-day, Phase 2 study. This study will include a 14-day Screening Period and Study Day 1 clinic visit. Participants will be required to perform an activity to induce symptoms of PAH, and participants' severity of self-reported symptoms of PAH will be measured from pre-activity, immediately after the activity, and through the 30-minute recovery. Participants will be asked about their PAH symptoms using 3 PGI-S questions that address their overall PAH symptoms, shortness of breath, and physical fatigue.

The Tunisian Society of Cardiology and Cardiovascular Surgery (STCCCV) proposes to coordinate a national, observational, cross-sectional and multicenter survey carried out during one month. The main objective of the survey is to describe the blood pressure and cardiovascular risk profile of the hypertensive patient in Tunisia. This survey will allow us to have a generalized and updated view of the tunisian hypertensive patient in order to optimize treatment and to know the degree of adherence of practitioners to international recommendations in the care of the hypertension in Tunisia.