Syncope or near-syncope is a not uncommon effect of gravitational or other stresses and it occurs when cerebral blood flow falls to below about half the normal value. It is not necessarily abnormal, and individuals who are usually asymptomatic show the same reaction if a stress is sufficiently ...
These differences are apparent biochemically, as well as in neurophysiological testing, with near normal plasma norephrine in MSA but very low levels in PAF. These differences are also reflected in the response patients have to drugs that interact with the autonomic nervous system. For example, ...
Patients with aortic stenosis (AS) have an increased prevalence of coronary risk factors, coronary artery disease (CAD), and other atherosclerotic vascular diseases. Angina pectoris, syncope or near syncope, and congestive heart failure are the three classic manifestations of severe AS. Prolonged durat...
In chronic respiratory alkalosis, the PaCO2 level is below the lower limit of normal, but the pH level is relatively normal or near normal due to compensatory mechanisms. Respiratory alkalosis is the most common acid-base abnormality observed in patients who are critically ill. It is associated ...
This is comparable to the initiation phase in atherogenesis, where endothelial cell (EC) activation occurs in areas of disturbed shear stress, such as near arterial bifurcations, which permits circulating ApoB-containing lipoprotein and immune cells to enter the intimal space [81]. Stimulated ECs ca...
Syncope should always be considered as a clinical sign and not as a disease in itself. Depending on the underlying cause, it can impair the patient's quality of life, indicate a near sudden death, or have a benign course, and may even disappear without any treatment. Due to the number ...
Patients with aortic stenosis (AS) have an increased prevalence of coronary risk factors, coronary artery disease (CAD), and other atherosclerotic vascular diseases. Angina pectoris, syncope or near syncope, and congestive heart failure are the three classic manifestations of severe AS. Prolonged ...