INTRODUCTION Hymenoptera venoms contain thrombogenic substances that might be responsible for cardiovascular events independent of anaphylactic reactions. CASE PRESENTATION We report a 55-year-old man who experienced an acute ST-elevation myocardial infarction after wasp sting. The patient presented without signs of anaphylaxis or shock. The coronary angiography showed an acute stent thrombos...

The major regulatory factors in the mesenteric circulation include general hemodynamic forces, the autonomic nervous system, circulating vasoactive substances, tissue metabolites and intrinsic characteristics of vascular smooth muscle. During mesenteric ischemic states smooth muscle spasm elevates resistance to blood flow and aggravates intestinal tissue hypoxia leading to mucosal necrosis. Clo...

This review analysed the literature of the period 2006 2015 on the nervous and humoral control of choroidal (including the vascularization of iris and ciliary bodies) and conjunctival vascular tone. Articles referring exclusively to pathological eye and to retinal vasculature were excluded. Anatomically, choroidal and conjunctival vascular territories are two distinct territories with extensive...

In 1980, Furchgott and Zawadskil first showed that an intact endothelium must be present for acetylcholine to relax isolated vessels. This was subsequently found to be true for many other vasoactive substances.2-6 As a result of work from several laboratories, this response has been shown to occur because the endothelium releases a shortlived nonprostanoid compound or family of compounds collec...

In the dog foreleg acute increase and decrease of hydrogen ion concentration is associated with active small vessel dilatation and constriction, respectively, through some direct effect upon vascular smooth muscle. These small vessel resistance changes do not affect total resistance in the intact leg because of directionally opposite active changes in artery resistance. The latter response appe...

Isolated unilateral pleural effusion is uncommon presentation of ovarian hyperstimulation syndrome. The pathogenesis of this syndrome involves an increased permeability of ovarian capillaries and mesothelial vessels triggered by the release of vasoactive substances by the ovaries under human chorionic gonadotropin stimulation. Physicians should consider this potentially life-threatening diagnos...

Accumulating evidence suggests that stellate cells are involved in the regulation of the liver microcirculation and portal hypertension. Activated hepatic stellate cells have the necessary machinery to contract or relax in response to a number of vasoactive substances. Because stellate cells play a role in both fibrosis and portal hypertension, they are currently regarded as therapeutic targets...