| 词汇 | vasoconstriction |
| 释义 | vasoconstriction noun[ U ] biology specializeduk /ˌveɪzəʊkənˈstrɪkʃən/ us /ˌveɪzoʊkənˈstrɪkʃən/ the situation of blood vessels (= the tubes that carry blood) becoming narrower血管收缩 The circulatory system & blood ABO accessory pathway adventitia adventitial ANA auricle bicuspid valve femoral artery gamma globulin glomus granulocyte haematogenous haemic phagocyte portal system precava pulmonary artery pulmonary vein pulmonic tricuspid valve Examples of vasoconstrictionvasoconstriction It is supposed that these improvements of clinical symptoms are based on inhibition of vasoconstriction and platelet aggregation in pulmonary circulation. Reduced invasion will leave the spiral arteries vasoreactive, and thus more likely to undergo spontaneous transient vasoconstriction. Activation of the extrinsic coagulation pathway causes additional adherence of platelets and even greater vasoconstriction. Traditionally phenylephrine was reserved as a second-line drug for obstetrics because of concern about potential uteroplacental vasoconstriction. Elevated high-density lipoprotein levels ameliorate abnormal vasoconstriction in early atherosclerosis. When the core temperature falls, the hypothalamus increases core heat production and causes vasoconstriction which minimizes heat transfer to the skin. In particular, these studies showed that large doses of vasopressors caused vasoconstriction in the uteroplacental circulation which could result in fetal hypoxia. First, ongoing perfusion of the placenta may cause continuous stimulation of production of vasoactive substances, which will tend to increase placental vasoconstriction. Evidence from recent clinical trials suggests that concerns about uteroplacental vasoconstriction caused by phenylephrine are unfounded and this is the authors' drug of choice. Nitric oxide alone, at least in this group of patients, does not unmask all the reversible vasoconstriction. The vasoconstriction caused by ergometrine involves mainly capacitance vessels, leading to increase in central venous pressure and blood pressure. This, however, results in generalized vasoconstriction, sludging of blood cells in the microcirculation, and poor perfusion of the tissues. Vasoconstriction follows, in response to factors released by these cells. This suggests that severe muscular hypertrophy without occlusive disease may be sufficient to produce irreversible pulmonary hypertension, possibly due to marked vasoconstriction. It is also involved in regulation of cell adhesion, vasoconstriction at sites of vessel-wall injury and stimulation of platelet aggregation. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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