Summary
The alteration in hypoxic pulmonary vasoconstriction (HPV) induced by cigarette smoking was studied in Wistar rats, piglets and in humans. The percentage change of pulmonary vascular resistance (δPVR%) and the amplitude of the systolic wave in impedance pneumorheogram (δH%) were used to estimate the strength of HPV. It was observed that immediately after acute cigarette smoking, HPV in rats increased (δPVR% from 55,0 ±15.6% to 102.3 ±12.4%), which is mainly mediated by leukotrienes (LTs); whereas HPV in piglets decreased (δPVR% from 65.2 + 12.5% to 55.9 ±9.8%), which is mainly mediated by β-adrenergic receptors, and HPV in humans also increased (δH% from 20.6±2.6% to 31.1 ±4.1%), in which prostaglandins and leukotrienes may play the role of mediators. However, after one-month cigarette smoking, the HPV in rats fell significantly (δPVR% 11.4±1.6%). An increase in synthesis of vasodilative prostaglandins and a decrease in leukotrienes synthesis may be the contributing factors to this alteration in HPV.
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Di-xun, W., Xian-rong, J., Wei-han, W. et al. Effect of cigarette smoking on hypoxic pulmonary vasoconstriction and its relation to animal species and period of smoking. Journal of Tongji Medical University 12, 75–79 (1992). https://doi.org/10.1007/BF02887784
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DOI: https://doi.org/10.1007/BF02887784