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Endothelial nitric oxide synthase is essential for postpneumonectomy compensatory vasodilation
Thomas S Maxey1, Lucas G Fernandez, T Brett Reece
1Department of Surgery, University of South Florida, Tampa, Florida, USA.
The Annals of Thoracic Surgery
|March 28, 2006
Summary
Endothelial nitric oxide synthase (eNOS) is crucial for lung blood vessel dilation after pneumonectomy. Mice lacking eNOS experienced prolonged pulmonary hypertension, which was improved with inhaled nitric oxide therapy.
Area of Science:
- Cardiovascular Physiology
- Pulmonary Hypertension Research
- Surgical Recovery Science
Background:
- Compensatory vasodilation of remaining lung vasculature is critical post-pneumonectomy.
- Endothelial nitric oxide synthase (eNOS) is investigated for its role in this compensatory mechanism.
Purpose of the Study:
- To determine if eNOS is essential for compensatory vasodilation following pneumonectomy.
- To assess the impact of eNOS deficiency on pulmonary hemodynamics after lung removal.
Main Methods:
- Adult wild-type and eNOS knockout mice underwent left pneumonectomy.
- Right ventricular pressure (RVP) was measured at various time points post-surgery.
- Right ventricular hypertrophy was assessed; some groups received inhaled nitric oxide (iNO).
Main Results:
- eNOS knockout mice exhibited higher preoperative RVP and significantly elevated RVP post-pneumonectomy compared to wild-type.
- Pulmonary hypertension was transient in wild-type but persistent in eNOS knockout mice.
- Inhaled nitric oxide (iNO) normalized RVP in eNOS knockout mice but had no effect in wild-type.
Conclusions:
- Pneumonectomy induces transient pulmonary hypertension, typically resolving within 3 days.
- eNOS is essential for the compensatory vasodilation required to manage increased blood volume post-pneumonectomy.
- Targeting eNOS or nitric oxide pathways may be beneficial for patients experiencing pulmonary hypertension after pneumonectomy.