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Effect of indomethacin on pulmonary vasomotor response in patients with mitral stenosis
Abstract:
In 10 patients with mitral stenosis, ingestion of 125 mg indomethacin over a 24-h period had no effect on the elevated pressure in pulmonary artery. It did, however, in all patients, slightly potentiate a fall in pulmonary pressure induced by breathing of 100% oxygen. The results do not suggest that a prostaglandin mechanism is involved in chronic pulmonary vasoconstriction or that this mechanism is responsible for acute vasodilatation of the pulmonary bed induced by oxygen inhalation.
Insights
Indomethacin did not affect pulmonary artery pressure in mitral stenosis patients. However, it enhanced oxygen-induced pulmonary vasodilation, suggesting prostaglandins are not key in chronic pulmonary vasoconstriction.
Area of Science:
- Cardiology
- Pulmonary Medicine
- Pharmacology
Background:
- Mitral stenosis often leads to elevated pulmonary artery pressure.
- Prostaglandins are implicated in regulating vascular tone.
- The role of prostaglandins in oxygen-induced pulmonary vasodilation is unclear.
Purpose of the Study:
- To investigate the effect of indomethacin, a prostaglandin inhibitor, on pulmonary artery pressure in patients with mitral stenosis.
- To determine if indomethacin influences the pulmonary vasodilatory response to oxygen inhalation.
Main Methods:
- Ten patients with mitral stenosis were administered 125 mg of indomethacin over 24 hours.
- Pulmonary artery pressure was monitored before and after indomethacin administration.
- The effect of 100% oxygen breathing on pulmonary pressure was assessed with and without indomethacin.
Main Results:
- Indomethacin had no significant effect on the elevated pulmonary artery pressure in mitral stenosis patients.
- Indomethacin slightly potentiated the reduction in pulmonary pressure observed during 100% oxygen breathing.
- No evidence suggests prostaglandins mediate chronic pulmonary vasoconstriction in this condition.
Conclusions:
- Prostaglandins do not appear to be involved in chronic pulmonary vasoconstriction associated with mitral stenosis.
- The prostaglandin system is unlikely to be responsible for the acute pulmonary vasodilation induced by oxygen inhalation.