What question did this study set out to answer?

To investigate the mechanisms behind impaired endothelium-dependent relaxation in chronic obstructive lung disease patients.

Impairment of pulmonary‐artery endothelium‐dependent relaxation in chronic obstructive lung disease is not due to dysfunction of endothelial cell membrane receptors nor to l‐arginine deficiency

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Randomized trial reveals impaired endothelium-dependent relaxation in COLD patients, indicating a biosynthesis pathway issue.

To investigate the mechanisms behind impaired endothelium-dependent relaxation in chronic obstructive lung disease patients.
Compared isolated pulmonary artery rings from 12 COLD patients and 8 controls using various vasodilators.
Evaluated responses to endothelium-dependent and independent agents after pre-contraction with phenylephrine.
Assessed the effects of L-NMMA and L-arginine on relaxation responses.
Endothelium-dependent relaxation was significantly reduced in COLD patients compared to controls with ACh (37.8% vs 73.4%), ADP (38.4% vs 80%), and A23187 (35.8% vs 87%).
Relaxation with SNP was greater in COLD patients (99.4% vs 90.3%) and contractile response to PE was also higher (1.91g vs 1.33g).
L-arginine pretreatment alone did not restore impaired relaxation in COLD patients, suggesting an issue in NO biosynthesis.

Dinh‐Xuan et al. (1993) studied this question.

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