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- W2031245310 abstract "Intracoronary nitroglycerin (NTG) increases coronary blood flow and NTG inhibits thromboxane (Tx) A2 production and release. However, whether an alteration in TxA2 is the mechanism by which NTG increases coronary blood flow is not known. Coronary sinus (CS) blood flow (BF) (by thermodilution) and the concentration of TxB2 (the stable metabolite of TxA2) in CS blood were measured in 23 patients (16 men and 7 women, aged 26 to 65 years) with coronary artery disease before, during and after injection of normal saline solution (n = 5, control subjects) or NTG, 100 micrograms (n = 18), into the left coronary artery. In the 5 control subjects, saline solution caused no change in CSBF or the concentration of TxB2 in CS blood. Ten of the 18 patients to whom NTG was given had received no cyclooxygenase inhibitors for 10 days. In these patients, NTG caused a marked increase in CSBF (from 112 +/- 64 to 152 +/- 70 ml/min, p less than 0.01) but no consistent change in the concentration of TxB2 in CS blood (141 +/- 132 to 160 +/- 155 pg/ml, difference not significant [NS]). The remaining 8 patients to whom NTG was given received aspirin before the study. In these patients, NTG caused a marked increase in CSBF (from 111 +/- 39 to 180 +/- 63 ml/min, p less than 0.01), even though the concentration of TxB2 in CS blood (8 +/- 10 to 6 +/- 6 pg/ml, NS) was lower (p less than 0.05) than that in control subjects and patients not receiving aspirin.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2031245310 date "1984-11-01" @default.
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- W2031245310 title "Mechanism of nitroglycerin-induced coronary dilatation: Lack of relation to intracoronary thromboxane concentrations" @default.
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- W2031245310 doi "https://doi.org/10.1016/s0002-9149(84)80127-7" @default.
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