TY - JOUR
T1 - Sodium nitroprusside exacerbates myocardial ischemia-reperfusion injury
AU - Cope, Jeffrey T.
AU - Banks, David
AU - Laubach, Victor E.
AU - Binns, Oliver A.R.
AU - King, R. Christopher
AU - Richardson, R. Mark
AU - Shockey, Kimberly S.
AU - Tribble, Curtis G.
AU - Kron, Irving L.
N1 - Funding Information:
This work was supported by a National Research Service Award (Fellowship No. 1 F32 HL09065-01A2) granted by the National Heart, Lung, and Blood Institute of the National Institutes of Health.
PY - 1997/12
Y1 - 1997/12
N2 - Background. The role of nitric oxide in myocardial ischemia-reperfusion is controversial. Although many studies claim that nitric oxide ameliorates reperfusion injury, others suggest that it exacerbates such injury, possibly through peroxynitrite production. These discordant results may be attributable to a dose-dependent phenomenon. Methods. Isolated rabbit hearts sustained sequential periods of blood perfusion (20 minutes), warm ischemia (30 minutes), and reperfusion (20 minutes). During reperfusion, four groups underwent intracoronary infusion of saline solution (n = 6), or the nitric oxide donor sodium nitroprusside (100 nm/min [SNP100, n = 6], 1 nmol · L- 1/min-1 [SNP1, n = 6], or 0.01 nmol · L-1 · min-1 [SNP0.01]). Left ventricular-developed pressure and oxygen consumption were measured after preischemic perfusion and reperfusion. Levels of myocardial nitrotyrosine, a marker for peroxynitrite, were measured after reperfusion with an immunoradiochemical assay. Results. Postischemic-developed pressure and myocardial oxygen consumption were significantly higher in the saline group than all nitroprusside-reperfused groups (p < 0.01 for both parameters). However, there were no differences in either parameter between SNP100, SNP1, or SNP0.01. Nitrotyrosine levels were similar among the four groups (p = 0.43). Conclusions. Nitroprusside exacerbates myocardial ischemia-reperfusion injury over a wide range of doses, although the mechanism does not appear to be mediated by peroxynitrite.
AB - Background. The role of nitric oxide in myocardial ischemia-reperfusion is controversial. Although many studies claim that nitric oxide ameliorates reperfusion injury, others suggest that it exacerbates such injury, possibly through peroxynitrite production. These discordant results may be attributable to a dose-dependent phenomenon. Methods. Isolated rabbit hearts sustained sequential periods of blood perfusion (20 minutes), warm ischemia (30 minutes), and reperfusion (20 minutes). During reperfusion, four groups underwent intracoronary infusion of saline solution (n = 6), or the nitric oxide donor sodium nitroprusside (100 nm/min [SNP100, n = 6], 1 nmol · L- 1/min-1 [SNP1, n = 6], or 0.01 nmol · L-1 · min-1 [SNP0.01]). Left ventricular-developed pressure and oxygen consumption were measured after preischemic perfusion and reperfusion. Levels of myocardial nitrotyrosine, a marker for peroxynitrite, were measured after reperfusion with an immunoradiochemical assay. Results. Postischemic-developed pressure and myocardial oxygen consumption were significantly higher in the saline group than all nitroprusside-reperfused groups (p < 0.01 for both parameters). However, there were no differences in either parameter between SNP100, SNP1, or SNP0.01. Nitrotyrosine levels were similar among the four groups (p = 0.43). Conclusions. Nitroprusside exacerbates myocardial ischemia-reperfusion injury over a wide range of doses, although the mechanism does not appear to be mediated by peroxynitrite.
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U2 - 10.1016/S0003-4975(97)01089-8
DO - 10.1016/S0003-4975(97)01089-8
M3 - Article
C2 - 9436551
AN - SCOPUS:0031431145
SN - 0003-4975
VL - 64
SP - 1656
EP - 1660
JO - Annals of Thoracic Surgery
JF - Annals of Thoracic Surgery
IS - 6
ER -