TY - JOUR
T1 - Hemostatic changes after early versus late intracoronary magnesium during acute myocardial infarction in swine
AU - Serebruany, Victor L.
AU - Herzog, William R.
AU - Schlossberg, Matthew L.
AU - Edenbaum, Lisa R.
AU - Gurbel, Paul A.
PY - 1996/12/20
Y1 - 1996/12/20
N2 - There has been some debate regarding the benefit of magnesium (Mg) in the treatment of acute myocardial infarction (AMI) because of conflicting results from recent clinical trials. Several different hypotheses have been advanced to explain the cardioprotective properties of Mg, including the influence of the timing of Mg administration during AMI. This experiment was designed to assess the effect of intracoronary Mg on certain hemostatic parameters that are known to change during an AMI. Yorkshire swine underwent thoracotomy and 50 min left anterior descending artety (LAD) occlusion, followed by 3 h of reperfusion. In the early group, 250 mg of MgSO4 was delivered at the onset of reperfusion (n = 6, Mg-early group). In the second group, MgSO4 was given after 1 h of reperfusion (n = 6, Mg-late group). Six animals received saline instead of Mg and served as controls. The dynamics of plasma antithrombin-III(AT-III), protein C, total protein S, fibronectin, endothelin-1 (ET-1), as well as the stable metabolites of thromboxane (TXB2) and prostacyclin (6-keto-PGF(1a)) were determined at baseline, twice during occlusion, and three times during reperfusion. Mg given at reperfusion onset was associated with a diminished ET-1 (32.9%), decreased fibronectin level (21.7-25.2%), and increased protein C concentrations (31.9-52.3%) when compared with both the control and late Mg group. In summary, intracoronary Mg administered at the onset of reperfusion favorably influenced hemostasis in swine. The beneficial effects of early Mg supplementation in an expanding array of clinical conditions, including AMI, may be directly related to the improved hemostatic profile in such patients.
AB - There has been some debate regarding the benefit of magnesium (Mg) in the treatment of acute myocardial infarction (AMI) because of conflicting results from recent clinical trials. Several different hypotheses have been advanced to explain the cardioprotective properties of Mg, including the influence of the timing of Mg administration during AMI. This experiment was designed to assess the effect of intracoronary Mg on certain hemostatic parameters that are known to change during an AMI. Yorkshire swine underwent thoracotomy and 50 min left anterior descending artety (LAD) occlusion, followed by 3 h of reperfusion. In the early group, 250 mg of MgSO4 was delivered at the onset of reperfusion (n = 6, Mg-early group). In the second group, MgSO4 was given after 1 h of reperfusion (n = 6, Mg-late group). Six animals received saline instead of Mg and served as controls. The dynamics of plasma antithrombin-III(AT-III), protein C, total protein S, fibronectin, endothelin-1 (ET-1), as well as the stable metabolites of thromboxane (TXB2) and prostacyclin (6-keto-PGF(1a)) were determined at baseline, twice during occlusion, and three times during reperfusion. Mg given at reperfusion onset was associated with a diminished ET-1 (32.9%), decreased fibronectin level (21.7-25.2%), and increased protein C concentrations (31.9-52.3%) when compared with both the control and late Mg group. In summary, intracoronary Mg administered at the onset of reperfusion favorably influenced hemostasis in swine. The beneficial effects of early Mg supplementation in an expanding array of clinical conditions, including AMI, may be directly related to the improved hemostatic profile in such patients.
KW - Animal model
KW - Hemostasis
KW - Magnesium
KW - Myocardial infarction
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U2 - 10.1097/00005344-199612000-00012
DO - 10.1097/00005344-199612000-00012
M3 - Article
C2 - 8961080
AN - SCOPUS:0029849244
VL - 28
SP - 817
EP - 823
JO - Journal of Cardiovascular Pharmacology
JF - Journal of Cardiovascular Pharmacology
SN - 0160-2446
IS - 6
ER -