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result sql = The interaction of vasoactive substances during exercise modulates platelet aggregation in hypertension and coronary artery disease.
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result sql = BACKGROUND : Acute vigorous exercise, associated with increased release of plasma catecholamines, transiently increases the risk of primary cardiac arrest. We tested the effect of acute submaximal exercise on vasoactive substances and their combined result on platelet function.
METHODS : Healthy volunteers, hypertensive patients and patients with coronary artery disease (CAD) performed a modified treadmill exercise test. We determined plasma catecholamines, thromboxane A2, prostacyclin, endothelin-1 and platelet aggregation induced by adenosine diphosphate (ADP) and collagen at rest and during exercise.
RESULTS : Our results during exercise showed a) platelet activation (increased thromboxane B2, TXB2), b) increased prostacyclin release from endothelium and c) decreased platelet aggregation in all groups, significantly more in healthy volunteers than in patients with CAD (with hypertensives lying in between these two groups).
CONCLUSION : Despite the pronounced activation of Sympathetic Nervous System (SNS) and increased TXB2 levels during acute exercise platelet aggregation decreases, possibly to counterbalance the prothrombotic state. Since this effect seems to be mediated by the normal endothelium (through prostacyclin and nitric oxide), in conditions characterized by endothelial dysfunction (hypertension, CAD) reduced platelet aggregation is attenuated, thus posing such patients in increased risk for thrombotic complications.
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result sql = The interaction of vasoactive substances during exercise modulates platelet aggregation in hypertension and coronary artery disease.
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char = s;code = 115
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = c;code = 99
char = h;code = 104
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = k;code = 107
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = m;code = 109
char = a;code = 97
char = x;code = 120
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = v;code = 118
char = a;code = 97
char = s;code = 115
char = o;code = 111
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = i;code = 105
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = b;code = 98
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = f;code = 102
char = u;code = 117
char = n;code = 110
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = M;code = 77
char = E;code = 69
char = T;code = 84
char = H;code = 72
char = O;code = 79
char = D;code = 68
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = H;code = 72
char = e;code = 101
char = a;code = 97
char = l;code = 108
char = t;code = 116
char = h;code = 104
char = y;code = 121
char = ;code = 32
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = u;code = 117
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = o;code = 111
char = n;code = 110
char = a;code = 97
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = C;code = 67
char = A;code = 65
char = D;code = 68
char = );code = 41
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = d;code = 100
char = m;code = 109
char = i;code = 105
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = m;code = 109
char = a;code = 97
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = c;code = 99
char = h;code = 104
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = b;code = 98
char = o;code = 111
char = x;code = 120
char = a;code = 97
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = A;code = 65
char = 2;code = 50
char = ,;code = 44
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = c;code = 99
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = -;code = 45
char = 1;code = 49
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = p;code = 112
char = h;code = 104
char = o;code = 111
char = s;code = 115
char = p;code = 112
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = A;code = 65
char = D;code = 68
char = P;code = 80
char = );code = 41
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = l;code = 108
char = l;code = 108
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = R;code = 82
char = E;code = 69
char = S;code = 83
char = U;code = 85
char = L;code = 76
char = T;code = 84
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = O;code = 79
char = u;code = 117
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = );code = 41
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = (;code = 40
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = b;code = 98
char = o;code = 111
char = x;code = 120
char = a;code = 97
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = B;code = 66
char = 2;code = 50
char = ,;code = 44
char = ;code = 32
char = T;code = 84
char = X;code = 88
char = B;code = 66
char = 2;code = 50
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = );code = 41
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = c;code = 99
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = l;code = 108
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = );code = 41
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = p;code = 112
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = h;code = 104
char = e;code = 101
char = a;code = 97
char = l;code = 108
char = t;code = 116
char = h;code = 104
char = y;code = 121
char = ;code = 32
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = u;code = 117
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = C;code = 67
char = A;code = 65
char = D;code = 68
char = ;code = 32
char = (;code = 40
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = l;code = 108
char = y;code = 121
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = b;code = 98
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result sql = BACKGROUND : Acute vigorous exercise, associated with increased release of plasma catecholamines, transiently increases the risk of primary cardiac arrest. We tested the effect of acute submaximal exercise on vasoactive substances and their combined result on platelet function.
METHODS : Healthy volunteers, hypertensive patients and patients with coronary artery disease (CAD) performed a modified treadmill exercise test. We determined plasma catecholamines, thromboxane A2, prostacyclin, endothelin-1 and platelet aggregation induced by adenosine diphosphate (ADP) and collagen at rest and during exercise.
RESULTS : Our results during exercise showed a) platelet activation (increased thromboxane B2, TXB2), b) increased prostacyclin release from endothelium and c) decreased platelet aggregation in all groups, significantly more in healthy volunteers than in patients with CAD (with hypertensives lying in between these two groups).
CONCLUSION : Despite the pronounced activation of Sympathetic Nervous System (SNS) and increased TXB2 levels during acute exercise platelet aggregation decreases, possibly to counterbalance the prothrombotic state. Since this effect seems to be mediated by the normal endothelium (through prostacyclin and nitric oxide), in conditions characterized by endothelial dysfunction (hypertension, CAD) reduced platelet aggregation is attenuated, thus posing such patients in increased risk for thrombotic complications.
Publication: BMC Cardiovasc Disord 2008 ;8:11. :doi: 10.1186/1471-2261-8-11.
Publication Date: 2008
Study Author(s): Petidis, Konstantinos;Douma, Stella;Doumas, Michael;Basagiannis, Ilias;Vogiatzis, Konstantinos;Zamboulis, Chrysanthos;
Institution: 2nd Propedeutic Department of Internal Medicine, Hippokration Hospital, Aristotle University of Thessaloniki, Greece. [email protected]
Shortcut link to this study:
Publication Date: 2008
Study Author(s): Petidis, Konstantinos;Douma, Stella;Doumas, Michael;Basagiannis, Ilias;Vogiatzis, Konstantinos;Zamboulis, Chrysanthos;
Institution: 2nd Propedeutic Department of Internal Medicine, Hippokration Hospital, Aristotle University of Thessaloniki, Greece. [email protected]
Shortcut link to this study:
BACKGROUND : Acute vigorous exercise, associated with increased release of plasma catecholamines, transiently increases the risk of primary cardiac arrest. We tested the effect of acute submaximal exercise on vasoactive substances and their combined result on platelet function.
METHODS : Healthy volunteers, hypertensive patients and patients with coronary artery disease (CAD) performed a modified treadmill exercise test. We determined plasma catecholamines, thromboxane A2, prostacyclin, endothelin-1 and platelet aggregation induced by adenosine diphosphate (ADP) and collagen at rest and during exercise.
RESULTS : Our results during exercise showed a) platelet activation (increased thromboxane B2, TXB2), b) increased prostacyclin release from endothelium and c) decreased platelet aggregation in all groups, significantly more in healthy volunteers than in patients with CAD (with hypertensives lying in between these two groups).
CONCLUSION : Despite the pronounced activation of Sympathetic Nervous System (SNS) and increased TXB2 levels during acute exercise platelet aggregation decreases, possibly to counterbalance the prothrombotic state. Since this effect seems to be mediated by the normal endothelium (through prostacyclin and nitric oxide), in conditions characterized by endothelial dysfunction (hypertension, CAD) reduced platelet aggregation is attenuated, thus posing such patients in increased risk for thrombotic complications.
METHODS : Healthy volunteers, hypertensive patients and patients with coronary artery disease (CAD) performed a modified treadmill exercise test. We determined plasma catecholamines, thromboxane A2, prostacyclin, endothelin-1 and platelet aggregation induced by adenosine diphosphate (ADP) and collagen at rest and during exercise.
RESULTS : Our results during exercise showed a) platelet activation (increased thromboxane B2, TXB2), b) increased prostacyclin release from endothelium and c) decreased platelet aggregation in all groups, significantly more in healthy volunteers than in patients with CAD (with hypertensives lying in between these two groups).
CONCLUSION : Despite the pronounced activation of Sympathetic Nervous System (SNS) and increased TXB2 levels during acute exercise platelet aggregation decreases, possibly to counterbalance the prothrombotic state. Since this effect seems to be mediated by the normal endothelium (through prostacyclin and nitric oxide), in conditions characterized by endothelial dysfunction (hypertension, CAD) reduced platelet aggregation is attenuated, thus posing such patients in increased risk for thrombotic complications.
PMID: 18505546
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