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result sql = Impedance cardiography: a role in vasovagal syncope diagnosis?
Impedance cardiography: a role in vasovagal syncope diagnosis?
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char = b;code = 98
char = l;code = 108
char = o;code = 111
char = o;code = 111
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = I;code = 73
char = C;code = 67
char = G;code = 71
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = m;code = 109
char = e;code = 101
char = n;code = 110
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 = 1;code = 49
char = 0;code = 48
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = i;code = 105
char = n;code = 110
char = e;code = 101
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 = H;code = 72
char = U;code = 85
char = T;code = 84
char = .;code = 46
char = ;code = 32
char = V;code = 86
char = a;code = 97
char = s;code = 115
char = o;code = 111
char = v;code = 118
char = a;code = 97
char = g;code = 103
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = n;code = 110
char = c;code = 99
char = o;code = 111
char = p;code = 112
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = g;code = 103
char = n;code = 110
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
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 = e;code = 101
char = x;code = 120
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = m;code = 109
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
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 = n;code = 110
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = e;code = 101
char = m;code = 109
char = o;code = 111
char = d;code = 100
char = y;code = 121
char = n;code = 110
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
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 = 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 = r;code = 114
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = H;code = 72
char = U;code = 85
char = T;code = 84
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = n;code = 110
char = c;code = 99
char = o;code = 111
char = p;code = 112
char = a;code = 97
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 = ;code = 32
char = h;code = 104
char = a;code = 97
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = h;code = 104
char = e;code = 101
char = a;code = 97
char = r;code = 114
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 0;code = 48
char = 0;code = 48
char = 8;code = 56
char = );code = 41
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = b;code = 98
char = a;code = 97
char = r;code = 114
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = r;code = 114
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 = i;code = 105
char = v;code = 118
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = x;code = 120
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = ;code = 32
char = <;code = 60
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 0;code = 48
char = 0;code = 48
char = 1;code = 49
char = );code = 41
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = n;code = 110
char = -;code = 45
char = s;code = 115
char = y;code = 121
char = n;code = 110
char = c;code = 99
char = o;code = 111
char = p;code = 112
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = l;code = 108
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = O;code = 79
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
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 = h;code = 104
char = o;code = 111
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = n;code = 110
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 = u;code = 117
char = n;code = 110
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = n;code = 110
char = c;code = 99
char = o;code = 111
char = p;code = 112
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = o;code = 111
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = e;code = 101
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = H;code = 72
char = U;code = 85
char = T;code = 84
char = ;code = 32
char = (;code = 40
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = g;code = 103
char = n;code = 110
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = v;code = 118
char = a;code = 97
char = s;code = 115
char = o;code = 111
char = v;code = 118
char = a;code = 97
char = g;code = 103
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = n;code = 110
char = c;code = 99
char = o;code = 111
char = p;code = 112
char = e;code = 101
char = ;code = 32
char = 5;code = 53
char = 5;code = 53
char = ;code = 32
char = [;code = 91
char = 6;code = 54
char = 4;code = 52
char = %;code = 37
char = ];code = 93
char = ;;code = 59
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = 4;code = 52
char = 7;code = 55
char = ;code = 32
char = y;code = 121
char = e;code = 101
char = a;code = 97
char = r;code = 114
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = 1;code = 49
char = 7;code = 55
char = -;code = 45
char = 8;code = 56
char = 5;code = 53
char = );code = 41
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = v;code = 118
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = n;code = 110
char = e;code = 101
char = g;code = 103
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = i;code = 105
char = l;code = 108
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = (;code = 40
char = n;code = 110
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 3;code = 51
char = 1;code = 49
char = ;;code = 59
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = 4;code = 52
char = 7;code = 55
char = ;code = 32
char = y;code = 121
char = e;code = 101
char = a;code = 97
char = r;code = 114
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = 1;code = 49
char = 7;code = 55
char = -;code = 45
char = 8;code = 56
char = 8;code = 56
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = n;code = 110
char = o;code = 111
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 = ;code = 32
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = i;code = 105
char = o;code = 111
char = v;code = 118
char = a;code = 97
char = s;code = 115
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = u;code = 117
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = H;code = 72
char = U;code = 85
char = T;code = 84
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = R;code = 82
char = O;code = 79
char = C;code = 67
char = ;code = 32
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = d;code = 100
char = e;code = 101
char = l;code = 108
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = 8;code = 56
char = 5;code = 53
char = %;code = 37
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
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 = i;code = 105
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = x;code = 120
char = ;code = 32
char = (;code = 40
char = C;code = 67
char = I;code = 73
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = -;code = 45
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = x;code = 120
char = ;code = 32
char = (;code = 40
char = E;code = 69
char = D;code = 68
char = I;code = 73
char = );code = 41
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = f;code = 102
char = t;code = 116
char = ;code = 32
char = v;code = 118
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = w;code = 119
char = o;code = 111
char = r;code = 114
char = k;code = 107
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = x;code = 120
char = ;code = 32
char = (;code = 40
char = L;code = 76
char = V;code = 86
char = W;code = 87
char = I;code = 73
char = );code = 41
char = ;code = 32
char = w;code = 119
char = o;code = 111
char = u;code = 117
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = t;code = 116
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result sql = BACKGROUND : vasovagal syncope is the most common cause of syncope in all age groups, with diagnosis usually based on history, examination and basic investigations to exclude alternative causes of syncope. Where doubt exists, the head-up tilt (HUT) test is used for diagnosis but is time consuming and lacks a gold standard to accurately assess sensitivity and specificity. Alternative methods of diagnosing vasovagal syncope would thus be useful.

OBJECTIVE : to investigate the potential for impedance cardiography (ICG)-derived haemodynamic measures to predict HUT test outcome in unexplained syncope.

DESIGN : prospective controlled study.

SUBJECTS : eighty-six patients with unexplained syncope and 43 non-syncopal controls.

METHODS : all subjects underwent continuous heart rate, blood pressure and ICG measurements during 10 min supine rest and during HUT. Vasovagal syncope was diagnosed when patients experienced symptom reproduction with concomitant haemodynamic derangements.

RESULTS : during rest prior to HUT, the syncopal group had higher mean heart rate (P = 0.0008) and lower baroreceptor effectiveness index (P < 0.0001) compared to non-syncopal controls. On comparing patients who presented with unexplained syncope who subsequently had a positive HUT (therefore a diagnosis of vasovagal syncope 55 [64%]; mean age 47 years, range 17-85) to those having a negative tilt test (n = 31; mean age 47 years, range 17-88), there were no significant differences found in cardiovascular or autonomic parameters prior to HUT. A predictive ROC curve model at a 85% threshold allowed using cardiac index (CI), end-diastolic index (EDI) and left ventricular work index (LVWI) would identify those who would have a positive HUT from baseline cardiovascular measurements (CI >3.5, EDI > 77, LVWI >4.7) with 93% sensitivity and 17% specificity.

CONCLUSION : supine haemodynamic measures derived from transthoracic ICG can simply, non-invasively and sensitively differentiate HUT-positive patients from those with negative tilt tests. Further work is needed, particularly in older patients, before this technique can be used in clinical practice.

Publication: Age Ageing 2009 Nov ;38(6)::718-23.
Publication Date: 2009 Nov
Study Author(s): Parry, Steve W;Norton, Michael;Pairman, Jessie;Baptist, Mary;Wilton, Katharine;Reeve, Pam;Sutcliffe, Katy;Newton, Julia L;
Institution: Institute for Ageing and Health, Newcastle University, Newcastle upon Tyne, NE4 5PL, UK.
Shortcut link to this study:
BACKGROUND : vasovagal syncope is the most common cause of syncope in all age groups, with diagnosis usually based on history, examination and basic investigations to exclude alternative causes of syncope. Where doubt exists, the head-up tilt (HUT) test is used for diagnosis but is time consuming and lacks a gold standard to accurately assess sensitivity and specificity. Alternative methods of diagnosing vasovagal syncope would thus be useful.

OBJECTIVE : to investigate the potential for impedance cardiography (ICG)-derived haemodynamic measures to predict HUT test outcome in unexplained syncope.

DESIGN : prospective controlled study.

SUBJECTS : eighty-six patients with unexplained syncope and 43 non-syncopal controls.

METHODS : all subjects underwent continuous heart rate, blood pressure and ICG measurements during 10 min supine rest and during HUT. Vasovagal syncope was diagnosed when patients experienced symptom reproduction with concomitant haemodynamic derangements.

RESULTS : during rest prior to HUT, the syncopal group had higher mean heart rate (P = 0.0008) and lower baroreceptor effectiveness index (P < 0.0001) compared to non-syncopal controls. On comparing patients who presented with unexplained syncope who subsequently had a positive HUT (therefore a diagnosis of vasovagal syncope 55 [64%]; mean age 47 years, range 17-85) to those having a negative tilt test (n = 31; mean age 47 years, range 17-88), there were no significant differences found in cardiovascular or autonomic parameters prior to HUT. A predictive ROC curve model at a 85% threshold allowed using cardiac index (CI), end-diastolic index (EDI) and left ventricular work index (LVWI) would identify those who would have a positive HUT from baseline cardiovascular measurements (CI >3.5, EDI > 77, LVWI >4.7) with 93% sensitivity and 17% specificity.

CONCLUSION : supine haemodynamic measures derived from transthoracic ICG can simply, non-invasively and sensitively differentiate HUT-positive patients from those with negative tilt tests. Further work is needed, particularly in older patients, before this technique can be used in clinical practice.
PMID: 19749201

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