4Abi SF,Maloney JD.The usefulness of head-up tilt testing and hemodynamic investigation in the workup of syncope of unknown origin.PACE,1988,11(3):1204
6Klingenheben T,Kalusch D.Changes in Plasma epinephrine concentration and in heart rate during head-up tilt testing in Patients with neurocardiogenic syncope:J Cardiovasc Electrophysiol.sep,1996,7(9):202-208
7Bhargave B,Chandras C.Changes in circulatory biogenic amines during head-up tilt testing in neurocardiogenic syncope.Am Heart J,1996,48(6):659-662
8Crubb BP,Gerard G,Roush K,et al.Cerebral Vasoconstriction during head-up tilt induced Vasovagal syncope,a paradox and unexpected sponse.Circulation,1991,84(4):1157-1164
9Antonio R,Cianni C,Francesco D,et al.Nitroglycerin infusion during upright tilt:A new test for the diagnosis of vasovagal syncope.Am Heart J,1994,127(11):103
10Strasberg B,Rechavia E,Sagie A,et al.The head-up tilt test in patients with syncope of unknown origin.Am Heart J,1989,118(5):923
