Conflict of interest: None declared.
Clinical Investigative Study
Jugular Valve Incompetence in Transient Global Amnesia. A Problem Revisited
Article first published online: 3 SEP 2013
Copyright © 2013 by the American Society of Neuroimaging
Journal of Neuroimaging
How to Cite
Lochner, P., Nedelmann, M., Kaps, M. and Stolz, E. (2013), Jugular Valve Incompetence in Transient Global Amnesia. A Problem Revisited. Journal of Neuroimaging. doi: 10.1111/jon.12042
- Article first published online: 3 SEP 2013
- Manuscript Accepted: 9 MAY 2013
- Manuscript Revised: 7 MAY 2013
- Manuscript Received: 28 FEB 2013
- Transient global amnesia;
- internal jugular venous valve incompetence;
- basal vein of Rosenthal;
- Valsalva maneuver;
- flow velocities
BACKGROUND AND PURPOSE
Previous studies have suggested that transient global amnesia (TGA) may be provoked by cerebral venous congestion due to a reflux during Valsalva maneuver (VM) caused by internal jugular venous valve incompetence (IJVVI). We investigated the hemodynamic consequences of postural changes on IJVVI and on intracranial veins in patients with TGA and control subjects.
MATERIALS AND METHODS
IJVVI was assessed by means of extracranial color-coded duplex sonography during VM in 28 patients with TGA and 25 controls. The basal vein Rosenthal was examined by transcranial color-coded sonography registering flow velocities (FV) at rest and during VM. These measurements were performed in the supine and in a sitting position.
IJVVI was identified in supine position in 19/28 (68%) of TGA patients and in 7/25 (28%) of controls (P < .05). Body position had no effect on the detection of IJVVI. Intracranial venous FV at rest and during VM did neither differ between patients and controls, nor between persons with and without IJVVI.
Consistent with results of other groups, we found a significantly higher rate of IJVVI in TGA patients compared to controls. However, we found no differences of intracranial venous circulation between groups nor an effect of body position. This sheds doubt on the assumption of a causative effect of IJVVI in TGA.