Effect of Raised Head of the Bed on Lying Blood Pressure in Autonomic Failure

Tilt of the whole bed so that the head is elevated by 9 and/or 12 inches in an acute trial or overnight.

Elevation of the trunk through raising just the head of the bed until the head is elevated by 9 and/or 12 inches in an acute trial or overnight.

Tilt of the whole bed so that the head is elevated by 8 inches overnight.

Elevation of the trunk through raising the head 8 inches on a wedge pillow overnight.