In addition to respiratory problems during anaphylaxis, an individual experiences widespread vasodilation and subsequent hypotension. To maximize venous return while awaiting emergency transport, the patient should be placed supine with legs elevated. The tripod position is used by individuals with chronic obstructive pulmonary disease to improve ventilation. Three-quarters prone position is the recovery position but does not facilitate venous return. Reclining with the head elevated impairs venous return.