Final answer:
The recommended maneuver to use when performing a transesophageal contrast examination in a patient with a possible patent foramen ovale is the Valsalva maneuver.
Step-by-step explanation:
The recommended maneuver to use when performing a transesophageal contrast examination in a patient with a possible patent foramen ovale is the Valsalva maneuver. The Valsalva maneuver involves forcefully exhaling against a closed airway, which increases intra-abdominal pressure and can help detect a patent foramen ovale by causing blood flow changes in the heart.