Substituting a Cryo-Preserved Cadaveric Vein or an in Situ or Reversed

Substituting a cryo-preserved cadaveric vein or an in situ or reversed vein graft from the patient for an arterial bypass graft is an option for patients who have healthy,easily accessed saphenous veins.How does an in situ vein graft differ from a reversed vein graft?

A) With the in situ method,the vein segment is resected,reversed,and anastomosed into position.
B) The in situ method leaves the vein in its position and the valves are removed.
C) Arteriovenous fistulas are a common complication with the reversed vein graft method.
D) Valvulotomes are used to remove the valves in both methods.

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