Objective To assess the efficacy and associated complications of a leech therapy
protocol used for patients with a head and neck free tissue transfer in whom
flap viability is threatened because of surgically unsalvageable venous obstruction.
Design Medical record review of a prospective protocol.
Setting Tertiary care academic medical center.
Patients Of the 450 free tissue transfers to the head and neck region performed
by our microvascular program from January 1, 1995, to October 31, 2000, 8
patients (1.8%) developed venous obstruction not considered salvageable by
conventional surgical or thrombolytic therapy.
Interventions All 8 patients were placed on a protocol using leeches (Hirudo medicinalis), intensive care unit monitoring, antithrombotic
pharmacotherapy, frequent hematologic evaluation, blood transfusions as needed,
and antibiotic prophylaxis for Aeromonas hydrophila.
Main Outcome Measures Flap salvage rate, number of leeches used per patient, time needed for
inosculation, duration of intensive care unit admission, transfusion requirement
per patient, and complications during leech therapy.
Results All 8 flaps survived with the application of this protocol. An average
of 215 leeches were used per patient, and the average time needed for inosculation
was 6.6 days. The average duration in the intensive care unit was 9.6 days.
The morbidity of our protocol was substantial, with intensive care unit psychosis,
prerenal azotemia, and large transfusion requirements being the most frequent
complications. An average of 13 U of packed red blood cells per patient was
necessary.
Conclusions Aggressive application of the presented leech therapy protocol can salvage
free tissue transfers with venous obstruction that are otherwise unsalvageable.
The associated morbidity can be marked. Thus, judicious application of this
protocol for flap preservation is essential.
