Summary
In-vitro studies indicate that new miniature cryoprobes are suitable
for cryoablation of bone tissue. Purpose of this experiment in 24 sheep was to
examine the perioperative complications - in particular the danger of
embolism - of cryoablation with miniature cryoprobes.
Cryoablation with 2 freeze-thaw-cycles each was carried out in the
right tibia epiphysis and the left femur metaphysis. Pulmonary artery pressure
(PAP) and central venous pressure (CVP) were measured. Throughout the intra-
and perioperative phase heart rate and oxygen saturation by pulse oxymetry,
blood gas and electrolytes were monitored regularly. Postoperative
complications were examined.
A result, no significant increase of PAP, CVP or heart rate was
measured. During the entire operation the results of the blood gas analyses
were inconspicuous; pO2 and pCO2 were constant; for pH,
standard bicarbonate and baseexcess an isolated insignificant change to slight
acidosis was noted. The average decrease of HB was 0,5 g/dl. In one animal
postoperative wound infection and wound necrosis was observed.
Occurrence of major perioperative complications of cryosurgical
treatment of bone tissue, especially regarding clinically relevant pulmonary
embolism, were not confirmed in experiments with sheep. Using new types of
miniature cryoprobes, cryosurgery appears to be a safe alternative or addition
to resectional procedures for treating abnormal bone tissue.
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Korrespondenzadresse:
Dr. med. F. Popken
Klinik und Poliklinik für Orthopädie der
Universität zu Köln
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50924 Köln
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