Microwave coagulation therapy in canine peripheral lung tissue.
BACKGROUND
New modalities for local treatments that destroy tumor effectively but which are less invasive and less damaging to normal lung tissue must be developed for patients who are unable to undergo even video-assisted thoracic surgery (VATS) due to poor cardiopulmonary function, severe adhesion, or advanced age, etc. We evaluated the use of microwave coagulation therapy (MCT), which has been used successfully for coagulation of hepatic tumors, in normal canine lung tissue to evaluate its efficacy and safety.


METHODS
Measurements of thermal response and coagulation area and histological examinations after microwave coagulation were performed in normal canine lung tissue.


RESULTS
The temperature in normal canine lung tissue increased to 90-100 degrees C at 5 mm from the electrode after 60 s and 70-80 degrees C at 10 mm after 90 s at 40 or 60 W. The coagulation area was approximately 20 mm in diameter at 40 W and 60 W. Histological analysis demonstrated thickening of collagen fiber shortly after coagulation, stromal edema and granulation tissue after 3 months, and, finally, scar tissue was seen after 6 months.


CONCLUSIONS
Microwave coagulation therapy (MCT) is a useful modality for minimally invasive therapy in peripheral lung tumors.
Furukawa
Kinya
K
Department of Thoracic Surgery, Kasumigaura Hospital, Tokyo Medical University, 3-20-1 Chuo Ami-machi, Inashiki-gun, Ibaraki 300-0395, Japan. k-furu@tokyo-med.ac.jp
Miura
Toyoaki
T
Kato
Yasuhumi
Y
Okada
Shinya
S
Tsutsui
Hidemitsu
H
Shimatani
Hideaki
H
Kajiwara
Naohiro
N
Taira
Masahiro
M
Saito
Makoto
M
Kato
Harubumi
H
D000818:Animals; D003094:Collagen / Q000378:metabolism; D004285:Dogs; D004487:Edema; D004564:Electrocoagulation / Q000379:methods*; D006097:Granulation Tissue; D006979:Hyperthermia, Induced / Q000379:methods; D008168:Lung / Q000378:metabolism / Q000473:pathology* / Q000528:radiation effects*; D008872:Microwaves; D023421:Models, Animal
D003094:Collagen