[Experimental study of sentinel lymph node biopsy in larynx by using radioactive Nano tracer].
OBJECTIVE
Using radioactive Nano tracer at different sizes and doses in the Larynx of rabbits, to study the roles of them in the sentinel lymph node (SLN) biopsy in rabbits and to provide experimental evidences for the choices of ideal size and dose of radioactive Nano tracer of the sentinel lymph node biopsy in Laryngeal cancer patients.


METHODS
thirty rabbits were randomly divided into six groups with five rabbits in each group. After 50 nm--0.01 ml, 50 nm--0.02 ml, 80 nm--0.01 ml, 80 nm--0.02 ml,100 nm--0.01 ml, 100 nm--0.02 ml of 99mTc-sulfur Colloid were separately injected into the Larynx, the number of SLNs, the initial and strongest radioactive time of SLNs, and the lasting time of radioactivity was obtained.


RESULTS
One to three SLNs were identified in one rabbit, so there were totally forty-five SLNs, which in the areas of II, III and IV. The group of 50 nm--0.02 ml had the largest number of SLNs and there were significant differences between the group of 50 nm-0.02 ml and 100 nm--0.01 ml. In the six groups, the group of 50 nm--0.02 ml was the earliest group of detecting the initial and strongest radioactivity of SLNs,which the time were 49.20 s and 178.60 s; the group of 100 nm--0.01 ml was the latest group of detecting the initial and strongest radioactivity of SLNs, which the time were 235.80 s and 311.20 s. Each group had radioactivity more than 30 minutes.


CONCLUSIONS
The group of 50 nm--0.02 ml was the best group, because it moved fast and had a higher rate of uptake in lymphangio. Moreover, the radioactivity time was more than 30 minutes. It was the ideal size and dose of SLN biopsy in larynx.
Department of Otolaryngology Head and Neck Surgery, Renji Hospital, Shanghai, 20001, China.
Yonglan
Y
Zhang
Jiadong
J
Wang
Zheng
Z
Zhou
D000818:Animals; D007830:Larynx / Q000000981:diagnostic imaging*; D008198:Lymph Nodes / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D049329:Nanostructures; D011817:Rabbits; D011849:Radioactive Tracers; D011877:Radionuclide Imaging; D021701:Sentinel Lymph Node Biopsy / Q000379:methods*
D011849:Radioactive Tracers