Relationship between microvascular arterial anastomotic type and area of free flap survival: comparison of end-to-end, end-to-side, and retrograde arterial anastomosis.
BACKGROUND
Various types of arterial anastomosis are used in the recipient beds of clinical free flap transfers, but their respective hemodynamic efficiencies have not yet been elucidated. The purpose of this study was to investigate the relationship between the type of arterial anastomosis and the area of free flap survival. The authors transferred free three-territory flaps in rats using three different types of arterial anastomosis (end-to-end, end-to-side, and retrograde) and compared their areas of survival.


METHODS
Sixty Wistar rats were divided into three groups (n = 20 in each group). A free three-territory flap was elevated and transferred microsurgically to the left ventral region in each rat. The arterial anastomosis was performed in an antegrade end-to-end fashion in group 1, in an end-to-side fashion in group 2, and in a retrograde end-to-end fashion in group 3. The arterial blood flow to the flap was measured 30 minutes after revascularization. On day 5, the area of flap survival was evaluated and whole-body angiography was performed.


RESULTS
The average area of flap survival was 90.8 +/- 12.9 percent in group 1, 91.5 +/- 14.3 percent in group 2, and 53.4 +/- 15.5 percent in group 3. There was a statistically significant difference between group 3 and each of the other two groups.


CONCLUSIONS
End-to-side and end-to-end arterial anastomoses resulted in an equivalent blood inflow and area of flap survival. Retrograde arterial anastomosis was far inferior to antegrade arterial anastomosis in terms of the area of flap survival, and only the first vascular territory was safe from necrosis.
Tokyo and Saitama, Japan From the Department of Plastic and Reconstructive Surgery, Kyorin University School of Medicine, and the Department of Plastic and Reconstructive Surgery, Saitama Medical Center, Saitama Medical School.
Shimpei
S
Miyamoto
Akihiko
A
Takushima
Mutsumi
M
Okazaki
Norihiko
N
Ohura
Toshiharu
T
Minabe
Kiyonori
K
Harii
D000704:Analysis of Variance; D000714:Anastomosis, Surgical / Q000379:methods; D000792:Angiography; D000818:Animals; D001783:Blood Flow Velocity / Q000502:physiology*; D017536:Carotid Artery, Common / Q000000981:diagnostic imaging / Q000601:surgery; D004195:Disease Models, Animal; D006085:Graft Survival; D007083:Iliac Artery / Q000601:surgery; D008297:Male; D008833:Microcirculation / Q000502:physiology; D011336:Probability; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D019651:Plastic Surgery Procedures / Q000379:methods*; D012680:Sensitivity and Specificity; D013524:Surgical Flaps / Q000098:blood supply*; D013895:Thoracic Arteries / Q000000981:diagnostic imaging / Q000601:surgery