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G. A. Mecott and S. G. Hernández-Soto
differences in pure fat [56]. Similarly, the evidence discussed in this section has failed to undoubtedly show if removing blood or oil from the lipoaspirate has a benecial effect in regard to viability of the fatty graft.
10.10 Filtration andConcentration
Filtration and concentration are two commonly used techniques of processing, also designed to remove unwanted materials from the lipoaspirate. They typically con­sist of lavage and passage of the fat trough a lter, similar to dialysis, or absorbing the uids with some absorbable material. There are some studies about the efcacy of some systems designed to wash and lter the fat, which will be discussed below.
Puregraft™ consists of a closed bag with three ports: one for adding and remov­ing the lipoaspirate, the second for injecting Lactated Ringer’s solution (washing), and the third for removing the unwanted materials. Within the bag there are two membranes for ltering or dialyzing the uids. Zhu et al. demonstrated that Puregraft™ removed more liquid than decantation, although less than centrifugation. They also proved that this system is superior to decantation and centrifugation in removing red and white blood cells compared to centrifugation and decantation [70].
Revolve™ consists of a device with an outer canister and an inner lter basket with 200-μm pores that allows fat to be separated from the tumescent uid. It also requires to wash the lipoaspirate with Lactated Ringer’s solution, and have ports for the fat extraction. Ansorge et al. compared Revolve™ with centrifugation and decantation. They found that this system led to more adipose content than centrifu­gation and decantation, but centrifugation could remove more liquid. Graft take was similar in the Revolve™ system and the centrifugated samples. Decantation pro­duced signicantly less graft retention [71].
Hanson et al. compared both devices: Puregraft™ (passive ltration) and Revolve™ (Active ltration) and found similar amount of “graftable” fat with both devices. However, the active ltration system could process almost four times more fat per minute that the passive system [72]. They did not realize viability tests.
Tissu-Trans Filtron canister is a ltration system with lter pore sizes of 500 and 800μm. Fisher etal. assessed its utility to separate the components of the lipoaspi­rate and concluded that it produced virtually pure fat with either ultrasound-assisted liposuction and suction-assisted liposuction [73]. It is important to note that they collected the fat from a single patient.
With regard to concentration, Ramon etal. used an operating-room cotton towel to separate uid, oil, and debris from the lipoaspirate and compared it with centrifuged samples. They found no signicant differences regarding volume and weight of the grafted samples. Histologically, they found signicantly less brosis in ltered fat [62].
Salinas etal. found that ltration with mesh and Gauze produced a concentration of fat similar to centrifugation at 1200g. In regard to the number of stem cells, con­centration was similar to centrifugation [56]. Conversely, Pfaff stated that rolling the aspirate in Telfa Gauze pads led to increased viability and a higher number of ASCs that centrifugation at 1500rpm for 3min [74].
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10.11 Cell-Assisted Lipotransfer
Adipocytes constitute 70–90% of the volume of the adipose tissue in adults, and account for approximately 25% of the total cell population of the human body [75]. Nonadipocyte cell types in adipose tissue include preadipocytes, broblasts, endo­thelial cells, immune cells, and, more importantly, adipocyte-derived stem cells [76].
It was proposed that the supplementation of the fat grafting with ASCs, also called cell-assisted lipotransfer (CAL), might improve the retention rate of the fat grafting [77]. The proposed mechanisms for this improvement include increased neovascularization of the grafts [78] and resistance for necrosis [78, 79]. The ratio­nale for the use of CAL is that the lipoaspirate has low numbers of ASCs. So, by supplementing the lipoaspirate with ASCs, the probability for retaining the volume of the graft would be increased.
There are four possible roles for ASCs in enhancing the fatty graft
• The ASCs could differentiate into adipocytes and contribute to the regeneration
of the adipose tissue [32].
• ASCs could differentiate into vascular endothelial cells [80].
• Release of angiogenic factors, possibly improving vascularity of the recipient
site [81].
• Surviving as ASCs cells [77].
Adipose tissue has been identied as an abundant source of mesenchymal stem cells (MSCs), with characteristics similar to those obtained from bone marrow, which can easily be isolated and multiplied invitro [82]. These cells appear to be more resistant and have a major and more prolonged effect on the grafted fat and its surrounding tissues than adipocytes [31, 8284].
Some patient-related variables might inuence negatively the utility of the CAL.It has been shown that the vitality of the ASCs decreases with the age of the patient [85] and in the presence of some metabolic diseases, such as diabetes [86].
Experimental data (in rodent models) suggests that supplementation of the fat grafting with allogeneic ASCs improves its long-term volume retention [87]. This nding might open new therapeutic options for those cases where the condition of the patients is not ideal for using their own ASCs, such as older or diabetic patients.
However, the literature about CAL is still sparse, although promising. More research and clinical trials about it is required before its use would be considered as a standard in fat grafting.
10.12 Ultrasound-Assisted Liposuction
Since its rst description in 1987 by Scuderi et al. [88] Ultrasound-Assisted Liposuction (UAL) has gained popularity in body contouring. It has been stated that this technology is fat-selective and reduces trauma and blood loss [89]. However, since this modality uses energy and was designed to destroy adipocytes [90], there
160
is concern about the viability of the adipocytes obtained with this technology for grafting purposes.
Grippaudo etal. studied samples of conventional liposuction versus UAL.They found that UAL produced signicantly more triglycerides (considered as a mea­surement of rupture of the adipocytes membranes), while free fatty acids were simi­lar in both samples [91]. Similar results have also been observed in a porcine model [89]. These results were interpreted as increased lysis of adipocytes with UAL but no actual viability studies were performed to the cells. We believe that the purpose of the authors was to prove that UAL was effective in destroying adipocytes, and then the studies were not designed to assess residual viability of the cells.
Conversely, Schafer etal. designed their study to demonstrate that UAL could provide viable cells, suitable for grafting. They found that adipocytes obtained with UAL (60% amplitude, pulsed mode 1min/100 mL of inltration) had a viability rate of 85% (± 11%). No comparison was made with SAL to assess any difference between these two modalities, but the study clearly demonstrated that the fat obtained with UAL is suitable for grafting [92].
Duscher etal. demonstrated that ASCs are not damaged by UAL [93]. They also found similar amounts of viable ASCs with UAL and suction-assisted liposuction (SAL) [94].
With the available evidence, we can conclude that even if the UAL was designed to selectively destroy the adipocytes, the obtained fat could be used as fat grafting. However, it is also clear that some adipocytes are indeed destroyed with the cavita­tion process. Thus, more studies are necessary to assess if the lipoaspirate after UAL should be further processed (to remove destroyed cells) before it is used as a fat graft.
G. A. Mecott and S. G. Hernández-Soto
10.13 Additives
The addition of some substances such as insulin [95], enriched culture medium [96], and even Botulinum Toxin A [9799] has been described as strategies to improve cell viability of the lipoaspirate. However, the results are still experimental and we don’t recommend its use as of today.
10.14 Recipient Site andGrafting Technique
There is almost no literature about the role of the recipient site in fat grafting. That is probably because we infer that, as long as there is enough blood supply for the grafted cells, the recipient site is not important. Karacaoglu etal. stated that supra­muscular placement of the fat grafting results in better survival compared to sub­muscular or subcutaneous placement [100].
Also, there is very scarce data about the effect of the injection technique in the viability or retention of the fat graft. Lee etal. studied the effect of shear forces and
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positive pressure on the adipocytes. They found that applying positive pressure (up to 6atm. for 3min) in a static pressurized chamber had no effect of the outcome of the fat graft [53]. However, they found that shear forces signicantly affected the architecture and weight of the fat. They injected the fat at two different speeds:
0.5–1mL/seg and 2–5mL/seg and found better retention (volume) and less brosis and vacuoles at slow injection speeds. They concluded that adipocytes are not affected by positive pressures up to 25atm., but shear forces of 25atm. have tre­mendous impact in fat survival.
Other studies, apparently related to the effect of injection techniques on fat via­bility, mainly focus on techniques or devices that allow controlled volume injections and thus a possible reproducible effect [54, 101].
10.15 Conclusion
The science of fat grafting is fascinating. Great scientic advances have been made in just a few decades, but there is still a long road ahead. Plastic surgery is not just science, but also art. No wonder every surgeon is still innovating and adding their personal preference to the fat processing. However, evidence-based medicine should be the guide for every surgeon that performs fat grafting. A standardized protocol, based on science, should be the nal goal.
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G. A. Mecott and S. G. Hernández-Soto
Part IV
Данная книга находится в списке для перевода на русский язык сайта https://meduniver.com/
Surgical Technique in Fat Transfer