An Experimental Murine Model to Assess Biofilm Persistence on Commercial Breast Implant Surfaces

Capsular contracture is the most frequently associated complication following breast implant placement. Biofilm formation on the surface of such implants could significantly influence the pathogenesis of this complication. The objective of this study was to design an experimental model of breast implant infection that allowed us to compare the in vivo S. epidermidis ability to form and perpetuate biofilms on commonly used types of breast implants (i.e., macrotexturized, microtexturized, and smooth). A biofilm forming S. epidermidis strain (ATCC 35984) was used for all experiments. Three different implant surface types were tested: McGhan BIOCELL® (i.e., macrotexturized); Mentor Siltex® (i.e., microtexturized); and Allergan Natrelle Smooth® (i.e., smooth). Two different infection scenarios were simulated. The ability to form biofilm on capsules and implants over time was evaluated by quantitative post-sonication culture of implants and capsules biopsies. This experimental model allows the generation of a subclinical staphylococcal infection associated with a breast implant placed in the subcutaneous tissue of Wistar rats. The probability of generating an infection was different according to the type of implant studied and to the time from implantation to implant removal. Infection was achieved in 88.9% of macrotextured implants (i.e., McGhan), 37.0% of microtexturized implants (i.e., Mentor), and 18.5% of smooth implants (i.e., Allergan Smooth) in the short-term (p < 0.001). Infection was achieved in 47.2% of macrotextured implants, 2.8% of microtexturized implants, and 2.8% of smooth implants (i.e., Allergan Smooth) in the long-term (p < 0.001). There was a clear positive correlation between biofilm formation on any type of implant and capsule colonization/infection. Uniformly, the capsules formed around the macro- or microtexturized implants were consistently macroscopically thicker than those formed around the smooth implants regardless of the time at which they were removed (i.e., 1−2 weeks or 3−5 weeks). We have shown that there is a difference in the ability of S epidermidis to develop in vivo biofilms on macrotextured, microtextured, and smooth implants. Smooth implants clearly thwart bacterial adherence and, consequently, biofilm formation and persistence are hindered.

Inverted Nipple Correction Techniques: An Algorithm Based on Scientific Evidence, Patients' Expectations and Potential Complications

BACKGROUND

Inverted nipple is a problem that affects a large number of women, with an aesthetic and functional repercussion. The literature is abundant in terms of techniques described, from the most conservative to the most aggressive. Although different techniques have been described to correct inverted nipples, there are no established algorithms to guide the surgeon in choosing the correct technique for each patient. Therefore, the objective of this paper is to present the first algorithm to simplify the inverted-nipple approach, based on the most recent scientific evidence and the patient's wishes.

METHODS

A bibliographic review on this pathology and available treatments was carried out to build an algorithm. Then, 47 patients consulting about inverted nipple concerns were included in this study. First, the patient's breastfeeding concerns were discussed. Once breastfeeding concerns were known, exploration of inverted nipple and assessment based on the degree of severity was done. Different techniques were proposed according to the degree of inverted nipple. Our technique was indicated in the most severe cases of retraction.

RESULTS

Forty-seven surgical and non-surgical procedures were carried out, resulting in excellent outcomes and high satisfaction rates. No complications or recurrence were observed after 1-year follow-up.

CONCLUSIONS

This is the first time an algorithm to simplify the approach of the inverted nipple has been proposed based on the degree of severity and lactation wishes. Choosing the right procedure for each patient will help the plastic surgeon in achieving great satisfaction and an excellent aesthetic result.

LEVEL OF EVIDENCE IV

This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .