The recruitment process was slower than expected.

A seroma is a collection of fluid other than pus or blood which forms through the division of numerous lymphatic channels, which normally drain the interstitial space under the skin. These channels become disrupted during surgical procedure and lead to seroma formation. This collection of fluid causes pressure in the local area, patient discomfort, and provides unfortunately an excellent culture medium for bacteria. Seroma development has been previously described in femoral vessel groin cannulation dissections after surgery. Conventional therapy is limited to draining the fluid, sometimes more than once, until there is full resolution of the seroma. If fluid collection recurs at the surgical site, sclerosant therapy with agents such as doxycycline. Doxycycline has been found to be a cost effective agent used as a sclerosant, which belongs to tetracycline class of antibiotics. The investigators hypothesize that prophylactic use of doxycycline at the site of femoral cannulation will prevent or minimize the area of seroma formation as compared to standard care of patients. The aim is driven towards limiting patient discomfort and visits to the clinic and to improve clinical care.

Inclusion Criteria:

• Male and female candidates (>18 and <85 years of age) undergoing Cardiopulmonary By-Pass via Femoral/Groin access as part of their routine cardiothoracic scheduled procedure will be approached for their interest in participation in the study.

Exclusion Criteria:

• A history of allergic reaction to doxycycline (Adoxa, Doryx, Oracea, Vibramycin) or any classes of tetracyclines- demeclocycline (Declomycin), or minocycline (Dynacin, Minocin, Solodyn, Vectrin).
• Patients who are not undergoing Cardiopulmonary By-Pass through femoral access.
• Active infection in the groin region.
• Females who are pregnant or lactating and breast feeding.
• Who do not wish to participate in the study.