Could a common antibiotic replace vancomycin in heart surgery?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Adult ≥ 18 years of age, * Cardiac surgery under ECC * Surgery scheduled in the morning (added to the schedule at least 24 hours before the operation and starting at 8 a.m. in order to send blood tests during working hours). * Written, informed consent from the patient before the start of the protocol. * The patient must understand spoken and written French * Negative pregnancy test and effective contraception (according to CTFG recommendations) during treatment for women of childbearing age * Men of reproductive age using effective contraception (according to CTFG recommendations) during treatment * Social security affiliation * Patient able to understand the objectives of the study and comply with the requirements of the protocol Exclusion Criteria: * Known hypersensitivity/allergy to clindamycin, lincomycin, and any other excipient listed in the SmPC * Known hypersensitivity/allergy to penicillins/drugs of the beta-lactam family * Patient on antibiotics other than cefazolin prior to surgery * Patient already on clindamycin at inclusion, * BMI\>35 * Aortic arch surgery * Coronary artery bypass graft surgery * Surgery for suspected endocarditis * Patients with chronic renal failure with creatinine clearance \< 60 mL/min and/or undergoing chronic dialysis * Patients with hepatic insufficiency (prothrombin rate\<50% excluding anticoagulant therapy) or Child B and C cirrhosis * Immunosuppressed patients receiving triple antiviral therapy * Pregnant or breast-feeding women * Women or men of childbearing age without effective contraception * Serious, uncontrolled concomitant bacterial infections (e.g. septic shock) * Patients deprived of their liberty by judicial or administrative decision (guardianship, curatorship, safeguard of justice) * Patient not registered with social security * Participation in any other therapeutic study with an exclusion period still in effect at the time of inclusion, or planned participation in another therapeutic study while taking clindamycin * Contraindications to cefazolin or any of the ancillary treatments * Mental state rendering the patient incapable of understanding the entire study * Patient being the investigator or any other member of the research team or being a relative of the investigator directly involved in the trial, including assistant physicians, pharmacists, nurses, and study coordinators