Bacterial wound colonization after broad-spectrum versus narrow-spectrum antibiotics

Area of Science:

• Infectious Diseases
• Surgical Prophylaxis
• Antimicrobial Resistance

Background:

• Antibiotic prophylaxis in cardiac surgery aims to reduce infections and prevent resistance.
• Previous research indicates staphylococcal infection reduction but potential for increased resistance with certain antibiotics.

Purpose of the Study:

• To compare the efficacy of narrow-spectrum (nafcillin), mid-spectrum (cephapirin), and broad-spectrum (ceftriaxone) antibiotic prophylaxis in cardiac surgery.
• To evaluate the impact of different antibiotic spectra on preoperative and postoperative wound colonization and potential infection.

Main Methods:

• A study involving 78 cardiac surgery patients randomized to receive nafcillin, cephapirin, or ceftriaxone.
• Seventeen control patients undergoing other procedures received no antibiotics.
• Operative site cultures were obtained preoperatively and 3 and 6 days postoperatively.

Main Results:

• Preoperative staphylococcal skin colonization was uniformly high (95%) across all groups.
• Postoperatively, significantly more patients receiving nafcillin (48%) were culture-negative compared to cephapirin (27%) and ceftriaxone (22%) groups (p < 0.05).
• No increase in Gram-negative bacilli colonization or resistance was observed; infection rates did not differ significantly among treatment groups.

Conclusions:

• Narrow-spectrum antistaphylococcal penicillin (nafcillin) may offer advantages for cardiac surgery prophylaxis.
• This approach could potentially reduce costs associated with cardiac operations.
• Further investigation into the optimal antibiotic spectrum for surgical prophylaxis is warranted.