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Laminar air-flow versus conventional air operating systems: a seven-year patient follow-up
Abstract:
A 7-year follow-up was conducted on 183 total hip replacements and evaluated for infection. Eighty-seven operations were done in a horizontal laminar air-flow operating room and 89 were done in a conventional operating room without laminar air-flow. In the laminar air-flow group, there were 2 infections (2.2%) and 6 (6.7%) in the conventional operating room. Excluding those patients who had undergone previous operations, there were 3 infections out of 76 (4%) in the conventional operating room group. One infection out of 68 (1%) occurred in the laminar air-flow group. There were no statistical differences in the infection rates. These data are interpreted to suggest that daily uncontrollable variables which may produce infections are minimized by the use of laminar air-flow operating rooms.
Insights
Laminar air-flow operating rooms may reduce infection risk following total hip replacement surgery. While not statistically significant, infection rates were lower in the laminar air-flow group compared to conventional rooms.
Area of Science:
- Orthopedic Surgery
- Infectious Disease Control
- Hospital Engineering
Background:
- Surgical site infections (SSIs) are a significant complication following total hip replacement (THR).
- Operating room (OR) environmental factors, such as air quality, are hypothesized to influence SSI rates.
- Horizontal laminar air-flow (HLAF) systems aim to reduce airborne contaminants in the OR.
Purpose of the Study:
- To evaluate the impact of horizontal laminar air-flow operating rooms on infection rates after total hip replacement.
- To compare infection incidence between THR procedures performed in HLAF ORs versus conventional ORs.
Main Methods:
- A 7-year follow-up study involving 183 total hip replacement patients.
- Patients were divided into two groups: those operated in an HLAF OR (n=87) and those in a conventional OR (n=89).
- Infection rates were assessed and compared between the two groups, with a subgroup analysis excluding patients with prior surgeries.
Main Results:
- Overall infection rates were 2.2% (2/87) in the HLAF group and 6.7% (6/89) in the conventional OR group.
- Excluding prior surgery patients, infection rates were 1% (1/68) in the HLAF group and 4% (3/76) in the conventional OR group.
- No statistically significant difference in infection rates was found between the two groups.
Conclusions:
- While not statistically significant, a trend towards lower infection rates was observed with HLAF operating rooms.
- HLAF technology may help minimize uncontrollable daily variables that contribute to surgical site infections.
- Further research with larger sample sizes may be warranted to confirm the statistical significance of these findings.