Clinical wound infection occurs in 1-5% in patients undergoing surgery on clean areas such as muscle, bone or soft tissue.
10-20% of wound infections occur in patients undergoing surgery on hollow viscera, especially the colon and rectum as they contain large amounts of bacteria.
Hands are recognised as the main vectors of hospital acquired infections and evidence suggests that the act of hand decontamination significantly reduces the risk of cross infection.
The most important procedure of preventing infection in the operating theatre is surgical hand disinfection prior to surgery.
Proper skin cleansing and disinfection is enhanced by knowledge of the physiology of the skin, different types of bacteria carried on the skin and the specific action of detergents and antiseptic agents used for skin cleansing.
Micro-organisms are found in all levels of the skin and comprise the established resident and transient flora.
The principles and objectives of skin cleansing are:
- to remove dirt and transient microbes
- to reduce the resident microbial count as much as possible
- to prevent the rapid rebound growth of microbes
Antimicrobial agents used for surgical scrubbing should be:
- broad spectrum
- fast acting
- emollient
- non-drying
They should also, if possible accumulate in the skin with frequent and repeated use to provide a persistent effect.
The two most popular antimicrobial agents used for surgical scrubbing are povidone-iodine and 4% chlorhexidine gluconate.
The use of alcohol-based antiseptics is also a popular choice for surgical hand disinfection.
Alcohol based antiseptics are:
- very effective after cleansing with soap and water
- usually less expensive than alternatives
- at least as effective as an aqueous solution
- less irritant to the skin
- more effective therefore reducing the length of scrubbing times