Certified Surgical Technologists (CST) Exam Prep

Lesson 3.3: Sterile Techniques and Asepsis

Sterile techniques and asepsis are fundamental practices in surgical technology designed to prevent infections and ensure patient safety during surgical procedures. As a surgical technologist, you play a crucial role in maintaining a sterile operating room (OR) environment. This lesson will cover the key concepts, techniques, and procedures necessary to uphold sterility and asepsis throughout the surgical process.

Understanding Sterility and Asepsis

1. Definition of Sterility

Sterility refers to the complete absence of all forms of microbial life, including bacteria, viruses, fungi, and spores. In the context of surgery, maintaining sterility is essential to prevent the introduction of harmful microorganisms into the surgical site, which could lead to surgical site infections (SSIs).

2. Definition of Asepsis

Asepsis is the practice of preventing infection by ensuring that only sterile objects and fluids come into contact with the surgical site. Aseptic techniques are the methods used to maintain this sterile environment and prevent contamination during surgery.

Key Principles of Sterile Technique

1. Sterile Field

The sterile field is the designated area that is kept free of all contaminants, typically including the patient’s surgical site, sterile instruments, draped areas, and any other surfaces that may come into contact with sterile items.

Establishing the Sterile Field: The sterile field is created by draping the patient, the Mayo stand, and the back table with sterile drapes. Only sterile items may be placed within this field, and all personnel involved in the procedure must adhere to sterile technique when working within it.
Maintaining the Sterile Field: The sterile field must be monitored continuously to prevent contamination. Surgical technologists are responsible for ensuring that the sterile field is not breached and that all personnel follow proper aseptic protocols.

2. Sterile Gowning and Gloving

Proper gowning and gloving are critical components of maintaining sterility. The process ensures that the surgical technologist and other team members do not introduce contaminants into the sterile field.

Gowning: After performing a surgical scrub, the surgical technologist dons a sterile gown, taking care not to touch the outer surface with bare hands. The gown is handled only by the inner surfaces until it is fully on.
Gloving: Sterile gloves are donned after the gown. Depending on whether the hands have come into contact with the gown’s exterior, the open gloving or closed gloving technique is used. Gloves must remain sterile and intact throughout the procedure.

3. Surgical Hand Scrub

The surgical hand scrub is performed before gowning and gloving to remove as many microorganisms as possible from the hands and arms. This reduces the risk of contamination should the gloves become compromised during the procedure.

Steps for Surgical Scrub: The surgical scrub involves scrubbing the hands and arms up to the elbows with an antimicrobial solution for a specified period, typically 5 to 10 minutes. This is followed by rinsing with water, ensuring that the hands remain above the elbows to allow water to drip away from the hands.
Waterless Scrub Options: In some settings, waterless scrubs may be used as an alternative. These involve applying an alcohol-based hand rub to the hands and forearms until dry, providing rapid and effective microbial reduction.

Techniques for Maintaining Asepsis

1. Proper Handling of Sterile Instruments

Instruments must be handled to maintain their sterility. This involves proper techniques for opening sterile packages, passing instruments to the surgeon, and handling them during the procedure.

Opening Sterile Packages: Sterile packages should be opened carefully, ensuring that the outer packaging does not contact the sterile field. Only the sterile contents are allowed to come into contact with the sterile field.
Passing Instruments: Instruments should be passed to the surgeon handle-first to prevent accidental injury or contamination. The surgical technologist should remain aware of the sterile field boundaries while passing instruments.
Handling During Procedures: Instruments should be used to maintain their sterility. This includes avoiding contact with non-sterile surfaces and ensuring that used instruments are placed back into the sterile field without contaminating other items.

2. Aseptic Techniques in the OR

Various aseptic techniques are employed to maintain a sterile environment throughout the surgical procedure:

Minimizing Traffic: To reduce the risk of airborne contamination, movement within the OR should be minimized. The doors should remain closed, and only essential personnel should enter the sterile field.
Maintaining Sterile Boundaries: The sterile field boundaries should be clearly defined, and all personnel must be aware of these boundaries to prevent accidental contamination.
Managing Breaks in Sterility: If a break in sterility occurs (e.g., a glove tears or an instrument touches a non-sterile surface), it must be addressed immediately. The contaminated item must be removed and replaced with a sterile one, and the situation should be documented as necessary.

3. Monitoring for Contamination

Constant vigilance is required to monitor for any breaches in sterility. All surgical team members share the responsibility for maintaining asepsis, and any potential contamination must be addressed immediately to prevent infection.

Visual Inspection: Regularly inspect the sterile field, instruments, and equipment for signs of contamination. This includes checking for breaches in sterile packaging and ensuring that sterile drapes remain intact.
Communication: Clear communication among the surgical team is essential for identifying and addressing any breaches in sterility. If contamination is suspected, it should be reported and managed promptly.

Challenges in Maintaining Sterility

Maintaining sterility and asepsis in the OR is challenging due to the dynamic and complex nature of surgical procedures. Common challenges include:

Time Pressure: Maintaining sterility under time pressure in fast-paced surgical environments can be difficult. It is crucial to balance efficiency with the need for meticulous sterile technique.
Complex Procedures: Longer and more complex surgeries increase the risk of contamination. Surgical technologists must remain vigilant throughout the procedure despite fatigue or distractions.
Unanticipated Events: Unexpected events, such as equipment malfunctions or sudden patient movements, can compromise sterility. Quick thinking and adherence to aseptic protocols are necessary to manage these situations effectively.

Limitations of This Lesson

This lesson provides a foundational overview of sterile techniques and asepsis, but these concepts require practice and experience to be fully mastered. Ongoing education, hands-on training, and adherence to best practices are essential for maintaining a sterile environment in the OR.

Conclusion

Sterile techniques and asepsis are critical to the success of surgical procedures and the safety of patients. By following the principles and techniques outlined in this lesson, you can help ensure that the operating room remains a sterile environment free from infection. As you continue your training, focus on refining these skills through practice and vigilance, and always prioritize sterility in every aspect of your work.

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