Safeguarding the Heart: Key Takeaways from the 2023 AmSECT Standards and Guidelines

1. Introduction: The Evolution of Perfusion Safety

The Perfusionist occupies a unique and indispensable role within the surgical care team. As the only allied healthcare professional specifically trained and educated in extracorporeal science, the Perfusionist's expertise is the primary safeguard when a patient’s circulatory and respiratory functions are delegated to a machine. To support this high-stakes responsibility, the American Society of ExtraCorporeal Technology (AmSECT) provides the Standards and Guidelines for Perfusion Practice.

These standards are not merely suggestions; they are the "Goal Statement" for our profession—a rigorous framework designed to improve the reliability, safety, and effectiveness of extracorporeal support services. Since the 2011 "Essentials," the document has evolved through revisions in 2013 and 2017 to the current 2022/2023 update. This latest iteration serves as the mandatory minimum foundation upon which every heart center must build its institution-specific protocols. As advocates for patient safety, we recognize these as the floor of clinical care, not the ceiling.

2. The Professional Foundation: Competency and Certification

Patient safety begins with the proficiency of the individual behind the pump. Standard 2 dictates that the conduct of cardiopulmonary bypass (CPB) is reserved for those who meet stringent professional criteria.

The three pillars of professional standing include:

• Board Certification: Perfusionists must be certified by the American Board of Cardiovascular Perfusion (ABCP) or demonstrate equivalent qualifications (Standard 2.1).
• Annual Competency Assessments: Clinical competency must be evaluated every year to ensure compliance with departmental and institutional protocols (Standard 2.2).
• Continuing Education: Practitioners are required to participate in and engage with perfusion-related continuing education on an annual basis to stay abreast of evolving evidence (Standard 2.3).

Safety also depends on adequate staffing. Guideline 15.1 advocates for the "n+1" staffing model. This means that for "n" number of operating rooms in use, there should be "n+1" Perfusionists available. For example, if three cardiac rooms are running concurrently, a minimum of four qualified Perfusionists is required to ensure adequate assistance, relief, and emergency coverage.

3. Bridging Standards to Practice: The Protocol Framework

To practice effectively, we must distinguish between mandatory requirements and recommended best practices. The AmSECT document defines these as follows:

• Standard: Practices and technology that institutions shall meet to fulfill minimum requirements for CPB.
• Guideline: A recommendation that should be considered when developing institutional protocols.
• Protocol: An institution-specific written document containing decision and treatment algorithms derived from these standards.

Precision in language is vital for safety, as evidenced by the specific word usage required in all documentation:

Term	Meaning
Shall	Indicates a mandatory requirement.
Should	Indicates a recommendation.
Continuously	Describing an action that occurs without ceasing (e.g., flow monitoring).
Continually	Describing an action that recurs frequently or regularly (e.g., blood gas analysis).

Under Standard 1.2, all protocols must be reviewed and revised annually. This process requires formal approval from the Director of Perfusion and the Chairman of Cardiac Surgery to ensure clinical alignment.

4. The Critical Safety Net: Devices and Monitoring

Reliability in the operating room is reinforced by redundant safety hardware and vigilant monitoring. Standard 6 mandates the use of specific devices to prevent catastrophic failures.

Essential Safety Hardware Checklist

• Pressure Monitoring: Mandatory for the arterial line, cardioplegia delivery systems, and the venous reservoir when augmented drainage is utilized. These must be servoregulated to control or interrupt flow and include audible/visual alarms (Standard 6.1).
• Bubble Detectors: Gross/macro bubble detectors must be capable of interrupting arterial flow and equipped with alarms (Standard 6.2).
• Level Sensors: Required for hard-shell reservoirs to maintain safe operational volumes (Standard 6.3).
• Arterial-Line Filters: External or integrated filters are required for patient protection (Standard 6.5).
• One-Way Valves: Mandatory in vent lines to prevent retrograde flow (Standard 6.6).
• Emergency Backups: Hand cranks, a backup power source (UPS), and a backup gas supply must be readily available for every case (Standard 6.9–6.11).

Comprehensive Physiological Monitoring

Standard 7 requires that Perfusionists monitor parameters based on their impact on patient stability. We monitor arterial blood pressure and arterial flow continuously (ceaselessly). Other parameters are monitored continually (regularly), including:

• Cardioplegia Parameters: Dose, delivery method, line pressure (antegrade), coronary sinus pressure (retrograde), and ischemic intervals (Standard 7.4).
• Temperatures: Patient core, heart-lung machine (arterial/venous/cardioplegia), and heater-cooler water (Standard 7.5).
• Blood Chemistry: Blood gases, hematocrit/hemoglobin, and venous oxygen saturation (Standard 7.6–7.10).

5. Communication: The "Sterile Cockpit" in the OR

Communication failures are a leading cause of adverse events. Standard 3 requires a patient-specific management plan to be communicated during a pre-operative briefing. To minimize error, we utilize:

• SBAR Handoff: When transitioning care, Perfusionists must use the protocol: Situation, Background, Assessment, Communication (Standard 3.2).
• Closed-Loop Communication: Per Guideline 3.2, the "sterile cockpit" concept should be applied via closed-loop communication to acknowledge verbal commands and verify content.
• Two-Person Checklist Verify: Safety is further bolstered by Guideline 5.1, which recommends that checklists be performed in a "read-verify" manner and completed by two people, one being the primary Perfusionist.

6. Precision in the Circuit: Anticoagulation and Blood Management

Safe bypass requires a collaborative approach to blood chemistry. Under Standard 8, the Perfusionist and supervising physician must define target Activated Clotting Times (ACT) and patient-specific heparin dosing.

To evaluate gas exchange precision, Standard 9.2 mandates the use of indexed Oxygen Delivery (DO2i) and Consumption (VO2i). These require the calculation of oxygen content:

• Arterial Oxygen Content (CaO2): (Hb x 1.36 x SaO2) + (0.0031 x PaO2)
• Mixed Venous Oxygen Content (CvO2): (Hb x 1.36 x SvO2) + (0.0031 x PvO2)
• DO2i Formula: 10 x CI x CaO2
• VO2i Formula: 10 x CI x (CaO2 – CvO2)

For blood management (Standard 13), we prioritize:

1. Minimizing Circuit Size: Reducing prime volume to limit hemodilution (Standard 13.2).
2. Collaborative Planning: Calculating and communicating predicted post-dilutional hemoglobin before initiation (Standard 13.3).
3. Autologous Priming: Utilizing retrograde arterial or venous antegrade priming (Guideline 13.1).
4. Sequencing: Discontinuing cardiotomy suction at the onset of protamine to prevent circuit clotting (Standard 12.1).

7. Preparing for the Unforeseen: Crisis and Readiness

The inclusion of Standard 19 in the latest update marks a pivot toward institutional resilience. Perfusionists must participate in creating actionable plans for infrastructure failures and supply chain interruptions. These plans include identifying alternate vendors, defining patient evacuation procedures for those committed to CPB, and repurposing staff during crises.

For "standby" cases where the risk of conversion to bypass is elevated, Standard 14 defines the Level of Readiness. This requires an assigned Perfusionist, a sterile extracorporeal setup, and a circuit maintained via aseptic technique.

8. Conclusion: A Commitment to Quality Improvement

The Perfusion Record (Standard 4) serves as a permanent, legal account of our care and a tool for Quality Assurance (Standard 17). Participation in clinical registries is essential to advance the safety of our profession through data.

However, as a "Special Note" to all practitioners: these standards are a foundation, not a substitute for clinical judgment. The responsible provider must make all treatment decisions based upon their independent judgment and the patient’s unique presentation. We use these standards to ensure that even in the most complex scenarios, our baseline remains unshakeable.

Top 5 Takeaways

1. Mandatory Safety Hardware: Every procedure shall include bubble detectors, level sensors, arterial filters, and pressure monitoring for the arterial line, cardioplegia, and venous reservoir.
2. SBAR and Communication: Transitions of care must follow the Situation, Background, Assessment, Communication protocol with closed-loop verification.
3. The "n+1" Model: Institutions should ensure a safety buffer in staffing (e.g., 4 Perfusionists for 3 active rooms) to maintain continuous care.
4. Read-Verify Checklists: Checklists should be completed by two people in a read-verify manner to catch potential oversights before they reach the patient.
5. Calculated Precision: Monitoring must include ischemic intervals and indexed oxygen delivery (DO2i) calculations to optimize physiological outcomes.