Perfusion Equipment & Technology Operation Flashcards

What is the primary function of a heart-lung machine?

Answer: Provides mechanical circulatory support

A heart-lung machine, also known as a cardiopulmonary bypass (CPB) machine, is used during cardiac surgery to temporarily take over the function of the heart and lungs. It circulates and oxygenates the patient's blood, allowing surgeons to operate on a still, bloodless heart while maintaining essential blood flow and oxygen delivery to the rest of the body.

Which component oxygenates the blood in the perfusion circuit?

Answer: Oxygenator

In a perfusion circuit, the oxygenator is the critical component responsible for oxygenating the blood and removing carbon dioxide. It mimics the function of the lungs, allowing gas exchange to occur between the patient's blood and a gas mixture. This ensures the blood is adequately oxygenated before being returned to the body, sustaining life during bypass.

What is the function of the roller pump in perfusion?

Answer: Generate flow through the tubing

The roller pump in a perfusion circuit is a type of positive displacement pump that generates continuous blood flow. It works by compressing flexible tubing against a raceway, pushing blood forward through the circuit. This action maintains circulation to the patient's body, effectively replacing the pumping function of the heart during cardiopulmonary bypass.

Why is anticoagulation necessary during bypass?

Answer: To prevent clot formation

Anticoagulation, typically achieved with heparin, is absolutely necessary during cardiopulmonary bypass. The exposure of blood to foreign surfaces within the bypass circuit can activate the coagulation cascade, leading to dangerous clot formation. Anticoagulants prevent these clots, ensuring smooth blood flow and preventing complications like embolism, which could be fatal.

What does a bubble detector do in a perfusion circuit?

Answer: Detects air in the line

A bubble detector is a crucial safety device in a perfusion circuit. It continuously monitors the blood flow for the presence of air bubbles, which can be extremely dangerous if introduced into the patient's circulation (air embolism). Upon detection, it triggers an alarm and can automatically shut down the pump to prevent harm, safeguarding the patient's well-being.

Which device helps regulate blood temperature?

Answer: Heater-cooler unit

The heater-cooler unit is an essential device in a perfusion circuit that precisely regulates the patient's blood temperature. It allows the perfusionist to warm or cool the blood as needed, which is critical for inducing hypothermia to protect organs during surgery or rewarming the patient post-bypass. Maintaining optimal temperature is vital for patient safety and outcome.

What is the importance of a pressure monitor in perfusion?

Answer: Measure perfusion pressure

Pressure monitors are vital in perfusion to continuously measure and display the patient's arterial and venous pressures within the extracorporeal circuit. Maintaining adequate perfusion pressure is critical to ensure sufficient blood flow and oxygen delivery to all organs and tissues, preventing ischemia and organ damage. These monitors provide real-time feedback for precise management.

Why is flow rate control critical in extracorporeal circulation?

Answer: Maintains adequate tissue perfusion

Flow rate control is paramount in extracorporeal circulation because it directly determines the amount of blood delivered to the patient's body per minute. Maintaining an adequate flow rate ensures that all tissues and organs receive sufficient oxygen and nutrients, preventing cellular damage and supporting organ function during bypass. Inadequate flow can lead to severe complications.

What safety feature shuts down the pump in case of an emergency?

Answer: Emergency stop switch

An emergency stop switch is a critical safety feature on a perfusion pump. In the event of a sudden malfunction, circuit breach, or other immediate danger, activating this switch instantly halts the pump's operation. This rapid shutdown prevents further blood flow and potential harm to the patient, acting as a last-resort safety mechanism.