NextGen Learning To Elevate Your Airway Practice
Study the cardiac physiology of intubation within the physiologically difficult airway PACscape. For bedside assessment, continue with cardiac POCUS before intubation.
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Let’s Talk About the Heart
We’ve spent a lot of time thinking about the airway before intubation—but what about the heart? A physiologically difficult airway isn’t just about anatomy or ventilation; it’s about hemodynamics too. Your need to intubate may negatively impact a cardiovascular system that is already in shock. Let’s learn how to assess and support heart function BEFORE intubation to avoid cardiovascular collapse in the peri-intubation period and beyond.
The Pathophysiology of Intubation
Positive pressure ventilation changes loading conditions on both ventricles. Increased intrathoracic pressure can reduce venous return and right ventricular preload. Lung overdistension can increase pulmonary vascular resistance and right ventricular afterload. The effect of PEEP depends on lung recruitment, overdistension and the patient’s baseline physiology. Increased intrathoracic pressure generally reduces left ventricular transmural afterload and may assist a failing left ventricle. Cardiac output can still fall when reduced venous return or right ventricular dysfunction limits left ventricular filling.
The Impact of Positive Pressure
How will your decision to intubate impact the heart of a critically ill patient? To be prepared for the consequences of intubation, you must first know what effect that procedure will have. We explain it here.
The Bottom Line
Understanding the impact of intubation on the heart is critical. A focused cardiac exam can identify severe left or right ventricular dysfunction, hypovolemia, tamponade, or dynamic outflow obstruction, all of which influence the choice of induction agents and resuscitative strategies. By assessing preload dependency, contractility, and the need for vasopressors or fluid optimization, a cardiac assessment helps guide tailored hemodynamic support before the physiologic stress of intubation. This proactive approach minimizes the risk of profound hypotension, cardiac arrest, and peri-intubation morbidity.
What’s Next
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