Which consequence often results from a massive pulmonary embolism?

Which consequence often results from a massive pulmonary embolism?

• A. Increased stroke volume
• B. Decreased left ventricular filling
• C. Improved systemic circulation
• D. Stable cardiac output

Answer: (B)

A massive pulmonary embolism leads to obstruction of blood flow in the pulmonary arteries, which significantly impacts hemodynamics. One of the primary consequences of this obstruction is decreased left ventricular filling. When a pulmonary embolism occurs, the right ventricle faces increased workload due to the obstruction, while the left ventricle may receive less blood return from the lungs because blood is not effectively being exchanged there. As a result, the preload to the left ventricle decreases, which translates to a reduction in the left ventricular end-diastolic volume. This inadequate filling can lead to a decrease in stroke volume and cardiac output, adversely affecting systemic circulation. The other options do not accurately reflect the physiological changes that occur with a massive pulmonary embolism; for instance, increased stroke volume is unlikely due to the reduced volume returning to the left ventricle. Similarly, improved systemic circulation would not occur in the setting of a significant obstruction, and stable cardiac output is often not maintained due to the acute nature of the event impacting both the right and left sides of the heart.

A massive pulmonary embolism leads to obstruction of blood flow in the pulmonary arteries, which significantly impacts hemodynamics. One of the primary consequences of this obstruction is decreased left ventricular filling.

When a pulmonary embolism occurs, the right ventricle faces increased workload due to the obstruction, while the left ventricle may receive less blood return from the lungs because blood is not effectively being exchanged there. As a result, the preload to the left ventricle decreases, which translates to a reduction in the left ventricular end-diastolic volume. This inadequate filling can lead to a decrease in stroke volume and cardiac output, adversely affecting systemic circulation.

The other options do not accurately reflect the physiological changes that occur with a massive pulmonary embolism; for instance, increased stroke volume is unlikely due to the reduced volume returning to the left ventricle. Similarly, improved systemic circulation would not occur in the setting of a significant obstruction, and stable cardiac output is often not maintained due to the acute nature of the event impacting both the right and left sides of the heart.