Final answer:
The nurse should assess for a pulmonary embolus as a potential complication in a client with infective endocarditis who has embolization from the mitral valve, as it can lead to serious health issues.
Step-by-step explanation:
In the case of a client with infective endocarditis who has embolization of vegetative lesions from the mitral valve, the nurse should assess for the potential complication of a pulmonary embolus. When vegetative lesions break off from the mitral valve, they can travel through the bloodstream to the lungs, where they can cause an embolism, potentially resulting in serious outcomes such as lung damage or even death due to the disruption of pulmonary circulation. It's important to monitor for signs of pulmonary embolism, such as difficulty breathing, chest pain, and hemoptysis.