Final answer:
Amyloidosis and sarcoidosis are two infiltrative diseases that can impair left ventricular systolic function by affecting heart muscle activity.
Step-by-step explanation:
The two types of infiltrative diseases that can impair left ventricular systolic function are amyloidosis and sarcoidosis. Amyloidosis refers to a group of diseases where abnormal protein, amyloid, builds up in organs and tissues, affecting their function. Sarcoidosis is a condition where inflammatory cells produce granulomas in various organs, including the heart, which can disrupt regular heart muscle function, leading to a decrease in the heart's ability to pump blood effectively.