Final answer:
A significant number of deep vein thrombosis (DVT) cases may occur without symptoms. Patients with conditions like heart failure are at higher risk and should take preventive measures such as movement and exercises, especially during long periods of inactivity like flights.
Step-by-step explanation:
The student is asking about the percentage of deep vein thrombosis (DVT) cases that are asymptomatic. While the question does not provide a specific statistic, medically reviewed literature suggests that a significant number of DVT incidents may occur without any symptoms. In the context of the risks associated with DVT, especially for individuals with heart failure like Ahaya, it is important to note that patients with chronic conditions are at higher risk for DVT and its complications. Frequent movement and leg exercises are recommended, especially during situations, like air travel, that involve prolonged sedentary periods to help prevent the formation of clots in the deep veins of the legs.