DVT Confusion

When is a DVT, or deep-vein thrombosis, more dangerous to an ambulance crew than it is to the patient who's had one? Consider the following conversation:

Medic: "Does your husband have any medical conditions?"

WifeOfPatient: "Yes, he's diabetic and has high blood pressure."

Medic: "Any medications?"

WOP: "Oh, lots, I'll show you the list." A list is promptly produced. On there, alongside medications for the ailments already mentioned, is warfarin.

Medic: "Why is he on warfarin?"

WOP: "Oh, that's to thin the blood."

Medic: "Yes, well we know that bit. But why does he need his blood thinned?"

WOP: "Oh, he's got that thing, you know, the thing that's like a video or television thing."

Medic: "Pardon? What's TV got to do with blood thinners?"

WOP: "You know, that new-fangled thing they use to watch films now!"

Medic: "Nope. Still confused."

WOP: "Oh! I remember now. It's that thing in his leg. A DVD! Told you it was like a telly..."

Just so you know, it's a little difficult to treat your patient when you and your crew mate are having fits of the giggles...