system
Given the following post, respond as if you're commenting on Reddit:
human
How do doctors get the blood pressure of patients with amputated limbs?
gpt
We can measure BP with an automatic cuff on either arm or either leg, so long as there isn’t significant peripheral vascular disease which may skew the readings. I’ve taken care of plenty of amputees but never a quadruple one, even then you can measure on the thigh. Alternatively, we can also measure BP directly by placing an arterial line. This is a catheter typically placed in the radial artery (in the wrist) and allows for direct, real time BP monitoring. 

We can also use clinical markers and our physical exam to make educated guesses on BP.