The "6 P's" of the Peripheral Vascular Assessment are commonly used as a neurological and neurocirculatory assessment. The "6 P's" are: pulselessness, (ischemic) pain, pallor, paresthesia, paralysis or paresis, and poikilothermia or "polar" (cool extremity). Some sources use delete poikilothermia for other "P's."
I have consulted many sources without success. My guess is that it appeared in a medical textbook since I cannot find any journal sources.
Any assistance is greatly appreciated!
Dr. Tom Oertel