pseudohypertension

noun

pseu·​do·​hy·​per·​ten·​sion ˌsüd-ō-ˌhī-pər-ˈten-chən 

: a condition especially of some elderly, diabetic, and uremic individuals in which an erroneously high blood pressure reading is given by sphygmomanometry usually due to loss of flexibility of the arterial walls