Infectious Disease Compendium

Fagets Sign

Diagnosis

Aka pulse-temperature disassociation (it is French, so pronounced fah-jay. In this era of PC, using a hard g will result in suffering the approbation of others).

When the temperature goes up a degree, the pulse should go up 10 (except, of course, when the patient has heart block from their myocardial abscess or is on beta blockers).

It has interesting differential that is always fun for Chief of Service rounds: typhoid fever, brucellosis, psittacosis, legionellosis, tularemia, yellow fever, dengue are the big ones.