An increase in neck vein distension correlates to a future worsening of the subject's CHF status during the predetermined future time period. [0031] In another example, the subject's abdominojugular reflex (e.g., bulging of neck vein upon applying compression to the subject's thorax) is used as a CHF physiologic parameter 200H. In one example, the subject, caregiver, or other user enters an indica