A positive ANA result at any level is consistent with the diagnosis of systemic rheumatic disease, but a result > or =3.0 U is more strongly associated with systemic rheumatic disease than a weakly-positive result. Positive ANA results >3.0 U are associated with the presence of detectable autoantibodies to specific nuclear antigens.
The Paroxysmal Disorders: Insights into the controversy of medical diagnosis and terminologies. Neppe, V. M. with Blumer D. The paroxysmal disorders: insights into the controversy of medical diagnosis and terminologies. (8 parts).
Its prevalence in the population increases with age, and it is estimated to affect over 4 percent of the population above the age of 60 [ 1-3 ]. (See Epidemiology of and risk factors for atrial fibrillation, section on 'Epidemiology' .). Paroxysmal AF (PAF), also termed intermittent AF, is defined as an episode of AF that terminates spontaneously or with intervention in less than seven days [ 4 ]. âPersistent,â âlongstanding persistent,â and âpermanentâ are clinical labels used for the other types of AF. (See Overview of atrial fibrillation .). This definition applies to recurrent intermittent episodes of AF that are unrelated to a reversible cause.