RESUMEN
To evaluate the etiology of extremely elevated erythrocyte sedimentation rate [ESR] in adolescents and adults at a tertiary care center. This retrospective, cross-sectional, observational study was carried out at King Abdulaziz Medical City, Riyadh, Saudi Arabia using the Wetergren method of determining ESR in adolescents and adults aged >/= 12 years. The patients included inpatients and outpatients with medical, surgical, and gynecological problems. During a period from June 2007 to October 2008, consecutive, non-repetitive patients with ESR >/= 100 mm/hour were evaluated for possible etiology by checking the electronic and paper data file of each patient. During the study period, out of the 44,366 ESR tests carried out at this center, 1864 [4.2%] had an ESR >/= 100 mm/hour belonging to 567 patients. Out of 508 patients fulfilling the study criteria, the main associated causes included: infections [38.6%], autoimmune diseases [15.9%], malignancy [15.4%], miscellaneous causes [10.2%], ischemic tissue injury or trauma [8.7%], and renal diseases [8.4%]. Ten common individual causes included: rheumatoid arthritis [7.3%], osteomyelitis [6.9%], tuberculosis [5.5%], trauma [5.3%], lymphoma and sepsis of unknown origin [5.1%] each, urinary tract infection [4.7%], septic arthritis [3.1%], abscesses [2.8%], and pregnancy [2.2%]. Fourteen [2.4%] patients had no known cause. Most of the patients with extreme ESR elevation have an underlying cause and a focused evaluation of such patients needs to be carried out to reach a diagnosis