[Characteristic features of gouty patients].

Characteristic feature of pathogenesis, epidemiology and laboratory findings in hyperuricemia of gouty patients are studied and reasonable treatments of gout in clinical medicine are discussed. Gout is characterized by repeated arthritis attacks on the metacarpophalangeal joint of the first toe or other small joints, especially overworked joints or those exposed to cold. The arthritis attack lasts for 3.5 days and then diminishes gradually. The intervals are shortened in patients under poor hyperuricemic control but tophi formation is less frequent. Complications in combination with hyperlipidemia, diabetes mellitus, obesity and hypertension, which are compatible to syndrome X, are frequent in gouty patients and are suspected of rapidly progressing to arteriosclerosis, such as ischemic heart diseases. Hyperuricemia consists of over-production and underexcretion, which can be diagnosed by the urate clearance test. Classification is valuable for surveying the underlying diseases of secondary hyperuricemia and treating gouty patients. Underexcretion was observed in 85% of gouty patients with hyperuricemia and even the mean urate clearance in the overproduction type was significantly lower than that of normal controls, suggesting that underexcretion is a fundamental phenomenon in all gouty patients. Treatments of complications as well as those of hyperuricemia with uricosuric agents are required for clinical treatment of gouty patients.