We report on the mechanisms, the environmental changes and patient compliance with regard to conventional and new dust and mite avoidance measures to prevent allergic symptoms caused by mite allergens, taking into account both allergen contamination and the developmental success of pyroglyphid Acari. Twenty patients with persisting rhinitic complaints were selected and matched. Although the patients had performed some conventional dust and mite avoidance measures (patient compliance was 90%), the dwellings proved to be a stimulus for mite development. Moisture problems due to faulty construction and excessive moisture production were common. Since humidity conditions could not be changed at short notice, the 20 homes were subjected to the new variants of mite allergen avoidance based on intensive cleaning without (control) and with an acaricide incorporated (acaricidal cleaner [Acarosan]). After the carrying out of conventional avoidance measures, these patients still had allergic symptoms, and dust from only 23 to 52% of their textile objects was under the proposed guanine (mite faeces indicator) risk level. Only the acaricidal cleaner was able to decrease the allergenic mite load (and the burden of the patients) significantly in this 12 month period. With respect to mite-extermination, acaricidal cleaning was 88% better than intensive cleaning. Reduction of guanine was 38% better in the Acarosan treatment group. Clinical results have been reported elsewhere. A significant difference in favour of the acaricidal cleaning was seen in both subjective (as regards symptoms) and in objective data (total IgE). Another 50 patients were questioned.(ABSTRACT TRUNCATED AT 250 WORDS)

the efficacy of UGC as treatment of PAs is confirmed.

From 1984 to 1989 35 patients presented with uncharacteristic flank pain or recurrent urinary tract infections and small nonobstructing caliceal calculi. Thirty patients were treated; 13 with percutaneous stone extraction, 8 with extracorporeal shock wave lithotripsy, 3 with ureteroscopic stone manipulation and 2 by open surgery. Stone removal was successful in 39 patients and they were all relieved of their symptoms (86%). Stone size was decreased in 2 patients who felt a marked alleviation. Where the stone remained unaffected the symptoms persisted unabated. These observations suggest that small caliceal stones can cause pain. The results of treatment are such that it is justifiable to treat a small caliceal stone in patient suffering from flank pain of no other known cause.

I;roltr the Gynaecological Uepnrhwit ( A s g w t Clwisteiism, ilf. 11.). Hispebjerg Hospital, the C,'yrmecological Deparlmcnt ( S z~i c l I:elding, M . D.), Municipal Hospital, and the Kadium Stntiorr, (JQM Nidsesern, M. D.) Copenhugen