Human hydatid disease leading to hospital admission in Scotland 1968-1989.

An attempt to estimate the impact of hydatid disease upon human health in Scotland between 1968-89 was made by examining Scottish hospital discharge statistics, and death statistics. Because hydatid disease may be asymptomatic, and coding errors are more likely to occur with rare diseases, an assessment was made as to the likelihood of hydatid disease having been responsible for hospital admission. Over the 22 year period a total of 110 hospitalised individuals with a diagnosis of hydatid disease were identified; no deaths were recorded. Inspection of the other diagnoses and operations recorded for each case suggested that hydatid disease was responsible for hospital admission in only 65 individuals (59%). One further individual, who had been admitted to a hospital outside Scotland, was identified from a Western Isles register of cases receiving surgery for hydatid disease. This register was used to assess the completeness of the Scottish hospital statistics; 10/11 Western Isles cases were identified using hospital statistics. Local case registers seem essential for accurate estimates of incidence and prevalence, and to evaluate the need for control programmes. The median age of the 66 individuals considered to have been admitted to hospital because of hydatid disease was 49 years (range 4-85); 38 (58%) were male. A total of 36 cases were managed surgically (55%), and there was a tendency for the use of surgery to increase over the 22 year period. The Health Boards with the highest incidence of clinically apparent infection leading to hospital admission were: Western Isles, Shetland and Highland; with 2.53, 1.23, and 0.21 cases per 100,000 population per year respectively.