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Descriptive epidemiology of Creutzfeldt-Jakob disease in Finland
Insights
Creutzfeldt-Jakob disease (CJD) surveillance in Finland from 1974-1984 identified 30 deaths. Familial CJD cases were significantly younger than sporadic ones, and women had a higher death rate in sporadic CJD.
Area of Science:
- Neurology
- Epidemiology
- Public Health
Background:
- Creutzfeldt-Jakob disease (CJD) is a rare, fatal neurodegenerative disorder.
- Understanding CJD incidence and demographics is crucial for public health surveillance.
Purpose of the Study:
- To analyze the incidence, demographics, and clinical characteristics of CJD cases in Finland between 1974 and 1984.
- To investigate potential trends and risk factors associated with CJD in the Finnish population.
Main Methods:
- Retrospective analysis of 30 CJD deaths in Finland (1974-1984).
- Inclusion of pathologically confirmed and probable cases.
- Comparison of demographic and clinical data between familial and sporadic CJD.
Main Results:
- 30 CJD deaths occurred; 20% were familial cases.
- Familial CJD patients were significantly younger at death (median 49.5 years) than sporadic cases (median 61.5 years).
- Sporadic CJD showed a higher death rate in women across all age groups, with a peak incidence in the 60-64 age bracket.
Conclusions:
- The observed increase in CJD cases likely reflects enhanced diagnostic awareness rather than a true incidence rise.
- Age and genetic factors influence CJD presentation, with distinct patterns in familial versus sporadic forms.
- Further research into CJD epidemiology and risk factors is warranted.
Abstract:
In 1974-84 30 patients died with a diagnosis of Creutzfeldt-Jakob disease (CJD) in Finland. Sixteen of the patients were pathologically confirmed and 14 were probable cases; 6 were familial (20%). One further familial patient was alive at the end of 1984. The median age of the 30 patients at death was 59.5 years (range 46-73 years). The familial patients were significantly younger than sporadic cases (median and range 49.5 and 46-57 versus 61.5 and 51-73; P less than 0.01). Only 5 of the 24 sporadic patients were men (male to female ratio 1:3.8). The annual number of new cases as well as the death rate increased in the late 1970's (annual death rate 0.57 per million in 1974-84 and 0.91 in 1979-84). This probably reflects the growing awareness of CJD among neurologists, rather than a real increase of the incidence and death rate. Annual age-specific death rate per 1 million population in 1974-84 reached a peak value of 2.57 in the age group of 60-64 years. In sporadic CJD the age-specific death rate of women was higher than that of men in all age groups. A chronic medical condition, precedent or concomitant with CJD, was seen in 15 patients.