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Primary intracerebral hemorrhage: impact of CT on incidence

I Drury, J P Whisnant, W M Garraway

    Neurology
    |May 1, 1984
    PubMed

    Insights

    Primary intracerebral hemorrhage (PIH) incidence rose due to better CT identification, with survival rates significantly improving from 8% to 44%. Anticoagulant use was linked to higher PIH rates.

    Area of Science:

    • Neurology
    • Epidemiology
    • Radiology

    Background:

    • Historically, primary intracerebral hemorrhage (PIH) incidence showed a decreasing trend.
    • Previous diagnostic methods may have led to misclassification of PIH as infarction.

    Purpose of the Study:

    • To investigate the changing incidence and survival rates of PIH.
    • To evaluate the impact of diagnostic advancements on PIH identification and outcomes.

    Main Methods:

    • Retrospective analysis of PIH cases in Rochester, MN, from 1945-1979.
    • Comparison of incidence and 30-day survival rates between different time periods.
    • Assessment of potential misdiagnosis and influence of anticoagulant therapy.

    Main Results:

    • PIH incidence increased from 1975-1979 compared to prior years.
    • 30-day survival rates for PIH improved dramatically from 8% (1945-1974) to 44% (1975-1979).
    • An estimated 24% of earlier PIH cases were mislabeled as infarction; anticoagulant use correlated with a 45% higher incidence rate.

    Conclusions:

    • Improved CT scan technology led to more accurate and frequent identification of small PIH cases.
    • Enhanced diagnostic capabilities contributed to the observed increase in PIH incidence and improved patient survival rates.

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