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Related Experiment Videos

Calcium scoring: criteria for evaluating its effectiveness.

Nancy A Obuchowski1, Michael T Modic

  • 1Department of Biostatistics and Epidemiology, Cleveland Clinic Foundation, Cleveland, OH, USA.

Seminars in Ultrasound, CT, and MR
|April 24, 2003
PubMed
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Evaluating coronary calcium screening requires balancing benefits against harms. This paper proposes 10 criteria to assess screening effectiveness and estimate the number of patients needed to screen to benefit one patient (NNS) versus harm one patient (NSH).

Area of Science:

  • Cardiovascular imaging and screening
  • Medical diagnostics and risk assessment

Background:

  • Advanced multi-slice computed tomography (CT) enables high-resolution imaging of large body areas and rapid scanning of small regions like the heart.
  • CT scanners can accurately detect and quantify coronary artery calcium, a risk factor for coronary artery disease.
  • Coronary calcium screening, like all screening, presents a dilemma: benefits for a few versus potential harms (false positives/negatives) for others.

Purpose of the Study:

  • To address the dilemma of balancing benefits against harms in coronary calcium screening.
  • To propose a framework for evaluating the effectiveness of screening tests for disease risk factors.
  • To introduce 10 criteria for assessing screening effectiveness, applicable to coronary calcification and other screenings.

Main Methods:

Related Experiment Videos

  • Review of engineering advances in CT technology for cardiac imaging.
  • Discussion of the concept of Number Needed to Screen to Benefit (NNS) and Number Screened to Harm (NSH).
  • Proposal and discussion of 10 criteria for evaluating screening tests for risk factors, using coronary calcium scoring as a primary example.

Main Results:

  • The paper proposes 10 specific criteria for evaluating the effectiveness of screening tests designed to detect disease risk factors.
  • These criteria can be utilized to estimate the Number Needed to Screen to Benefit (NNS) and the Number Screened to Harm (NSH).
  • The framework is applicable to coronary calcification screening and can be extended to other screening programs, such as lung and colon cancer screening.

Conclusions:

  • A systematic evaluation using proposed criteria is essential for understanding the true utility of coronary calcium screening.
  • Quantifying NNS and NSH using these criteria helps in making informed decisions about screening implementation.
  • The proposed criteria offer a robust method for assessing screening effectiveness, promoting responsible application of diagnostic technologies.