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Related Concept Videos

z Scores and Unusual Values01:07

z Scores and Unusual Values

The z score is one of the three measures of relative standing. It describes the location of a value in a dataset relative to the mean. z scores are obtained after the standardization of the values in a dataset. The z score for the mean is 0.
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z scores are the standardized values obtained after converting a normal distribution into a standard normal distribution. A z score is measured in units of the standard deviation. The z score tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a z score of zero.
Wilcoxon Rank-Sum Test01:21

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Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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Siena EVAR Score.

F Setacci1, P Sirignano, G Galzerano

  • 1Vascular and Endovascular Surgery Unit. University of Siena, Siena, Italy. setacci@unisi.it

The Journal of Cardiovascular Surgery
|March 30, 2012
PubMed
Summary
This summary is machine-generated.

A new score helps predict reintervention or conversion risk after endovascular aneurysm repair (EVAR) for abdominal aortic aneurysms (AAA). This tool aids in assessing individual patient risk for better surgical planning.

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Signal Acquisition, Score Interpretation, and Economics of a Non-Invasive Point-of-Care Test for Coronary Artery Disease
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Area of Science:

  • Vascular Surgery
  • Medical Device Technology
  • Risk Stratification

Background:

  • Endovascular aneurysm repair (EVAR) for abdominal aortic aneurysms (AAA) shows good short-term results, but long-term outcomes regarding complications and reinterventions remain debated.
  • Assessing individual patient risk for reintervention or conversion after EVAR is crucial for optimal patient management.

Purpose of the Study:

  • To develop and present a novel scoring system to predict the risk of reintervention or conversion following EVAR in patients with AAA.
  • To provide a tool for stratifying patients into low, moderate, or high-risk categories based on their likelihood of needing further procedures.

Main Methods:

  • A prospective, five-year study included patients undergoing EVAR for AAA, excluding those with ruptured aneurysms or treated with fenestrated/chimney techniques.
  • Data on reinterventions, surgical conversions, and aneurysm-related deaths were collected. Predictors of complications were analyzed to create a numeric risk score.

Main Results:

  • Out of 976 EVAR procedures, 2.35% required reintervention and 0.61% needed conversion to open surgery.
  • Aneurysm-related deaths occurred in 0.4% of cases. The Siena EVAR Score categorized patients into EVAR1 (<3), EVAR2 (3-6), and EVAR3 (>6) risk groups.

Conclusions:

  • The developed Siena EVAR Score can be a valuable tool for predicting individual patient risk after EVAR.
  • Further validation in independent cohorts across different centers is necessary to confirm the score's reliability and generalizability.