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Inter-rater reliability of quantifying pleural B-lines using multiple counting methods.

Kenton L Anderson¹, J Matthew Fields, Nova L Panebianco

¹Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA. kentonlanderson@gmail.com

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine

|December 28, 2012

Summary

This summary is machine-generated.

Three ultrasound methods for quantifying sonographic B-lines showed good inter-rater agreement. Method 3, counting B-lines at peak inspiration, demonstrated the highest reliability and is recommended for its simplicity and accuracy in assessing lung water.

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Area of Science:

Pulmonary Medicine
Diagnostic Imaging
Critical Care

Background:

Sonographic B-lines indicate increased extravascular lung water, a key indicator in acute heart failure.
Various methods exist for quantifying B-lines, but their interobserver reliability is not well-established.
Accurate B-line quantification is crucial for reliable assessment of pulmonary edema.

Purpose of the Study:

To evaluate the inter-rater reliability of three distinct methods for quantifying sonographic B-lines.
To compare the reliability and technical feasibility of different B-line counting techniques.
To identify the most reliable method for assessing B-lines in patients with suspected acute heart failure.

Main Methods:

Three blinded emergency physicians reviewed 456 videotaped pleural assessments of dyspneic patients.
They applied three methods for counting B-lines: (1) over a respiratory cycle, (2) including confluent B-lines by percentage, and (3) at peak B-line visibility.
Inter-rater reliability was assessed using single-measures intraclass correlation coefficients (ICCs).

Main Results:

All three methods demonstrated substantial inter-rater agreement, with ICCs ranging from 0.84 to 0.89.
Method 3 (peak B-line visibility) yielded the highest ICC (0.89), significantly more reliable than Method 1 (0.84).
No other significant differences in reliability were found between the methods.

Conclusions:

All evaluated methods for quantifying sonographic B-lines exhibit significant inter-rater reliability.
Method 3 offers superior reliability compared to Method 1 and is simpler to execute.
Method 3 is recommended for consistent and accurate assessment of extravascular lung water using sonography.