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Related Experiment Videos

The midclavicular line: a wandering landmark.

C D Naylor, D G McCormack, S N Sullivan

    CMAJ : Canadian Medical Association Journal = Journal De L'Association Medicale Canadienne
    |January 1, 1987
    PubMed
    Summary

    The midclavicular line (MCL) shows significant interobserver variation in clinical practice, especially in obese patients. This variability limits its reliability for assessing liver size and cardiac apex beat localization.

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    Area of Science:

    • Clinical anatomy
    • Medical imaging interpretation
    • Patient assessment

    Background:

    • The midclavicular line (MCL) is a standard anatomical landmark used in clinical practice.
    • It serves as a reference for assessing liver size and locating the cardiac apex beat.
    • Previous studies have not extensively evaluated the reliability of MCL identification among clinicians.

    Purpose of the Study:

    • To investigate the interobserver variability in locating the midclavicular line (MCL).
    • To assess the impact of patient build, specifically obesity, on MCL localization accuracy.
    • To evaluate potential differences in variability between consultant and house staff physicians.

    Main Methods:

    • Twenty clinicians estimated the distance from the midline to the MCL in three different subjects.
    • Subjects included two individuals of normal build and one obese individual.
    • Statistical analysis was performed to compare variations in MCL estimation.

    Main Results:

    • Substantial interobserver variation was observed in locating the MCL, with distances varying up to 10 cm.
    • Significantly greater variation was found in obese subjects compared to normal-build subjects (p = 0.004).
    • No significant difference in variation was noted between consultants and house staff.

    Conclusions:

    • The midclavicular line (MCL) demonstrates considerable unreliability as a clinical reference point due to interobserver variability.
    • Obesity exacerbates the inaccuracy in MCL localization, posing challenges for clinical assessments.
    • The findings highlight the limitations of the MCL and suggest a need for alternative or refined anatomical reference methods.

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