The Parasternal Long Axis View in Isolation: Is it Good Enough?

Area of Science:

• Cardiology
• Medical Imaging
• Point-of-Care Ultrasound

Background:

• Focused cardiac ultrasound (FOCUS) is essential for bedside patient evaluation.
• Limitations of FOCUS include patient habitus, sonographer skill, and examination time.

Purpose of the Study:

• To assess the diagnostic accuracy of the parasternal long axis (PSLA) view alone.
• To compare PSLA view diagnostic capabilities against a full four-view FOCUS examination.
• To identify pericardial effusion, left ventricular (LV) dysfunction, and right ventricular (RV) dilatation using the PSLA view.

Main Methods:

• Retrospective analysis of 100 FOCUS examinations.
• Blinded and randomized review of images by point-of-care ultrasound faculty.
• Comparison of PSLA view findings against a four-view FOCUS examination as the criterion standard.
• Calculation of sensitivity and specificity for key cardiac conditions.

Main Results:

• The PSLA view showed 81% sensitivity and 98% specificity for pericardial effusion.
• It demonstrated 100% sensitivity and 91% specificity for LV dysfunction.
• For RV dilatation, sensitivity was 71% and specificity was 99%.
• All moderate to large pericardial effusions were correctly identified.

Conclusions:

• The PSLA view is highly sensitive and specific for LV dysfunction and moderate to large pericardial effusions.
• It is highly specific but only moderately sensitive for RV dilatation.
• The PSLA view offers a valuable, efficient alternative for specific cardiac assessments.