[Comparison of vascular width and accuracy in the subjective assessment of pulmonary circulation in the roentgen picture of children with left-right shunts]

Area of Science:

• Pediatric Cardiology
• Diagnostic Imaging
• Hemodynamics

Background:

• Left-right shunt is a critical congenital heart defect.
• Accurate measurement of pulmonary blood flow is essential for diagnosis.
• Subjective assessment of vascular changes can be unreliable.

Purpose of the Study:

• To establish a comparative relationship between pulmonary flow measurement accuracy and vascular widening in children with left-right shunt.
• To evaluate the diagnostic accuracy of subjective estimations by investigators.
• To compare subjective assessments with objective hemodynamic values.

Main Methods:

• Compared vascular diameters (right descending pulmonary artery, right upper lobal vein, peripheral vessels) in 72 children with left-right shunt and 143 healthy controls.
• Employed discrimination analysis to compare measurements.
• Assessed subjective estimations by 4 investigators against hemodynamic values.

Main Results:

• Accuracy ranged from 65-100% when the right descending pulmonary artery widened by 2.6 mm.
• Accuracy ranged from 79-95% when the mean vascular width in the right upper field increased by 0.7 mm.
• Accuracy ranged from 83-94% when the mean vascular width in the right lower field increased by 0.6 mm.
• Investigator judgment was influenced by different vessels.

Conclusions:

• Objective measurement of pulmonary vascular widening provides accurate diagnostic information for left-right shunt.
• Specific thresholds for vascular diameter increase correlate with high diagnostic accuracy.
• Standardized measurement protocols can improve diagnostic reliability in pediatric cardiology.