[Physiological approach to reading chest radiography. Clinical application].

Area of Science:

• Radiology
• Pulmonary Medicine
• Cardiovascular Physiology

Background:

• Chest X-ray interpretation integrates morphological and physiological data.
• Pulmonary vasculature constitutes 80% of visible lung structures, with heart and great vessel contours being recognizable.
• Understanding pulmonary circulation physiology is crucial for interpreting chest X-rays.

Purpose of the Study:

• To review current knowledge on pulmonary circulation physiology and its regulation.
• To present principles for reading chest X-rays in erect patients at end-inspiration.
• To identify main pathological patterns and diagnostic pitfalls in chest X-ray interpretation.

Main Methods:

• Review of current knowledge on pulmonary circulation physiology and regulation.
• Presentation of chest X-ray reading principles for erect patients at end-inspiration.
• Identification and discussion of common pitfalls in chest X-ray interpretation.

Main Results:

• A checklist for chest X-ray analysis includes pulmonary flow distribution, peripheral vessel size, Simon's line, vessel shape, artery/bronchus ratio, heart size, and major vessel diameters.
• Main pathological patterns discussed include increased pulmonary flow, venous and arterial hypertension, and localized blood flow changes.
• Identified pitfalls include equalization of apex/basis ratio, enlarged vascular pedicle, and enlarged azygos vein.

Conclusions:

• Accurate chest X-ray interpretation requires integrating morphological findings with an understanding of pulmonary circulation physiology.
• Systematic application of a checklist and awareness of potential pitfalls enhance diagnostic accuracy.
• The study provides a framework for interpreting chest X-rays, focusing on vascular aspects and common pathological conditions.