Squatting phenomenon refers to a special forced body position, mainly seen in children with congenital tetralogy of Fallot, which is a common congenital heart disease, so what auxiliary tests should be used to confirm the diagnosis of squatting phenomenon? The following will give you a detailed introduction. 1.X-ray examination The lung field is abnormally clear, the arc of the common pulmonary artery trunk is inconspicuous or concave, the right ventricle is enlarged, the apical part of the heart is upward, and the heart is shadowed in a wooden shoe shape (with a transverse rectangle) on the posterior anterior film. The right aortic arch is visible in nearly 1/4 of patients. The electrocardiogram shows right ventricular hypertrophy and strain, with significantly increased R waves and inverted T waves in all leads of the right precordial region. In some patients, the P waves in the standard leads and the right precordial leads are high and sharp, indicating right atrial hypertrophy. The electrocardiographic axis is right-sided. 3.Echocardiography The examination shows enlargement of the aortic root, which moves forward and rides over the ventricular septum. The continuity between the anterior wall of the aorta and the ventricular septum is interrupted, and the septal echogenicity is lost there, while the posterior wall of the aorta and the mitral valve remain continuous. The right ventricle is hypertrophied, and its outflow tract, pulmonary valve or pulmonary artery inner diameter is narrowed. Ultrasonography can also show a right-to-left shunt from the right ventricle to the aorta. Magnetic resonance computed tomography shows an enlarged ascending aorta riding over the ventricular septum, which is defective, a small common pulmonary artery trunk, stenosis of the right ventricular funnel, and stenosis of the pulmonary valve annulus.