Fig. 1

Pulmonary artery cannulation. A Wire was inserted into a catheter, and the end of the catheter was bent. B Catheter after thermal modification; C guide wire was inserted into the catheter to make the end of the catheter become 90°; D guide wire was pulled out, and the end of the catheter was bent back to 180°; E catheter was placed in the right ventricle; F monitor depicted a right ventricular waveform; G catheter was laid into the pulmonary artery; H typical pulmonary artery pressure waveform