Decreasing the risk of pulmonary artery rupture with a pressure relief balloon.

A pressure relief balloon has been recommended as one way to decrease catheter-related pulmonary artery rupture (PAR). There are approximately 1 to 2 PARs per 1,000 pulmonary artery catheter (PAC) insertions, resulting in significant morbidity and mortality. A new pressure relief balloon (PRB) introduced by Biosensors International (Singapore) was studied for its efficacy in increasing safety during PAC flotation balloon (FB) inflations. Ten human placentae were used for the experiment. The Biosensors PACs and the commonly used Baxter-Edwards (Irvine, CA) catheters were placed in placental veins and their FBs were gradually inflated with a maximum of 1.5 mL of air. Data revealed that PRBs consistently inflated when resistance was met by FBs and inflation pressure reached 1,000 mmHg. When PRBs were removed, the FBs inflated asymmetrically and distended beyond the catheter lumen or protruded through the vessel wall, causing bleeding upon deflation. Without the PRB, pressures reached up to 1,700 mmHg. In addition, the PRB gave visual evidence of resistance to the FB. In conclusion, the PRB is a safety device that limits overinflation of the distal PAC balloon, thus preventing vessel rupture. The device deserves serious consideration and outcome analysis.