The banding of the pulmonary artery (PAB) has been done previously with diverse materials. An Hydraulic Device (HD) has been designed to band, in a controlled fashion, the main pulmonary artery of animals weighing more than 18 kilograms. We introduce an HD for smaller animals.
The components of the HD are: a valve, a reservoir, a teflon tape and a silastic conector. We built an artificial silicone tube and increased it′s internal pressure with water from the baseline condition [(20 mmHg (A)] to 40 (B), 60 (C) up to 80 mmHg (D). With each of this prefixed pressures, the volume and pressure of the HD was recorded after the addition of 0.1 ml of water in the HD reservoir, until it reached 1.0 ml. We followed the preceding procedure in a canine model of PAB. By introducing water to the HD reservoir, we obtained the increase of the right ventricular systolic pressure (RVSP), the systolic pulmonary artery pressure (sPAP) and the RVSP and sPAP difference (RVSP-sPAP).
We studied 10 mongrel dogs weighing 12.6 ± 2.2 kgs. There were no complications in the construction or in the HD positioning procedure. The HD behavior with every increase of the artificial tube internal pressure is shown in Figure 1. The maximum RVSP developed with the HD was 50.3 ± 6.9 mmHg, it behavior, and the sPAP and RVSP-sPAP difference are observed in Figure 2.
The HD it′s capable of overcoming the artificial tube prefixed pressures and provoking an acute increase in RVSP.
This HD has the potential to be used in congenital disorders, particularly in ventricular preparation for surgical correction of transposition of the great vessels.
J. Gotes, None.