[Modification of a hydraulic device for controlled banding of the trunk of the pulmonary artery in dogs].
Different congenital or acquired diseases increase the right ventricular systolic pressure. The elevation is achieved by pulmonary artery banding with linen tape or hydraulic devices. We introduce a new hydraulic device to be used in experimental subjects of less than 15 kilograms.


METHODS
An experimental laboratory phase was conducted. In this phase, the hydraulic devices were tested against pressures as high as 80 mm Hg; later on the hydraulic devices were placed on the dogs' main pulmonary artery; the right ventricular systolic pressure, pulmonary artery pressure, and their differences were obtained. The values are expressed in average +/- standard deviation.


RESULTS
The average weight of the dogs was 12.6 +/- 2.2 kg. The average diameter found in the main pulmonary artery was 12.4 +/- 1.4 mm and 27.5 +/- 1.6 mm length. Right ventricular systolic pressure of basal condition to maximum pressure obtained was 25.5 +/- 1.9 mm Hg vs 50.3 +/- 6.9 mm Hg, p < 0.0001; pulmonary artery pressures under the same conditions were 24.7 +/- 2 mm Hg vs 21.5 +/- 6.9 mm Hg, p < 0.043; and the differences between them were 0.8 +/- 1.4 mm Hg vs 28.8 +/- 4.2 mm Hg, p < 0.0001, developed by the hydraulic device respectively.


CONCLUSIONS
The hydraulic device allows attaining a controlled acute increase in right ventricular systolic pressure.
Santos Martínez
Luis Efrén
LE
Instituto Nacional de Cardiologia "Ignacio Chávez", Departamento de Cardioneumología, (INCICH Juan Badiano No. 1, Col. Sección XVI, Tlalpan 14080, México DF. sanlui@cardiologia.org.mx
Gotés
José
J
Flores
Pedro
P
Tena
Carlos
C
Graullera
Verónica
V
Pulido
Tomás
T
Bautista
Edgar
E
Infante
Oscar
O
Martínez Guerra
María Luisa
ML
Castañón
Alicia
A
Ramírez
Samuel
S
Soule
Mauricio
M
Sandoval Zárate
Julio
J
D000818:Animals; D006348:Cardiac Surgical Procedures / Q000295:instrumentation* / Q000379:methods; D004285:Dogs; D004867:Equipment Design; D008026:Ligation / Q000295:instrumentation / Q000379:methods; D011651:Pulmonary Artery / Q000601:surgery*