Hemodynamic disorders related to beating heart surgery using cardiac stabilizers: experimental study.
OBJECTIVE
To study in swine the hemodynamic changes secondary to the use of stabilizers for off-pump coronary artery bypass graft surgeries by means of both a suction device "Octopus" and a compression device (Speroni).


METHODS
Ten swine underwent median sternotomy. Monitoring of ECG, continuous cardiac output, mean arterial pressure, mean pulmonary artery pressure, mean right and left atrial pressures, and right and left ventricular diastolic pressure were performed. Stroke volume and systemic vascular resistance were calculated. Both stabilizers were studied placed on three vessels: anterior interventricular branch, posterior interventricular branch, and marginal branch of the circumflex branch. Each animal was randomly designed to application regarding the type of stabilizer and the target artery. The measurements were carried out 5 minutes before and after the stabilizer application.


RESULTS
In the anterior interventricular branch changes have occurred only with the compression device, thus reducing cardiac output, stroke volume, and mean arterial pressure, but increasing the systemic vascular resistance. In the posterior interventricular branch changes have occurred with the compression device (Speroni), reducing cardiac output and stroke volume, but increasing the heart rate. With the suction device (octopus) there was an increase of both heart rate and systemic vascular resistance, but a decrease in stroke volume. In the marginal branch of the circumflex branch there was a decrease of cardiac output, stroke volume, and mean arterial pressure with both stabilizers. Also, there was a decrease in the mean pulmonary artery pressure and an increase in the mean right atrial pressure with the compression device (Speroni).


CONCLUSIONS
Both stabilizers have caused hemodynamic changes. The compression device (Speroni) is more associated with changes than the suction device (Octopus).
Oliveira
Pedro Paulo Martins de
PP
Faculdade de Ciências Médicas - UNICAMP, Cirurgião Cardiovascular do Hospital das Clínicas da UNICAMP. ppaulo@fcm.unicamp.br
Braile
Domingo Marcolino
DM
Vieira
Reinaldo Wilson
RW
Petrucci Junior
Orlando
O
Silveira Filho
Lindemberg Mota
LM
Vilarinho
Karlos Alexandre de Sousa
KA
Barbosa
Elaine Soraia de Oliveira
ES
Antunes
Nilson
N
D000818:Animals; D016275:Atrial Function / Q000502:physiology; D001794:Blood Pressure / Q000502:physiology; D047549:Coronary Artery Bypass, Off-Pump / Q000379:methods*; D003331:Coronary Vessels / Q000502:physiology*; D005260:Female; D006353:Heart-Assist Devices; D006439:Hemodynamics / Q000502:physiology*; D023421:Models, Animal; D011651:Pulmonary Artery / Q000502:physiology*; D013318:Stroke Volume / Q000502:physiology; D013396:Suction / Q000295:instrumentation; D013552:Swine; D013997:Time Factors; D014655:Vascular Resistance / Q000502:physiology; D017725:Ventricular Pressure / Q000502:physiology