Elucidating the relationship between cardiac preload and renal perfusion under pneumoperitoneum.
BACKGROUND
Pneumoperitoneum is associated with a well-described decrease in renal blood flow, but it remains unclear whether a decrease in cardiac preload is responsible. Our aim was to characterize the relationship between cardiac preload and renal perfusion during pneumoperitoneum.


METHODS
Eleven pigs were submitted to three 30 minute study periods: 1) Baseline (n=11): no interventions, 2) Pneumoperitoneum (n=11): 12 mmHg CO2 pneumoperitoneum, 3) Preload Reduction: pneumoperitoneum and nitroglycerin infusion (n=8); or pneumoperitoneum and hemorrhage to a mean arterial pressure (MAP) of 40 mmHg (n=3). Echocardiographic measurements of left ventricular end-diastolic diameter (LVEDD) were used as an index of preload. Renal cortical perfusion (RCP) was measured using laser doppler flowmetry.


RESULTS
LVEDD decreased from 4.2 +/- 0.5 to 4.1 +/- 0.6 cm (p=0.02) with pneumoperitoneum and then to 4.0 +/- 0.5 cm (p=0.03) with the addition of nitroglycerin. There was no statistically significant change in RCP with pneumoperitoneum (33.5 +/- 8.4 to 28.5 +/- 8.4 ml/min/100g tissue, p=0.2), but it decreased to 18.5 +/- 11.3 ml/min/100g tissue (p=0.001) with the addition of nitroglycerin. The correlation between RCP and LVEDD was weak (0.35, p=0.003), whereas correlation between RCP and MAP was superior (R=0.59, p<0.0001).


CONCLUSIONS
While decreasing preload under extreme lab conditions also decreases RCP, simply creating a pneumoperitoneum of 12 mmHg does not. The decrease in renal blood flow associated with pneumoperitoneum is likely not solely a function of preload.
Steinberg-Bernstein Centre for Minimally Invasive Surgery, McGill University, Montreal, QC, Canada. simon.bergman@mail.mcgill.ca
Simon
S
Bergman
Arni
A
Nutting
Liane S
LS
Feldman
Melina C
MC
Vassiliou
Christopher G
CG
Andrew
Sebastian
S
Demyttenaere
Debbie
D
Woo
Franco
F
Carli
Luc
L
Jutras
Jean
J
Buthieu
Donna D
DD
Stanbridge
Gerald M
GM
Fried
D000818:Animals; D001794:Blood Pressure; D002245:Carbon Dioxide; D004452:Echocardiography; D005260:Female; D006321:Heart / Q000503:physiopathology*; D017078:Laser-Doppler Flowmetry; D011028:Pneumoperitoneum, Artificial / Q000009:adverse effects*; D012079:Renal Circulation; D013318:Stroke Volume; D013552:Swine; D016277:Ventricular Function, Left
D002245:Carbon Dioxide