Abstract
Background: Hypotensision during induction of anesthesia is frequently observed in patients undergoing coronary artery bypass grafting (CABG). On the other hand, a reduction of intravascular volume has been described in patients suffering from cardiovascular diseases. The aim of this study is to evaluate the influence of intrinsic volume deficit on the extent of arterial hypotension during induction of anesthesia. Therefore, according to the measured intravascular volume, the examined patients were divided into a normovolemic and a hypovolemic group. The hemodynamic changes have been compared between these two groups. Methods: Thirty-eight patients with normal left-ventricular function scheduled for CABG were investigated. Blood volume was calculated from hematocrit and plasma volume determined by the dye- dilution method with Indocyanine-green (ICG). According to the measured blood volumes the patients were divided into a hypovolemic (HV) and a normovolemic (NV) group of at least 13 patients per group. Twelve patients with intermediate blood volumes were not included in the statistical evaluation. Hemodynamic data were measured three times: before and after induction of anesthesia as well as after endotracheal intubation. Results: Due to the division of the patients, body weight (BW) indexed blood volume (mean ± SD) was 68.5 ± 3.73 ml · kg-1 in the NV group and 54.8 ± 4.86 ml · kg-1 in the HV group (p < 0.001). At all measurements, heart rate was significantly lower and pulmonary capillary wedge pressure, pulmonary artery pressure, and central venous pressure significantly higher in the NV group than in the HV group. In contrast, the values of mean arterial pressure (MAP), systemic vascular resistance (SVR) and cardiac index (CI) did not differ significantly between both groups at any time. Correlation analysis revealed that the extent of arterial hypotension was mainly influenced from MAP before induction of anesthesia (r = 0.6674, p < 0.001). Conclusions: There is no difference in the decrease of MAP after induction of anesthesia between the hypovolemic and the normovolemic group. Arterial hypotension is caused mainly by pre-induction MAP which should be noted for treatment.
Translated title of the contribution | Intravascular volume deficit and arterial hypotension during induction of anaesthesia in patients with CABG and normal left ventricular function |
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Original language | German |
Journal | Zeitschrift fur Herz-, Thorax- und Gefäßchirurgie |
Volume | 12 |
Issue number | 1 |
Pages (from-to) | 8-15 |
Number of pages | 8 |
ISSN | 0930-9225 |
DOIs | |
Publication status | Published - 1998 |