Influence of pregnancy on one-compartmental bio-metric blood loss calculations after cesarean section and gynaecological surgery

One-compartmental biometric blood loss calculation after cesarean section

Blood loss during cesarean section was calculated based on post-operative decrement of hemoglobin (Hb) and hematocrit (Hct) level. The model used for pregnant women was previously validated for non-pregnant women who underwent gynecological surgery. 1,068 pregnant women who underwent cesarean section and 517 women who underwent gynecological surgery were included in the study. Regression lines between collected (x) and calculated (y) blood loss in pregnant women (y = 0.164 + 0.602x) and non-pregnant (y = 0.255 + 0.750x) women were statistically parallel. This study confirmed the applicability of one-compartmental model based on the drop in Hb levels for blood loss calculations for both gynecological surgery and cesarean section. Improved methods for calculating blood loss, V after cesarean section as V = [0.0115 × body weight (kg) × ln (preoperative Hb/postoperative Hb)] + [0.1905 × height³ (m) × ln (preoperative Hb/postoperative Hb)] + 0.3158 and after gynecological surgery V = [0.004 × body weight (kg) × ln (preoperative Hb/postoperative Hb)] + [0.4624 × height ³(m) × ln (preoperative Hb/postoperative Hb)] + 0.0472 were suggested.

Computerized evaluation of mean residence times in multicompartmental linear system and pharmacokinetics

Deriving mean residence times (MRTs) is an important task both in pharmacokinetics and in multicompartmental linear systems. Taking as starting point the analysis of MRTs in open or closed (Garcia-Meseguer et al., Bull Math Biol 2003, 65, 279) multicompartmental linear systems, we implement a versatile software, using the Visual Basic 6.0 language for MS-Windows, that is easy to use and with a user-friendly format for the input of data and the output of results. For any multicompartmental linear system of up to 512 compartments, whether closed or open, with traps or without traps and with zero input in one or more of the compartments, this software allows the user to obtain the symbolic expressions, in the most simplified form, and/or the numerical values of the MRTs in any of its compartments, in the entire system or in a part of the system. As far as we known from the literature, such a software has not been implemented before. The advantage of the present software is that it reduces on the work time needed and minimizes the human errors that are frequent in compartmental systems even those that are relatively staightforward. The software bioCelTer, along with instructions, can be downloaded from http://oretano.iele-ab.uclm.es/~fgarcia/bioCelTer/.

Application of one-compartmental bio-metric blood loss calculations with transfused blood volume taken into account after aneurysmectomy

Blood loss can be measured directly and indirectly. The latter reflects blood loss through the assessment of hemoglobin level. Thus aim of this study was to determine the applicability of the drop in hemoglobin levels blood loss calculation when transfused blood volume is taken into account on the patients who underwent aneurysmectomy and to estimate whether this model is applicable on geriatric population. In this study, 14 patients were included and their blood loss was calculated based on hemoglobin concentration. Linear correlation (y = 0.18467 + 1.19315·x) with high correlation coefficient (r = 0.90809) was found between calculated and collected blood loss only if transfused blood volume was taken into account. The coefficient of the regression slope for the blood volume measured during surgery and the calculated blood loss in eight patients ≤65 years (y = 0.90866 + 0.86296·x) and six patients >65 years (y = 0.0299 + 1.32707·x) did not show any significant difference. The applicability of the indirect measurement of surgical blood loss, when transfused blood volume was taken into account, was demonstrated in both populations, in the age of 65 and less and in the age over 65 years after aneurysmectomy.