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

Abstract

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.

Comparison of common perioperative blood loss estimation techniques: a systematic review and meta-analysis

“…Thus, three different formulas are used in the literature to calculate the total blood volume of patients. The Moore formula [75,76], which, like Nadler's formula [75][76][77][78][79][80][81] takes into account height, weight and sex for the calculation, and the ICSH formula [75,76], which uses gender and body surface area to calculate the total blood volume. The formula according to Nadler was used most often in the literature.…”

Techniques for blood loss estimation in major non-cardiac surgery: a systematic review and meta-analysis

“…7 Given the strong prognostic influence of EBL on postoperative outcomes, despite the heterogeneity and possible inaccuracy in its measurement, standard and robust methods for estimation are required to guide clinical care and research. In addition to visual estimation, 8,9 other methods currently employed worldwide include formula-based estimation, incorporating changes in hemoglobin or hematocrit, 10,11 and gravimetric-based estimation incorporating changes in dry and wet weight of surgical sponges, 12,13 among others.…”

“…Of the studies, nine were from North America, 8,11,17,[21][22][23][24][25][26] 11 were from Europe, 10,12,13,[27][28][29][30][31][32][33][34] and four were from Asia. 9,[35][36][37] Nine studies were published before 2000, 11,21,25,27,29,30,32,35,38 two studies were published between 2000 and 2009, 8,33 and 14 studies were published in 2010 or later.…”

“…9,[35][36][37] Nine studies were published before 2000, 11,21,25,27,29,30,32,35,38 two studies were published between 2000 and 2009, 8,33 and 14 studies were published in 2010 or later. 10,12,13,17,[22][23][24]26,28,34,36,37,39 The most commonly studied operative procedures were orthopedic surgery (nine studies, 1,596 patients), 13,23,26,28,30,33,36,37,39 general surgery (five studies, 687 patients), 17,21,22,27,38 urology (four studies, 507 patients), 8,11,12,31 and mixed (three studies, 336 patients). 25,34,35 Individual study characteristics are presented in eAppendix 3.…”

“…We identified 12 studies [8][9][10][11]17,23,26,[31][32][33]36,37 involving 2,225 patients that compared visual and formula-based estimation techniques. Estimated blood loss values derived from visual techniques were lower than those derived from formula-based techniques, a finding observed in 12 of 13 (92%) studies.…”