A practical method for determining the amount of blood passing over during direct transfusion / E. Libman and R. Ottenberg.

  • Libman, Emanuel, 1872-1946.
Date:
1914
Catalogue details

Licence: In copyright

Credit: A practical method for determining the amount of blood passing over during direct transfusion / E. Libman and R. Ottenberg. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    12/14 (page 10)
    tliese cases, of course, tliere is no lienioglobin rise at tlie time of transfusion. In over one hundred cases in whicli we have observed tlie hemoglobin closely, there were only four cases of this kind. SUirM.VUY 1. It is as necessarv to control the amount of blood transferred during a direct transfusion ns it is to con- trol the dosage in any other therai)cutic procedure. 2. A simple arithmetical formula is given by which it is ])Ossible to calculate how much rise in the percentage of hemoglobin will be obtained bv transfusion of a given volume of blood. 'I'he formula is: (I’lilii'nt's liliHxl wi'lglit X |»ilii Ill's lii*ii:»Kliiblii ix‘rci'iil.i + iwi'liilit of hlooil tniiisfiisi-il X ilomir's lll•lllO|;lolltIl por ci'iil.) =II('ningIobin por I'l'iit. rciiclipd. I’lltlnnt's blood wi'lsllt + wi'lclit triinsfiisod (in jiomids) The patient's blood-weight is estimated as one-nine- teenth of the body-weight. d. 'I'he amount to he transfused may he decided arbitrarily, with regard to the patient’s need, or with regard to the donor's ability to give up blood. 4. It is always safe to take one-fourth of the donor's blood; it is often safe to take as much as one-third of the donor's blood volume, provided the transfusion is not done too rapidly. 5. 'riiough the danger of overloading the circulatory .‘system of the ])alient is not as great as has been thought, yet lu'obably it is not wise to add more than one-fourth, or at most one-third, as much blood as a person of the ])atient’s weight normally has. This needs to be taken into account only in chihlren or very .«mall adults, trans- fused from large donors, becau.se in most cases a single donor will collapse before he can give enough blood to embarrass the circulation of a full-grown adult patient. If inore than one donor is used this part of the calcu- lation becomes of great importance. (). lly means of exact weighings of either donor or patient or both, before and after transfusion, in a series of eleven cases, we have shown that the formula which we give corresponds quite closely to the actual amount of blood transfused.