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https://www.clinicaltrials.gov/ct2/show/NCT00462839
Apr 19, 2007 · Post-partum hemorrhage (PPH) is defined as blood loss greater than 500 mL after vaginal delivery. Delayed diagnosis of PPH is a major cause of maternal morbidity and mortality. Obstetricians estimate blood loss at delivery by visual estimation of blood collected in the obstetric drapes. Blood is often mixed with urine and surgical sponges.
https://www.cochrane.org/CD010980/PREG_methods-estimating-blood-loss-after-vaginal-birth-improve-maternal-outcomes
Sep 13, 2018 · A more precise measurement of blood loss is haemoglobin concentration (Hb) in venous blood sampling and spectrophotometry. With the dye dilution technique, a known quantity of dye is injected into the vein and its plasmatic concentration is monitored after the uterus stops bleeding.
https://www.acog.org/en/Clinical/Clinical%20Guidance/Committee%20Opinion/Articles/2019/12/Quantitative%20Blood%20Loss%20in%20Obstetric%20Hemorrhage
Studies that have evaluated factors associated with identification and treatment of postpartum hemorrhage have found that imprecise health care provider estimation of actual blood loss during birth and the immediate postpartum period is a leading cause of delayed response to hemorrhage 10 11 12 13.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5003499/
May 03, 2016 · 1. Background. Visual estimation is the most common method to estimate intraoperative blood loss, but it is not the most accurate (1). Estimating blood loss might be difficult, especially if most of the blood is absorbed by surgical gauze and not collected in the suction bottle (2).Author: Emran Ali Algadiem, Abdulmohsen Ali Aleisa, Huda Ibrahim Alsubaie, Noora Radhi Buhlaiqah, Jihad Bagi...
https://www.crisis-medicine.com/visual-estimation-of-blood-loss/
Dec 15, 2017 · While most paramedics report a visual estimation of blood loss at the scene of trauma patients, half don’t believe their own estimation is accurate. Across multiple studies, there is no correlation between the accuracy of the visual estimation of blood loss, the level of training, or years of EMS experience.
https://www.jognn.org/article/S0884-2175(15)31184-9/fulltext
Accurate quantification of blood loss is an essential skill necessary to prevent maternal morbidity and mortality associated with obstetric hemorrhage. Visual estimation of blood has been consistently shown to be extremely inaccurate. The nurse plays a pivotal role in quantifying blood loss after birth, recognizing triggers, mobilizing needed interventions, and providing essential communication.Author: Kristi T. Gabel, Tracy A. Weeber
https://www.jognn.org/article/S0884-2175(15)31768-8/fulltext
Quantification of Blood Loss (QBL) 1. Begin the process of QBL when the amniotic membranes are ruptured or after the infant is born. 2. Suction and measure all amniotic fluid within the suction canister of collected fluid... 3. After delivery of the placenta, measure the amount of blood lost in ...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4971452/
In each category, after 100 mL of blood loss, visual estimation also showed an underestimation of blood loss in the majority of cases. Overall, only 34.6% of patients were diagnosed with immediate PPH.Author: Tripop Lertbunnaphong, Numporn Lapthanapat, Jarunee Leetheeragul, Pussara Hakularb, Amporn Ownon
http://applications.emro.who.int/imemrf/AJAIC/2006_9_1_25.pdf
Bourke & Smith (15).The results showed that visual estimation of blood loss gave the lowest estimated value while the calculation gave the highest estimate of blood loss. Anesthetists gave more accurate visual estimation of blood loss than obstetricians, while scrub nurses gave the lowest estimation. Past history of cs ,breech presentation, placenta previa and manual separation of the placenta were associated with more blood loss during …
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