06/03/2025
HAEMORRHAGE VS INFLAMMATION…
Just because it looks like blood doesn't mean it is caused by a life threatening HAEMORRHAGE.
What do I mean by that… blood from oozing irritated tissues caused by inflammation such as post-operative inflammation or inflammatory conditions like pancreatitis can look like a life threatening haemorrhage and make you want to jump into surgery and go and find the bleeder and achieve haemostasis however you might be jumping the gun and making the wrong call.
The important point to understand here is that fluid can look like a significant bleed but actually be caused by inflammation… again what is the difference??
A significant haemorrhage generally has a packed cell volume (PCV) that is similar to the peripheral PCV whereas the PCV of an inflammatory effusion that “looks” haemorrhagic can be significantly lower than the peripheral PCV.
The only way to know is to spin your “blood appearing” sample down and determine the PCV! For me if the PCV is less than 10% then I consider it generally as inflammatory rather than hemorrhage.
The first photo is a sample that I collected from the abdomen, you can see that it looks like blood. The second photo is that same sample spun down. It has a PCV of 6%.
My assessment of this case is that this effusion is likely due to inflammation (or a disease process that causes inflammation) as opposed to a haemorrhaging blood vessel. My management process for inflammation is significantly different to haemorrhage.
Tip: You can collect another sample later and reassess the PCV, if it is increasing slowly then that might mean that a small bleed is occurring, if it is increasing rapidly, close to the peripheral PCV then that will likely mean that a larger bleed is present.