Haemodynamic Disorders Flashcards
define ‘extravasation’
where increased BP causes vessel walls to become leaky
What does hydrostatic pressure cause?
Fluid to be driven OUT of capillary into tissues
What is colloid osmotic pressure/oncotic pressure?
Pressure that pulls fluid back into vessels. linked with protein concentrations (e.g. albumin concs)
define ‘oedema’
abnormal increased fluid in interstitial tissue space
What would increased hydrostatic pressure cause and name a reason for it occuring.
It would cause oedema. Caused by heart failure or localised in limbs by something such as a DVT
What is anasarca?
Oedema caused by malnutrition - not enough protein content in plasma so causes oedema.
define haemorrhage
extravasation of blood (not just fluid) due to vessel rupture
What percentage of blood does someone need to lose to be classified as haveing hypovolemic shock
More than 20%
What is petechiae and what causes it?
minute haemorrhages (1-2mm) of skin and mucosa. caused by thrombocytopenia, clotting factor deficiency or increased pressure in capillaries
What is pupura and what causes it?
small haemorrhage (3-5mm) usually due to trauma or vasculitis
define ecchymosis/bruises
subcutaneous haematoma
Define thrombosis
formation of blood clot on vessel wall.
Define embolism
solid, liquid or gaseous mass carried in the blood to a site distant from the point of origin. Most of time clinically you see thromboembolisms
What do you call an arterial thrombi that does not occlude a vessel?
Mural thrombi
what do you call a thrombi that blocks a vessel?
Occlusive thrombi