week 9 - LVF managment Flashcards
what is starlings law?
the ability of the heart to change force of contraction and therefore stroke volume in response to changes in venous return. increased return increases strech and increased force of contraction and stroke volume
what are starlings forces?
the [passive exchange of fluid between the micirculation and the intersistal fluid. these forces determin directionalty of net fluid movement between two different compartments and also the rate of fluid exhcange
what is hydrostatic pressure?
the physical force of fluid against their enclosing barriers. hihger in blood than intersital fluid
what is ontonic pressure?
osmotic pressure generated by the presence of proteins in circulatory system. plasma prteins cant cross capilary barriers - hogher concerntration in blood than intersistal space
what is the basic pathophysiology of cardiogenic pulmoanry odeama?
left ventricular dysfucntion
build up of blood in left ventricle - right atrium - pulmoary circulation
increased pulmonary capilary pressure/hypertension
increased hydrostatic pressure
increased fluid into interstital space
pulmonary odeam
what is the treatment for pulmary odeama?
position- upright- fluid drainage
oxygen - if hypoxic - decrease hypoxia, myocardial ischmeai and sympathetic response - which can worsed APO
GTN - reduce preload and afterload reucinf pressures and allowing adeqaute ejection
how does GTN work?
vasodialter
what does CPAP do for APO paitents?
continuous positve pressure during resp cycle. increased PEEP limist alveoli from collapsing
what are the pros and cons for CPAP?
pros- increased pressue keeps alveoli open allwoing more gas exhange and decreases work of breath -spliniting
increased intrathoracic pressue decreased proload and workload on LV
cons-
decreases BP and possible barotrauma (TNT) due to increased intrathoracic pressure
