Ch. 13 Shock Flashcards
Shock
inadequate cellular perfusion
Perfusion
circulation of blood to tissues in adequate amount to meet cell needs
Alveolar diffusion
O2 and CO2 pass through walls of alveoli through diffusion
Shock overview
-In poor perfusion, Transport of CO2 becomes impaired, resulting in buildup of waste products which could damage cells. To protect against this, body compensates by directing blood away from organs tolerant of shock (skin, intestines), to deliver to heart, brain, lungs.
Shock Triangle in depth
-Heart(pump): can’t move enough blood to support perfusion
-Blood vessel(pipe): rapid dilation means normal blood volume can’t fill the system and provide good perfusion
-Blood(fluid): blood or plasma loss means there isn’t enough fluid to support perfusion
Capillary hydrostatic pressure
pressure within capillary beds
-force fluids through capillary walls
Interstitial fluid hydrostatic pressure
pressure around capillary beds and between cells
-pushes fluid back into cells
myocardial contractility
ability of heart to contract
pericardial effusion
collection of fluid between pericardial sac and myocardium.
-If big enough, can prevent ventricles from filling with blood (cardiac tamponade)
Beck triad
Signs of cardiac tamponade
JVD, muffled heart sounds, narrowing blood pressures
pulmonary embolism
blood clot that occurs in pulmonary arteries and blocks blood flow through the lungs
Anaphylactic shock symptoms
Table 13-2 pg 539
SKin
Circulatory
Respiratory
Other
Hypovolemic shock causes
-Hemmorhagic
Thermal burns
Crushing injuries (excessive swelling)-loss of blood and plasma into injured tissues
-dehydration
Progression of shock
Table 13-3 pg 540
O2
Inadequate ventilation may be a major factor in shock development.
Administer high flow O2
