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14 Cards in this Set

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  • Back

Shock

inadequate tissue perfusion & cellular oxygenation affecting multiple organ systems

Adequate Tissue Perfusion requires

1. Blood volume.


2. Cardiac Output.


3. Vascular Bed Size

Formula for BP

BP= CO x SVR

Cardiac output formula

CO = SV x HR

Components of stroke volume

1. Preload.


2. Afterload.


3. Contractility.

Components of oxygen content

Partial pressure of oxygen,


concentration of hemoglobin

Factors that increase O2 demand

1. Increased BMR.


2. Infection/fever.


3. Increased work of organs.


4. Agitation/pain


Cellular alteration in shock

Impaired O2 delivery results in shift from Aerobic respiration to


Anaerobic respiration,


ATP is used more quickly and cell begins to run down

Cycle of shock

Inadequate bloodflow to organs leads to tissue Hypoxia, causing


the cell to switch over to Anaerobic respiration. This causes tissue Hypoxia, which leads to an accumulation of lactic acid and a fall in pH.


Causing metabolic acidosis, which leads to cardiac depression & lessens bloodflow to organs.

Body responses to shock

1. Initial stage: no visible symptoms yet


2. Compensatory stage: neural, hormonal and chemical responses


3. Progressive stage: multi-organ failure


4. Refractory stage: permanent damage, death is inevitable

Cardiogenic shock

Due to heart failure, like a heart attack. Have inability of heart to contract, leading to reduced stroke volume or heart rate and ultimately lowered cardiac output

Causes of Cardiogenic Shock

1. Acute Myocardial Infarction.


2. Severe Congestive Heart Failure


3. Cardiomyopathy.


4. Valvular Dysfunction.


5. Cardiac Tamponade.


6. P.E.


7. O.D.

Signs & Symptoms


1. C.P., S.O.B., Cold Clammy Skin.


2. Crackles, Decreased U.O.


3. Nausea, Anxiety.


4. Sense of Impending Doom.


5. Hypotension. Oliguria. Cyanosis.


6. Cool Extremities, Reduced L.O.C.


7. Sinus Tach., J.V. Distension .

Cardiogenic Shock Hemodynamics


1. BP is low.


2. CVP is high.


3. PCWP is high.


4. C.O. is low


5. SVR is high.