Sunday, August 4, 2013

Cardiogenic Shock



WHAT WENT WRONG?

A drop in blood pressure and blood flow caused by the heart’s inability to pump
blood as a result of a cardiac emergency, such as cardiac tamponade, myocardial
ischemia, myocarditis, or cardiomyopathy (a disease of the heart that deteriorates
the heart muscle). Blood pools in the left ventricle, which causes a back up of blood
into the lungs, resulting in pulmonary edema. Contractions increase to compensate
for the decreased cardiac output, causing an increase in demand for oxygen by
the heart. However, the lungs are not oxygenating the blood sufficiently due to
decreased blood flow; and therefore heart muscles are starved for oxygen.

 PROGNOSIS

Treatment needs to find a balance between improving cardiac output and reducing
oxygen needs and cardiac workload of the myocardium. This balance must be
achieved while maintaining perfusion of the heart muscle. Prognosis depends on
finding and treating the underlying cause. Cardiogenic shock requires immediate
treatment, often before the cause is known.

 HALLMARK SIGNS AND SYMPTOMS

Hypotension, because blood flow decreases below normal.
Tachycardia, because the heart is trying to pump faster to maintain adequate
blood flow to the body, or occasionally bradycardia, where the heart rate is
less than 60 beats per minute due to myocardial damage.
Arrhythmias—when the heart muscle does not have enough oxygen it
becomes irritable, making arrhythmias more likely.
Clammy skin, because oxygenation to tissues is reduced.
Drop in skin temperature because of reduced circulation as a result of
hypotension.
Urine output less than 30 ml per hour (oliguria) because the kidneys are not
being perfused.
Crackles heard in the lungs secondary to pulmonary edema, meaning fluidis
building up in lungs.
Confusion due to poor perfusion.
Distended jugular veins—sign of fluid overload, inability of heart to manage
fluid coming into heart.
Cyanosis of lips, peripheral extremities due to poor perfusion.

INTERPRETING TEST RESULTS

Chemistry—check electrolytes, kidney function to ascertain kidney perfusion;
calcium level is increased or decreased secondary to muscle contractility.
Echocardiogram—to look for ventricular rupture, pericarditis, or valve dysfunction.
Electrocardiogram:
Q-wave enlarged due to heart failure.
Elevation of ST-waves is a sign of ischemia.

TREATMENT

Treatment is based on medical support for the heart until etiology (cause) can be
determined. In cardiogenic stroke, the stroke volume and the heart rate must be increased
to keep the organs perfused. The effects of the following medications should
accomplish this.
Administer vasodilator—dilates blood vessels (arterial and venous) to decrease
the venous return to the heart and reduces the peripheral arterial resistance
(what the heart has to pump against).
Nitroprusside; nitroglycerin.
Administer adrenergic agent—to increase the heart rate and blood pressure:
epinephrine.
Administer inotropes strengthens the heart beat, improves contractions, produces
peripheral vasoconstriction:
dopamine
dobutamine
inammone
milrinone
Administer vasopressor decreases blood flow to all organs except the heart
and brain:
norepinephrine
Provide supplemental oxygen—may need to be via intubation.

DIAGNOSES

Ineffective tissue perfusion
Decreased cardiac output

INTERVENTION

Monitor vital signs—look for changes in BP, P, R.
Monitor heart sounds.
Monitor Swanz Ganz catheter is a catheter placed into the pulmonary artery
to check for pressures in the heart, vessels, and lungs.
Test capillary refill.
Monitor arterial blood gas to learn pH, acidosis or alkalosis, bicarb level.
Monitor respiratory status—due to poor perfusion, these patients are in respiratory
distress; mechanical ventilation may be needed.
Place the patient on bed rest.
 Monitor intake and output of fluids—look for adequate renal perfusion.
Without sufficient cardiac function, the patient will not have enough blood
flow to the kidneys to get adequate filtration.
Explain to the patient:
Which symptoms to be aware of and when to call the doctor.
Take rest periods.
Call the physician if there are signs of fluid overload—weight increase,
shortness of breath, fatigue, dependent edema.
Record weight each day and call the physician, nurse practitioner, or
physician assistant if there is an increase of 3 lbs (1.4 kg).
Change to a low-sodium, low-fat diet.


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