Electrocardiogram
An electrocardiogram helps establishing the exact diagnosis and guides treatment, it may reveal:
Radiology
Echocardiography may show poor ventricular function, signs of PED, ventricular septal rupture (VSR), an obstructed outflow tract or cardiomyopathy.
Swan-ganz catheter
The Swan-ganz catheter or Pulmonary artery catheter may assist in the diagnosis by providing information on the hemodynamics.
Biopsy
In case of suspected cardiomyopathy a biopsy of heart muscle may be needed to make a definite diagnosis. but biopsy should only be done when third space is suspected
Further Reading
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"Cardiogenic shock"
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