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6 Cards in this Set

  • Front
  • Back

Plethysmography measures

Volume changes

DC Coupling

Direct current

Electric voltage that is either positive or negative

Current flows in only 1 direction (battery)

Detects slower changes in blood content

Used for venous study

AC Coupling

Alternating current

Electric voltage that reverses polarity(positive or negative) 60 times a second

Current flows in both directions(wall plugs)

Detects fast changes in blood content

Used for arterial studies

Pulsatile venous flow

Fluid overload


Tricuspid regurgitation

Budd-Chiari syndrome

Results from hepatic vein occlusion

Primary site of obstruction may be hepatic vein, sinusoids or IVC

Budd-chiari clinical findings

Hepatomegaly, abdominal pain, sudden onset of ascites