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Plethysmography

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Plethysmography

Overview Risks Results

Plethysmography

Definition:

This test measures the systolic blood pressure (maximum pressure exerted when the heart contracts) of a leg compared with that of an arm. The test is usually performed to rule out blockages in the arms or legs (usually legs).

See also blood flow studies.

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Alternative Names:
Arterial plethysmography

How the test is performed:

This test may be done in the health care provider's office or in a hospital. You are placed in a partially propped-up position. Three blood pressure cuffs are wrapped snugly around the arm and leg. They are inflated to 65 mmHg (millimeters mercury), and a pulse volume recorder (plethysmograph) measures the pulse waves from each cuff.

Any differences between the pulse waves are noted. If there is a reduction in any of the waves compared with the others, it may indicate a blockage. When the test is complete, the blood pressure cuffs are removed.

How to prepare for the test:

Refrain from smoking at least 30 minutes before the test. Remove all clothing from the arm and legs.

Infants and children:

The preparation a parent can provide for this procedure depends on the child's age, previous experiences, and level of trust. For specific information regarding how you can prepare your child, see the following:

• infant test or procedure preparation (birth to 1 year)
• toddler test or procedure preparation (1 to 3 years)
• preschooler test or procedure preparation (3 to 6 years)
• schoolage test or procedure preparation (6 to 12 years)
• adolescent test or procedure preparation (12 to 18 years)

How the test will feel:

There should be minimal discomfort with this test. The pressure of the blood pressure cuff is all you should feel.

Why the test is performed:

The test is done to help rule out arterial blockages in the arms or legs.

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