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Plethysmography |
| Definition: |
This test measures the systolic blood pressure (maximum pressure exerted when the heart contracts) of a leg compared to the arm. The test is usually performed to rule out blockages in the arms or legs (usually legs). See also blood flow studies. |
| 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:
|
| 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.
|
| Normal Values: |
| There should be less than 20 mmHg difference in the systolic blood pressure of the leg compared to the arm.
|
| What abnormal results mean: |
| Abnormal results may indicate arterial occlusive disease, trauma to the arteries, small vessel diabetic changes, blood clots, and vascular diseases. Additional conditions under which the test may be performed: |
| What the risks are: |
| There are no risks associated with this test. |
| Special considerations: |
| The test is not as accurate as an arteriography. This may be done for seriously ill patients who cannot be transported to the arteriography laboratory. |
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