Convert Wood units to dynes (dyn·s/cm⁵) for PVR or SVR, or convert dynes back to Wood units, using the standard factor 1 WU = 80 dyn·s/cm⁵.
Quick Overview
Wood units (WU) and dyn·s/cm5 express the same hemodynamic resistance using different unit systems.
- 1 WU = 80 dyn·s/cm5
- 2 WU = 160 dyn·s/cm5
- 3 WU = 240 dyn·s/cm5
- 5 WU = 400 dyn·s/cm5
- 10 WU = 800 dyn·s/cm5
The standard clinical conversion uses 80 for unindexed pulmonary or systemic vascular resistance. This is a unit conversion, not a clinical interpretation or a conversion between indexed and unindexed resistance.
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Wood Units to Dyn·s/cm5 Formula
The following formula is used to convert Wood units to dyn·s/cm5.
Variables:
- D is the resistance in dyn·s/cm5
- WU is the resistance in Wood units
- 80 is the standard clinical conversion factor, rounded from the underlying pressure-unit conversion
To convert Wood units to dyn·s/cm5, multiply the value in Wood units by 80.
Wood Units to Dyn·s/cm5 Conversion Table
The table below shows common Wood unit values and their equivalent dyn·s/cm5 values.
| Wood Units (WU) | Dyn·s/cm5 |
|---|---|
| 1 | 80 |
| 2 | 160 |
| 3 | 240 |
| 4 | 320 |
| 5 | 400 |
| 10 | 800 |
What Are Wood Units and Dyn·s/cm5?
Wood units and dyn·s/cm5 are two different ways of expressing vascular resistance in hemodynamics. Wood units are often used clinically because they are simpler to calculate and interpret at the bedside. Dyn·s/cm5 are a more traditional unit often seen in textbooks, research articles, and older catheterization reports. Both units describe the same physical quantity. Clinical calculations conventionally use 1 WU = 80 dyn·s/cm5; the factor is rounded from the underlying pressure-unit conversion.
Because the conversion is fixed, clinicians and students can move easily between the two systems. For example, pulmonary vascular resistance and systemic vascular resistance can each be reported in either unit without changing the underlying physiologic meaning.
How to Convert Wood Units to Dyn·s/cm5?
The following steps outline how to convert Wood units to dyn·s/cm5.
- First, determine the vascular resistance value in Wood units.
- Next, use the conversion factor of 80 dyn·s/cm5 per Wood unit.
- Multiply the Wood units value by 80 to calculate the resistance in dyn·s/cm5.
- After calculating the result, verify your answer with the converter above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Wood Units (WU) = 3
Dyn·s/cm5 = 3 × 80 = 240
So, a resistance of 3 Wood units is equal to 240 dyn·s/cm5.
