Primary Pulmonary Hypertension - Six Minute Walk Distance (6MWD) Test

 

Parameters:

(1) total distance walked in meters

(2) change in arterial oxygen saturation in percent

 

change in arterial oxygen saturation in percent =

= (oxygen saturation at baseline in percent) - (oxygen saturation at maximum distance)

 

Parameter	Finding	Points
total distance walked	>= 332 meters	0
	< 332 meters	1
change in oxygen saturation	< 9%	0
	>= 10%	1

 

where:

• Miyamoto et al identified <= 300 meters as the cutoff for increased mortality.

 

number of prognostic factors =

= SUM(points for the 2 parameters)

 

Interpretation:

• minimum score: 0

• maximum score: 2

• A patient with 1 or 2 risk factors has a worse prognosis than a patient with none.