Table 1

Clinical Variables (N = 78)

Age, yrs58 ± 12
Male7 (9)
Body surface area, m21.5 ± 0.1
Diagnosis
 Systemic sclerosis54 (70)
 Systemic lupus erythematosus16 (20)
 Mixed connective tissue disease8 (10)
%FEV1, %88 ± 17
%FVC, %101 ± 13
Baseline hemodynamics
 Heart rate, beats/min73 ± 12
 Systolic blood pressure, mm Hg126 ± 20
 Diastolic blood pressure, mm Hg73 ± 12
 SpO2, %98 ± 1
Post 6-min walk hemodynamics
 Heart rate, beats/min98 ± 21
 Systolic blood pressure, mm Hg133 ± 24
 Diastolic blood pressure, mm Hg75 ± 14
 SpO2, %96 ± 3
 6-min walk distance, m479 ± 99

Values are mean ± SD or n (%).

%FEV1 = percent forced expiratory volume in 1 s; %FVC = percent forced vital capacity; SpO2 = percutaneous oxygen saturation.