This 22-year-old apprentice was evaluated because of complaints of dyspnoea. He stated that he had been unable to play a full game of rugby for the last 3 years and that he gets out of breath and has to stop after climbing three to four flights of stairs at work. He never smoked. He denied cough, chest pain, oedema, or other symptoms. Physical, X-rays, and laboratory examinations were normal.
The patient performed exercise on a cycle ergometer. He pedalled at 60rpm without added load for 3minutes. The work rate was then increased 20W per minute to his symptom-limited maximum. He stopped exercise because of general fatigue. Resting and exercise ECGs were normal.
Selected Respiratory Function Data – were all within normal limits
|Hb, g/L||[130-165 g/L]||154|
|DLCO, ml/mm HG/Min||22.4||29.8|
Selected Exercise Data
|RER at end||1.22|
|VO2peak (max) (mL/kg/min)||42.5||46.3 (109%)|
|VO2 at AT||28.4 (67%)|
|VE/VCO at AT||25|
|Maximum VE, L.min||209.0||108.4 (52%)|
|BP (rest, max)||110/70; 180/60|
|ECG (rest, max)||82; 194 (98%)|
|Vd/Vt||0.28 – 0.09|
|O2 pulse||14 – 18|
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