Table 23.3 Open in new tab Results from...

Table 23.3

Results from cardiopulmonary exercise testing in patients with differential diagnoses

Variable	Chronic heart failure	Chronic obstructive airways disease	Obesity	Hyperventilation	Poor effort
pVo₂	↓	↓	↓	↓	↓
AT	↓	↔/↓	↓	↔	Often impossible to determine or normal
RER at peak	↔	↔	↔	↓ at peak	↓
Ve/Vco₂	↑	↑	↑/↔	↑/↔	↑/↔
Breathing reserve	↔/↑	↓	↑	↑	↓
Vital capacity	↓	↑	↓	↔	↑
P _et co ₂	↑	↑	↔	↓	↔
Comments	Reduced ΔVo₂/ΔWR, oscillatory breathing	Increased dead space, FEV₁ low	Physical examination confirms obesity	RER and ventilation ↑ prior to exercise, abrupt further increase in ventilation at onset of exercise

Variable	Chronic heart failure	Chronic obstructive airways disease	Obesity	Hyperventilation	Poor effort
pVo₂	↓	↓	↓	↓	↓
AT	↓	↔/↓	↓	↔	Often impossible to determine or normal
RER at peak	↔	↔	↔	↓ at peak	↓
Ve/Vco₂	↑	↑	↑/↔	↑/↔	↑/↔
Breathing reserve	↔/↑	↓	↑	↑	↓
Vital capacity	↓	↑	↓	↔	↑
P _et co ₂	↑	↑	↔	↓	↔
Comments	Reduced ΔVo₂/ΔWR, oscillatory breathing	Increased dead space, FEV₁ low	Physical examination confirms obesity	RER and ventilation ↑ prior to exercise, abrupt further increase in ventilation at onset of exercise

pVo₂; peak O₂ consumption, RER; respiratory exchange ratio, Ve/Vco₂; relationship between ventilation and CO₂ production, P_etco₂; end-tidal CO₂, ΔVo₂/ΔWR; ratio between change in O₂ consumption and change in work rate

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