ISSN:
1573-2614
Keywords:
Heart: cardiac output
;
Equipment: gas analyzers
;
Oxygen: uptake
;
Measurement techniques: gas exchange
Source:
Springer Online Journal Archives 1860-2000
Topics:
Computer Science
,
Medicine
Notes:
Abstract Rapidly responding gas.analyzers have simplified the monitoring of oxygen uptake $$\left( {\dot V_{O_2 } } \right)$$ in the clinical exercise laboratory. An incremental, exhaustive, upright exercise test can be safely used to determine the, plateau in oxygen uptake during exercise, ormaximal $$\dot V_{O_2 } \left( {\dot V_{O_2 } \max } \right)$$ , in patients with chronic cardiac or circulatory failure. We define $$\dot V_{O_2 } \max $$ in these patients as an increase in $$\dot V_{O_2 } $$ of less than 1 ml/min/kg despite an increment in work load. The value for $$\dot V_{O_2 } \max $$ indicates the patient's aerobic capacity; it also predicts the maximal cardiac output during exercise and therefore serves as an estimate of cardiac reserve and of the severity of cardiac or circulatory failure. Symptom-limited $$\dot V_{O_2 } $$ during exercise, termedmaximum oxygen uptake but more appropriatelypeak $$\dot V_{O_2 } $$ , bears no relationship to $$\dot V_{O_2 } \max $$ . The two terms should not be used interchangeably.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00770881
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