[Determination of the ventilatory threshold during the exercise test in patients with cardiac insufficiency. Relation of the lactate threshold].
The non-invasive assessment of the lactate threshold during exercise test is possible in normal subjects by the study of respiratory gas exchange: a ventilatory threshold may be determined using Wasserman's criteria. This determination is more unreliable in cardiac failure. Forty-four patients with cardiac failure underwent exercise tests with measurement of lactate concentrations and respiratory gas exchanges during the exercise. Despite a regular increase in the lactate concentration from the onset of exercise, it was possible to determine a lactate threshold in the majority of patients. A ventilatory threshold could be determined in 27 to 38 patients depending on the method used. The correlation between these two thresholds was excellent (r = 0.87). The determination of the ventilatory threshold during exercise is therefore possible in cardiac failure. The main limitation of the method is that no result can be obtained in a large number of patients (15 to 20%) which restricts its value as a principal method of therapeutic evaluation.
Cohen-Solal
A
A
Service de cardiologie, hôpital Bichat, Paris.
Guichet
D
D
Benessiano
J
J
Aumont
M C
MC
D000368:Aged; D015308:Anaerobic Threshold; D002245:Carbon Dioxide / Q000032:analysis; D005080:Exercise Test; D006333:Heart Failure / Q000097:blood / Q000503:physiopathology*; D006801:Humans; D007773:Lactates / Q000097:blood*; D008875:Middle Aged; D010100:Oxygen / Q000032:analysis; D012119:Respiration
D007773:Lactates; D002245:Carbon Dioxide; D010100:Oxygen
Détermination du seuil ventilatoire au cours d'une épreuve d'effort chez l'insuffisant cardiaque. Relation avec le seuil du lactate.