Noninvasive measurement of cardiac performance in recovery from exercise in heart failure patients

• Autor(a) principal: Myers, Jonathan N
• Data de Publicação: 2011
• Outros Autores: Gujja, Pradeep, Neelagaru, Suresh, Hsu, Leon, Burkhoff, Daniel
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Clinics
• Texto Completo: https://www.revistas.usp.br/clinics/article/view/19599
• topic: Heart failure; cardiac output; oxygen uptake; exercise testing; heart-rate recovery

OBJECTIVE: To examine the association between cardiac performance during recovery and the severity of heart failure, as determined by clinical and cardiopulmonary exercise test responses. METHODS: As part of a retrospective cohort study, 46 heart failure patients and 13 normal subjects underwent cardiopulmonary exercise testing while cardiac output was measured using a noninvasive device. Cardiac output in recovery was expressed as the slope of a single exponential relationship between cardiac output and time; the recovery-time constant was assessed in relation to indices of cardiac function, along with clinical, functional, and cardiopulmonary exercise responses. RESULTS: The recovery time constant was delayed in patients with heart failure compared with normal subjects (296.7 + 238 vs. 110.1 +27 seconds, p