Relation of changes over time in ventricular size and function to those inexercise capacity in patients with chronic heart failure

Background we studied the direction and magnitude of changes in left ventri cular (LV) cavity size and mass over time and whether these changes were re lated to those in exercise performance in patients with chronic heart failu re (CHF). Methods and Results The study group war compared of 59 patients (55 men age d 58 +/- 10 years) with CHF and IV end-diastolic diameter (EDD) >55 mm. All underwent echocardiography and a treadmill cardiopulmonary exercise test w ithin a 4-week interval (baseline) and again after a period of greater than or equal to 4 months (median of 14 months). At baseline, the group as a wh ole had moderate to severe LV dysfunction with an EDD of 70 +/- 9 mm, end-s ystolic diameter (ESD) of 60 +/- 11 mm, and LV mass of 500 +/- 200 EI. The mean peak oxygen consumption ((V) over dot o(2), 18 +/- 6 mL/kg per minute) was unrelated to LV cavity size or mass. EDD increased in 37 (63%) of the patients and fell in 22 (37%) patients from the initial to the second test. The absolute magnitude of changes over time averaged 7 mm for EDD, 125 g f or mass, and 6 mL/kg per minute for peak (V) over dot o(2). Changes in LV s ize and mass per year were significantly related to those in peak (V) over dot o(2) (r = -0.49 for EDD, r = -0.56 for ESD, and r = -0.44 for IV mass, respectively, all P <.001) and ventilatory response to exercise (r = 0.60, r = 0.58, and r = 0.72 for EDD, ESD, and LV mass; respectively, all P <.001 ). Conclusions Changes over lime in objective measures of LV dimensions and ma ss, in patient:, With CHF are significantly related to those in exercise ca pacity and respiratory efficiency.