Cardiac Reserve By 6-Minute Walk Stress Echocardiography In Systemic Sclerosis

Objectives There is a high prevalence of left ventricular diastolic dysfunction (LVDD) in systemic sclerosis (SSc) which is associated with high mortality. Thus, early detection of LVDD could be important in management of SSc. We hypothesised that exercise echocardiography in SSc patients with normal resting haemodynamics may expose early phase LVDD, which could affect its prognosis, defined as cardiovascular death and unplanned hospitalisation for heart failure.Methods Between January 2014 and December 2018, we prospectively enrolled 140 patients with SSc who underwent 6-minute walk (6MW) stress echocardiographic studies with normal range of estimated mean pulmonary arterial pressure (mPAP) (<25 mm Hg) and mean pulmonary artery wedge pressure (mPAWP) (<15 mm Hg) at rest. We used Delta mPAP/Delta cardiac output (CO) to assess pulmonary vascular reserve and Delta mPAWP/Delta CO to assess LV cardiac reserve between resting and post-6MW.Results During a median period of 3.6 years (IQR 2.0-5.1 years), 25 patients (18%) reached the composite outcome. Both Delta mPAP/Delta CO and Delta mPAWP/Delta CO in patients with events were significantly greater than in those without events (8.9 +/- 3.8 mm Hg/L/min vs 3.0 +/- 1.7 mm Hg/L/min; p=0.002, and 2.2 +/- 0.9 mm Hg/L/min vs 0.9 +/- 0.5 mm Hg/L/min; p<0.001, respectively). Patients with both impaired LV cardiac reserve (Delta mPAWP/Delta CO>1.4 mm Hg/L/min) and impaired pulmonary vascular reserve (Delta mPAP/Delta CO>3.0 mm Hg/L/min) had worse outcomes compared with those without these abnormalities (p<0.001).Conclusion The 6MW stress echocardiography revealed impaired LV cardiac reserve in SSc patients with normal resting haemodynamics. Furthermore, LV cardiac reserve independently associates with clinical worsening in SSc, providing incremental prognostic utility, in addition to pulmonary vascular parameters.