<prompt> Under normal circumstances, left ventricular shoening fraction LVSF is:20406075  <response>: Left ventricular shoening fraction LVSF is the percentage of shoening of LV fibers from their end-diastolic length EDL. EDL and ESL are end-diastolic length and end-systolic length, respectively. Normal LVSF 35-40. The value of LVSF decreases in LV failure. 