The Hemodynamic Effects of Spinal Block with Low Dose of Bupivacaine and Sufentanil in Patients with Low Myocardial Ejection Fraction - Sanatkar, Mehdi; Sadeghi, Mostafa; Esmaeili, Nafiseh; Sadrossadat, Hossein; Shoroughi, Mehrdad; Ghazizadeh, Shahrokh; Khoshraftar, Ebrahim; Pour Anvari, Hassan; Alipour, Nasim (Acta Medica Iranica)