Zeid, D., W. . Ahmed, R. Soliman, A. . . Alazab, and A. S. Elsawy. “Ultrasound-Guided Preload Indices During Different Weaning Protocols of Mechanically Ventilated Patients and Its Impact on Weaning Induced Cardiac Dysfunction”. Open Access Macedonian Journal of Medical Sciences, vol. 9, no. B, Nov. 2021, pp. 1370-8, doi:10.3889/oamjms.2021.7026.