Zeid, D., Ahmed, W. , Soliman, R., Alazab, A. and Elsawy, A.S. 2021. 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. 9, B (Nov. 2021), 1370–1380. DOI:https://doi.org/10.3889/oamjms.2021.7026.