Mattar, A., "nutrition in mechanically ventilated patients", critical care summit, Cairo ,Grand Hyatt hotel, 8 January 2015, Submitted.
Mattar, A., "Enteral nutrition in cancer patient", Nutrition & Cancer, Cairo ,Grand Hyatt hotel, 19 March 2015, Submitted.
Mattar, A., "weight loss resistance during obesity management (non responders)", EMASO conference for obesity management, Cairo intercontinental hotel , 26 February 2015, Submitted.
Mattar, A., and Reham.Gamal, comparison of the ultrasonic CVP insertion between internal jugular and axillary approaches, , Cairo, Cairo university, 2013.
Mattar, A., and H..Mostafa, "Use of transoesophageal Doppler in guiding weaning from mechanical ventilation in cardiac patients", conference of society of critical care medicine,phoenix, Arizona, USA, 17january2015.