Effect of posture change and/or hand gripping on venous cannulation induced vasovagal response

Interventions will include posture change (supine position) and hand gripping (squeezing stress ball in the opposing arm to the venous cannulation). There will be three interventional groups: 1, Patient will assume supine position during PIVC (peripheral intravenous cannulation), patient will remain flat until either the patient requests to sit upright or is transferred to the CT scanner. 2, Patient will be in sitting position and squeeze a stress ball in opposing arm to the insertion of PIVC until the PIVC is secured. 3. Patient will assume supine position during the PIVC insertion, the patient will remain flat until either the patient requests to sit upright or is transferred to the CT scanner. Meanwhile Patient will be instructed to squeeze a stress ball in opposing arm to the insertion of PIVC until the PIVC is secured. The interventions will continue until successful insertion of the PIVC. The primary nurse will be administering the relevant intervention under direct supervision of the research staff. Training will be provided to ensure all nursing staff in the Imaging department perform their tasks uniformly. Research staff will be always available onsite to provide supervision and monitor adherence to the interventions.