Using Magnetic Field Tracking to Confirm Nasogastric Tube Placement at Point of Care

Inclusion Criteria: \- Patients from the general ward or the Otorhinolaryngology clinic of Tan Tock Seng Hospital who had an NGT inserted within the last 10 days and chest X-ray confirming its correct placement * The NGT inserted is a Ryles tube size Fr 14 or 16 * COVID negative or not deemed to be infective as judged by the prevailing policies at the time of recruitment * Age \> or = 21 years * BMI \< 35 * Height \< 1.9m * Mentally competent for informed consent Exclusion Criteria: * • Radiological: * On chest X-ray, the length of the NGT distal to the gastroesophageal junction is less than 12cm, or the side-holes of the NGT can be visualized in the esophagus. * The NGT is kinked within 10cm of its tip * The chest X-ray is rotated such that the thorax is not oriented in the frontal plane * The NGT cannot be visualized in the mediastinum * The second intercostal space cannot be visualized on chest X-ray • Medically unstable: * Heart rate \>=100 or \<60 * Systolic blood pressure \>=160 or \<100 * SpO2 \<92% in patients with chronic lung disease and \<95% in patients without chronic lung disease * Temperature \>= 38 degrees Celsius • Chest wall deformity: * Patients with pectus carinatum or excavatum, defined by physical examination • Patients with the following implants * Pacemaker * Automatic cardioverter defibrillator * Ferromagnetic coronary stents or heart valves * Ferromagnetic implants of the cranium, face, spine, sternum o…