Dr. Sushil Upadhyay is currently affiliated to Rama Medical College and Hospital, Pulmonary Medicine, India, continuing research in the specialized scientific area of Hepatopumonary syndrome (HPS); intrapulmonary vascular dilatation (IPVD); Liver transplantation (LT). Dr. Sushil Upadhyay is serving as an honorary reviewer for reputed journals and has authored several articles along with chapters in different books related to Unusual Cause of Hypoxemia