NEW DELHI : Eight COVID-19 patients, including the HOD of gastroenterology department, of Batra Hospital here died due to oxygen shortage, officials said on Saturday.We are trying to revive five other critical patients, said Dr S C L Gupta.Hospitals across the national capital had sent out SOS messages last week about depleting supplies of oxygen.The Delhi government has maintained that the city is not getting its allocated quantity of the life-saving gas.Deputy Chief Minister Manish Sisodia on Friday said oxygen crisis still persists in the national capital and they grapple with an SOS situation every day.Hospitals across the national capital and its suburbs have been grappling with oxygen shortage.