Her Royal Highness Princess Bajrakitiyabha Narendiradebyavati remained unconscious and royal doctors blamed her illness on a bacterial infection.
In its third statement on the condition of the princess on Saturday night, the Royal Household Bureau said that royal doctors concluded her unconscious state resulted from severe heart arrhythmia due to inflammation of the heart after a mycoplasma infection.
The bureau said that the princess remained unconscious and royal doctors continued to administer medicine, including antibiotics, and use equipment to support the function of her lungs and kidneys while monitoring her condition closely.
Earlier the bureau said the princess passed out while she was training her pet dogs in Pak Chong district of Nakhon Ratchasima at 6.20pm on Dec 14, 2022.
The princess was taken to Pakchongnana Hospital in the district to receive initial treatment under the advice of royal doctors, the bureau said. She was transported by helicopter to King Chulalongkorn Memorial Hospital after her condition was stabilised.
The princess's pets were being trained as they competed in the Thailand Working Dog Championship 2022 organised by the Royal Thai Army at the Military Dog Battalion in the district from Dec 10-19, 2022.