 54y/o RHF went to bed at 10 PM at her boyfriend's home on 1/16/96. She was found lethargic by her son the next morning. Three other individuals in the house were lethargic and complained of HA that same morning. Her last memory was talking to her granddaughter at 5:00PM on 1/16/96. She next remembered riding in the ambulance from a Hospital. Initial Carboxyhemoglobin level was 24% (normal < 1.5%) and ABG 7.41/30/370 with O2Sat 75% on 100%FiO2.