intermediate ICU和one-stick是啥意思？谢谢

An 80-year-old, weight 90 kg and height 5′7’, male with a past medical history of  coronary artery disease, diabetes mellitus, right inguinal hernia, hypertension, chronic obstructive pulmonary disease, and end-stage renal disease requiring hemo-dialysis is admitted to an intermediate ICU with upper gastrointestinal bleeding. He is conscious, pale, cold, and clammy. Since he complains of being cold, he is covered with several blankets. His BP is 90/40 and his heart rate is 120 sinus rhythm. His Hct is 20, and he is transfused with three units of packed red blood cells over a 40-min period. Following this he becomes unresponsive with very weak respiratory efforts. A one-stick radial arterial blood gas shows a pH 6.9, pCO2 107, and paO2 of 53 on a 100% O2 non-rebreather mask.