An 86-year-old patient underwent total hip replacement one day ago. She was conscious, well-oriented to time and space. She was breathing spontaneously without the necessity of oxygen therapy. Sinus rhythm. Hypotension (90/42 mmHg, mean arterial pressure 59 mmHg), without the need of administration of catecholamines. A stable level of haemoglobin, physiological capillary refill time, the normal value of lactate, oliguria around 0.5 ml/kg/h.
The patient would probably not tolerate typical passive leg raise testing (pain during manipulation, obesity, dyspnea in the supine position).