Echocardiography to guide fluid therapy in critically ill patients: check the heart and take a quick look at the lungs

blood vessel diameter; cardiopulmonary hemodynamics; cava vein; critically ill patient; Doppler echocardiography; echocardiography; Editorial; fluid therapy; heart function; heart output; heart preload; human; intensive care unit; lung function; patient monitoring; transesophageal echocardiography