40 year old man presents with resting heart rate of 180 beats/min. Pressure-volume diagram of left ventricle is shown below. What is the cardiac output?

EDV = 130ml ; ESV = 50ml Stroke volume = EDV -ESV = 130 - 50 = 70 ml Cardiac output = Heart rate × Stroke Volume                          = 80 × 70                          = 5600 ml /min