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
5.6 L/min
5.2 L/min
4.8 L/min
6 L/min