You are in a physiology lab where you are able to simulate heart function and obtain values for heart rate, circulatory pressures & heart chamber volumes. At baseline, you record systolic and diastolic arterial pressures of 120/75 at a heart rate of 80. The CVP is 5 mmHg, the EDV is 140 mls and the ESV is 70 mls. After a hemodynamic perturbation of unknown origin, you record the same 6 values again and find that nothing changed except the CVP which is now 8 mmHg and the EDV which is now 160 mls. Assuming no other counteracting reflexes, what is the new cardiac output (CO), the new systemic vascular resistance (SVR) and the mechanism of the change?
- A) 5.6 L/min; 1214 dyne-sec-cm-5; ↑ contractility.
- B) 5.6 L/min; 15.18 dyne-sec-cm-5; ↑ preload.
- C) 7.2 L/min; 11.39 dyne-sec-cm-5; ↑ afterload.
- D) 7.2 L/min; 911 dyne-sec-cm-5; ↑ contractility.
- E) 7.2 L/min; 911 dyne-sec-cm-5; ↑ preload.