You are attending rounds in cardiology department. Your professor asks you to calculate the volume of blood pumped with each beat of Mr X. He gives you the following values. BP of 130/80, cardiac output of 5000 ml and HR of 70/min.
You are attending rounds in cardiology department. Your professor asks you to calculate the volume of blood pumped with each beat of Mr X. He gives you the following values. BP of 130/80, cardiac output of 5000 ml and HR of 70/min.
💡 Explanation
**Core Concept**
The cardiac output (CO) is the volume of blood pumped by the heart per minute, and stroke volume (SV) is the volume of blood pumped by the heart with each beat. The relationship between CO, heart rate (HR), and stroke volume is given by the formula: CO = SV x HR.
**Why the Correct Answer is Right**
To calculate the stroke volume, we can rearrange the formula to SV = CO / HR. Given the cardiac output is 5000 ml/min and the heart rate is 70 beats/min, we can plug in these values to calculate the stroke volume. This will help us determine the volume of blood pumped with each beat of Mr X.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the calculation of stroke volume. The mean arterial pressure (MAP) is not required to calculate SV.
**Option B:** This option is incorrect because the cardiac output (CO) is given, and we need to use the heart rate (HR) to calculate the stroke volume (SV).
**Option C:** This option is incorrect because the diastolic blood pressure (DBP) is not relevant to the calculation of stroke volume (SV).
**Clinical Pearl / High-Yield Fact**
Remember the formula CO = SV x HR to calculate the stroke volume when given cardiac output and heart rate values. This is a crucial concept in understanding cardiac function and hemodynamics.