When resuscitating a patient in shock which of the following is not an adequate parameter to predict end point of resuscitation?
**Core Concept**
Resuscitation in shock aims to restore adequate tissue perfusion and oxygenation. The endpoint of resuscitation is typically defined by achieving normal or near-normal vital signs and organ function. Parameters used to predict the endpoint of resuscitation include urine output, blood pressure, central venous oxygen saturation (ScvO2), and lactate levels.
**Why the Correct Answer is Right**
The endpoint of resuscitation is often assessed by monitoring parameters that reflect the adequacy of tissue perfusion and oxygenation. **Central venous pressure (CVP)** is a parameter that reflects the pressure within the superior and inferior vena cava, but it does not directly reflect the adequacy of tissue perfusion or oxygenation. CVP can be influenced by various factors such as fluid status, cardiac function, and intrathoracic pressure, making it a less reliable parameter to predict the endpoint of resuscitation.
**Why Each Wrong Option is Incorrect**
**Option A:** Urine output is a reliable parameter to predict the endpoint of resuscitation, as it reflects the adequacy of renal perfusion and function.
**Option B:** Lactate levels are a useful parameter to assess the adequacy of tissue perfusion and oxygenation, as elevated lactate levels can indicate anaerobic metabolism.
**Option C:** Central venous oxygen saturation (ScvO2) is a parameter that reflects the balance between oxygen delivery and consumption, making it a useful tool to predict the endpoint of resuscitation.
**Clinical Pearl / High-Yield Fact**
CVP is not a reliable parameter to predict the endpoint of resuscitation, as it can be influenced by various factors such as fluid status and cardiac function. A more reliable approach is to use a combination of parameters that reflect tissue perfusion and oxygenation, such as urine output, lactate levels, and ScvO2.
**Correct Answer:** C. Central venous pressure.