What is the least preferred resuscitation fluid for casualties in shock?

The least preferred resuscitation fluid for casualties in shock is plasma or red blood cells (RBCs) alone. This approach is largely discouraged because using only plasma or RBCs without appropriate balance can lead to inadequate fluid resuscitation and compromised hemodynamic stability. In shock situations, the primary goal is to restore effective circulating blood volume as well as to ensure adequate oxygen delivery to tissues.

Resuscitation efforts should also focus on addressing the totality of the patient's needs, which often includes the provision of electrolytes and other supportive fluids. Plasma or RBCs alone may fail to provide the necessary volume expansion and may not adequately normalize blood pressure or improve perfusion, especially in cases of hemorrhagic shock. Other types of fluids, like colloids or crystalloids, might be more effective in these scenarios for achieving volume resuscitation and supporting recovery.

Utilizing tactics that involve a mixture of fluid types, such as crystalloids and blood components, tends to yield better results. Hence, a balanced approach to resuscitation fluid is crucial during these emergency situations, making the use of plasma or RBCs alone less favorable.