Shock and Fluid Resuscitation Flashcards

A 34-year-old male arrives after a motorcycle crash with a deformed left femur, a heart rate of 130 beats/min, blood pressure of 88/52 mmHg, and cool, clammy skin. After initiating two large-bore IVs, which fluid is most appropriate for initial resuscitation of this patient in suspected hemorrhagic shock?

Answer: Lactated Ringer's solution

Lactated Ringer's is an isotonic crystalloid solution that is the preferred initial fluid for resuscitation in hemorrhagic shock according to TNCC guidelines. It most closely resembles the body's plasma composition and helps to buffer the metabolic acidosis often seen in shock states. While 0.9% NaCl is also an isotonic crystalloid, large volumes can lead to hyperchloremic metabolic acidosis. D5W is hypotonic and not suitable for volume resuscitation. Colloids like Hetastarch are generally not recommended for initial resuscitation due to potential adverse effects on coagulation and renal function.

A trauma patient with a penetrating chest wound is receiving a massive transfusion. The nurse should be most concerned about the 'lethal triad' of trauma, which consists of which of the following combinations?

Answer: Hypothermia, Acidosis, and Coagulopathy

The 'lethal triad' of trauma-induced coagulopathy, hypothermia, and acidosis is a critical concept in trauma resuscitation. Uncontrolled hemorrhage leads to coagulopathy, aggressive fluid resuscitation with cold fluids contributes to hypothermia, and poor tissue perfusion results in metabolic acidosis. These three factors create a vicious cycle that significantly increases mortality.

A 28-year-old female involved in a high-speed motor vehicle collision has a blood pressure of 85/60 mmHg despite receiving 1 liter of Lactated Ringer's. She has no signs of external bleeding and a negative FAST exam. Her heart rate is 125, respiratory rate is 28, and neck veins are distended. What type of shock is most likely?

Answer: Obstructive

This patient's presentation of hypotension with distended neck veins is classic for obstructive shock, likely due to cardiac tamponade or tension pneumothorax. In obstructive shock, there is a physical obstruction to blood flow into or out of the heart. Distended neck veins indicate increased central venous pressure, which is inconsistent with hypovolemic shock where veins would be flat.

The concept of 'permissive hypotension' is a strategy used in the initial management of certain trauma patients. In which of the following patient populations is this approach generally contraindicated?

Answer: Patients with a severe traumatic brain injury (TBI)

Permissive hypotension, or hypotensive resuscitation, aims to maintain a blood pressure just high enough for vital organ perfusion without dislodging newly formed clots at the site of injury. However, this strategy is contraindicated in patients with traumatic brain injury (TBI) because maintaining adequate cerebral perfusion pressure (CPP) is critical to prevent secondary brain injury. A lower systemic blood pressure would compromise CPP.

During the resuscitation of a patient with hemorrhagic shock, a balanced approach using a 1:1:1 ratio of blood products is often initiated. This ratio refers to the administration of:

Answer: 1 unit of packed red blood cells, 1 unit of fresh frozen plasma, and 1 unit of platelets.

Balanced resuscitation, often guided by a massive transfusion protocol (MTP), advocates for a 1:1:1 ratio of packed red blood cells (PRBCs), fresh frozen plasma (FFP), and platelets. This approach aims to mimic whole blood to more effectively treat the coagulopathy associated with massive hemorrhage by replacing not just oxygen-carrying capacity (RBCs) but also clotting factors (FFP) and platelets.

A trauma nurse is assessing the effectiveness of fluid resuscitation for a patient in hypovolemic shock. Which of the following is the most reliable indicator of improved tissue perfusion?

Answer: A decrease in the serum lactate level

While blood pressure, heart rate, and urine output are important parameters, a decreasing serum lactate level is a more direct and reliable indicator of improved end-organ tissue perfusion. Lactate is a byproduct of anaerobic metabolism, which occurs when tissues are not adequately oxygenated. A falling lactate level signifies a shift back to aerobic metabolism and the resolution of shock at the cellular level.