- What is the most appropriate next action?
Answer: Remove the catheter and needle completely and apply pressure to the site.
If a flashback is not obtained, the catheter is not properly seated in the vein. Probing or 'fishing' for the vein increases the risk of vessel damage, hematoma, and infiltration. Flushing a misplaced catheter will cause infiltration. Starting the fluid without confirmation of placement is unsafe. The correct procedure is to accept the attempt as unsuccessful, remove the device, apply pressure, and choose a new site.
- Which property of Lactated Ringer's solution makes it potentially unsuitable for administration with a blood transfusion?
Answer: It contains calcium, which may bind to the citrate anticoagulant in blood products and cause clotting.
Lactated Ringer's solution contains calcium. Blood products are preserved with citrate, which acts as an anticoagulant by binding to calcium. If LR is administered through the same line as blood, the calcium in the LR can overcome the citrate, potentially causing the blood to clot in the IV tubing. For this reason, 0.9% Normal Saline is the only crystalloid recommended for co-administration with blood products.
- What is the total volume of the fluid bolus you should prepare to administer?
Answer: 240 mL
The calculation is based on the child's weight and the ordered dose per kilogram. Weight (12 kg) × Dose (20 mL/kg) = 240 mL. The AEMT must be able to accurately calculate weight-based fluid boluses for pediatric patients.
- What is the role of IV fluid therapy in the immediate management of this patient?
Answer: Aggressive fluid resuscitation with an isotonic crystalloid should be initiated immediately.
In anaphylactic shock, massive vasodilation and capillary leakage cause a profound drop in blood pressure and relative hypovolemia. Along with epinephrine, aggressive IV fluid resuscitation with an isotonic crystalloid (like 0.9% NS or LR) is critical to fill the expanded vascular space and support blood pressure. Withholding fluids or using a maintenance rate is inadequate.
- Which IV fluid is the most appropriate choice for this patient?
Answer: 0.9% Normal Saline to correct hypotension without causing cerebral edema.
In a patient with a head injury, it is critical to avoid hypotonic solutions (like 0.45% NS and D5W), as they can increase free water in the circulation, which can cross the blood-brain barrier and worsen cerebral edema. Lactated Ringer's is slightly hypotonic and generally avoided. 0.9% Normal Saline is isotonic and is the preferred crystalloid for resuscitating a hypotensive patient with a suspected head injury, as it helps maintain cerebral perfusion pressure without increasing ICP.
- You are preparing to administer medication through a newly established IO line in an adult's proximal tibia. After confirming placement and flushing with saline, what is the next critical step before administering medications?
Answer: Administer a slow push of 2% lidocaine per protocol for pain management.
IO infusion can be extremely painful in a conscious patient. After confirming placement, standard protocol often involves administering 2% preservative-free lidocaine into the IO space prior to the main infusion to anesthetize the bone marrow cavity and reduce patient discomfort. A pressure bag is used for the infusion itself, not the flush. A large bolus is not the next step, and the needle should not be manipulated after insertion.
- Given the patient's age and presentation, which of the following represents the most appropriate initial approach to IV fluid therapy?
Answer: Establish an 18-gauge IV and administer a 500 mL bolus of 0.9% Normal Saline, then reassess vital signs.
The patient is hypotensive and tachycardic, indicating significant hypovolemia. An initial bolus is warranted. However, in geriatric patients, aggressive fluid resuscitation must be balanced with the risk of fluid overload and congestive heart failure. A 500 mL bolus is a prudent starting point, followed by reassessment. 0.9% Normal Saline is an appropriate isotonic crystalloid for this situation.
- What is the most likely complication and the AEMT's primary action?
Answer: Infiltration; discontinue the infusion and remove the IV catheter.
The signs of swelling, coolness, and tightness with a stopped flow are classic indicators of infiltration, where the IV fluid is leaking into the surrounding tissue. The primary action is to stop the infusion, remove the catheter, and apply pressure to the site. Phlebitis involves warmth and redness. Catheter shear is a rare and serious complication but presents differently. A venous spasm would likely cause pain along the vein.
- When considering fluid administration during resuscitation for this patient, which fluid is most appropriate to use and why?
Answer: 0.9% Normal Saline, because it does not contain potassium, which is likely already elevated.
Patients with ESRD are unable to excrete potassium, leading to chronic hyperkalemia, which is often the cause of their cardiac arrest. Lactated Ringer's contains potassium and would be contraindicated. 0.9% Normal Saline does not contain potassium and is the safest isotonic crystalloid for volume expansion in this patient population. D5W is hypotonic and not a resuscitation fluid. 0.45% saline is also hypotonic and inappropriate for resuscitation.
- Which IV access and fluid resuscitation plan is most appropriate for this patient?
Answer: Two large-bore (16- or 18-gauge) IVs in the antecubital fossae with Lactated Ringer's administered wide open.
This patient is in hemorrhagic shock. The standard of care is to establish two large-bore IVs for rapid volume replacement. The antecubital fossae are preferred sites for large catheters. Lactated Ringer's is an appropriate isotonic crystalloid for trauma resuscitation.
- What is the primary therapeutic goal of this initial fluid resuscitation?
Answer: To achieve permissive hypotension with a systolic BP of 80-90 mmHg.
In trauma with suspected uncontrolled internal hemorrhage, the goal is 'permissive hypotension' or 'hypotensive resuscitation.' The aim is to administer just enough fluid to maintain vital organ perfusion (indicated by a palpable radial pulse or a systolic BP of 80-90 mmHg) without raising the pressure so high that it disrupts clot formation and worsens bleeding. Restoring a normal BP is contraindicated as it can 'pop the clot.'
- These findings are most consistent with which IV complication?
Answer: Phlebitis
The classic signs of phlebitis (inflammation of the vein) are pain, erythema (redness), edema, and warmth along the vein's path. Sometimes a palpable venous cord is also present. Infiltration presents with coolness and swelling at the site. An air embolism and systemic infection would present with systemic signs and symptoms, not localized findings along the vein.
- What is the primary physiological purpose of this fluid challenge in the management of septic shock?
Answer: To increase intravascular volume and improve cardiac preload, thereby increasing blood pressure.
In septic shock, widespread vasodilation and capillary leakage lead to relative hypovolemia. A fluid challenge (bolus) is given to rapidly increase the volume of fluid within the blood vessels. This increases venous return to the heart (preload), which, according to the Frank-Starling mechanism, increases stroke volume and cardiac output, ultimately improving blood pressure and tissue perfusion.
- What is the correct drip rate in drops per minute (gtt/min)?
Answer: 83 gtt/min
The calculation is: (Total Volume in mL × Drip Factor in gtt/mL) / Time in minutes. (1000 mL × 10 gtt/mL) / 120 minutes = 10000 / 120 = 83.33 gtt/min. The closest answer is 83 gtt/min. The other answers represent common calculation errors, such as dividing by 60 minutes instead of 120 or using the wrong volume.
- What is the most appropriate next step for obtaining vascular access?
Answer: Establish intraosseous (IO) access in the proximal tibia.
In cardiac arrest, when peripheral IV access is difficult or delayed, intraosseous (IO) access is the recommended next step. It provides rapid, reliable access to the vascular system for medication and fluid administration. External jugular access is a difficult skill, and ET administration is no longer the preferred route due to unreliable absorption. Further peripheral attempts waste critical time.
- Which of the following is an absolute contraindication for placing an IO needle in a specific limb?
Answer: A fracture in the same bone proximal to the intended insertion site.
Placing an IO distal to a fracture in the same bone is an absolute contraindication because the infused fluid will leak from the fracture site into the soft tissues, leading to extravasation and potential compartment syndrome, and will not enter central circulation. Pain can be managed with lidocaine. A contralateral IV does not preclude IO placement. A healed surgical site is a relative, not absolute, contraindication.
- Regarding IV therapy for this patient, which approach is most appropriate?
Answer: Establish a saline lock for medication access but withhold fluid administration.
This patient is in cardiogenic shock secondary to CHF and is fluid overloaded, as evidenced by lung crackles, JVD, and edema. Administering a fluid bolus would worsen the pulmonary edema and respiratory distress. The most appropriate action is to establish IV access for potential medication administration (e.g., diuretics, vasodilators) but to withhold fluids. A saline lock achieves this without delivering unnecessary volume.
