TCRN Special Patient Populations Questions and Answers — Questions and Answers
Question 1: An 84-year-old male on metoprolol for hypertension presents after a ground-level fall. His blood pressure is 110/68 mmHg, heart rate is 72 bpm, and he has new-onset confusion. Why is his heart rate a potentially unreliable indicator of early hemorrhagic shock?
- Age-related calcification of the sinoatrial node prevents a tachycardic response.
- The beta-blocker medication masks the compensatory tachycardia expected with hypovolemia. (Correct answer)
- The patient's confusion suggests a primary neurologic injury, which would cause bradycardia.
- Geriatric patients have a decreased circulatory volume, making blood pressure the only reliable sign.
Correct answer: The beta-blocker medication masks the compensatory tachycardia expected with hypovolemia.
Beta-blockers antagonize beta-adrenergic receptors, which blunts the normal compensatory tachycardic response to blood loss. In geriatric trauma patients on these medications, a heart rate within the normal range can provide false reassurance and mask significant underlying hemorrhage.
Question 2: A 7-year-old child is brought to the trauma center after being struck by a car. Assessment reveals a fractured right femur, right-sided pulmonary contusions, and a left-sided epidural hematoma. This classic pattern of injuries in a pediatric pedestrian is known as:
- Cushing's Triad
- Beck's Triad
- Pediatric Impact Triad
- Waddell's Triad (Correct answer)
Correct answer: Waddell's Triad
Waddell's Triad describes a common injury pattern in pediatric pedestrians struck by vehicles. It consists of: 1) ipsilateral (same side) femur/tibial fracture from the initial bumper impact, 2) ipsilateral thoracic or abdominal injuries from the fender/hood, and 3) a contralateral (opposite side) head injury as the child is thrown to the ground.
Question 3: Which intervention is the highest priority for a hemodynamically stable pregnant patient at 32 weeks gestation who sustained blunt abdominal trauma and is immobilized on a backboard?
- Placing a wedge under the right hip to achieve left uterine displacement. (Correct answer)
- Administering a 1-liter bolus of Lactated Ringer's solution.
- Obtaining an immediate portable abdominal x-ray to assess for fetal skeletal injury.
- Applying a fetal heart rate monitor to establish a baseline.
Correct answer: Placing a wedge under the right hip to achieve left uterine displacement.
After 20 weeks gestation, the gravid uterus can compress the inferior vena cava and aorta when the patient is supine, leading to supine hypotensive syndrome. This reduces venous return, decreases maternal cardiac output, and compromises uteroplacental perfusion. Tilting the patient or displacing the uterus to the left is a critical, immediate intervention to ensure adequate circulation for both mother and fetus.
Question 4: An 89-year-old resident of a skilled nursing facility presents with a new onset of confusion and lethargy. Staff report a minor, unwitnessed fall three weeks prior where the patient did not hit their head. This delayed, subacute neurological decline should raise the highest suspicion for which type of injury?
- Epidural hematoma
- Diffuse axonal injury
- Chronic subdural hematoma (Correct answer)
- Intraparenchymal hemorrhage
Correct answer: Chronic subdural hematoma
Due to age-related cerebral atrophy, the bridging veins that cross the subdural space are stretched and more susceptible to tearing from even minor trauma. This can cause a slow, insidious bleed, leading to a chronic subdural hematoma that presents with subtle and delayed neurological changes, such as confusion or somnolence, days to weeks after the initial injury.
Question 5: A morbidly obese trauma patient (BMI 48) requires endotracheal intubation. Which of the following is a primary challenge associated with airway management in this patient population?
- Increased likelihood of a posterior laryngeal anatomy.
- Rapid oxygen desaturation during periods of apnea. (Correct answer)
- Resistance to standard doses of induction agents.
- Inherent instability of the cervical spine due to excess weight.
Correct answer: Rapid oxygen desaturation during periods of apnea.
Bariatric patients have a significantly reduced functional residual capacity (FRC) and increased oxygen consumption. This combination means their oxygen reserves are depleted very quickly during apneic periods, such as during intubation, leading to rapid and profound desaturation.
Question 6: A 26-year-old female who is 28 weeks pregnant presents after a fall. Her vital signs are stable. Which of the following fetal heart rate patterns is the earliest and most sensitive indicator of fetal distress?
- A consistent rate of 140 bpm.
- Occasional early decelerations.
- Sustained fetal bradycardia. (Correct answer)
- A baseline variability of 10 bpm.
Correct answer: Sustained fetal bradycardia.
The normal fetal heart rate is typically between 110-160 bpm. Sustained fetal bradycardia (a rate below 110 bpm) is an ominous sign of fetal distress and may indicate significant maternal compromise (even before maternal vital signs change), placental abruption, or uterine rupture. It requires immediate investigation and intervention.
TCRN Special Patient Populations Questions and Answers
An 84-year-old male on metoprolol for hypertension presents after a ground-level fall.
His blood pressure is 110/68 mmHg, heart rate is 72 bpm, and he has new-onset confusion.
Why is his heart rate a potentially unreliable indicator of early hemorrhagic shock?