TNCC Pre Test Exam Preparation Newest With Complete Questions And Correct
Detailed Answers| Brand New Version!
Question 1
In a patient undergoing resuscitation following major trauma, which of the following provides
the most accurate measure of the adequacy of cellular perfusion and serves as a predictor of
patient outcomes?
A) Heart rate and pulse oximetry
B) Mean arterial pressure and hourly urine output
C) Base deficit used in conjunction with serum lactate
D) Central venous pressure and skin temperature
E) Glasgow Coma Scale and respiratory rate
Correct Answer: C) Base deficit used in conjunction with serum lactate
Rationale: Base deficit and serum lactate are critical biomarkers used to assess global tissue
perfusion. Lactate levels rise during anaerobic metabolism (hypoperfusion), while base
deficit indicates the severity of metabolic acidosis. Unlike vital signs, which may be masked
by compensatory mechanisms, these values provide a direct look at cellular oxygenation
and help the trauma team predict the success of resuscitation efforts and overall mortality.
Question 2
During the management of a traumatic brain injury (TBI), the nurse understands that hypocapnia
(low CO2) affects the cerebral vasculature in which of the following ways?
A) Generalized vasodilation
B) Cerebral vasoconstriction
C) Increased intracranial pressure
D) Increased cerebral blood flow
E) Pulmonary hypertension
Correct Answer: B) Cerebral vasoconstriction
Rationale: Carbon dioxide (CO2) is a potent vasoactive substance in the brain. Hypocapnia
(typically achieved through hyperventilation) causes cerebral vasoconstriction, which
decreases cerebral blood volume and can temporarily lower intracranial pressure (ICP).
However, it must be used cautiously because excessive vasoconstriction can lead to cerebral
ischemia by severely restricting blood flow to injured brain tissue.
Question 3
A trauma patient is experiencing significant tissue hypoperfusion and an oxygen deficit at the
cellular level. Which metabolic state should the nurse anticipate?
A) Respiratory alkalosis
B) Metabolic alkalosis
C) Respiratory acidosis
D) Metabolic acidosis
E) Hypochloremic alkalosis
, 2
Correct Answer: D) Metabolic acidosis
Rationale: When cells do not receive enough oxygen (hypoperfusion), they shift from
aerobic to anaerobic metabolism. The byproduct of this shift is lactic acid. As lactic acid
accumulates in the bloodstream, it consumes bicarbonate buffers, resulting in metabolic
acidosis. This state is a hallmark of the "Trauma Triad of Death" and indicates that the
patient's cells are in a state of shock.
Question 4
Which type of shock is characterized specifically by generalized vasodilation due to the loss of
sympathetic nervous system tone?
A) Hypovolemic shock
B) Cardiogenic shock
C) Obstructive shock
D) Neurogenic shock
E) Septic shock
Correct Answer: D) Neurogenic shock
Rationale: Neurogenic shock is a form of distributive shock occurring after a high spinal
cord injury. The injury disrupts the descending sympathetic pathways, leading to loss of
vascular tone (vasodilation) and bradycardia. This results in "warm shock," where the
patient is hypotensive but the skin remains warm and dry, unlike the cool, clammy skin
seen in hypovolemic shock.
Question 5
A patient presents with a spinal cord injury involving levels C3 through C5. The nurse should be
most concerned about the loss of function in which nerve and its subsequent effect?
A) Vagus nerve; resulting in tachycardia
B) Sciatic nerve; resulting in lower extremity paralysis
C) Phrenic nerve; resulting in a paralyzed diaphragm and respiratory failure
D) Glossopharyngeal nerve; resulting in loss of gag reflex
E) Intercostal nerve; resulting in rib fractures
Correct Answer: C) Phrenic nerve; resulting in a paralyzed diaphragm and respiratory
failure
Rationale: The mnemonic "C3, 4, 5 keep the diaphragm alive" is vital for trauma nurses.
The phrenic nerve, which controls the diaphragm, originates from these cervical levels.
Damage to this area often results in the immediate loss of spontaneous breathing,
necessitating permanent mechanical ventilation or emergent intubation in the trauma bay.
Question 6
When managing a patient with suspected compartment syndrome in a lower extremity, what is
the appropriate position for that extremity to optimize perfusion?
, 3
A) Elevated significantly above the level of the heart
B) Placed in a dependent position below the heart
C) Elevated at the level of the heart
D) Tightly wrapped with a compression bandage
E) Placed in a neutral position with heat applied
Correct Answer: C) Elevated at the level of the heart
Rationale: In compartment syndrome, the goal is to maintain arterial inflow while avoiding
further venous congestion. Elevating the limb above the heart can decrease arterial
pressure, worsening ischemia. Placing it in a dependent position increases venous pressure
and edema. Maintaining the limb AT the level of the heart is the best balance to preserve
perfusion without increasing the pressure within the muscle compartment.
Question 7
A patient has suffered a severe frostbite injury to the hands. The nurse understands that which of
the following is a primary risk during the freezing and rewarming process?
A) Hyperglycemia
B) Thrombus formation
C) Hypoventilation
D) Increased intracranial pressure
E) Metabolic alkalosis
Correct Answer: B) Thrombus formation
Rationale: Frostbite causes direct cellular damage and vascular injury. As the tissues freeze
and thaw, inflammatory mediators are released, leading to platelet aggregation and the
formation of microthrombi (clots) in the small vessels. This can lead to tissue necrosis and
gangrene. Management often includes medications to inhibit clotting and improve
microcirculation.
Question 8
Which combination of medications may be administered to a patient with frostbite to maintain
perfusion and reduce inflammation?
A) Heparin and Morphine
B) Tissue plasminogen activator (tPA) and NSAIDs
C) Epinephrine and Diphenhydramine
D) Atropine and Steroids
E) Insulin and Potassium
Correct Answer: B) Tissue plasminogen activator (tPA) and NSAIDs
Rationale: tPA (Tissue plasminogen activator) may be used in severe frostbite to dissolve
microthrombi and restore blood flow to the digits, potentially preventing amputation.
NSAIDs (Non-steroidal anti-inflammatory drugs) are used to inhibit prostaglandins and
, 4
thromboxanes, which contribute to the inflammatory cascade and vascular constriction
associated with cold injuries.
Question 9
While monitoring a trauma patient's vital signs, the nurse notes a steady rise in the diastolic
blood pressure. This clinical finding is an indicator of which physiologic change?
A) Decreasing cardiac output
B) Decreasing intracranial pressure
C) Increasing peripheral resistance
D) Improving stroke volume
E) Venous insufficiency
Correct Answer: C) Increasing peripheral resistance
Rationale: Diastolic blood pressure reflects the pressure in the arteries when the heart is at
rest. An increase in diastolic pressure is often a compensatory response to trauma, where
the body causes systemic vasoconstriction to maintain mean arterial pressure. This increase
in "afterload" or peripheral resistance is the body's attempt to shunt blood to vital organs.
Question 10
A bariatric trauma patient requires stabilization. Which position is most beneficial to improve the
patient’s airway patency and work of breathing?
A) Supine with the head flat
B) Left lateral recumbent
C) Trendelenburg
D) Reverse Trendelenburg
E) Prone
Correct Answer: D) Reverse Trendelenburg
Rationale: In bariatric patients, the weight of the chest wall and abdominal contents can
severely impede lung expansion when the patient is supine (Atelectasis). Placing the patient
in Reverse Trendelenburg (head up, feet down) uses gravity to pull the abdominal contents
away from the diaphragm, increasing functional residual capacity and making it easier for
the patient to breathe.
Question 11
In the physics of an explosion, which phase of a blast results from flying debris and projectiles
causing penetrating injuries?
A) Primary Phase
B) Secondary Phase
C) Tertiary Phase
D) Quaternary Phase
E) Quinary Phase
Detailed Answers| Brand New Version!
Question 1
In a patient undergoing resuscitation following major trauma, which of the following provides
the most accurate measure of the adequacy of cellular perfusion and serves as a predictor of
patient outcomes?
A) Heart rate and pulse oximetry
B) Mean arterial pressure and hourly urine output
C) Base deficit used in conjunction with serum lactate
D) Central venous pressure and skin temperature
E) Glasgow Coma Scale and respiratory rate
Correct Answer: C) Base deficit used in conjunction with serum lactate
Rationale: Base deficit and serum lactate are critical biomarkers used to assess global tissue
perfusion. Lactate levels rise during anaerobic metabolism (hypoperfusion), while base
deficit indicates the severity of metabolic acidosis. Unlike vital signs, which may be masked
by compensatory mechanisms, these values provide a direct look at cellular oxygenation
and help the trauma team predict the success of resuscitation efforts and overall mortality.
Question 2
During the management of a traumatic brain injury (TBI), the nurse understands that hypocapnia
(low CO2) affects the cerebral vasculature in which of the following ways?
A) Generalized vasodilation
B) Cerebral vasoconstriction
C) Increased intracranial pressure
D) Increased cerebral blood flow
E) Pulmonary hypertension
Correct Answer: B) Cerebral vasoconstriction
Rationale: Carbon dioxide (CO2) is a potent vasoactive substance in the brain. Hypocapnia
(typically achieved through hyperventilation) causes cerebral vasoconstriction, which
decreases cerebral blood volume and can temporarily lower intracranial pressure (ICP).
However, it must be used cautiously because excessive vasoconstriction can lead to cerebral
ischemia by severely restricting blood flow to injured brain tissue.
Question 3
A trauma patient is experiencing significant tissue hypoperfusion and an oxygen deficit at the
cellular level. Which metabolic state should the nurse anticipate?
A) Respiratory alkalosis
B) Metabolic alkalosis
C) Respiratory acidosis
D) Metabolic acidosis
E) Hypochloremic alkalosis
, 2
Correct Answer: D) Metabolic acidosis
Rationale: When cells do not receive enough oxygen (hypoperfusion), they shift from
aerobic to anaerobic metabolism. The byproduct of this shift is lactic acid. As lactic acid
accumulates in the bloodstream, it consumes bicarbonate buffers, resulting in metabolic
acidosis. This state is a hallmark of the "Trauma Triad of Death" and indicates that the
patient's cells are in a state of shock.
Question 4
Which type of shock is characterized specifically by generalized vasodilation due to the loss of
sympathetic nervous system tone?
A) Hypovolemic shock
B) Cardiogenic shock
C) Obstructive shock
D) Neurogenic shock
E) Septic shock
Correct Answer: D) Neurogenic shock
Rationale: Neurogenic shock is a form of distributive shock occurring after a high spinal
cord injury. The injury disrupts the descending sympathetic pathways, leading to loss of
vascular tone (vasodilation) and bradycardia. This results in "warm shock," where the
patient is hypotensive but the skin remains warm and dry, unlike the cool, clammy skin
seen in hypovolemic shock.
Question 5
A patient presents with a spinal cord injury involving levels C3 through C5. The nurse should be
most concerned about the loss of function in which nerve and its subsequent effect?
A) Vagus nerve; resulting in tachycardia
B) Sciatic nerve; resulting in lower extremity paralysis
C) Phrenic nerve; resulting in a paralyzed diaphragm and respiratory failure
D) Glossopharyngeal nerve; resulting in loss of gag reflex
E) Intercostal nerve; resulting in rib fractures
Correct Answer: C) Phrenic nerve; resulting in a paralyzed diaphragm and respiratory
failure
Rationale: The mnemonic "C3, 4, 5 keep the diaphragm alive" is vital for trauma nurses.
The phrenic nerve, which controls the diaphragm, originates from these cervical levels.
Damage to this area often results in the immediate loss of spontaneous breathing,
necessitating permanent mechanical ventilation or emergent intubation in the trauma bay.
Question 6
When managing a patient with suspected compartment syndrome in a lower extremity, what is
the appropriate position for that extremity to optimize perfusion?
, 3
A) Elevated significantly above the level of the heart
B) Placed in a dependent position below the heart
C) Elevated at the level of the heart
D) Tightly wrapped with a compression bandage
E) Placed in a neutral position with heat applied
Correct Answer: C) Elevated at the level of the heart
Rationale: In compartment syndrome, the goal is to maintain arterial inflow while avoiding
further venous congestion. Elevating the limb above the heart can decrease arterial
pressure, worsening ischemia. Placing it in a dependent position increases venous pressure
and edema. Maintaining the limb AT the level of the heart is the best balance to preserve
perfusion without increasing the pressure within the muscle compartment.
Question 7
A patient has suffered a severe frostbite injury to the hands. The nurse understands that which of
the following is a primary risk during the freezing and rewarming process?
A) Hyperglycemia
B) Thrombus formation
C) Hypoventilation
D) Increased intracranial pressure
E) Metabolic alkalosis
Correct Answer: B) Thrombus formation
Rationale: Frostbite causes direct cellular damage and vascular injury. As the tissues freeze
and thaw, inflammatory mediators are released, leading to platelet aggregation and the
formation of microthrombi (clots) in the small vessels. This can lead to tissue necrosis and
gangrene. Management often includes medications to inhibit clotting and improve
microcirculation.
Question 8
Which combination of medications may be administered to a patient with frostbite to maintain
perfusion and reduce inflammation?
A) Heparin and Morphine
B) Tissue plasminogen activator (tPA) and NSAIDs
C) Epinephrine and Diphenhydramine
D) Atropine and Steroids
E) Insulin and Potassium
Correct Answer: B) Tissue plasminogen activator (tPA) and NSAIDs
Rationale: tPA (Tissue plasminogen activator) may be used in severe frostbite to dissolve
microthrombi and restore blood flow to the digits, potentially preventing amputation.
NSAIDs (Non-steroidal anti-inflammatory drugs) are used to inhibit prostaglandins and
, 4
thromboxanes, which contribute to the inflammatory cascade and vascular constriction
associated with cold injuries.
Question 9
While monitoring a trauma patient's vital signs, the nurse notes a steady rise in the diastolic
blood pressure. This clinical finding is an indicator of which physiologic change?
A) Decreasing cardiac output
B) Decreasing intracranial pressure
C) Increasing peripheral resistance
D) Improving stroke volume
E) Venous insufficiency
Correct Answer: C) Increasing peripheral resistance
Rationale: Diastolic blood pressure reflects the pressure in the arteries when the heart is at
rest. An increase in diastolic pressure is often a compensatory response to trauma, where
the body causes systemic vasoconstriction to maintain mean arterial pressure. This increase
in "afterload" or peripheral resistance is the body's attempt to shunt blood to vital organs.
Question 10
A bariatric trauma patient requires stabilization. Which position is most beneficial to improve the
patient’s airway patency and work of breathing?
A) Supine with the head flat
B) Left lateral recumbent
C) Trendelenburg
D) Reverse Trendelenburg
E) Prone
Correct Answer: D) Reverse Trendelenburg
Rationale: In bariatric patients, the weight of the chest wall and abdominal contents can
severely impede lung expansion when the patient is supine (Atelectasis). Placing the patient
in Reverse Trendelenburg (head up, feet down) uses gravity to pull the abdominal contents
away from the diaphragm, increasing functional residual capacity and making it easier for
the patient to breathe.
Question 11
In the physics of an explosion, which phase of a blast results from flying debris and projectiles
causing penetrating injuries?
A) Primary Phase
B) Secondary Phase
C) Tertiary Phase
D) Quaternary Phase
E) Quinary Phase
