Abgs And Ventilator Settings
Questions and Answers
- 1.
Analyze: pH 7.56, CO2 28, HCO3 25
- A.
Normal
- B.
Uncompensated respiratory alkalosis
- C.
Compensated metabolic acidosis
- D.
Metabolic alkalosis
Correct Answer
B. Uncompensated respiratory alkalosisExplanation
The pH is high, so it is alkalosis.
CO2 is low – that could be the cause (respiratory)
HCO3 is normal – so that’s not the cause, and it isn’t even trying to fix it!
(So it’s “respiratory” alkalosis).
This isn’t compensated because HCO3 wasn’t trying to “fix” it and the pH is abnormal.
So it's uncompensated respiratory alkalosisRate this question:
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- 2.
Analyze: pH 6.96, CO2 71, HCO3 22
- A.
Metabolic alkalosis
- B.
Normal
- C.
Uncompensated respiratory acidosis
- D.
Compensated acidosis
Correct Answer
C. Uncompensated respiratory acidosisExplanation
The pH is low, so it’s acidosis.
CO2 is high, so that is the cause (respiratory)
HCO3 is normal, so it's not trying to fix it.
So this is uncompensated respiratory acidosis.Rate this question:
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- 3.
Analyze: pH 7.16, CO2 52, HCO3 29
- A.
Metabolic acidosis
- B.
Partially compensated metabolic alkalosis
- C.
Respiratory alkalosis
- D.
Partially compensated respiratory acidosis
Correct Answer
D. Partially compensated respiratory acidosisExplanation
The pH is low, so it’s acidosis.
CO2 is high, so that is the cause (respiratory).
HCO3 is high, so that couldn’t be the cause, but it’s trying to fix it!
(So it’s compensated respiratory acidosis, but...only “partly” compensated since HCO3 is trying to fix it but the pH is still abnormal.Rate this question:
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- 4.
Analyze: pH 7.50, CO2 29, HCO3 17
- A.
Partially compensated respiratory alkalosis
- B.
Respiratory alkalosis
- C.
Metabolic alkalosis
- D.
Partially compensated metabolic alkalosis
Correct Answer
A. Partially compensated respiratory alkalosisExplanation
The pH is high, so it’s alkalosis.
CO2 is low, so that is the cause (respiratory).
HCO3 is low, so it couldn’t be the cause – but it’s trying to fix it!
(So it’s compensated respiratory alkalosis).
Only “partly” compensated since HCO3 is trying to fix it but the pH is still abnormal.Rate this question:
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- 5.
Analyze: pH 7.75, CO2 37, HCO3 40
- A.
Metabolic acidosis
- B.
Uncompensated metabolic alkalosis
- C.
Partially compensated respiratory acidosis
- D.
Uncompensated respiratory alkalosis
Correct Answer
B. Uncompensated metabolic alkalosisExplanation
The pH is high, so it’s alkalosis.
CO2 is normal, so that's not the cause.
HCO3 is high, so that's the cause (metabolic) - look back at CO2 now. It's not abnormal, so it's not even trying to fix it!
It’s not compensated because the pH is still abnormal, and CO2 is not trying to “fix” it!Rate this question:
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- 6.
Analyze: pH 7.33, CO2 66, HCO3 35
- A.
Uncompensated respiratory acidosis
- B.
Metabolic alkalosis
- C.
Metabolic acidosis
- D.
Partially compensated respiratory acidosis
Correct Answer
D. Partially compensated respiratory acidosisExplanation
The pH is low, so it’s acidosis.
CO2 is high, so that is the cause (respiratory)
HCO3 is high, so that couldn’t be the cause – but it’s trying to fix it!
Only “partly” compensated since HCO3 is trying to fix it but the pH is still abnormal.Rate this question:
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- 7.
Analyze: pH 6.68, CO2 85, HCO3 30
- A.
Partially compensated respiratory alkalosis
- B.
Uncompensated metabolic acidosis
- C.
Uncompensated respiratory acidosis
- D.
Partially compensated respiratory acidosis
Correct Answer
D. Partially compensated respiratory acidosisExplanation
The pH is low, so it’s acidosis.
CO2 is high, so that is the cause (respiratory)
HCO3 is high, so it's trying to fix it - but the pH is still abnormal.
It’s only partially compensated because the pH is still abnormal.Rate this question:
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- 8.
Analyze: pH 7.60, CO2 58, HCO3 16
- A.
Uncompensated respiratory acidosis
- B.
Partially compensated metabolic alkalosis
- C.
Uncompensated metabolic alkalosis
- D.
Partially compensated respiratory acidosis
Correct Answer
A. Uncompensated respiratory acidosisExplanation
pH: 7.60 (alkalosis) CO2: 58 (elevated, indicating respiratory acidosis) HCO3: 16 (low, indicating metabolic acidosis)
This scenario suggests an uncompensated respiratory acidosis. The pH is elevated (alkalosis), which is likely a compensatory response to the respiratory acidosis. However, the bicarbonate (HCO3) level is not sufficiently elevated to fully compensate for the respiratory acidosis, indicating uncompensated acidosis. Therefore, the correct analysis is: Uncompensated respiratory acidosisRate this question:
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- 9.
Which of the following ventilator modes delivers oxygen at a preset tidal volume or pressure in response to the patient’s inspiratory efforts and initiates a breath if the patient fails to do so within the preset time?
- A.
IMV
- B.
ASV
- C.
CMV
- D.
CPAP
Correct Answer
C. CMVExplanation
CMV stands for Continuous Mandatory Ventilation. In this mode, the ventilator delivers oxygen at a preset tidal volume or pressure. It also initiates a breath if the patient fails to do so within the preset time. This mode is commonly used for patients who are unable to breathe on their own or require full ventilatory support.Rate this question:
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- 10.
Which of the following ventilator modes delivers oxygen at a preset tidal volume or pressure and rate while allowing the patient to breathe spontaneously? Ventilator breaths are synchronized to the patient’s respiratory effort.
- A.
IMV
- B.
ASV
- C.
CMV
- D.
CPAP
Correct Answer
A. IMVExplanation
IMV stands for Intermittent Mandatory Ventilation. In this mode, the ventilator delivers a preset tidal volume or pressure and rate to the patient, but also allows the patient to breathe spontaneously. The ventilator breaths are synchronized to the patient's respiratory effort, meaning that the machine detects when the patient is initiating a breath and delivers support accordingly. This mode is commonly used when the patient has some respiratory drive but still requires assistance from the ventilator.Rate this question:
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- 11.
Which of the following ventilator modes applies positive pressure during the patient’s spontaneous breaths? The patient controls the rate, inspiratory flow, and tidal volume.
- A.
IMV
- B.
ASV
- C.
CMV
- D.
CPAP
Correct Answer
D. CPAPExplanation
CPAP stands for Continuous Positive Airway Pressure. It is a ventilator mode that applies positive pressure during the patient's spontaneous breaths. In CPAP mode, the patient controls the rate, inspiratory flow, and tidal volume. This mode is commonly used to treat sleep apnea and provide support for patients with respiratory distress. It helps to keep the airways open and maintain a constant pressure during both inhalation and exhalation, improving oxygenation and reducing the work of breathing.Rate this question:
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- 12.
Which of the following ventilator modes automatically adjusts its settings to maintain 100mL/min/kg of minute ventilation?
- A.
IMV
- B.
ASV
- C.
CMV
- D.
CPAP
Correct Answer
B. ASVExplanation
ASV stands for Adaptive Support Ventilation. It is a ventilator mode that automatically adjusts its settings to maintain a specific minute ventilation of 100mL/min/kg. This means that ASV will continuously monitor the patient's respiratory parameters and adjust the ventilator settings, such as tidal volume and respiratory rate, to ensure that the desired minute ventilation is achieved. This mode is particularly useful in providing personalized and optimal ventilation support to patients with varying respiratory needs.Rate this question:
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- 13.
What is the typical setting for PEEP?
- A.
5-10 cm H20
- B.
3-5 cm H20
- C.
10-12 mL/kg
- D.
40-80 L/min
Correct Answer
B. 3-5 cm H20Explanation
PEEP stands for positive end-expiratory pressure and is a setting used in mechanical ventilation to help maintain lung volume and improve oxygenation. The typical setting for PEEP is 3-5 cm H20. This means that at the end of each breath, a small amount of pressure is maintained in the lungs to prevent alveolar collapse and improve gas exchange. This setting is commonly used in patients with acute respiratory distress syndrome (ARDS) or other conditions that cause lung injury.Rate this question:
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- 14.
What is the typical setting for Tidal Volume?
- A.
5-10 cm H20
- B.
3-5 cm H20
- C.
10-12 mL/kg
- D.
40-80 L/min
Correct Answer
C. 10-12 mL/kgExplanation
Tidal Volume refers to the amount of air that is inhaled and exhaled with each breath during normal breathing. The typical setting for Tidal Volume is 10-12 mL/kg, which means that for every kilogram of body weight, 10-12 milliliters of air should be delivered. This setting ensures adequate ventilation and oxygenation for the patient based on their weight.Rate this question:
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- 15.
What is the typical setting for pressure support?
- A.
5-10 cm H20
- B.
3-5 cm H20
- C.
10-12 mL/kg
- D.
40-80 L/min
Correct Answer
A. 5-10 cm H20Explanation
The typical setting for pressure support is 5-10 cm H20. This refers to the amount of pressure provided during the inspiratory phase of a breath to assist the patient in breathing. This range is commonly used to support patients with respiratory conditions who may have difficulty generating enough pressure on their own to breathe effectively. It helps to reduce the work of breathing and improve ventilation.Rate this question:
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- 16.
What is the typical setting for inspiratory flow rate?
- A.
5-10 cm H20
- B.
3-5 cm H20
- C.
10-12 mL/kg
- D.
40-80 L/min
Correct Answer
D. 40-80 L/minExplanation
The typical setting for inspiratory flow rate is 40-80 L/min. This range allows for an adequate amount of air to be delivered to the patient during inspiration, ensuring proper oxygenation and ventilation. Higher flow rates may be necessary for patients with increased respiratory demands, while lower flow rates may be used for patients with compromised lung function. It is important to adjust the inspiratory flow rate based on the individual patient's needs to optimize respiratory support.Rate this question:
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- 17.
Which of the following indicate that the patient will not tolerate weaning? Select all that apply.
- A.
Respiratory rate 45 breaths/min
- B.
Diastolic blood pressure 80
- C.
Diaphoresis
- D.
Decreased level of consciousness
- E.
Spontaneous tidal volume 500mL
- F.
Using accessory muscles to breathe
Correct Answer(s)
A. Respiratory rate 45 breaths/min
C. Diaphoresis
D. Decreased level of consciousness
F. Using accessory muscles to breatheExplanation
The patient will not tolerate weaning if they have a respiratory rate of 45 breaths/min, diaphoresis (excessive sweating), a decreased level of consciousness, and if they are using accessory muscles to breathe. These signs indicate that the patient is experiencing respiratory distress and may not be able to adequately maintain their own breathing without support.Rate this question:
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- 18.
Which of the following ventilator alarms can be caused by a kinked/clogged tubing?
- A.
Low respiratory rate
- B.
Low inspiratory pressure
- C.
Low exhaled tidal volume
- D.
High pressure limit
Correct Answer
D. High pressure limitExplanation
A kinked or clogged tubing can restrict the flow of air, causing increased pressure within the ventilator circuit. This increased pressure can trigger the high pressure limit alarm, alerting the healthcare provider that there is a potential issue with the tubing.Rate this question:
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- 19.
Which of the following ventilator alarms can happen when the patient stops spontaneously breathing on their own?
- A.
HIgh respiratory rate
- B.
High inspiratory pressure
- C.
Low exhaled tidal volume
- D.
High pressure limit
Correct Answer
C. Low exhaled tidal volumeExplanation
When a patient stops spontaneously breathing on their own, it means that they are not taking in enough air. This can result in a low exhaled tidal volume, which is the amount of air exhaled with each breath. Therefore, a low exhaled tidal volume alarm can occur in this situation.Rate this question:
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- 20.
Which of the following ventilator alarms can result from pain/fear/anxiety?
- A.
High respiratory rate
- B.
Low inspiratory pressure
- C.
Low exhaled tidal volume
- D.
Low pressure limit
Correct Answer
A. High respiratory rateExplanation
Pain, fear, and anxiety can cause an increase in the respiratory rate, leading to a high respiratory rate alarm on a ventilator. When a person is in pain or experiencing fear or anxiety, their body's natural response is to increase their breathing rate in order to get more oxygen. This can be detected by the ventilator, triggering the high respiratory rate alarm.Rate this question:
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- 21.
Which of the following ventilator alarms can happen when a patient disconnects their ET tube from the ventilator tubing?
- A.
High respiratory rate
- B.
Low inspiratory pressure
- C.
High exhaled tidal volume
- D.
High pressure limit
Correct Answer
B. Low inspiratory pressureExplanation
When a patient disconnects their ET tube from the ventilator tubing, it can result in a loss of pressure in the inspiratory phase. This loss of pressure leads to a decrease in the inspiratory pressure, causing the alarm for low inspiratory pressure to sound. This alarm is triggered because the ventilator is unable to deliver the required pressure to support the patient's breathing.Rate this question:
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- 22.
The main methods for weaning a patient from the ventilator include all of the following except:
- A.
PSV
- B.
SIMV
- C.
T-piece trials
- D.
CMV
Correct Answer
D. CMVExplanation
The question is asking for the method that is not used for weaning a patient from the ventilator. PSV (Pressure Support Ventilation), SIMV (Synchronized Intermittent Mandatory Ventilation), and T-piece trials are all commonly used methods for weaning patients from the ventilator. CMV (Controlled Mechanical Ventilation), on the other hand, is not typically used for weaning but rather for providing full ventilatory support to the patient. Therefore, the correct answer is CMV.Rate this question:
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- 23.
Which of the following is a major concern with SIMV/IMV?
- A.
Can result in hyperventilation
- B.
Requires sedation or paralysis or both
- C.
May increase the work of breathing
- D.
Can decrease cardiac output
Correct Answer
C. May increase the work of breathingExplanation
SIMV/IMV (Synchronized Intermittent Mandatory Ventilation/Intermittent Mandatory Ventilation) is a ventilation mode that allows the patient to breathe spontaneously while also receiving support from the ventilator. One major concern with SIMV/IMV is that it may increase the work of breathing. This is because the patient needs to initiate their own breaths, which can be challenging and require more effort. This increased work of breathing can lead to fatigue and respiratory muscle exhaustion. Therefore, careful monitoring and adjustment of ventilator settings are necessary to ensure optimal support and prevent the potential negative effects on the patient's respiratory effort.Rate this question:
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- 24.
Your ventilated patient is coughing, red-faced and seems to be in distress. Which of the following interventions would be most helpful?
- A.
Reassure the patient that he is ok
- B.
Administer Ativan 2mg IV
- C.
Suction the patient
- D.
Lower the head of the bed
Correct Answer
C. Suction the patientExplanation
The most likely reason for this is that the patient needs to be suctioned. Try that first - if that doesn't help, then look for other causes. You need to identify the cause before you just give the Ativan. Reassuring him that he is ok may work - but ONLY after you have identified that there isn't an actual physical cause you can fix. Lowering the head of the bed would be bad!Rate this question:
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- 25.
The IV sedation required for ventilated patients can have which of the following hemodynamic effects?
- A.
Increased blood pressure
- B.
Increased respiratory rate
- C.
Increased heart rate
- D.
Decreased blood pressure
Correct Answer
D. Decreased blood pressureExplanation
The BP almost ALWAYS drops with sedation - be ready for it!Rate this question:
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Current Version
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Mar 28, 2024Quiz Edited by
ProProfs Editorial Team -
Nov 19, 2015Quiz Created by
Mamatomaddy
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