Anesthetic Equipment and Monitoring Practice Questions

Q: The pin index of the following cylinder is:

2,5. ***2,5*** - The image displays a **blue gas cylinder**, which commonly indicates that it contains **nitrous oxide**. - According to the **Pin-Index Safety System**, the pin-index for nitrous oxide cylinders is **2 and 5**. *1,5* - The combination of **1 and 5** is typically associated with **medical air** cylinders. - This cylinder is blue, indicating nitrous oxide, not medical air. *3,5* - The pin index of **3 and 5** is designated for **nitrogen gas**. - The color of the cylinder (blue) does not correspond to nitrogen. *1,6* - The pin index of **1 and 6** is typically designated for **carbon dioxide** cylinders. - The cylinder's color and the intended gas (nitrous oxide) do not match this pin index.

Q: The pin index of the following cylinder is:

2,5. ***2,5*** - The image displays a gas cylinder with a **pin index safety system** where pins are evident at positions 2 and 5. This specific pin configuration is standard for **nitrous oxide** cylinders. - The pin index system for medical gases is designed to prevent incorrect gas connections, ensuring that only the proper regulator can be attached to a specific gas cylinder. *1,5* - A pin index of 1,5 is associated with **oxygen** cylinders. The cylinder in the image has a different pin configuration, which indicates it does not contain oxygen. - The physical appearance and color coding (blue body with a white shoulder/top, though not clearly visible in this image other than the body color) of this cylinder are not consistent with oxygen. *3,5* - A pin index of 3,5 is designated for **air** cylinders. The pin configuration in the image does not match this setting. - Each medical gas has a unique and standardized pin index combination to ensure safety and prevent medical errors. *7* - A single pin at position 7 is associated with **carbon dioxide** cylinders. The cylinder in the image clearly shows two pins, not one. - The pin index system relies on precise hole and pin placement to achieve gas-specific connections.

Q: The following capnographic tracing shows:

Multiple rebreathing. ***Multiple rebreathing*** - The **multiple oscillations** in the expiratory plateau (phase 3) indicate that the patient is repeatedly rebreathing exhaled gases, which are incompletely flushed from the breathing system. - This pattern is often due to **inadequate fresh gas flow** in a semi-open or non-rebreathing circuit, or a malfunctioning expiratory valve allowing exhaled CO2 to return into the inspiratory limb.

Q: The following capnographic tracing represents:

Hyperventilation. ***Hyperventilation*** - The capnographic tracing shows a **progressive decrease in end-tidal CO2 (EtCO2)** values (from 37 to 28 mmHg). This steady decline indicates that the patient is blowing off more CO2 than is being produced, which is characteristic of hyperventilation. - **Hyperventilation** increases the rate of CO2 elimination from the lungs, leading to a reduction in the partial pressure of CO2 in the expired air. *Hypoventilation* - **Hypoventilation** would be characterized by a gradual **increase in EtCO2** values as the patient retains more carbon dioxide. - The tracing shows the opposite trend, with decreasing EtCO2 numbers. *Dislodged ET* - A **dislodged endotracheal tube (ETT)** would typically result in a **sudden and dramatic drop in EtCO2** to near zero, or an absence of a clear capnographic waveform, indicating that the sensor is no longer in the airway or is sampling ambient air. - The tracing shows a clear waveform with decreasing but still significant EtCO2 values. *Kinked ET* - A **kinked ET tube** would lead to an **increase in airway resistance**, potentially affecting ventilation and gas exchange. - This typically manifests as a **sloping or shark-fin appearance** to the capnograph waveform, indicating an expiratory flow obstruction, and might lead to an *increase* in EtCO2 if effective ventilation is compromised, not a decrease.

Q: The following capnographic tracing represents:

Malfunction of carbon dioxide rebreather system. ***Malfunction of carbon dioxide rebreather system*** - The capnograph shows a **progressive increase in baseline CO2** and an increasing end-tidal CO2 (ETCO2) from 40 to 47 mmHg, indicating a buildup of CO2 due to inadequate CO2 removal. - This pattern is characteristic of a malfunctioning rebreather system, such as **exhausted soda lime** in an anesthetic circuit, where exhaled CO2 is not effectively absorbed. *Endobronchial intubation* - Endobronchial intubation typically results in **unilateral breath sounds** and can cause a decrease in ETCO2 due to reduced effective alveolar ventilation. - It does not typically lead to a progressively increasing baseline CO2 or ETCO2 in the manner shown, as CO2 exchange is still occurring, just less efficiently. *Pregnancy* - Pregnancy is associated with a **physiologic decrease in ETCO2** due to increased tidal volume and respiratory rate, leading to chronic hyperventilation to facilitate CO2 transfer to the fetus. - It would not cause a rising baseline CO2 or an increasing ETCO2 as depicted in the tracing. *Esophageal intubation* - Esophageal intubation is characterized by the **absence of a sustained capnograph waveform**, as no significant CO2 is exhaled from the esophagus. - A transient, small amount of CO2 may be detected initially from gastric CO2, but it quickly drops to zero, which is distinctly different from the waveform shown.

Q: The following capnographic tracing represents:

Hypoventilation. ***Hypoventilation*** - The capnographic tracing shows a **gradual increase in end-tidal CO2 (ETCO2)** from 37 mmHg to 42 mmHg and then to 46 mmHg over successive breaths. - An increase in ETCO2 indicates that less carbon dioxide is being exhaled, which is characteristic of **hypoventilation** (inadequate alveolar ventilation). *Hyperventilation* - Hyperventilation would lead to an **excessive removal of CO2**, resulting in a decrease in ETCO2, which is the opposite of what is shown in the tracing. - The tracing shows increasing ETCO2 values, inconsistent with active **CO2 washout**. *Pulmonary embolism* - A pulmonary embolism typically causes an **increase in dead space ventilation**, leading to a *decrease* in ETCO2, often with a normal PaCO2 (increased alveolar-arterial CO2 gradient). - The capnogram might show a *widened alpha angle* or a *steeper ascent* but primarily a decrease in the overall ETCO2 value, not a progressive increase as seen here. *Right to left shunting* - Right-to-left shunting means that deoxygenated blood bypasses the lungs and enters the systemic circulation, causing **hypoxemia** but does not directly affect the ETCO2 value in the same manner as ventilation changes. - While it can lead to respiratory compensation with increased minute ventilation, the direct effect on the capnogram is not a steady increase in ETCO2 in the absence of hypoventilation.

Q: The following capnographic tracing is seen in:

Curare cleft. ***Curare cleft*** - The capnography tracing shows an abrupt **dip or 'cleft'** in the plateau phase, which is characteristic of a 'curare cleft' or 'window' on the capnogram. This occurs when the effect of **muscle relaxants (like curare)** starts to wear off, and the patient attempts to breathe spontaneously against a ventilator. - The spontaneous inspiratory effort causes a temporary decrease in **CO2 delivery to the airway**, leading to the characteristic dip in the capnogram. *Endobronchial intubation* - Endobronchial intubation typically results in a **reduced tidal volume** to the non-occluded lung and increased dead space ventilation in the occluded lung, but it does not cause this specific "cleft" morphology. - The capnogram might show a **gradual decrease in end-tidal CO2 (ETCO2)** due to ventilation-perfusion mismatch, but not an abrupt dip. *Pregnancy* - Pregnancy leads to various physiological changes, including an **increase in minute ventilation** and a **decrease in arterial PCO2 (PaCO2)**. - The capnogram in a pregnant patient would likely show a **lower baseline ETCO2** due to hyperventilation but would not exhibit a 'curare cleft'. *Esophageal intubation* - Esophageal intubation is characterized by the **absence of CO2** or very low, inconsistent CO2 readings on the capnogram, as the esophagus does not contain significant CO2. - The trace would appear as a **flat line or show minimal, erratic CO2 fluctuations**, clearly distinct from the described curvilinear pattern with a dip.

Q: The interpretation for the following capnography is:

Curare cleft. ***Curare cleft*** - The image displays a **sudden-onset notch** in the alveolar plateau phase of the capnogram, which is characteristic of a "curare cleft." - This pattern indicates that the patient has initiated a **spontaneous breathing effort** against a mechanical ventilator shortly after being given a muscle relaxant (like curare), or that the muscle relaxant is **wearing off**. *Endobronchial intubation* - Endobronchial intubation typically leads to a **reduction in EtCO2** (end-tidal carbon dioxide) values and may show a **sloping or prolonged alveolar plateau** due to reduced functional lung volume. - This pattern does not typically feature a sudden, sharp notch during the plateau like the "curare cleft." *Bronchospasm* - Bronchospasm usually results in a **sharply rising ascending phase** and a **gradual, prolonged up-sloping alveolar plateau** (shark fin appearance) on the capnogram, along with some increase in EtCO2. - The presented image does not show this characteristic "shark fin" appearance but rather a distinct clef. *Esophageal intubation* - Esophageal intubation is characterized by a **flatline capnogram**, indicating **no CO2 exhalation**, or only small, transient CO2 readings that rapidly trend to zero as stomach CO2 is exhaled. - The provided capnogram clearly shows significant, sustained CO2 readings, ruling out esophageal intubation.

Q: The following capnography recording indicates:

Curare cleft. ***Curare cleft*** - The image displays a prominent "curare cleft" or "wagon wheel" pattern, which is a dip in the plateau phase of the capnograph waveform. - This cleft indicates the spontaneous **respiratory efforts** of a patient who is not adequately paralyzed or whose muscle relaxant is wearing off. *Pulmonary embolism* - A pulmonary embolism typically causes a sudden decrease in **end-tidal CO2 (EtCO2)** due to increased dead space, leading to a lower plateau, but not a "cleft" pattern. - The waveform would show a flat plateau at a lower CO2 value with an increased alpha angle. *Bronchospasm* - Bronchospasm results in an **obstructive pattern** on the capnogram, characterized by a **prolonged expiratory phase** and a "shark fin" appearance, where the ascending limb is steep, and the alveolar plateau is sloped. - It does not present as a dip in the plateau phase. *Esophageal intubation* - Esophageal intubation would result in a **flatline capnograph** or very small, sporadic waveforms, because no CO2 is being exhaled from the lungs. - The waveform in the image clearly shows significant CO2 exhalation, ruling out esophageal intubation.

Question 1

The pin index of the following cylinder is:

Accepted Answer

2,5

Answer

1,5

Answer

3,5

Answer

1,6

Question 2

The pin index of the following cylinder is:

Accepted Answer

2,5

Answer

1,5

Answer

3,5

Answer

7

Question 3

A young intern is managing a patient of Acute MI who developed cardiac arrest when thrombolysis was initiated. The patient was intubated, CPR was performed and one ampoule of adrenaline was given. The capnographic tracing indicates:

Accepted Answer

Satisfactory chest compression with return of spontaneous circulation

Answer

Nonsatisfactory chest compression with brain death

Answer

Nonsatisfactory chest compression worsened with cardiogenic shock

Answer

Satisfactory chest compression and kinked endotracheal tube

Question 4

The following capnographic tracing shows:

Accepted Answer

Multiple rebreathing

Answer

Cardiogenic oscillations

Answer

Bronchospasm

Answer

Normal capnography

Question 5

The following capnographic tracing represents:

Accepted Answer

Hyperventilation

Answer

Hypoventilation

Answer

Dislodged ET

Answer

Kinked ET

Question 6

The following capnographic tracing represents:

Accepted Answer

Malfunction of carbon dioxide rebreather system

Answer

Endobronchial intubation

Answer

Pregnancy

Answer

Esophageal intubation

Question 7

The following capnographic tracing represents:

Accepted Answer

Hypoventilation

Answer

Hyperventilation

Answer

Pulmonary embolism

Answer

Right to left shunting

Question 8

The following capnographic tracing is seen in:

Accepted Answer

Curare cleft

Answer

Endobronchial intubation

Answer

Pregnancy

Answer

Esophageal intubation

Question 9

The interpretation for the following capnography is:

Accepted Answer

Curare cleft

Answer

Endobronchial intubation

Answer

Bronchospasm

Answer

Esophageal intubation

Question 10

The following capnography recording indicates:

Accepted Answer

Curare cleft

Answer

Pulmonary embolism

Answer

Bronchospasm

Answer

Esophageal intubation

Anesthetic Equipment and Monitoring — MCQs

Anesthetic Equipment and Monitoring — MCQs

On this page

Practice by Chapter

Want unlimited practice?