Equipment/Monitoring Flashcards
A 34-year-old female is undergoing laparoscopic tubal ligation. Her vital signs are: BP - 110/74 mmHg, P - 70/min, R - 10/min. Her mean arterial pressure is approximately:
86 mmHg
Because the time spent in diastole is approximately twice the time spent in systole, a time-weighted average is used to calculate mean arterial pressure (MAP). The formula for MAP is:
MAP = (SBP) + 2(DBP)
3
pg. 87
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
According to the American Society for Testing and Materials F1850-00 standard, an anesthesia machine must have:
- a carbon dioxide absorber
- an exhaled volume or ventilatory carbon dioxide monitor
- unidirectional flow valves
- an active scavenging system
an exhaled volume or ventilatory carbon dioxide monitor
The ASTM F1850-00 standard requires monitoring of breathing system pressures, exhaled tidal volume, ventilatory carbon dioxide, anesthetic vapor concentration, inspired oxygen concentration, oxygen supply pressure, arterial saturation, arterial blood pressure and electrocardiogram. In addition, the anesthesia workstation must have a 3-tiered prioritized alarm system.
pg. 244
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
In the central venous pressure tracing below, ventricular contraction corresponds to:
B
The pressure increase seen at point B is the result of bulging of the tricuspid valve during ventricular contraction.
pp. 299-300
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
The risk of occupational exposure to inhaled anesthetic agents is higher with:
- an open scavenger
- a closed scavenger
- passive scavenging
- active scavenging
an open scavenger
Unless used correctly, the risk of occupational exposure is higher with an open interface. Open scavenging systems require an active disposal system for effective scavenging.
pg. 281
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
When calculating the cardiac output using the Fick principle:
- systemic vascular resistance must be determined
- mixed venous oxygen content must be determined
- stroke volume must be determined
- aortic root velocity must be determined
mixed venous oxygen content must be determined
The Fick principle states that the amount of oxygen consumed equals the difference between arterial and mixed venous oxygen content multiplied by the cardiac output. Therefore cardiac output is equal to:
Oxygen consumption A-V oxygen content difference
pg. 114
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
When using a circle system, readings from the oxygen analyzer may overestimate the actual inspired oxygen concentration if the sensor is placed in the:
- expiratory limb
- inspiratory limb
- Y-piece
- fresh gas line
fresh gas line
The concentration of oxygen inspired by the patient is determined by the mixture of fresh gas and expired gas. As a result of oxygen consumption, placement of the oxygen analyzer sensor in the fresh gas line may overestimate the actual inspired oxygen concentration - especially if low flows are used.
pg. 67
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
In adults, the distance from the ventricular port to the tip of a pulmonary artery catheter is:
- 10 cm
- 20 cm
- 30 cm
- 40 cm
20 cm
The ventricular port on a PA catheter is 20 cm from the tip; the distance of the proximal port is 30 cm.
pg. 106
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
Ventricular arrhythmias are not induced by electrosurgical units as a result of the:
- small amount of current applied
- frequency of the current applied
- low voltage of the current applied
- large dispersive pad used
frequency of the current applied
In contrast to the current from the line power (60 Hz), electrosurgical units (ESUs) use ultrahigh frequencies (0.1 - 3 MHz) to avoid the induction of arrhythmias. Also, ESUs use a large return pad for the dispersal of exiting electrical current to avoid burns at the exit site.
pg. 19
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
pp. 204-205
Barash, PG, Cullen, BF, Stoelting, RK, Cahalan, MK, Stock, MC, and Ortega, R. Clinical Anesthesia. Philadelphia: Lippincott Williams & Wilkins, 2013.
Inspired and expired gases that can be measured using infrared absorption analysis include: (Select 2)
- carbon dioxide
- desflurane
- oxygen
- nitrogen
carbon dioxide, desflurane
Most anesthetic gases and carbon dioxide are now measured by infrared absorption analysis. Nonpolar gases such as oxygen and nitrogen do not absorb infrared light and must be measured by other means.
pg. 233
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
A list of definitions is shown (Click here to display definitions). By dragging & reordering the selections in yellow, match the term with the associated definition.
- Sterilization
- Sanitation
- Disinfection
- Decontamination
1) Process capable of removing or destroying all viable forms of microbial life, including bacterial spores, to an acceptable assurance level.
2) Process of reducing the number of microbial contaminants to a relatively safe level.
3) Process capable of destroying most microorganisms but, as ordinarily used, not bacterial spores.
4) Process that renders inanimate items safe for handling by personnel who are not wearing protective attire.
Sterilization 1) Process capable of removing or destroying all viable forms of microbial life, including bacterial spores, to an acceptable assurance level.
Sanitization 2) Process of reducing the number of microbial contaminants to a relatively safe level.
Disinfection 3) Process capable of destroying most microorganisms but, as ordinarily used, not bacterial spores.
Decontamination 4) Process that renders inanimate items safe for handling by personnel who are not wearing protective attire.
Cleaning and Sterilization Terms
pp. 628-631
Dorsch, JA, Dorsch, SE. A Practical Approach to Anesthesia Equipment. Philadelphia, PA: Lippincott Williams & Wilkins, 2011.
The normal gradient between PaCO2 and ETCO2 is approximately:
- 2 to 5 mmHg
- 7 to 10 mmHg
- 10 to 13 mmHg
- 15 to 17 mmHg
2 - 5 mmHg
The normal gradient between PaCO2 and ETCO2 is 2 - 5 mmHg and reflects alveolar dead space. Any significant reduction in lung perfusion increases alveolar dead space, diluting expired CO2 and increasing the gradient.
pg. 127
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
During the delivery of an anesthetic in the CT scanning suite, oxygen from the E-cylinder is being used. The patient is intubated and spontaneously ventilating with 94% oxygen and 6% desflurane. Sixty minutes into the case the pressure of the E-cylinder has fallen from 2000 psi to 1100 psi. From this information, the fresh gas flow is estimated to be:
4.8 - 5.2 L/min
The content of oxygen in an E-cylinder is about 660 L when full, at a pressure of 2000 psi. As oxygen is expended, the cylinder’s pressure falls in proportion to the content. As a result, a fall in pressure from 2000 to 1100 results in:
content = (1100/2000) x 660 = 363 L remaining in cylinder
660 L - 363L = 297L consumed in during case
297 L / 60 minutes = 4.95 L/minute
pg. 249
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
In the flow-volume loops below, endotracheal tube kinking is best represented by:
C
Loop C demonstrates reduced flow during both inspiration and exhalation without changes in lung volume.
pg. 468
Dorsch, JA, Dorsch, SE. A Practical Approach to Anesthesia Equipment. Philadelphia, PA: Lippincott Williams & Wilkins, 2011.
The effect of methemoglobinemia on the pulse oximetry reading is to:
- cause a reading of 85% regardless of the actual saturation
- cause a reading that is 10% less then the actual saturation
- have only minimal effect on the saturation reading
- maintain a reading of 99% regardless of the actual saturation
cause a reading of 85% regardless of the actual saturation
Methemoglobin has the same absorption coefficient at both red and infrared wavelengths causing a reading of 85% regardless of the actual hemoglobin saturation.
pg. 125
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
For accurate blood pressure measurement, the width of the blood pressure cuff should be:
- 10 to 15% > than the diameter of the extremity
- 20 to 50% > than the diameter of the extremity
- equal to the circumference of the extremity
- 20 to 50% > than the circumference of the extremity
20 - 50% greater than the diameter of the extremity
The accuracy of any method of blood pressure measurement depends on proper cuff size. The cuff’s bladder should extend at least halfway around the extremity and the width of the cuff should be 20 - 50% greater than the diameter of the extremity.
pg. 91
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
Interchanging the position of the APL valve and the fresh gas inlet transforms a Mapleson A circuit into a:
- Mapleson B circuit
- Mapleson C circuit
- Mapleson D circuit
- Mapleson E circuit
Mapleson D circuit
Interchanging the position of the APL and fresh gas inlet on a Mapleson A circuit results in the creation of the Mapleson D circuit, which is better suited for controlled ventilation.
pp 33, 35-36
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
The capnogram below is indicative of:
exhausted carbon dioxide absorbent
Elevation of the baseline of the capnogram indicates rebreathing. This could be the result of an incompetent expiratory valve or an exhausted carbon dioxide absorber.
pg. 316
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
At or below which of the following pressures is it recommended that the E-cylinder of oxygen be changed?
- 250 psi
- 500 psi
- 750 psi
- 1000 psi
1000 psi
Current anesthesia apparatus checkout recommendations state that the E-cylinder of oxygen should be at least half full corresponding to a pressure of 1000 psi.
pg. 84
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
During the administration of general anesthesia for a laparoscopic herniorrhaphy using a circle system, the capnogram below was obtained. This capnogram is consistent with:
an incompetent inspiratory valve
An incompetent inspiratory valve causes part of the expired gas to flow back into the inspiratory limb and allows these exhaled gases to be inspired with the next breath. This results in a delay in the initiation of Phase IV of the capnogram.
pg. 433
Dorsch, JA, Dorsch, SE. A Practical Approach to Anesthesia Equipment. Philadelphia, PA: Lippincott Williams & Wilkins, 2011.
Concerning the use of lasers, as wavelength increases:
- tissue penetration increases
- the area of coagulation increases
- absorption by water increases
- the risk of retinal damage increases
absorption by water increases
As wavelength increases the energy of the laser light decreases. There is increased absorption by water and decreased tissue penetration and coagulation. Corneal damage is more likely with longer wavelength lasers (CO2 laser) and retinal damage is more likely with shorter wavelength lasers (YAG laser).
pg. 776
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
Advantages of nondiverting (flowthrough) capnographs include:
- light weight
- no traction placed on the ETT
- no aspiration of gas from the circuit
- direct delivery of aspirated gas to the scavenger
no aspiration of gas from the circuit
Nondiverting capnographs measure carbon dioxide passing through an adaptor placed in the breathing circuit. The weight of the sensor can cause traction on the tracheal tube. However, since the sensor is in the gas stream, no aspiration of gas is required.
pg. 126
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
In order for leakage current to be perceptible to touch, the current must exceed:
- 0.5 mA
- 1.0 mA
- 20 mA
- 100 mA
1.0 mA
Most current leaks are imperceptible. In order to be felt, leakage current must exceed 1.0 mA. Leakage current of 100 mA or greater is capable of causing ventricular fibrillation.
pg. 231
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
A 78-year-old female is scheduled to undergo a right knee replacement. Prior to induction, the rhythm strip below is obtained. At this time the most appropriate course of action is:
postpone the case and obtain a cardiology consultation
This rhythm strip shows a regular atrial rhythm and a regular ventricular rhythm, but no relationship between the P wave and the QRS complex. This rhythm constitutes a complete heart block, also known as a 3rd degree block. Immediate treatment is required if cardiac output is reduced and consideration should be given to insertion of a pacemaker.
pg. 1703
Barash, PG, Cullen, BF, Stoelting, RK, Cahalan, MK, Stock, MC, and Ortega, R. Clinical Anesthesia. Philadelphia: Lippincott Williams & Wilkins, 2013.
Small circuit leaks will have little effect on minute ventilation when using a:
- time-cycled ventilator
- pressure-cycled ventilator
- volume-cycled ventilator
- hanging-bellows ventilator
pressure-cycled ventilator
With pressure-cycled ventilators, small leaks will not cause a change in tidal volume, and secondarily minute ventilation, because cycling will be delayed until the pressure limit is met. Hanging-bellows ventilators are no longer approved for use in the anesthesia circuit.
pp. 273-274
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
Some patients are at increased risk for hand ischemia secondary to radial artery catheterization because of an incomplete palmar arch. The approximate percentage of patients with incomplete palmar arch is:
- 1%
- 5%
- 10%
- 15%
5%
About five percent of patients have incomplete palmar arches and lack adequate collateral blood flow.
pg. 92
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
As compared to non-rebreathing circuits, disadvantages of the circle system include:
- higher fresh gas flow rates are needed
- decreased humidity of inspired gases as compared to the Mapleson D circuit
- higher system resistance
- higher inspiratory carbon dioxide levels
higher system resistance
Disadvantages of the circle system include: greater size, decreased portability, increased complexity, increased risk of disconnection, increased system resistance and difficulty in predicting inspired gas concentrations during low fresh gas flows. With a properly functioning carbon dioxide absorber, inspired carbon dioxide levels should approach zero in the circle system.
pp. 265-268
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
The tracing below is noted during the insertion of a pulmonary artery catheter. As the catheter is advanced further:
the diastolic pressure will increase
This trace is demonstrating a right ventricular pressure trace. As the catheter is further advanced it will cross the pulmonic valve and the diastolic pressure will increase.
pp. 299-300
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
Determinants of bobbin position in the flowmeter include: (Select 2)
- gas density at low-flow rates
- gas viscosity at high-flow rates
- gas molecular weight at high-flow rates
- changes in atmospheric pressure
- the introduction of volatile anesthetic agent
- the use of nitrous oxide in the gas mixture
gas molecular weight at high-flow rates, changes in atmospheric pressure
At low (laminar) flow rates the bobbin height is determined by gas viscosity. At high (turbulent) flow rates the bobbin height is determined by gas density. Since gas density is directly proportional to the molecular weight of the gas, bobbin height during high flows is determined also by molecular weight.
pp. 68-69
Dorsch, JA, Dorsch, SE. A Practical Approach to Anesthesia Equipment. Philadelphia, PA: Lippincott Williams & Wilkins, 2011.
Problems inherent with the dye-dilution technique of measuring cardiac output include:
- the need for specialized pulmonary artery catheters
- mixed venous sampling is required
- background indicator buildup
- intrapulmonary shunting may cause measurement inaccuracy
background indicator buildup
The dye-dilution technique introduces the problems of indicator recirculation, arterial blood sampling and background indicator buildup.
pp. 112-113
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
The need for a return electrode to the electrocautery can be eliminated if:
- bipolar electrodes are used
- the patient is properly grounded
- an isolation transformer is used
- ultrahigh electrical frequencies are used
bipolar electrodes are used
Bipolar electrodes confine current propagation to a few millimeters, eliminating the need for a return electrode.
pg. 232
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
Pulse oximetry changes seen in carbon monoxide poisoning include a(n):
- decreased SpO2 levels
- falsely increased SpO2 levels
- SpO2 of 85% regardless of the actual SpO2
- augmentation of the pulsatile waveform
falsely increased SpO2 levels
Because carboxyhemoglobin and oxyhemoglobin absorb light at 660 nm identically, pulse oximeters will register a falsely high reading in patients with carbon monoxide poisoning.
pp. 320, 604
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
A 53-year-old man is undergoing a laparoscopic cholecystectomy. He is currently receiving 6% desflurane and oxygen at 3 L/min. A ventilator lacking fresh-gas-flow compensation is set to: TV = 700, Rate = 9, I:E = 1:2. This patient’s minute ventilation is:
7.3 L/min
Because the ventilator’s spill valve is closed during inspiration, fresh gas flow contributes to the minute ventilation (MV). With I:E = 1:2, fresh gas flow contributes to the MV 33% of the time. This results in an increase of minute ventilation of 1 L/min. The patients total MV is therefore (0.7 L)(9 breaths/min) + 1 L = 7.3 L.
pp. 275-276
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
Central venous pressure measurements should be made at the beginning or the end of exhalation:
- exhalation
- inspiration
- at the end of exhalation
- at the end of inspiration
at the end of exhalation
Measurement of CVP is made with a water column or transducer. The pressure should be measured during end expiration.
pg. 100
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
During exhalation, sticking of the spill valve of the ventilator can result in:
- inadequate patient ventilation
- the application of PEEP
- elevated carbon dioxide levels
- the application of negative airway pressure during exhalation
the application of positive end-expiratory pressure
The ventilator has its own pressure-relief valve, called the spill valve, which is closed during inspiration and open at the end of exhalation. Sticking of this valve results in abnormally elevated airway pressure during exhalation.
pg. 279
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
The decline in core temperature during the first hour of general anesthesia is largely due to:
- heat loss from conduction
- heat loss from convection
- heat loss from radiation
- redistrubiton of heat to cooler peripheral tissues
redistribution of heat to cooler peripheral tissues
Temperature decreases during general anesthesia can be grouped into 3 phases. Phase I is usually a decrease of 1 - 2o C that occurs during the first hour and is the result of redistribution of heat to cooler peripheral tissues. Phase II occurs over the next 3 - 4 hours and is a result of heat loss to the environment. During Phase III, a steady-state equilibrium is established between heat production and loss to the environment with little change in core temperature.
pg. 1184
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
The purpose of the bimetallic strip, commonly found in variable-bypass vaporizers, is to compensate for:
- changes in temperature
- changes in atmospheric pressure
- changes in fresh gas flow
- vaporizer output changes that occur with the introduction of nitrous oxide
changes in temperature
In the variable-bypass vaporizer, temperature compensation is achieved by a strip composed of two different metals welded together. The metal strips expand and contract differently in response to temperature changes and are used to alter the flows in the vaporizer.
pg. 61
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
Immediately after intubation, the capnogram below was obtained. This capnogram is consistent with:
bronchospasm
The sloping of Phase II and III of the capnogram indicates increased airway resistance and is consistent with bronchospasm or endotracheal tube kinking.
pg. 316
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
pg. 436
Dorsch, JA, Dorsch, SE. A Practical Approach to Anesthesia Equipment. Philadelphia, PA: Lippincott Williams & Wilkins, 2011.
When using the desflurane Tec 6 vaporizer at high elevations:
- the concentration of the agent is decreased
- the delivered partial pressure of the agent is decreased
- the concentration of the agent is increased
- the delivered partial pressure of the agent is increased
the delivered partial pressure of the agent is decreased
At high elevations, the Tec 6 vaporizer continues to deliver the set concentration. However, because of the decrease in the ambient pressure, the partial pressure of desflurane is decreased.
pg. 63
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.
During the administration of general anesthesia for a strabismus repair in a 4-year-old using a Mapelson D circuit, the capnogram below was obtained. This capnogram is consistent with:
inadequate fresh gas flow
Carbon dioxide elimination is entirely dependent on fresh gas flow in the Mapleson circuits. This capnogram demonstrates rebreathing, with a baseline that does not approach zero and is the result of inadequate fresh gas flow.
pg. 317
Nagelhout, JJ, and Plaus, KL. Nurse Anesthesia. St. Louis: Elsevier, 2013.
The intergranular air space of the carbon dioxide absorber is approximately:
- 10% of the total volume
- 25% of the total volume
- 50% of the total volume
- 75% of the total volume
50% of the total volume
To guarantee complete absorption, a patient’s tidal volume should not exceed the air space between absorbent granules. To ensure this, the carbon dioxide absorber has an intergranular air space of roughly 50% of the total volume, or approximately 1000 mL of air space.
pg. 39
Butterworth, JF, Mackey, DC, and Wasnick, JD. Morgan & Mikhail’s Clinical Anesthesiology. New York: Lange Medical Books/McGraw-Hill Medical Publishing Division, 2013.