108 questions match your search.


Which of the following malfunctions causes the line isolation monitor to alarm?

BASIC Equipment & Physics

An isoflurane-specific vaporizer that is 25% full is mistakenly refilled with halothane, and the dial is set at 1.5%. Which of the following statements concerning this situation is true?

BASIC Equipment & Physics

During induction of anesthesia, a patient is breathing isoflurane from a semiclosed circle absorber system. The temperature-compensated vaporizer is set to deliver isoflurane 1.5%. Which of the following will result in the lowest inspired concentration of isoflurane?

BASIC Equipment & Physics

A radial artery catheter is to be used for blood pressure measurement during a sitting craniotomy. When zeroing the transducer, which of the following describes the best levels for placement of the transducer and opening of the system to air? (Transducer, Opening to Air)

BASIC Equipment & Physics Neuro

A 68-year-old patient is undergoing total hip replacement during general anesthesia using positive pressure ventilation and neuromuscular blockade. Intraoperative monitoring shows a gradual decrease in end-tidal CO2, an increase in exhaled tidal volume, and an increase in measured FiO2. Which of the following is the most likely cause of these changes?

BASIC Equipment & Physics

After removing the electrocautery pad from the thigh, a burn is noted at that site. Which of the following most likely contributed to this injury?

BASIC Equipment & Physics

On routine inspection of an anesthesia machine, the nitrous oxide E cylinder pressure is 360 psi. This indicates that the

BASIC Equipment & Physics

A waste-gas scavenger has an active disposal system. Which of the following safety features is necessary to prevent removal of excess gas from the breathing circuit?

BASIC Equipment & Physics

Recommendations for maximal allowable trace anesthesia gases are based on

BASIC Equipment & Physics

A burn is found at the site of the electrocautery pad. Which of the following is most likely?

BASIC Equipment & Physics

A 16-year-old child has an arterial catheter inserted prior to a potentially difficult intubation for a craniofacial operation. While awake and breathing room air, arterial blood gas values are: PaO2 134 mm Hg, PaCO2 28 mm Hg, and pH 7.45. These values can be explained by

BASIC Equipment & Physics

Compared with a semiclosed circle system, a closed system

BASIC Equipment & Physics

During extracorporeal shock wave lithotripsy, the shock wave should be synchronized with

BASIC Equipment & Physics

With direct arterial blood pressure monitoring

BASIC Equipment & Physics

A normal adult is receiving general anesthesia via a standard circle system and controlled ventilation. Mass spectrometer data are shown. Which event is most compatible with these data?

BASIC Equipment & Physics

While delivering nitrous oxide 1.5 L/min, oxygen 1.5 L/min, and halothane 1%, a leak in the oxygen flowmeter will most likely be detected by the

BASIC Equipment & Physics

While checking an anesthesia machine, opening the oxygen flow-control valve yields no oxygen flow, although the wall-mounted oxygen pipeline supply gauge reads 50 psig. Opening the backup oxygen cylinder results in normal oxygen flow. The most likely cause is

BASIC Equipment & Physics

Which of the following decreases dead space in an anesthetic circle system?

BASIC Equipment & Physics

Which of the following statements concerning the check valve of the common gas outlet on an anesthesia gas machine is true?

BASIC Equipment & Physics

The Bain circuit

BASIC Equipment & Physics

Which of the following is indicated by an alarm condition in the line-isolation monitor?

BASIC Equipment & Physics

Which Mapleson breathing circuit shown in the illustration permits the LEAST amount of fresh gas inflow to prevent rebreathing during spontaneous ventilation?

BASIC Equipment & Physics

Desflurane at a stable alveolar concentration of 7%

BASIC Equipment & Physics Pharmacology & Pharmacokinetics

Which of the following is most effective in decontaminating an anesthesia machine that was splattered with HIV-contaminated blood?

BASIC Equipment & Physics

Equipment that is attached to a patient should have leakage current no greater than

BASIC Equipment & Physics

One full E-cylinder of oxygen at 20°C can deliver 2 L/min of oxygen for at most

BASIC Equipment & Physics

Following antagonism of a nondepolarizing muscle relaxant with neostigmine, twitch height is normal. To achieve this effect, the percentage of the acetylcholine receptor pool that must be free of muscle relaxant is

BASIC Equipment & Physics Pharmacology & Pharmacokinetics

When inspired anesthetic gases are humidified

BASIC Equipment & Physics

Which of the following statements concerning use of a Bain circuit is true?

BASIC Equipment & Physics

During attempted cannulation of the right internal jugular vein, the exploring needle goes lateral to the vein. Which of the following structures is most likely to be encountered?

BASIC Equipment & Physics

The tracing shown is from a femoral artery catheter. Which of the following is the most likely explanation?

BASIC Equipment & Physics

Maximum current is delivered to the myocardium by a countershock for defibrillation when

BASIC Equipment & Physics

In the event of a leak in the air flowmeter, which flowmeter arrangement produces the lowest risk of delivering hypoxic gas mixtures?

BASIC Equipment & Physics

Which of the following is the greatest disadvantage of pressure-cycled ventilation?

BASIC Equipment & Physics Respiratory & Critical Care

An otherwise healthy 20-year-old man undergoes laser surgery for vocal cord polyp removal. During jet ventilation with 100% oxygen, arterial blood gas analysis shows PaO2 90 mmHg, PaCO2 40 mmHg, and pH 7.40. Which of the following is the most likely explanation?

BASIC Equipment & Physics

The trend plot shows end-tidal gases measured during a radical neck dissection. The event occurring at A is most likely

BASIC Equipment & Physics Respiratory & Critical Care General

Oxygen 100 ml/min is bubbled through a vaporizer containing an anesthetic with a vapor pressure of 150 mmHg, and this mixture is added to a fresh gas flow of 5 L/min. The delivered anesthetic concentration is

BASIC Equipment & Physics

During use of the ventilator on an anesthesia machine, positive pressure is noted on the airway pressure gauge during exhalation. Positive end-expiratory pressure has not been purposefully added to the breathing circuit. Which of the following is the most likely cause?

BASIC Equipment & Physics

The flow proportioning system on an anesthesia machine

BASIC Equipment & Physics

A 27-month-old, 14-kg infant with intestinal obstruction is anesthetized with nitrous oxide at 1 L/min, oxygen at 0.4 L/min, and halothane at 0.8% using a Bain circuit. Ventilation is controlled at a rate of 30/min. The child's temperature is 39°C, and the PaCO2 is 65 mmHg. Which of the following is most likely?

BASIC Equipment & Physics Pediatric

To detect the delivery of a hypoxic gas mixture, the optimal location for an oxygen analyzer in this circle is

BASIC Equipment & Physics

Leakage current and microshock hazards are eliminated by

BASIC Equipment & Physics

Arterial pressure in the radial artery is 155/70 mmHg measured by a correctly calibrated catheter-transducer system. At the same time, aortic pressure is 140/75 mmHg using a high-fidelity catheter tip transducer. The most likely cause of this discrepancy is

BASIC Equipment & Physics

A 30-year-old man who is undergoing laparotomy and resection of a large kidney tumor has a decrease in SpO2 from 100% to 92% and an increase in peak airway pressure from 20 to 35 cm H2O. Plateau pressure is unchanged at 18 cm H2O. Which of the following is the most likely cause?

BASIC Equipment & Physics Respiratory & Critical Care General

When using a Venturi face mask with a reservoir bag

BASIC Equipment & Physics

A healthy patient is receiving general endotracheal anesthesia with nitrous oxide 4 L/min, oxygen 2 L/min, and isoflurane 1% with spontaneous ventilation. The inspiratory breathing hose becomes disconnected from the inspiratory valve. The earliest alarm will be produced by

BASIC Equipment & Physics

The two E oxygen cylinders on an anesthesia machine have pressure readings of 1100 psi each. At an oxygen flow of 3 L/min, there will be sufficient oxygen for approximately

BASIC Equipment & Physics

The two E oxygen cylinders on an anesthesia machine have pressure readings of 1100 psi each. At an oxygen flow of 3 L/min, there will be sufficient oxygen for approximately

BASIC Equipment & Physics

Pulse oximetry accurately reflects SaO2 in which of the following situations?

BASIC Equipment & Physics

Which Mapleson breathing circuit permits the LEAST amount of fresh gas inflow to prevent rebreathing during spontaneous ventilation?

BASIC Equipment & Physics

Which of the following is characteristic of soda lime and Baralyme carbon dioxide absorption canisters used in circle systems?

BASIC Equipment & Physics

Which of the following is the most important function of temperature compensation in anesthetic vaporizers?

BASIC Equipment & Physics

Each of the following factors may lead to erroneous readings using pulse oximetry EXCEPT

BASIC Equipment & Physics

An sevoflurane vaporizer is filled with isoflurane and the vaporizer dial is set at 1%. Which of the following will occur?

BASIC Equipment & Physics

Proper handling of oxygen cylinders includes

BASIC Equipment & Physics

Which of the following vaporizer filling errors is most likely to result in inadvertent anesthetic overdose?

BASIC Equipment & Physics

During general anesthesia using a modern anesthesia machine, a patient's spontaneous ventilation is manually assisted with a fresh gas flow of 5 L/min. A sudden malfunction of the pressure-relief (pop-off) valve of the circle absorption system occurs, and the valve cannot be opened. The most appropriate next step is to

BASIC Equipment & Physics

In this diagram of a circle system, an increase in dead space is most likely to result from placement of the pressure relief valve at location

BASIC Equipment & Physics

In a normally functioning circle anesthesia system, if the length of the inspiratory and expiratory hose is doubled, the mechanical dead space will be

BASIC Equipment & Physics

In the operating room

BASIC Equipment & Physics

An 88-kg man is anesthetized with 66% nitrous oxide, 33% oxygen, and 1% isoflurane using a circle system. Following tracheal intubation, the nitrous oxide flow is set at 1 L/min and the oxygen flow is set at 0.5 L/min. After two hours the oxygen monitor indicates a circuit oxygen concentration of only 25% despite the flows noted above. The most likely explanation for this discrepancy is

BASIC Equipment & Physics

During anesthesia using the Bain circuit

BASIC Equipment & Physics

A 55-year-old man is undergoing craniotomy in the sitting position. Mean arterial pressure is 75 mmHg; arterial blood gas values are PaCO2 41 mmHg and pH 7.37. End-tidal CO2 is 7 mmHg. Which of the following is the most likely cause of the increased PaCO2 to PetCO2 gradient?

BASIC Equipment & Physics Respiratory & Critical Care

During steady-state intraoperative controlled mechanical ventilation, exhaled tidal volume will be increased by

BASIC Equipment & Physics

The fail-safe mechanism on an anesthesia machine is activated by

BASIC Equipment & Physics

During laser microsurgery of the larynx using an endotracheal tube, a fire occurs in the airway. Which of the following is the most appropriate initial management?

BASIC Equipment & Physics General

Which of the following decreases the risk for burns during electrocauterization?

BASIC Equipment & Physics

The vapor pressure of a volatile anesthetic depends on

BASIC Equipment & Physics

Which of the following is the most appropriate action after an anesthetic vaporizer is tipped?

BASIC Equipment & Physics

A 30-kg patient with asthma is receiving general anesthesia and being mechanically ventilated with a measured tidal volume of 300 mL. Increasing the fresh gas flow from 3 L/min to 9 L/min without changing the ventilatory rate or I:E ratio will result in

BASIC Equipment & Physics Respiratory & Critical Care

The gauge pressure on a cylinder of nitrous oxide

BASIC Equipment & Physics

The lungs of a 7-kg infant are being ventilated with a volume-cycled ventilator at a rate of 20/min. The anesthetic circuit has a compressible volume of 5 ml/cm H2O, and the peak inspiratory pressure is 20 cmH2O. To achieve adequate ventilation, the ventilator tidal volume should be set at

BASIC Equipment & Physics Pediatric

After inflation of both the tracheal and endobronchial cuffs of a left-sided double-lumen tube, the following are noted on auscultation of the chest: Left lumen clamped --> Breath sounds absent bilaterally; Right lumen clamped --> Breath sounds present on left only; Both lumens open --> Breath sounds present on left only. The most appropriate action is to

BASIC Equipment & Physics

Which of the following statements concerning monitoring of neuromuscular function during general anesthesia is true?

BASIC Equipment & Physics

Which of the following is most effective in preventing intraoperative hypothermia in adults?

BASIC Equipment & Physics

During direct intra-arterial measurement of blood pressure

BASIC Equipment & Physics

Postoperatively, a patient is being mechanically ventilated by a constant-flow, pressure-cycled ventilator with the following initial settings: inspiratory/expiratory (I/E) ratio of 1:2, peak inspiratory pressure (PIP) of 25 cmH2O, and rate of 10/min. One hour later, the I/E ratio is 1:4. Which of the following would ensure that the minute ventilation is the same as that initially set?

BASIC Equipment & Physics Respiratory & Critical Care

During general anesthesia administered through a circle system, the soda lime absorbant is exhausted. No fresh soda lime is available for use. Which of the following is the most appropriate next step to prevent hypercapnia in this patient?

BASIC Equipment & Physics

To detect the delivery of hypoxic gas mixture, the optimal location for an oxygen analyzer in this circle is

BASIC Equipment & Physics

A Fluotec vaporizer is set to administer halothane 4% using a fresh gas flow of 4 L/min. If the diluent gas flow is increased to 8 L/min, and at the same time the room temperature increases from 20 to 25°C, the approximate concentration of halothane delivered to the patient would be

BASIC Equipment & Physics

An unconscious adult patient is being ventilated through an esophageal obturator airway (EOA) in the emergency department. In the absence of cervical spine injury, which of the following is appropriate?

BASIC Equipment & Physics General

Two opened oxygen cylinders, one full and one empty, are attached to an anesthesia machine. The check valve to the empty cylinder fails. This is expected to result in

BASIC Equipment & Physics

Electrocautery units operate at frequencies between 300 kHz and 2 mHz to

BASIC Equipment & Physics

The accuracy of oxyhemoglobin saturation determined by digital pulse oximetry is affected significantly by each of the following EXCEPT

BASIC Equipment & Physics

During anesthesia with nitrous oxide, oxygen, and a relaxant, the patient's lungs are being mechanically ventilated and there is a heated humidifier in the circuit. The most likely cause of an apparent increase in inspired oxygen concentration is

BASIC Equipment & Physics

With respect to mechanical ventilation, which of the following statements concerning the portion of tidal volume known as compression volume is true?

BASIC Equipment & Physics

Which of the following is a characteristic of the Bain breathing circuit?

BASIC Equipment & Physics

Arterial pressure in the radial artery is 155/70 mmHg measured by a correctly calibrated catheter-transducer system. At the same time aortic pressure is 140/75 mmHg using a high-fidelity catheter tip transducer. The most likely cause of this discrepancy is

BASIC Equipment & Physics

Which of the following combinations of anesthetic and incorrect vaporizer results in the smallest error in delivered concentration?

BASIC Equipment & Physics

A 35-kg child requires mechanical ventilation with pure oxygen at a tidal volume of 350 ml and a rate of 20/min during a severe asthma attack. The most likely cause of severe hypotension after initiating mechanical ventilation is

BASIC Equipment & Physics Respiratory & Critical Care Pediatric

Which property of oxygen is detected by the fail-safe device on the anesthesia machine?

BASIC Equipment & Physics

Which of the following will occur if the top of the oxygen flowmeter is cracked and leaking during anesthesia with nitrous oxide and oxygen?

BASIC Equipment & Physics

Which of the following statements concerning anesthesia machine flowmeters is true?

BASIC Equipment & Physics

The capnographic tracing is from a 2-month-old infant anesthetized using a pediatric circle system and mask at a fresh gas flow of 4 L/min. The sampling port is in the elbow connector. This tracing indicates

BASIC Equipment & Physics Pediatric

The pin index system

BASIC Equipment & Physics

Measurement of blood pressure with a Doppler device involves

BASIC Equipment & Physics

A patient whose trachea is intubated develops partial airway obstruction two hours after induction of fentanyl, nitrous oxide, oxygen anesthesia. The anesthesiologist discontinues the nitrous oxide and controls ventilation, and there is gradual improvement during the next hour. No evidence of a respiratory disorder is found at the conclusion of the anesthetic. Which of the following is most likely?

BASIC Equipment & Physics

An air/oxygen blender with E-size cylinders is supplying gas to a Mapleson D circuit being used to ventilate a neonate during transport. The air tank is full (psi= 1900/625 L) and flow is 4 L/min. The oxygen tank flow is 5 L/min and the pressure gauge indicates 500 psi. If the flow rates remain unchanged, which of the following statements is correct?

BASIC Equipment & Physics

Which of the following neurophysiologic monitoring modalities is LEAST affected by administration of volatile anesthetic agents?

BASIC Equipment & Physics

An anesthesia machine is set to deliver oxygen 2 L/min, nitrous oxide 2 L/min, and sevoflurane. After 30 minutes of stable anesthesia, which of the following, is the most likely cause of a decrease in the oxygen analyzer reading from 50% to 30%?

BASIC Equipment & Physics

Which of the following statements concerning absorption of carbon dioxide by soda lime in an anesthetic circuit is correct?

BASIC Equipment & Physics

While delivering nitrous oxide 1.5 L/min, oxygen 1.5 L/min, and sevoflurane 2%, a leak in the oxygen flowmeter would most likely be detected by the

BASIC Equipment & Physics

If the low-pressure alarm of an anesthesia circuit is broken, which of the following monitors will provide the earliest indication of a disconnected ventilator hose?

BASIC Equipment & Physics

During surgery with a carbon dioxide laser, which inhaled gas mixture is LEAST likely to promote combustion of the endotracheal tube?

BASIC Equipment & Physics

Desflurane is delivered using a vaporizer that contains internal heaters because

BASIC Equipment & Physics Pharmacology & Pharmacokinetics

A healthy, 18-year-old, 65-kg woman undergoing diagnostic laparoscopy is being monitored with a properly functioning and calibrated capnograph. The end-tidal carbon dioxide concentration is 6%, and the inspired carbon dioxide concentration is 1%. This may be caused by each of the following EXCEPT

BASIC Equipment & Physics

Proper zeroing of an arterial pressure transducer attached to a supine anesthetized patient is best accomplished by

BASIC Equipment & Physics

The most likely cause of this capnographic tracing obtained just after laryngoscopy and intubation is

BASIC Equipment & Physics General