TMC Practice exam 25 questions 1

TMC Practice exam 25 questions #1

Which of the following equipment is most helpful at measuring FRC in a patient who has significant non-ventilated lung spaces? >>>>plethysmograph

You can determine FRC in three different ways - body box, nitrogen washout, or helium dilution. If someone has non-ventilated lung space, nitrogen washout and helium dilution are not helpful and may be inaccurate. FRC determined by body box will be higher because it can access non-ventilated lung space and therefore is more accurate.

The respiratory therapist is making a home visit to evaluate an oxygen-dependent patient. The patient has 3+ pitting peripheral edema and has not followed the physician's orders to limit fluid intake. You would expect which of the following hemodynamic values? >>>>elevated right sided preload with a normal to low right ventricular after load

Right-sided preload is another name for CVP (central venous pressure). Peripheral edema is one of the signs associated with right heart failure, which results in an elevated CVP with a normal or low pulmonary artery pressure (PAP), a.k.a. right ventricular afterload.

A ventilator-dependent patient is scheduled for an MRI, which will require a transport of 90 minutes. The patient is receiving humidification with a heated- humidification system.A transport ventilator is available. How should a respiratory therapist assure that humidification will be provided to the patient during the MRI procedure? >>>>Provide an HME

A heat moisture exchanger (HME) is appropriate for a transport of only 90 min.Furthermore, the scenario does not suggest that the patient has thick, retained secretions, therefore an HME may be applied.

which of the following can accurately be stated about a widening alveolar-arterial oxygen gradient? >>>>increased intrapulmonary shunting

A normal alveolar arterial oxygen gradient is below 65 mmHg. When that gradient rises to 200, 300, 400, or more, then you have what is called shunting. If the A-a gradient is less than 300 it's technically called a ventilation perfusion (VQ) mismatch. But generally speaking, as the gradient widens it can properly be said that there is an increase in pulmonary shunting.

How many hours will an H cylinder with 1400 psi last for a patient receiving oxygen at 7 lpm? >>>>10hrs And H cylinder has a tank factor of 3.14. 3.14x1400 PSI = 4396 L. 4396 L / 7 L per minute = 628 min. 628 min./ 60 min.= 10.4 hours, or about 10 hours. When you get an

answer that is not exact, pick the closest number possible. It is common on the exam not see the exact answer

A bronchopleural fistula on a patient receiving mechanical ventilation with a chest tube drainage system in place would be most likely be indicated by which of the following observations? >>>>excess bubbling in the water seal chamber

A bronchopleural fistula is essentially a leak from the airway in the lungs to the pleural space. This condition can result in two things - one) a low-pressure or low-volume alarm, 2) excess bubbling in the water seal chamber of the chest tube drainage system.When you look at the answers, a leak would not cause a high pressure alarm

The best test determination for a forced vital capacity maneuver is done by which of the following calculations? >>>>FEV1 + FVC

To determine the best trial or best patient effort for a forced vital capacity maneuver, the trial with the highest sum of the FEV1 and FVC is considered to be the patient's best effort.

Which of the following medications would be helpful at reversing the affect of a benzodiazepine medication? >>>>Romazicon

Romazicon is the only medication on the list that can reverse the effects of benzodiazepines.

A mechanically ventilated patient who with an 8.0 mm trachestomy tube in place has a strong cough, but is unable to expectorate thick, dry secretions. During an attempt to suction the patient, the tube becomes dislodged, but promptly placed back to its proper position. Following the procedure, the respiratory therapist notes dry crackles in the right upper lobe and neck upon auscultation. These breath sounds would most likely be associated with >>>>subcutaneous emphysema

In this scenario the respiratory therapist should assume that while the tube was dislodged, breaths delivered by the ventilator caused air to be forced into soft tissue areas under the skin outside of the trachea. This condition is known as subcutaneous emphysema. Auscultation reveals dry crackles and crepitus upon palpation.

An emergency room physician orders an arterial blood gas with Carboxyhemoglobin level. This exam will help the physician determine which of the following? >>>>CO

Carboxyhemoglobin (COHb) levels are determined with an instrument called a co- oximeter, which directly measures arterial blood COHb. Both carbon monoxide poisoning and evidence of smoking, or exposure to cigarette smoke can be determined with the COHb level.

What is the relative humidity of the inspired gas of a patient who is intubated if the humidity deficit is 33 mg/L? >>>>25%

There are 44 mg of water per liter of gas if the gas is at 100% relative humidity. If you have only 11 mg/L of gas (deficit of 33 mg) then you have only 25% relative humidity because 11 mg is 25% of 44.hg

A patient with acute epiglottitis is awaiting transport to surgery for a tracheotomy under anesthesia. SpO2 is 88% on room air. While waiting the patient would benefit most from which of the following? >>>>heliox therapy with 60%/40% mixture

The patient has an arterial oxygen saturation of 88% on room air. This is consistent with hypoxemia and indicates a need for supplemental oxygen. Because the patient has acute epiglottitis, Heliox therapy is appropriate to reduce airway resistance. Additionally, the patient would benefit from an adult therapeutic dose of oxygen, which starts at 40%.Therefore, 60-40% Heliox mixture is most appropriate.

An MVA victim with severe facial trauma has been trached in the emergency room. The respiratory therapist should now provide.. >>>>heated/humidified aerosol at FIO2 1.0

In this example, the patient's natural upper airway has been by-passed and the respiratory therapist should be concerned about delivery of cold dry gas. Heat and humidification are the therapist's primary concern. 100% oxygen is also necessary due to the emergent nature of the patient's condition having suffered a motor vehicle accident.

A patient is receiving a positive pressure treatment through a fenestrated tracheostomy tube. To prepare the patient to be able to speak, the respiratory therapist should FIRST >>>>deflate the cuff

When a patient has a fenestrated tracheostomy tube and requires transitioning from a positive pressure ventilation configuration to a speaking configuration, the first step is to deflate the cuff.

The respiratory therapist should discontinue beta sympathomimetic aerosol therapy in which of the following scenarios? >>>>The patient experiences nausea and tingling in their extremities

Prior to obtaining an MIP value with a pressure manometer, the respiratory therapist notes the needle is pointing at a positive pressure of 7 cm H2O prior to the maneuver.During the MIP maneuver, the needle reaches -20 cmH2O. The therapist should >>>>record an MIP of -27 cmH2O

Although -20 cmH2O is observed on the pressure manometer, the real pressure being produced is -27 cmH2O. This is because the manometer is not properly calibrated to zero. Therefore, an adjustment must be accounted for when taking a measurement.

You must add the number that the needle is pointing to prior to the maneuver to the number achieved by the patient during the maneuver to get an accurate measurement.

A patient who is receiving mechanical ventilation in the assist/control mode with a PEEP of 10 cmH2O is being manually ventilated during a transport to CT scan. During the transport, the respiratory therapist notices desaturation and feels the PEEP should be increased. To do this, the therapist should >>>>increase the tension on the PEEP spring

A patient with diabetes has significant respiratory distress. Arterial blood gases reveal a pH of 7.10, PaCO2 of 29 torr, and a PaO2 of 81 torr. The patient has a spontaneous tidal volume of 700 mL and a respiratory rate of 30/min. The patient is receiving 100% oxygen by an air entrainment device with the flow at 15 L/min. Which of the following will help the patient and is the most appropriate action? >>>>utilize a tandem device

Although this patient is showing obvious signs of ventilatory failure the options given do not allow us to address that problem. The options given relate to a correction of the oxygenation status of the patient. If you look closely you will see that the total gas flow to the patient at 100% at 15 L per minute is insufficient to keep up with the patient's inspiratory demand. Some simple math, multiplying 600 mL times a rate of 30 per minute is equal to a minute ventilation of 18 L/min. But, the patient is receiving only 15 L/min. To correct this problem and meet or exceed the patient's inspiratory demand, the best option is to utilize a tandem device, or a side-by-side large volume nebulizer. This will double the total flow to the patient to be 30 L/min, which will exceed the patient's inspiratory demand

If a pressure-cycled mechanical ventilator had a leak in the circuit, what would the respiratory therapist expect to see? >>>>The mechanical breaths would not cycle off as expected

In pressure-cycled mechanical ventilation the positive pressure breaths stop once the preset pressure is reached. If the circuit has a leak the preset pressure cannot be reached, and therefore the machine will fail to cycle into exhalation.

What would occur on a time-cycled ventilator with a fixed rate if the inspiratory flow rate were reduced? >>>>decrease in tidal volume

On a time cycle ventilator, with a fixed rate and a fixed inspiratory time, if inspiratory flow rate is decreased, the result would be a decrease in tidal volume.

Which of the following indicate a patient is ready to wean from mechanical ventilation?>>>>VT of 6 mL/kg

In order to wean from the ventilator the MIP must be more than -28 cmH2O. Tidal volume must be at least 5 mL per kilogram and RSBI must be less than 106. The alveoli-arterial oxygen difference (A-a gradient) must be less than 300 mmHg. In this