TMC Practice exam 25 questions with correct answers|100% verified

TMC Practice exam 25 questions with correct answers Which of the following equipment is most helpful at measuring FRC in a patient who has significant non-ventilated lung spaces? Answer 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? Answer 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? Answer 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? Answer 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? Answer 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? Answer 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