TMC Practice Exam 1 questions with correct answers|100% verified|41 pages

TMC Practice Exam 1 questions with correct answers You note in the chart of a patient's who is receiving volume control ventilation that the plateau pressure has been increasing over the last 6 hours, while the PEEP levels remains constant. Which of the following would be the most likely cause of this change? Select one: A. development of pulmonary edema B. water accumulation in the ventilator circuit C. partial obstruction of the endotracheal tube D. development of bronchospasm Answer An increase in the plateau pressure relative to baseline (Pplat-PEEP) indicates a decrease in the patient's lung and/or thoracic compliance. Common causes of a decrease in lung compliance are pneumothorax, pulmonary edema, atelectasis and ARDS. Partial obstruction of the ET tube and development of bronchospasm would increase airway resistance and thus increase PIP and the PIP-Pplat pressure difference, but not affect Pplat. The correct answer is: development of pulmonary edema The difference between the mean arterial pressure (MAP) and intracranial pressure (ICP) is the: Select one: A. cerebral perfusion pressure B. cerebral vascular resistance C. blood-brain barrier pressure D. jugular venous pressure Answer The difference between the mean arterial pressure (MAP) and intracranial pressure (ICP) is the cerebral perfusion pressure (CPP); CPP = MAP - ICP. As this equation makes clear, any factor that increases ICP and/or lowers MAP will decrease CPP and thus potentially cause brain damage or death. In general perfusion is adequate if the CPP can be maintained between 60 to 100 mm Hg. The correct answer is: cerebral perfusion pressure Which of the following would provide the best bedside assessment of the need for mechanical ventilation in a patient with Guillain-Barre syndrome? Select one: A. FRC B. VC C. airway resistance D. TLC Answer Guillain-Barre syndrome is a restrictive neuromuscular disorder that results in hypoventilation. Airway resistance measures are not useful in diagnosing restrictive ventilatory impairments. Restrictive ventilatory impairments are characterized by low lung volumes. Of the volumes listed, only the vital capacity (VC) can be measured at bedside The correct answer is: VC The normal range of adult blood pressure (systolic/diastolic) is about: Select one: A. 80-100/40-70 mm Hg B. 100-140/60-90 mm Hg C. 120-140/90-100 mm Hg D. 130-150/100-110 mm Hg Answer Normal systolic pressure range from 100 to 140 mm Hg, with an average of 120 mm Hg. Normal diastolic pressures range from 60 to 90 mm Hg, with an average of 80 mm Hg. The blood pressure is recorded with systolic listed over diastolic; i.e., 120/80 mm Hg. The correct answer is: 100-140/60-90 mm Hg A patient admitted to the ED exhibits wheezing and hypoxemia on room air. Lab tests indicate a normal B-type natriuretic peptide (BNP) level. Which of the following conclusion can you draw from these findings? Select one: A. renal function likely is normal B. a myocardial infarction is likely C. congestive heart failure is unlikely D. liver function likely is normal Answer B-type natriuretic peptide (BNP) is a cardiac neurohormone secreted from membrane granules in the cardiac ventricles as a response to ventricular volume expansion and pressure overload. BNP levels that are less than 100 pg mL (normal is 20 pg/mL) tend to rule out diagnosis of CHF, while values exceeding 500 pg/mL help rule in this diagnosis. Intermediate values are less helpful and may occur in conditions with similar symptoms, including renal insufficiency, cor pulmonale, and acute pulmonary embolism. The correct answer is: congestive heart failure is unlikely Normal lung compliance is approximately: Select one: A. 0.1 - 0.4 L/cm H2O B. 0.4 - 0.8 L/cm H2O C. 10 - 15 L/cm H2O D. 15 - 20 L/cm H2O Answer Normal compliance of the adult lung ranges from 0.1 to 0.4 L/cm H2O, with an average value of about 0.2 L/cm H2O. The volume component of the compliance is measured as the inhaled volume at any given pressure change. The pressure component represents the difference between the alveolar and pleural pressures (the transpulmonary pressure gradient). The correct answer is: 0.1 - 0.4 L/cm H2O Within one second after initiating a forced vital capacity (FVC) maneuver, a patient with normal lungs should be able exhale what percent of the FVC? Select one: A. 35-50% of the FVC B. 50-70% of the FVC C. 70-83% of the FVC D. 84-93% of the FVC Answer The normal range for the FEV1 as a percent of the FVC (FEV1%) is 70-83%. Patients with obstructive pulmonary disease will show a reduction in timed FEV% values, while patients with restrictive disorders will generally exhibit normal (or sometimes high) FEV% values. The correct answer is: 70-83% of the FVC