How Well Do You Know About Human Respiration? Respiration is the act in which the body takes in oxygen from the outside environment into the tissues in the body and then removes carbon dioxide from the tissues into the external...
Questions: 12 | Attempts: 15397 | Last updated: Oct 5, 2020
Respiratory failure is a condition in which the blood does not have enough oxygen or has too much carbon dioxide or sometimes both. It is often deadly as the required exchange of oxygen and carbon dioxide does not happen leading...
Questions: 5 | Attempts: 1558 | Last updated: Dec 9, 2019
A 73-year-old man with hypertension, coronary artery disease, and diabetes mellitus presents to your office complaining of cough and shortness of breath. He reports that for the past 3 or 4 days, he has been experiencing progressive dyspnea on exertion, and he now has mild dyspnea at rest. He also states that he has been having fevers, chills, and purulent sputum production over this period. He denies having come into contact with anyone who was sick. Results of physical examination are as follows: blood pressure, 124/87 mm Hg; heart rate, 95 beats/min; respiratory rate, 26 breaths/min; temperature, 101.3° F (38.5° C); and oxygen saturation on room air, 88%. The patient exhibits tachypnea without the use of accessory muscles. Bronchial breath sounds are noted over the right lower lung zones consistent with consolidation. A chest radiograph in the office confirms a right lower lobe infiltrate. You plan to admit the patient to the hospital for intravenous antibiotics and further monitoring.
Which of the following is a likely cause of this patient's low oxygen saturation?