41 Questions
What are the two main causes of CO2 retention mentioned in the text?
Hypoventilation and ventilation-perfusion inequality
Which condition causes hypoxemia due to impaired diffusion across the alveolar-capillary unit?
Pneumonia
Which condition results in mental confusion, tachycardia, lactic acidosis, and proteinuria when PaO2 falls below 50 mmHg?
Hypoventilation
What is the characteristic feature of Right-to-Left Shunt?
Blood reaches arterial system without passing through ventilated regions of the lung
In which condition would administering 100% O2 not correct the hypoxemia?
Right-to-Left Shunt
Which type of sleep apnea involves apnea due to obstruction during inspiration?
Obstructive sleep apnea
Which of the following exacerbates Ventilation-Perfusion Inequality?
Decreased cardiac output
What is the common finding associated with central sleep apnea?
Small periods of no respiratory effort
What is the primary cause of hypoxemia in patients with COPD?
Ventilation-Perfusion Inequality
Which condition can double PCO2 to 80 mmHg but only decrease PAO2 from 100 to 60 mmHg?
Hypoventilation
What PFT result would you expect in the 63-year-old woman with a 30 pack-year smoking history, FEV1 of 59%, FEV1/FVC ratio of 0.62, and large lung volumes on CXR?
Increased residual volume
Apart from rapid, shallow breathing, what is a characteristic of pulmonary edema with alveolar filling?
Arterial hypoxemia cannot be abolished by inspiring 100% O2
In the 65-year-old female with hemorrhagic shock and a drop in blood pressure after intubation, what is the most likely cause of her hypotension?
Decrease in venous return
Which of the following is a common feature of all COPDs?
Dynamic compression of airways
What is the strongest predisposing factor for asthma?
Production of IgE antibodies to allergens (atopy)
What is a characteristic feature of chronic bronchitis in COPD?
Hypertrophy of mucous glands in larger airways
Which of the following is a type of emphysema usually caused by cigarettes?
Centriacinar
What contributes to luminal narrowing in chronic bronchitis?
Patchy squamous metaplasia
What is a characteristic of asthma related to smooth muscle tone?
Increased airway inflammation
What is a common feature of emphysema in COPD?
Alveolar destruction with loss of elastic recoil
What is the most common etiology of chronic bronchitis in COPD?
Cigarette smoking
What contributes to ventilation-perfusion inequality in all COPDs?
Hypoxemia with or without CO2 retention
Which type of emphysema results from alpha 1-antitrypsin deficiency?
Panacinar
Which cells play a crucial role in clearing inhaled particles in the terminal airways and alveoli?
Macrophages
What is the primary function of the mucociliary escalator in the respiratory tract?
To propel particles towards the pharynx for removal
Which pollutant is predominantly removed from the respiratory tract by impaction or sedimentation?
Large aerosol particles
What effect does cigarette smoke have on alveolar macrophages?
Inhibits their function in ingesting foreign particles
How do alveolar macrophages contribute to innate immunity in the lung?
Clearing substances through phagocytosis
Which component of cigarette smoke can bind preferentially to hemoglobin?
Carbon monoxide
What is the primary function of the upper viscous gel layer in the mucociliary escalator?
Trapping particles to be moved towards pharynx
What is a common function of masks, such as N95 respirators, in reducing respiratory exposure to pollutants?
Reducing shedding and contamination through physical barriers
In emphysema, the primary pathogenesis involves hypertrophy of mucous glands and increased mucous hypersecretion.
False
A patient with chronic bronchitis may exhibit excessive expectoration of sputum due to diminished mucociliary clearance function.
True
Asthma is characterized by a non-inflammatory process primarily affecting the airway smooth muscle tone.
False
Ventilation-perfusion inequality in COPDs can lead to hypoxemia with or without CO2 retention.
True
COPD encompasses chronic bronchitis and asthma, both of which are characterized by airway inflammation and reversible airway obstruction.
False
Mechanical ventilation can only be delivered invasively with positive pressure ventilation.
False
Continuous positive airway pressure (CPAP) maintains airway pressure below zero cm H2O.
False
Oxygen therapy can lead to absorption atelectasis when high FiO2 is administered.
True
Positive end-expiratory pressure (PEEP) is not commonly used during mechanical ventilation.
False
Volume control mode in mechanical ventilation delivers a preset volume regardless of changes in lung compliance or airway resistance.
True
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