Breath of Fresh Air
This test directly measures arterial oxygen saturation (SaO₂).
What is arterial blood gas (ABG) analysis?
Approximately this percentage of oxygen in the blood is transported bound to hemoglobin.
What is about 98%?
This brainstem structure is known as the pacemaker of respiration.
What is the pre‑Bötzinger complex?
Low‑pitched, soft breath sounds normally heard over peripheral lung fields are called these.
What are vesicular breath sounds?
Each 1 L/min increase in oxygen delivered via nasal cannula raises FiO₂ by approximately this amount.
What is about 4%?
During quiet breathing at rest, air leaves the lungs primarily due to this mechanism.
What is passive elastic recoil of the lungs?
Most carbon dioxide in the bloodstream is transported in this chemical form.
What is bicarbonate?
Central chemoreceptors primarily respond to changes in this substance through alterations in cerebrospinal fluid pH.
What is carbon dioxide?
Airway narrowing is most commonly associated with this abnormal lung sound.
What are wheezes?
This ventilator setting prevents alveolar collapse at the end of expiration.
What is PEEP?
This pressure remains sub‑atmospheric throughout the entire breathing cycle and helps keep the lungs expanded.
What is intrapleural pressure?
***Daily Double!*** This pulmonary function test measures tidal volume, inspiratory reserve volume, expiratory reserve volume, and vital capacity, but cannot directly measure residual volume.
What is spirometry?
These pulmonary receptors are stimulated by pulmonary edema and can trigger rapid, shallow breathing.
What are J (juxtacapillary) receptors?
This high‑pitched, inspiratory sound indicates upper airway obstruction and is commonly associated with croup or epiglottitis.
What is stridor?
An ABG with a pH of 7.31, PaCO₂ of 50 mmHg, and an HCO3- of 23 indicates this acid–base disorder.
What is uncompensated respiratory acidosis?
When the thoracic cavity expands during inspiration, this pressure falls below atmospheric pressure to allow airflow into the lungs.
What is intrapulmonary pressure?
An FEV₁ of 2.0 L, FVC of 3.0 L, and an FEV₁/FVC ratio of 67% indicate this ventilatory defect characterized by reduced airflow and difficulty with expiration.
What is obstructive pulmonary disease?
***Daily Double!*** This respiratory center is primarily responsible for controlling inspiration during quiet breathing.
What is the dorsal respiratory group?
A PaO₂ value below this level is used clinically to define hypoxemia.
What is 60 mmHg?
This positive airway pressure device automatically adjusts pressure to maintain airway patency in patients with sleep apnea.
What is APAP (auto‑titrating positive airway pressure)?
Hyperinflated lungs that limit diaphragmatic excursion most commonly occur in this chronic respiratory condition.
What is COPD?
This lung disease pattern presents with a normal or increased FEV₁/FVC ratio, reduced FVC, and normal airflow due to limited lung expansion.
What is restrictive lung disease?
During high‑intensity exercise, this respiratory center increases activity to meet increased ventilatory demands.
What is the ventral respiratory group?
This condition describes right‑sided heart failure caused by long‑standing pulmonary disease and pulmonary hypertension.
What is cor pulmonale?
This autosomal recessive disorder is caused by a CFTR gene mutation leading to defective chloride transport and thick secretions affecting multiple organs.
What is cystic fibrosis?