VOCAB: CH 15 Airway Management, Respiration, and Artificial Ventilation Flashcards
Accessory muscles
Muscles that sometimes assist in breathing. They include the scalene muscles and the sternocleidomastoid, deep muscles in the neck and thorax, posterior neck and back muscles, pectoralis major, pectoralis minor, and abdominal muscles
Alveoli
Minute air sacs in the lungs through which gas exchange takes place between alveolar air and pulmonary capillary blood
Anatomic dead space
The volume of the conducting airways from the external environment down to the terminal bronchioles
Apneustic center
A group of neurons in the pons that has a stimulatory effect on the inspiratory center
Atelectasis
An abnormal condition characterized by the collapse of lung tissue. It prevents respiratory exchange of oxygen and carbon dioxide
Atmospheric pressure
The pressure of the gas around us, which varies with differences in altitude. At sea level, it is 760 mm Hg
Bilevel positive airway pressure (BPAP)
Airway support that combines partial ventilatory support and continuous positive airway pressure. It allows the pressure to vary during each breath cycle
Bohr effect
The property of hemoglobin by which an increasing concentration of protons and/or carbon dioxide reduces the oxygen affinity for hemoglobin
Boyle’s law
A gas law that states pressure and volume are inversely related, assuming a constant temperature
Capnography
The combination of a capnometric reading (numeric value) and a capnogram (graph/drawing)
Carina
A downward and backward projection of the lowest tracheal cartilage. It forms a ridge between the openings of the right and left primary bronchi
Compliance
The ease with which the lungs and thorax expand during pressure changes. The greater the compliance, the easier the expansion
Continuous positive airway pressure (CPAP)
Airway support that transmits positive pressure into the airways of a spontaneously breathing patient throughout the respiratory cycle at a constant pressure
Dalton’s law
A law stating that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressure of gases
Diaphragm
The dome-shaped, musculofibrous partition that separates the thoracic and abdominal cavities
Diffusion
The process by which solid, particulate matter in a fluid moves from an area of higher concentration to an area of lower concentration, resulting in an even distribution of the particles in the fluid
Expiration
Breathing out (exhalation); normally a passive process
Expiratory reserve volume
The amount of gas that can be forcefully exhaled after expiration of the normal tidal volume
External respiration
The transfer (diffusion) of oxygen and carbon dioxide between the inspired air and pulmonary capillaries
Extubation
Removal of an endotracheal tube
Fick principle
The assumption that the amount of oxygen delivered to an organ is equal to the amount of oxygen consumed by that organ plus the amount of oxygen carried away from the organ. This principle is used to determine cardiac output
Gag reflex
A normal neural response triggered by touching the soft palate or posterior pharynx
Henry’s law
A law stating that at a constant temperature, the amount of gas that dissolves in a liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid
Hering-Breuer reflex
A reflex in which afferent impulses from stretch receptors in the lungs arrest inspiration. Expiration then occurs. Inflation and deflation reflexes are triggered to prevent overinflation of the lungs
Hypocapnia
A state of diminished carbon dioxide in the blood; also called hypocarbia
Hypoxemia
A lower than normal oxygen content of the blood as measured in an arterial blood sample
Hypoxia
A state of decreased oxygen content at the tissue level