(Summary) Paramedic Airway FISDAP Review Part 1 Questions with 100% Correct Answers | Updated & Verified 2024.
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(Summary) Paramedic Airway FISDAP Review Part 1 Questions with 100% Correct Answers | Updated & Verified 2024.
Appropriate airway management
Steps must be performed in order. Bypass steps that do not apply.
a. Open and maintain a patent airway.
b. Recognize and treat airway obstructions.
c. ...
(Summary) Paramedic Airway FISDAP Review
Part 1 Questions with 100% Correct Answers |
Updated & Verified 2024.
Appropriate airway management
Steps must be performed in order. Bypass steps that do not apply.
a. Open and maintain a patent airway.
b. Recognize and treat airway obstructions.
c. Assess ventilation and oxygenation status.
d. Administer supplemental oxygen.
e.Provide ventilatory assistance.
Upper airway
Consists of all anatomic airway structures above the glottic opening.
1. Tongue
a. Must be manipulated
b. Tends to fall back into the posterior pharynx in unresponsive patient
2. Pharynx
a. Muscular tube that extends from the nose and mouth to the esophagus and trachea
b. Composed of:
i. Nasopharynx
ii. Oropharynx
iii. Laryngopharynx (hypopharynx)
Lower airway
Extends from the glottis to the pulmonary capillary membrane.
1. Larynx
2. Thyroid cartilage
3. Cricoid cartilage (cricoid ring)
4. Cricothyroid membrane
5. Glottis
6. Trachea
1. Larynx
-Complex structure formed by many independent cartilaginous structures
-Marks where the upper airway ends and lower airway begins
2. Thyroid cartilage
-Shield-shaped structure formed by two plates that join in a "V" shape anteriorly to form
the laryngeal prominence
i. Known as the Adam's apple
ii. More pronounced in men
iii. Can be difficult to locate in obese or short-necked patients
-Suspended from the hyoid bone by the thyroid ligament
-Directly anterior to the glottic opening
3. Cricoid cartilage (cricoid ring)
,-Lies inferiorly to the thyroid cartilage
-Forms the lowest portion of the larynx
-More prominent in females
4. Cricothyroid membrane
-Located between the thyroid and cricoid cartilage
-Site for emergency surgical and nonsurgical access to the airway
-Bordered laterally and inferiorly by the highly vascular thyroid gland
5. Glottis
-Narrowest portion of the adult airway
-Vocal cords are located at the lateral borders of the glottis.
-Epiglottis is located at the superior border of the glottis.
-ET intubation requires visualizing the epiglottis, glottis, and vocal cords before inserting
the ET tube.
6. Trachea
-Immediately descends into the thoracic cavity
-Not a straight tube, which is key to understand when placing an ET tube
The respiratory and cardiovascular systems work together to ensure that:
1. A constant supply of oxygen and nutrients is delivered to every cell.
2. Waste products are removed from every cell.
Ventilation
-Physical act of moving air into and out of the lungs
1. Inhalation is the active, muscular part of breathing.
2. Exhalation is a passive process and does not normally require muscular effort.
Oxygenation
-Process of loading oxygen molecules onto hemoglobin molecules in the bloodstream
-Requires adequate FiO2 (Percentage of oxygen in inhaled air)
Respiration
-Process of exchanging O2 and CO2-->
1. External respiration (Also called pulmonary respiration): Process of exchanging
O2 and CO2 between the alveoli and blood in pulmonary capillaries.
2. Internal respiration (Also called cellular respiration): Exchange of O2 and CO2
between the systemic circulation and the body's cells.
Pathophysiology of Respiration
-Multiple conditions can inhibit the body's ability to effectively provide oxygen to cells.
1. Disruption of pulmonary ventilation, oxygenation, and respiration will cause
immediate effects on the body.
a. Must be recognized and corrected immediately
b. Important to distinguish a primary ventilation problem from a primary oxygenation or
respiration problem
2. Every cell needs a constant supply of oxygen to survive.
a. Some tissues are more resilient than others.
b.Sufficient levels of external respiration and perfusion are required.
3. Hypoxia, ventilation-perfusion ratio and mismatch, factors affecting ventilation, factors
affecting oxygenation and respiration, and acid-base balance.
,1. Hypoxia
Tissues and cells do not receive enough oxygen --> Death may occur quickly if not
corrected.
- Varying signs and symptoms
a. Onset and degree of tissue damage often depend on the quality of ventilations.
b. Early signs include restlessness, irritability, apprehension, tachycardia, and anxiety.
c. Late signs include mental status changes, a weak pulse, and cyanosis.
d. Responsive patients often report dyspnea and may not be able to speak in complete
sentences.
-Best to administer oxygen before signs and symptoms appear
2. Ventilation-perfusion ratio and mismatch
-Air and blood flow must be directed to the same place at the same time (ventilation and
perfusion must be matched).
-Failure to match ventilation and perfusion (V/Q mismatch) lies behind most
abnormalities in oxygen and carbon dioxide exchange.
-In most people, normal resting minute ventilation is approximately 6 L/min.
a. Resting alveolar volume: Approximately 4 L/min
b. Pulmonary artery blood flow: Approximately 5 L/min
c. Overall ratio of ventilation to perfusion: 4:5 L/min, or 0.8 L/min
-Because neither ventilation nor perfusion is distributed equally, both are distributed to
dependent regions of the lungs at rest. However, an increase in gravity-dependent flow
is more marked with perfusion than with ventilation.
--> Ratio of ventilation to perfusion is highest at the apex of the lung and lowest at the
base.
-When ventilation is compromised but perfusion continues:
a. Blood passes over alveolar membranes without gas exchange.
b. CO2 is recirculated into the bloodstream.
i. Results in V/Q mismatch
ii. Could lead to severe hypoxemia if not recognized and treated
-When perfusion across the alveolar membrane is disrupted:
a. Less O2 is absorbed into the bloodstream; less CO2 is removed (V/Q mismatch).
b. Can lead to hypoxemia --> Immediate intervention is needed to prevent further
damage or death.
3. Factors affecting ventilation
A patent airway is critical for the provision of O2 to tissues. Intrinsic and extrinsic factors
can cause airway obstruction.
1. Intrinsic factors: infection, allergic reactions, and unresponsiveness.
a. The tongue is the most common obstruction in an unresponsive patient.
b. Some factors are not necessarily directly part of the respiratory system. Ex...
, i. Interruptions in the central and peripheral systems.
ii. Medications that depress the central nervous system.
iii. Trauma to the head and spinal cord.
iv. Neuromuscular disorders.
v. Neuromuscular blocking agents.
c. Allergic reactions
i. Swelling (angioedema) can obstruct the airway.
ii. Bronchoconstriction can decrease pulmonary ventilation.
2. Extrinsic factors: trauma and foreign body airway obstruction.
a. Trauma to the airway or chest --> Requires immediate evaluation and intervention
b. Blunt or penetrating trauma and burns can disrupt airflow through the trachea and
into the lungs --> Quickly results in oxygenation deficiencies
c. Trauma to the chest wall can lead to inadequate pulmonary ventilation. Example: A
patient with numerous rib fractures or a flail chest may purposely breathe shallowly in
an attempt to alleviate pain from the injury (Respiratory splinting) --> Can result in
decreased pulmonary ventilation
**Proper ventilatory support is crucial.
3. Hypoventilation & Hyperventilation-
a. Hypoventilation: occurs when CO2 production exceeds CO2 elimination.
b. Hyperventilation occurs when carbon dioxide elimination exceeds carbon dioxide
production.
--> Hypoventilation and hyperventilation could represent the body's attempt to
compensate for various abnormal conditions. For example, if the pH of the blood
alkalotic, the patient's breathing may become slow or shallow in an attempt to retain
CO2 to decrease the pH<--
4. Hypercarbia & Hypocarbia:
a. Decrease in minute volume decreases CO2 elimination --> Results in buildup of CO2
in the blood (hypercarbia)
b. Increase in minute volume increases CO2 elimination --> Lowers CO2 in the blood
(hypocarbia)
4. Factors affecting oxygenation and respiration
1. External factors:
a. External factors in ambient air. Examples: Atmospheric pressure, partial pressure of
oxygen --> At high altitudes, the percentage of oxygen remains the same, but partial
pressure decreases because total atmospheric pressure decreases. -- > Closed
environments may also have decreases in ambient oxygen. Examples: Mines and
trenches
b. Toxic gases displace oxygen in the environment. --> CO inhibits the proper transport
of oxygen to tissues
2. Internal factors:
a. Conditions that reduce the surface area for gas exchange also decrease the body's
oxygen supply.
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