Respiratory Problems Flashcards
(95 cards)
FUNCTIONS OF THE RESPIRATORY TRACT
- RESPIRATION
- ACID BASE
FUNCTIONS OF THE RESPIRATORY TRACT: Respiration_Breathing Sequence
- Phrenic nerve stimulation
- diaphragm and muscles contract; thorax expands
- Intrathoracic and intrapulmonic pressures decrease
- INSPIRATION : air moves from (+) pressure outside to (-) pressure in alveoli; stretch receptors are stimulated
- EXPIRATION : passive expulsion of air as elastic tissue recoils
Hering-Breuer reflex
inspiration stimulates alveolar stretch receptors, which send inhibitory impulses to brainstem to prevent overdistention
Chemoreceptors (central & peripheral)
stimulate respiration in
response to lowered pH, increased PCO2 and decreased PO2
Medulla oblongata and pons
control respiration rate and depth
Compliance
capacity of chest wall and lung to distend
Resistance
mostly dependent on airway size, as well as tissue resistance
Respiratory Tract in Infants and Children
- Neonate: rapid RR (high metabolism); rate
steadily decreases with growth and maturity - During growth: amount of oxygen in expired air
decreases, replaced by more carbon dioxide - Newborn and Infant: higher compliance due to flexible rib cage; with growth, compliance
decreases
pH
hydrogen ion concentration in solution; measure of
acidity and alkalosis
Steady pH concentration in the body
homeostasis; balance between acidosis and alkalosis
Respiration’s role
pH drops, respirations increase to exhale more carbon dioxide; when pH rises, respiratory center decreases rate of respiration
Alterations in exhalation of carbon dioxide (CO2) alter normal concentrations of carbonic acid (H2CO3) in the body results to….
respiratory acidosis or alkalosis
Acidosis
excess presence of H+ ions
Alkalosis
deficiency of H+ ions
Acid Base Balance in Infants and Children
- In many disorders, symptoms like fever, vomiting or diarrhea, cause acid-base disturbances that are
more hazardous to a child than the primary
disorder - Hydration, electrolyte replacements, etc. can often stabilize these disorders
ASSESSMENT AND
GENERAL PHYSICAL
EXAMINATION: Physical Observations
- Chest rise-and-fall (child 7 and up)
- Abdominal rise-and-fall (infant and young child)
- Nasal Flaring : indicates respiratory distress
- Skin : mottled, pallor, cyanosis
- Clubbing at fingertips, usually with chronic hypoxia
ASSESSMENT AND
GENERAL PHYSICAL
EXAMINATION: Counting Respirations
Counting Respirations
- Abdominal movements in infant to age 7
- Chest movements in age 7 and up
- Count when child is restful and unaware
- Tachypnea: rapid respiration often due to awareness, excitement, anxiety, fever, other disorders
Hyperpnea
excessively deep breathing; seen in fever,
anemia, etc.
Hypopnea
shallow breathing
Dyspnea
difficulty breathing
Hypoventilation
too-shallow, too-slow breathing that fails to
meet the body’s needs. Seen in preterm infants and children with neuromuscular disorders
ASSESSMENT AND
GENERAL PHYSICAL
EXAMINATION: Auscultation
- Airway patency
- Wheezing: musical breathing, usually on
expiration from narrowed airway or foreign body obstruction - Stridor: loud, high-pitched breathing;
inspiratory or expiratory; usually from narrowed upper airway or foreign body obstruction - Cough: voluntary or involuntary reflex
- Whoop: inspiratory sound with cough
associated with pertussis in small children
ASSESSMENT AND
GENERAL PHYSICAL
EXAMINATION: Palpation/ Percussion
- Chest and back palpation for movement
- Fremitus: voice sounds while breathing
- Percussion: can be used to loosen secretions
DIAGNOSTIC TESTS: Chest Radiograph
- Use of x-rays passed through the body to record internal structures
- Protect gonads and thyroid with lead shield