Week 2 - Respiratory Health 1 Flashcards
(37 cards)
Functions of the Respiratory System
1) Ventilation
- Inspiration - bring air into lungs
- Expiration - expelling air from lungs
2) Gas Exchange
- Gas exchange With pulmonary capillaries occurs in alveoli
3) Regulation of pH and bodily fluids
- CO2 in blood effects body pH
- Respiratory rate influence the elimination and/or accumulation of CO2 in the body impacting pH of body fluids
4) Sound Production
- Passage of air through vocal folds of larynx generates sounds with variations in pitch (frequency) and amplitude (volume)
5) Olfaction
What are the 3 components of a Respiratory Assessment?
1) History
2) Physical Assessment
3) Lab Data
What is Involved in a Health History?
- Biographical data
- Health status/medical history
- Environmental factors
- Lifestyle factors
- HPI-OLD CARTSS
○ HPI - history of present illness
What is Involved in a Physical Assessment?
1) Inspection
2) Palpation
3) Auscultation
- Type of breath sound: bronchial, bronchovesicular, vesicular
Inspection
LOC
- Colour-skin, nails
○ If assessing cyanosis or pallor on a dark-skinned individuals, look beneath tongue
- Respiratory rate (12-20)
○ Bradypnea - RR < 12; if low, get them to sit up; drops the diaphragm and allows better chest expansion
○ Usually due to problem with SNS - Respiratory rhythm (regular/irregular)
○ If breathing is irregular: count for a full minute to ensure more accuracy
○ If documenting apnea, document how long apenic periods last - Mouth breathing, pursed-lip breathing
Palpation
- Chest expansion
- Tenderness
○ If there is tenderness, it points to a musculoskeletal problem rather than a resp one - Tactile fremitus
○ Holds hands over thoracic cavity in different places and ask to repeat “99”
○ Chronic conditions with fibrous lugs will be flatter and have less vibration - Masses
- Crepitus - escaped air under skin, feels like rice crispies
5 Adventitious Breath Sounds?
1) Wheezes
2) Rhonchi
3) Fine crackles (Rales)
4) Stridor
5) Pleural Friction Rub
Wheezes
- high-pitched, usually on inspiration, due to narrowed/inflamed airways
Rhonchi
- low-pitched wheezes, continuous, bubbling, due to secretions from inflammation, in large airways (sounds like snoring)
Fine Crackles
- brief, usually at end of inspiration, popping/cracking sound, due to fluid in alveoli, coarse crackles longer, louder than fine crackles
Stridor
- loud, high-pitched sound on inspiration, due to upper airway narrowing
○ Life threatening
○ Emergency treatment required
Pleural friction rub
- low pitched grating/crackling due to inflammation of pleura
○ Accompanied with pain
Normal Hemoglobin Values
Males: 140-180 g/L
Females: 120-160 g/L
Normal Hemogtocrit Values
Males: 0.42-0.52
Females: 0.37-0.47
What is an Acid Base Balance
- balance between input and output of hydrogen ions
-Acid: substance that releases H ions
- Base: substance that accepts H+ ions
Normal pH
pH: measure of concentration of H+
Normal pH: 7.35-7.45
- if pH drops (increase in H+) = acidosis (pH<7.35)
- if pH rises (decrease in H+) = alkalosis (pH>7.45)
How do the lungs maintain acid balance
- lungs take in O2 and expel CO2
- CO2 is acidic
How Lungs Adjust Breathing
* If blood too acidic (low pH), breathing rate & depth increases to expel CO2
* If blood too basic (high pH), breathing rate slows to retain CO2
How do kidneys maintain acid balance?
HCO3- is a base that neutralize acids in blood
Kidneys can:
-reabsorb HCO3
- from the urine back into the blood to maintain pH
- excrete (H+): remove excess hydrogen ions (excrete
them into urine)
- produce HCO3
- Process takes longer but effects are longer lasting
How is Hyperkalemia caused by an acid base imbalance?
If acidosis occurs:
- High H+ ions outside the cell move into the cell to balance pH
- In response, K+ moves outside the cell to balance electric forces ↑ serum K+
- ACIDOSIS CAUSES HYPERKALEMIA
How is Hypokalemia caused by an acid base imbalance?
If alkalosis occurs:
- H+ ion inside the cell move outside the cell to balance pH
- In response, K+ moves inside the cell to balance electric forces ↓ serum K+
- ALKALOSIS CAUSES HYPOKALEMIA
Arterial Blood Gas Values
- pH - 7.35-7.45
- PaO2 - 80-100 mmHg
- PaCO2 - 35-45 mmHg
- HCO3 - 22-26 mEg/L
Respiratory Acidosis
- Caused by any condition that depresses ventilation (more CO2 stays in body=acidic) (ex. pneumonia, atelectasis, sedating meds, head injury)
- Hypoventilation, shallow resps, low RR
- Increased CO2, H+, H2CO3
- Decreased pH
- Compensatory response to HCO3 - retention by kidneys
Respiratory Alkalosis
- Caused by excessive exhalation of CO2 (hyperventilation)- sepsis, anxiety, pain, fever, pulmonary embolism
- Hyperventilation, Increased RR
- Decreased CO2, H+
- Increased pH
- Compensatory response of HCO3− excretion by kidneys
Metabolic Acidosis
- Caused by increase in acid or decrease in HCO3
- due to starvation,
renal failure, dehydration, diarrhea, DKA, medications - pH decreases
- Compensatory response of CO2: excretion by lungs