Exam 2 (W5&6 Respiratory) Flashcards
Prolonged obstruction of nasal passage (NG tube or intubation is linked to what
sinusitis
Why is Endotracheal intubation also at risk for nosocomial sinus
because of pooling of nasopharyngeal secretions
Why are patients with artificial airway at high risk for infection
no cilia - cant catch cilia
What is the most common sign of meningitis
sinusitis
What are s/s meningitis
s/s photophobia, seizers, stiff neck (nucalrigidity), fever
neuroanatomy related to respiration is controlled by what
medulla and pons
What do Central chemoreceptors in the medulla do?
respond to change in PCo2 and ph levels in csf –> alter rate and depth of respirations
What do peripheral chemoreceptors do in relation to the respiratory system?
respond first to po2 (less than 60), then will respond to ph and pco2 by altering rate and depth
Describe what happens to the central chemoreceptors in patients with COPD
No longer respond to CO2 or pH in patients with COPD
elevated CO2 does not get a response; these people rely on peripheral chemoreceptors
Hering-breuer reflex
prevents overinflation of the lungs
Why do we not want to give patients with COPD too much o2?
their O2 will get too high ; if we give them too much they will stop breathing
What are the components of external respiration?
Ventilation (act of breathing)
Perfusion (blood flow to alveoli)
Diffusion (Movement of gases from high concentration to low concentration)
– between environment and lungs
Describe internal respiration
Oxygen is supplied to and co2 is removed from body cells by way of circulation
- between blood and cell
Describe the flow of air from the environment into the lungs
trachea, bronchi, bronchioles, alveoli
Airway resistance of determined by what?
The size of the airway through which the air is flowing
Bronchospasm
Airway resistance in which there is contraction of bronchial smooth muscle
Obstruction of airway
Airway resistance in which a foreign object is in airway preventing adequate CO2
What diseased is related to thickening of bronchial mucosa?
COPD, asthma
Compliance
ability of lungs to return to normal - expandability and elasticity
What contributes to compliance of the lungs?
a. Surfactant (surface tension)
b. CT
What happens to the lungs with increased compliance?
causes lungs to not return to normal elasticity (emphysema)
What happens to the lungs and with decreased compliance?
They are stiff ARDS, pneumothorax, pulmonary edema, pleural effusion
What is the tidal volume normal range?
500mL (5-10mL/kg)
What is vital capacity and what is its range?
the amount of air you can move out
4800mL (20-40mL/kg)
What needs to happen with vital capacity less than 20mL/kg?
patient needs ventilatory assistance
What is pulmonary perfusion?
Blood flow through the pulmonary circulation
– 2% of blood flow pumped by the rv does not perfuse the alveolar capillaries (doesn’t enter pulmonary circulation)
What is pulmonary artery pressure value?
20-30mmHg
Describe effects of gravity on pulmonary circulation?
Lower areas receive more blood flow than upper areas
Describe the functions of RV and LA
Right ventricle into pulmonary circulation, picks up o2, left atrium to be projected out into body by
Ventilation vs perfusion and their ratios
Ventilation is flow of gas in and out of lungs (normal 4 L/min)
Perfusion is filling of the pulmonary capillaries with blood (normal 5 L/min)
Perfusion ratio is 4:5 or 0.8
What is shunting?
Shunting (low v/q ratio)
Normal shunting is 2%
Secondary to airway obstruction
Blood is bypassing the alveoli without gas exchange
Severe hypoxia occurs when shunting is 20%
Dead space
(high v/q ratio)
Adequate ventilation but impaired perfusion
Pulmonary embolus
What is silent unit?
unit (absence of v/q)
Little to no ventilation and perfusion (ARDS)
Describe ventilation and perfusion with pulmonary embolism
clot siting in artery – ventilation is fine but the clot is blocking gas exchange (increase in shunts); RV not getting blood into pulmonary circulation
– hypoxic, cyanotic, dusky
Describe what happens when O2 saturation is below 70%.
vessels constrict
Start shunting O2 where it needs to be (heart, lungs, brain, kidneys)
Increased vascular resistance and pulmonary vasoconstriction
Increased pressure on right ventricle (Cor pulmonale)
Systemic vessels dilate
What is cor pulmonale
Right sided heart failure
Enlargement of the right ventricle due to high blood pressure in the lungs usually caused by chronic lung disease
What happens in the RV with COPD?
RV has to work against the pulmonary pressure; the pulmonary pressure increases the workload and the patient goes into heart failure (cor pulmonale)
How much blood is deoxygenated before we see change in skin color?
1/3
What are the gas % at room air?
78% nitrogen
21% oxygen
traces of CO2, water vapor, helium, argon
Describe what blood does in the body
Transported dissolved in blood in two forms
- Dissolved in plasma
- Combines with the hemoglobin of RBC
- 100 ml of arterial blood carries 0.3 ml of oxygen dissolved and 20 ml combined with the hemoglobin
Hemaglobin
Hemoglobin rapidly releases oxygen into the tissues to satisfy metabolic needs
What happens when hemoglobin is present as methemoglobin
not carrying o2 –> hypoxic and cyanotic
drug reaction from local anesth.
What happens to hemoglobin when carbon monoxide is present
Causes hemoglobin to not combine with the oxygen
Resulting in tissue hypoxia and LACTIC ACIDOSIS
Gerontologic considerations for respiratory system: defense mechanisms
decreased cough reflex (increased infection risk); decreased pulmonary reserve, at risk for respiratory acidosis d/t hypoventilation
Gerontologic considerations for respiratory system: lung
Smaller alveolar space - impacts gas exhange
Gerontologic considerations for respiratory system: chest and wall muscle weakness
intercostal muscles are smaller which inhibits them from taking BIG deep breaths
Gerontologic considerations for respiratory system: skeletal changes
Kyphosis, scoliosis, lordosis –> Impact ability to take big deep breath
Respiratory assessment: dyspnea
difficult or labored breathing - SOB
Respiratory assessment: cough
Everyone w lung disease will have a cough –> ask if the cough is different than normal
Pneumonia or other rr conditions – don’t panic with little specks of blood – clots of blood = issue
Respiratory assessment: Sputum production
Color? Same or different color?
Yellow = indication of acute infection (on top of normal pathogens that they have in their sputum)
Respiratory assessment: hemoptysis
Blood in sputum
Respiratory assessment: chest pain
Accompanies cardiac events
Could be indicator of emboli
How do we know if chest pain is cardiac or pulmonary? Does this chest pain get worse when you breath (pulm. Issues gets worse with breathing)
Respiratory assessment: wheezing
Wheezing in someone with asthma = good
Stridor = never good (call provider)
Silent chest / no wheezing during acute asthma attack = not breathing
Respiratory physical assessment - color
Cyanosis = late indicator of hypoxia (not a reliable indicator of hypoxia)
polycythemia may always appear cyanotic
Where should you assess for physical assessment of skin for respiratory conditions of dark skinned individuals?
buccal mucosa and hard palate
What are early indicators of hypoxia?
tachycardia, agitation, confusion
What should you do if someones heart rate is greater than 100 (tachycardia)?
put oxygen on them
What can cause the trachea to NOT be midline?
Pressure in chest (air, blood) pushing trachea to be deviated = bad –> 3am phone call because patient cant breath long w this
Hard to put endotracheal tube w deviated trachea (almost impossible to intubate)
Neck surgery at risk for bleeding and can push trachea (thyroid, cervical fusion, carotid artery cleaning)
Physical assessment of lower respiratory structures and breathing - how do we asses?
Thoracic inspection
Thoracic palpation
Thoracic percussion
(correct order)
Describe the inspection of the lower respiratory structures and breathing
symmetrical rise and fall of chest wall
side vs front –> ppl w normal pulmonary status will have double width to length of chest;
Course vs fine crackles
Depend on the amount of water in the lungs
What does pleural friction rub sound like and when would you hear it
Leather
- Hear it with pleural effusion and pleurisy
What might we hear when someone has pneumonia?
fine crackles because bacterial are liquidy, wet when they dry up you hear course
Describe basilar crackles
Edema in bases of the lungs - insignificant
What should we be concerned about crackles?
When we hear them taking up 1/3 - 2/3 of the lungs
What medications might we administer with edema, stridor and wheezes?
Edema - diuetics
Stridor - albuterol, IV corticosteroids
wheezes - albuterol
Common assessment findings we here for…
a. consolidation (pneumonia)
b. emphysema
c. asthma
d. pulmonary edema
e. pleural effusion
f. pneumothorax
g. atelectasis
a. Consolidation (pneumonia): crackles
b. Bronchitis: wheezes decreased
c. Emphysema: decreased with prolonged expirations
d. Asthma: wheezes
e. Pulmonary edema: crackles at bases, possible wheezes
f. Pleural effusion: decreased to absent breath sounds
g. Pneumothorax: absent or diminished
h. Atelectasis: decreased to absent, fine crackles (cough and deep breath)
Diagnostic evaluation: PFT
PFT: pulmonary function test
- never done in emergency
- lot of deep breathing, prolonged
- inhalation/exhalation and measuring that volume
- done if c/o SOB –> inhaler and then do PTF to see how it is working
can be done Q6 months or annually w ppl who have chronic lunch disease to monitor how well disease is being controlled
What are some considerations for PFT tests?
don’t have to be NPO in preparation, no consent needed, don’t eat too much before, need to know if provider wants the test done w or w/o inhaler,
Chest xray
radiation to take pic
CT
computerized tomography - can use contrast dye with consent from patient
MRI
can not have metal
with or without contrast