1 Waiting to Exhale Respiratory Disorders Peggy Andrews, Instructor Fall, ‘08.
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Waiting to Exhale
Respiratory Disorders
Peggy Andrews, Instructor
Fall, ‘08
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A quick review
• Upper airway– To larynx– Warms,
humidifies, cleans– Cilia– Turbinates– Cribiform plate
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Review, continued
• Lower airway– Below larynx– Trachea– Bronchi– Alveoli– Surfactant
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Lower airway, cont.
• Lungs– Lobes– Visceral pleura– Parietal pleura
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Review, continued
• Ventilation– Inspiration– Expiration
• Respiration-Tidal Volume– 500ml
• Inspiratory Reserve Volume– 3000ml
• Expiratory reserve volume– 1500ml
• Residual volume– 1200ml
• Dead air space– 150ml
• Minute volume– TV x RR
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What controls our breathing?
• Medulla– 12-20/min
• Transmitted through – phrenic nerves
• 3rd, 4th, 5th spinal nerves
– and intercostal nerves• 11 pair
• Can be modified by – Cerebral cortex– Hypothalamus– Brainstem (pons)
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What controls our breathing, cont.
• Stretch receptors– Visceral pleura– Bronchi and bronchiole walls
Hering-Breuer reflex
Phrenic and intercostalnerves
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More stuff
• PCO2 increase = increased PCO2 in CSF = decreased pH
Respiratory patternsCheyne-StokesKussmaul’sCentral neurogenic hyperventilationAtaxic (Biot’s) Apneustic
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Cheyne-stokes
Central neuro-genic hypervent.
Apneustic
Ataxic (Biot’s)
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Respiratory Disorders
• Incidence - 28% of all EMS C/C
• Morbidity/Mortality - >200,000
deaths/yr.
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Risk Factors
• Stress
– Increases
severity of
respiratory
complaints &
frequency of
exacerbations
Genetic predispositionAsthmaCOPDCarcinomas
Assoc.
Cardiac
or circ
ulatory
pathologies
Pulmonary
edem
a
Pulmonary
emboli
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Case Presentation One
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Entering the bathroom, the EMTs find:
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The Patient Is:
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• 1. What is her differential diagnosis?
• 2. What treatment might you provide
for this patient? Why?
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Signs of life-threatening respiratory distress in adults
• Altered mental status
• Severe cyanosis
• Absent breath sounds
• Audible stridor
• 1-2 word dyspnea• Tachycardia >
130/min.• Pallor and
diaphoresis• Retractions/
accessory muscle use
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COPD
• Outflow obstructive diseases
– Emphysema
– Chronic Bronchitis
– Asthma
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The COPD patient
• May have any or all three diseases• Works harder to breath – tires
quickly• Be prepared to take over breathing
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Case Presentation Two
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You note the following:
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• What is his differential diagnosis?
• What treatment might you provide
him?
• Why?
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Emphysema
• Irreversible airway obstruction
• Diffusion defect also exists because
of blebs - prone to collapse - pt.
exhales with pursed lips
• Almost always associated with
cigarette smoking or environmental
toxins
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Xray of pt
With Emphysema
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Pathophysiology
• Stiffening and enlargement of alveoli – requires higher lung pressures
• More common in men• Walls of alveoli gradually destruct, =
alveolar membrane surface area. Results in ratio of air to lung tissue.
• Pulmonary capillaries , = resistance to pulmonary blood flow.
• Causes pulmonary hypertension, leads to RHF, then Cor Pulmonale
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Pathophys. (Cont.)
• Bronchiole walls weaken, lungs lose elasticity, air is trapped. Residual volume, but vital capacity relatively normal.
• PaO2 , = RBC, polycythemia.• PaCO2 , is chronically elevated. The
body depends on hypoxic drive.• Pt’s are more susceptible to pneumonia,
dysrhythmias.• Meds; bronchodilators, corticosteroids,
O2.
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Assessment• Altered mentation• 1-2 word dyspnea• Absent or decreased breath
sounds• c/c Dyspnea, morning cough,
nocturnal dyspnea, wheezing
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• History - – Personal or family hx of
allergies/asthma– Acute exposure to pulmonary
irritant– Previous similar expisodes– Recent wt. loss, exertional
dyspnea– Usually > 20 pack/year/history
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Exam
• Wheezing• Retractions
and/or accessory muscle use
• Barrel chest• Prolonged
expiratory phase• Rapid resting
respiratory rate
• Thin• Pink puffers• Clubbing of
fingers• Diminished breath
sounds• JVD, hepatic
congestion, peripheral edema
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Management
• Pulse oximeter• Intubation prn• Assisted ventilation prn• High flow oxygen• IV therapy with fluids• Albuterol, or Albuterol/Atrovent
neb• Transport considerations
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Chronic Bronchitis
• Productive cough for at least 3 months for two or more consecutive years
• An increase in mucous-secreting cells• Characterized by large quantity of
sputum• Chronic smoker• Alveoli not severely affected - diffusion nl. gas exchange = hypoxia & hypercarbia• May increase RBC = polycythemia paCO2 = irritability, h/a, personality
changes, intellect. paCO2 = pulmonary hypertension &
eventually cor pulmonale.
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Xray of pt
With Chronic
Bronchitis
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Assessment• Hx heavy cigarette smoking• Frequent resp. infections• Productive cough• Overweight, possibly cyanotic -
blue bloaters• Rhonchi on auscultation -
mucous plugs• S/S RHF; JVD, edema, hepatic
congestion
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Management
•Pulse oximetry•Oxygen - low flow if possible•Nebulized Albuterol/Atrovent •Constantly monitor•Position - seated•IV TKO
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Case Presentation Three
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You find the following:
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• What is your differential diagnosis?
• What treatment would you offer this patient and why?
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Asthma
• Reversible obstruction caused by combination of smooth muscle spasm, mucous, edema
• Exacerbating factors - extrinsic in children, intrinsic in adults
• Status asthmaticus - prolonged exacerbation - doesn’t respond to therapy
• Significant increase in deaths in last decade- 45 years or older - black 2x higher
• 50% are prehospital deaths.
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Pathophysiology• A chronic inflammatory airway
disorder.• Triggers vary - allergens, cold air,
exercise, food, irritants, medications.
• A two-phase reaction
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• Phase one– Histamine release - bronchial
constriction, leakage of fluid from peribronchial capillaries = bronchoconstriction, bronchial edema.
– Often resolves in 1 - 2 hours
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Pathophysiology (cont.)
• Phase two– 6-8 hours after exposure, inflammation
of bronchioles - eosinophils, neutrophils, lymphocytes invade respiratory mucosa; = additional edema, swelling.
– Doesn’t typically respond to inhalers; often requires corticosteriods.
• Inflammation usually begins days/weeks before attack.
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Assessment• Dyspnea, 1-2
word dyspnea• Persistent, non-
productive cough• Wheezing• Hyperinflation of
chest• Tachypnea,
accessory muscle use
• Pulsus paradoxis– 10-15 mm bp drop
during insp vs exp
• Agitated, anxious• Decreased
oxygen saturation• Tachycardia• Hx of allergies• Auto PEEP• Potential tensions
(bilateral)
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Management
• Check home meds• Determine onset of sx & what pt. has
taken• Check vitals carefully - resp. x 30 sec.• High flow oxygen• IV with fluids• ECG• Inhalers• Consider epinephrine 1:1,000 SQ, 0.3-0.5
mg • Consider Solu-Medrol, 1 –2 mg/kg IVP,
max 125 mg
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Status Asthmaticus
• Severe, prolonged asthma attack not responsive to tx.
• Greatly distended chest• Absent breath sounds• Pt. exhausted, dehydrated, acidotic.• Treat aggressively if obtunded,
profuse diaphoresis, floppy – Intubate (poss. RSI)
• Transport immediately
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Xray of a pt
With Asthma
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Case Presentation Four
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Your exam reveals the following:
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• What is his differential diagnosis?
• What treatment would you offer
this patient? Why?
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Pneumonia• 5th leading cause of death in US• Risk factors
– Cigarette smoking– Alcoholism– Cold exposure– Extremes of age
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• Pathophysiology– A common respiratory disease
caused by infectious agent. bacterial and viral pneumonia most frequent.
– May cause atelectasis– May become systemic = sepsis
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Assessment• Typical
– Acute onset of fever and chills– Cough productive with yellow/green
sputum (bad breath!)– May have pleuritic chest pain– Pulmonary consolidation on
auscultation– Rales – Egophony (strange lung sounds)
• Atypical– Non-productive cough– H/A– Fatigue
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Management
• Position• Oxygen• Consider breathing tx.• IV with fluids• Cool if febrile• Elderly, over 65 years
– Significant co-morbidity– Inability to take meds– Support complications
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Xray of a pt
With
pneumonia
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Case Presentation Five
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On physical exam:
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• What is your differential diagnosis?
• What treatment would you offer
this patient? Why?
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Hyperventilation Syndrome
• Multiple causes– Hypoxia– High altitude– Pulmonary disease– Pneumonia– Interstitial pneumonitis, fibrosis,
edema– Pulmonary emboli– Bronchial asthma– Congestive heart failure– Hypotension– Metabolic disorder– Acidosis
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Hyperventilation Syndrome (cont)• Causes, cont.
– Hepatic failure– Neurologic disorders– Psychogenic or anxiety hypertension– Central nervous system infection,
tumors– Drug-induced– Salicylate– Methylxanthine derivatives– Beta-adrenergic agonists– Progesterone– Fever,sepsis– Pain– Pregnancy
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Assessment
• Chief complaint– Dyspnea– Chest pain– Other sx based on etiology– Carpopedal spasm– Tachypnea with high minute volume
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Management
• Depends on cause of syndrome
• Oxygen based on sx and pulse oximetry
• Consider coached ventilation
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Upper Respiratory Infection (URI)
• One of most common c/c• Usually viral• Bacterial infections
– Group A streptococcus• Strep throat• Sinusitis• Middle ear infections
• Most URI’s self-limiting
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URI continued
• S/S– Fever– Chills– Myalgias– Fatigue
• Tx– Supportive– Acetaminophen, ibuprofen, liquids
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URI, cont.
• If pediatric, beware of possibility of epiglotitis
• If PMH; Asthma or COPD, condition may worsen– Consider nebulized meds
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Lung CA
• Most caused by cigarette smoking• 4 major types
– Adenocarcinoma – most common• Origin; mucus-producing cells
– Small cell carcinoma– Epidermoid carcinoma– Large cell carcinoma
• Origin; bronchial tissues
• Most patients die w/in one year
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Lung CA, continued
• General Assessment;– Altered mentation– 1-2 word
sentences– Cyanosis– Hemoptysis– Hypoxia
• Advanced disease– Profound weight
loss– Cachexia– Malnutrition– Crackles, rhonchi,
wheezes– Diminished breath
sounds– Venous distention
in arms and neck
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• Localized disease– Cough, dyspnea, hoarseness, vague
chest pain, hemoptysis
• Local invasion– Pain on swallowing (dysphagia)– Weakness, numbness in arm– Shoulder pain
• Metastatic spread– Headache, seizures, bone pain,
abdominal pain, nausea, malaise
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Tx for Lung CA
• Oxygen prn• Support ventilations• Intubate prn• IV• Nubulized meds• DNR / Advanced directive?
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Toxic inhalation
• Consider if pt dyspneic• Causes
– Superheated air– Products of combustion– Chemical irritants– Steam inhalation
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Inhalation injury, cont.
• Medic safety– Ammonia (ammonium hydroxide)– Nitrogen oxide (nitric acid)– Sulfer dioxide (sulfurous acid)– Sulfur trioxide (sulfuric acid)– Chlorine (hydrochloric acid)
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• Assessment– Enclosed space?– Loss of consciousness?– Mouth, face, throat, nares– Auscultate chest– Laryngeal edema
• Hoarseness, brassy cough, stridor
• Management– Maintain airway– High-flow humidified oxygen– IV
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Carbon Monoxide inhalation
• Incomplete burning of fossel fuels, other carbon-containing compounds
• Automobile exhaust, home-heating devices most common causes
• CO has >200x affinity for hemoglobin– Cellular hypoxia
• Also binds to iron-containing enzymes– Increased cellular acidosis
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CO, continued
• Assessment– Source, length of exposure? Closed vs
open space?• S/S
– H/A, N/V, confusion, agitation, loss of coordination, chest pain, loss of consciousness, seizures
– Cyanosis– Cherry red (very late)
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CO, continued
• Management– SAFETY– Maintain airway– High flow oxygen (NRB vs assist– Hyperbaric oxygen therapy
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Pulmonary Embolus
• Thrombus• Ventilation perfusion mismatch• 50,000 deaths in US annually • Conditions that predispose to PE
– Recent surgery– Long-bone fracture– Bedridden– Long flights/truck drivers– Pregnancy– Cancer, infections, thrombophlebitis, Af,
sickle cell anemia– BCP
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PE, cont
• Assessment– Sudden onset SOB, Hypoxic– Pleuritic chest pain– Non-productive cough– History– Labored breathing, tachypnea,
tachycardia– RHF– DVT present
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PE, cont
• Management• ABC• Airway • High flow oxygen• ET?• IV – flow rate?• Heparin gtt? TPA?
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CT o
f Pul
mon
ary
Embo
lus
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Spontaneous pneumothorax
• Common- high recurrent rate– 5:1 male to female– Tall, thin– Smoking history– 20-40 years old– COPD = increased risk
• Ventilation perfusion mismatch if > 20%
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Spont. Pneumothorax, cont.
• Assessment– Sudden onset sharp chest or shoulder
pain– Coughing/lifting– Dyspnea– Decreased breath sounds at apex– Hyper resonance – Sub-cutaneous emphysema– Tachypnea, diaphoresis, pallor
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Spont. Pneumothorax, cont.
• Management– Supplemental oxygen – If sx increase, consider needle
decompression– Position of comfort
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Xray of
Spontaneous
Pneumothorax
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107Xray of pt with R-sided tension pneumothorax
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That’s all about breathingfor now, folks!
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