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Julie Shared "Gas Exchange Ch 25 Wk 5" - 16 Picmonics

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Gas Exchange Ch 25 Wk 5

Respiratory Anatomy
Characteristics
Nasal Cavity
Hair Filters
Mucus Filters and Moistens
Capillaries Warm
Pharynx (Throat)
Larynx (Voice Box)
Cilia Expel Mucus and Dust
Trachea
Bronchi
Alveoli
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2 mins
Alveolar Gas Exchange
Characteristics
Pulmonary Artery Blood is O2-Poor, CO2-Rich
Two-Cell Thick Air-Blood Barrier
CO2 Diffuses Into Air
O2 Diffuses Into Blood
Gases Equilibrate
Pulmonary Vein is O2-Rich, CO2-Poor
Thermoregulation
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2 mins
Oxygen Delivery Methods
Nasal Cannula
Simple Face Mask
Non-Rebreather Mask
Venturi-Mask
Safety Precautions
Oxygen In Use Sign
No Electrical Sparks
Six Feet Away from Open Flames
Nursing Considerations
Dry Nasal and Upper Airway Mucosa
Skin Irritation
Home Education
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1 min
Physiologic Dead Space (VD)
Tidal Volume (Vt)
Partial Pressure of Arterial CO2 (PaCO2)
Partial Pressure of CO2 in Expired Air (PECO2)
VD = VT x (PaCO2-PECO2) / PaCO2
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2 mins
A-a Gradient
Partial pressure of alveolar oxygen (PAO2)
Partial Pressure of Arterial O2 (PaO2)
Normal 10 to 15 mmHg
Hypoxemia with an Abnormal A-a Gradient
Diffusion problem
Shunting (Low V/Q)
Dead space (high V/Q)
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1 min
Alveolar Gas Equation
Equation
Partial Pressure of Alveolar Oxygen (PAO2)
Partial Pressure of Oxygen in the Inspired Air (PIO2)
PIO2 Normally Approximated = 150 mmHg
Arterial Partial Pressure of CO2 (PaCO2)
Respiratory Quotient (R)
R Normally Approximated = 0.8
PAO2 = PIO2 - (PaCO2/R)
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1 min
Winter's Formula
Evaluates Respiratory Compensation
Used in Metabolic Acidosis
Equation
(HCO3 x 1.5 ) + 8 plus-minus 2 = PCO2
Steps
Bicarbonate (HCO3) x 1.5
+ 8
± 2
= Expected Value for PCO2
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2 mins
Light's Criteria
Use
Determines Transudative vs. Exudative Source of Pleural Effusion
Exudate if (At Least One of the Following):
Effusion/Serum Protein Ratio > 0.5
Effusion/Serum LDH Ratio > 0.6
Effusion LDH > Two-thirds Upper Serum LDH Range
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2 mins
Heart Failure Interventions
Diagnostic Tests
Echocardiogram
Invasive Hemodynamic Monitoring
Improve Gas Exchange
High Fowler's Position
Oxygen
Advanced Airway
Drugs and Devices
Diuretics
Beta Blockers
Angiotensin II Receptor Blockers (ARBs)
ACE Inhibitors
Digoxin (Lanoxin)
Pacemaker
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2 mins
Respiratory Acidosis Assessment
Assessment
Decreased pH < 7.35
Increased PaCO2 > 45
Reduced Respirations
Anxiety
Change in LOC
Tachycardia
Cyanosis
Increased Electrolytes
ECG Changes
Muscle Weakness
Hyporeflexia
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2 mins
Acute Respiratory Distress Syndrome (ARDS) Interventions
Interventions
Closely Monitor Patient
ABG's (Arterial Blood Gases)
Oxygen
Assess for O2 Toxicity
Mechanical Ventilation
PEEP
Assess for Pneumothorax
Permissive Hypercapnia
Considerations
High Mortality Rate
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2 mins
Acute Respiratory Distress Syndrome (ARDS) Assessment
Cause
Damaged Alveolar-Capillary Membrane
Assessment
Restlessness
Dyspnea
Refractory Hypoxemia
Decreased PaO2
Diffuse Pulmonary Infiltrates
Atelectasis
Pulmonary Hypertension
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2 mins
Pulmonary Embolism Assessment
Assessment
Shortness of Breath (SOB)
Pleuritic Chest Pain
Tachypnea
Hemoptysis
Hypoxemia
Considerations
Sudden Death
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52 secs
Respiratory Acidosis Interventions
Improve Respiration
Pharmacologic Interventions
Bronchodilators
Respiratory Stimulants
Drug Antagonists
Nonpharmacologic Interventions
Oxygen
Assisted Ventilation
Prevent Complications
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1 min
Hypoxia (Late Symptoms)
Cyanosis
Cool, Clammy Skin
Use of Accessory Muscles
Retractions
Hypotension
Arrhythmias
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2 mins
Hypoxia (Early Symptoms)
Diaphoresis
Restlessness
Tachypnea
Dyspnea on Exertion
Tachycardia
Hypertension
Arrhythmias
Decreased Urine Output
Unexplained Fatigue
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1 min

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