Pulmonology Flashcards
Mild hypoxia SpO2 levels and who this is most common in
91-94%
Elderly, obese, smokers
Biggest contraindication for CT with contrast
Chronic or acutely worsening renal disease
What is the “5th vital sign”?
Arterial oxygenation measured by pulse oximeter
Is a total lung capacity <80% suggestive of obstructive or restrictive lung disease?
Restrictive
Three most common causes of cough
Infectious agents
Sinus drainage
Acid reflux
Diagnostic labs (3) used in patients with dyspnea
BNP
D-dimer
ABGs
Preferred imaging method for evaluating incidental pulmonary nodules
CT scan WITHOUT contrast
Is an FEV1/FVC ratio <70% suggestive of obstructive or restrictive lung disease?
Obstructive
Follow-up is not required for lung nodules of this size in patients 35 or older without symptoms or risk factors of lung cancer
<6mm
Which cause of dyspnea is of mixed origin (cardiac and pulmonary)
Pulmonary emboli
Normal ranges on ABGs for:
1.) pH
2.) PaO2
3.) PaCO2
4.) HCO3
1.) pH - 7.35 to 7.45
2.) PaO2 - 80 to 100 mmHg
3.) PaCO2 - 35 to 45 mmHg
4.) HCO3 - 22 to 26 mmHg
Spirometry improvement with bronchodilator administration is more common in COPD or asthma?
Asthma
When CT with contrast is contraindicated, what can be used to assess likelihood of PE?
V/Q scan (nuclear)
pH - 7.12
PaO2 - 95
PaCO2 - 44
PaHCO3 - 12
Diagnose me!
Metabolic acidosis, uncompensated
Name the three corners of Virchow’s Triad
Vascular injury
Circulatory stasis
Hypercoagulable state
Gold standard for evaluating a PE
CTPA
pH - 7.38
PaO2 - 86
PaCO2 - 46
PaHCO3 - 32
Diagnose me!
Metabolic alkalosis, fully compensated
S1Q3T3 EKG changes are suggestive of …
Pulmonary embolism
Breathing faster will increase or decrease PaCO2?
Decrease
A normal shaped, small-sized flow-loop pattern is suggestive of …
Restrictive lung disease
True or false. A negative d-dimer is sufficient to rule out DVT/PE
True
What might you see in a chest x-ray of a patient with acute heart failure?
Cardiomegaly
Cephalization (stag)
Interstitial edema
Vascular congestion
Pleural effusions
Three indications for chest CT angiography
PE
Aortic aneurysm
Aortic dissection
Common reasons (3) for anion gap to be elevated
Lactic acidosis
Renal failure
Ketoacidosis
Two major types of CT with contrast
Helical and Axial
Diagnostic tests (7) used in patients with dyspnea
EKG
Pulse oximetry
CXR
Ultrasound
V/Q scan
CT scan
PFTs
Normal SpO2 levels
95-100%
This diagnostic lab test checks the function of a patient’s lungs and how well they are able to move oxygen in to and CO2 out of the blood
ABGs
CBC findings with pulmonary hypertension
Polycythemia (chronic hypoxia)
Most common cause of hemoptysis
Infection (60-70%)
(consider lung cancer though if patient is a big smoker)
ARDS would look like this on chest x-ray
Diffusely filled patchy infiltrates
Exudative effusions can be evaluated and empyema loculations can be broken up using this pulmonary procedure
Thorascopy
DLCO threshold for lung pathology
<80% = pathology
(>80% = normal)
If a patient with tuberculosis symptoms has a positive IGRA test, how should you proceed?
Isolate patient
Obtain chest x-ray
Three sputum samples (NAAT on at least one but Acid-fast bacilli is gold standard)
Still high suspicion but negative AFB = bronchoscopy with biopsies
This diagnostic lab is useful in patients with acute decompensated heart failure
BNP
Direct visualization of the larynx, trachea, and bronchi is done with this pulmonary procedure
Bronchoscopy
Most common sleep-related breathing disorder
Sleep apnea
The anion gap is most helpful in identifying the cause of …
Metabolic acidosis
DLCO measure the lungs capability to …
Perform gas exchange
PFT contraindications (6)
Anything that means they’re not currently at respiratory baseline
Exacerbation of acute severe asthma
Respiratory distress
Angina aggravated by testing
Pneumothorax
Ongoing hemoptysis
Active TB
This type of lung condition is characterized by airflow limitation
Obstructive
Gold standard for pneumonia diagnosis
Chest x-ray
Order we evaluate arterial blood gases
1.) Look at pH
2.) Look at CO2
3.) Look for compensation
How is the anion gap calculated?
Cations (Na + K) minus Anions (Chloride + Bicarb)
pH - 7.52
PaO2 - 88
PaCO2 - 45
PaHCO3 - 33
Diagnose me!
Metabolic alkalosis, uncompensated
pH - 7.29
PaO2 - 82
PaCO2 - 62
PaHCO3 - 26
Diagnose me!
Respiratory acidosis, uncompensated
This diagnostic lab is used in cases of dyspnea to detect markers of coagulation and fibrinolysis
D-dimer
This score is used to assess chance of morbidity/mortality if patient has community acquired pneumonia
PSI/PORT score
In a suspected pulmonary neoplasm, the first thing you should look for is …
Old films (old x-rays to compare to)
For solid lung nodules, growth is defined as …
Increase in size of >2mm
The two PE risk calculators
Well’s criteria
Perc rule
Indications for PFTs
Diagnosing and monitoring disease course and response to therapy
Two main types of pulmonary diseases
Obstructive
Restrictive
A scooped out, small flow-loop pattern is suggestive of …
Mixed obstructive and restrictive lung disease
Severe hypoxemia SpO2 levels
<85%
Things measured during polysomnography testing
Apnea hypopnea index (AHI)
- number of apneas per hour
Sometimes Respiratory Disturbance Index is used (more sensitive, includes hypopneas and apneas)
Oxygen desaturation
A scooped out, normal sized flow-loop pattern is suggestive of …
Obstructive lung disease
True or false. Pneumothorax is best visualized on chest x-ray in the expiratory view
True
pH - 7.29
PaO2 - 90
PaCO2 - 20
PaHCO3 - 16
Diagnose me!
Metabolic acidosis, partially compensated
pH - 7.35
PaO2 - 90
PaCO2 - 48
PaHCO3 - 37
Diagnose me!
Respiratory acidosis, fully compensated
(taken from slide 30 first example)
Bicarb is more out of range, so I think it should be fully comp met. alkalosis
Most important part of a patient encounter when trying to diagnose a patient with dyspnea
Patient history!
Calcifications are best viewed with this type of CT scan
CT without contrast
Reasons (8) for D-dimer to be elevated
DVT
PE
Pregnancy
Malignancy
Surgery
Infection
Inflammation
Smoking
(she did say “just know lots of things elevate”)
Describe initial diagnosis method for TB
1.) Consider TB skin test
2.) TB blood tests/IGRAs (T-SPOT or QuantiFERON)
Consider IGRAs first if patient had bacille Calmette-Guerin (BCG) vaccine OR people who can’t come back for skin test follow-up
Diagnostic therapy used in patients with dyspnea
Oxygen
Pulmonary embolism is present in this percentage of patients with DVT
60-80%
Diagnostic procedures (2)
Bronchoscopy
Thorascopy (VATS)
In patients 35 or older without symptoms or risk factors of lung cancer, at what size should a lung nodule be followed up on?
> 8mm
Biggest indication for DLCO testing
Restrictive (intrinsic) lung disease
Is FEV1 <80% suggestive of obstructive or restrictive lung disease?
Obstructive
pH - 7.12
PaO2 - 56
PaCO2 - 80
PaHCO3 - 34
Diagnose me!
Respiratory acidosis, partially compensated
Moderate hypoxia SpO2 levels and who this is most common in
86-91%
Chronic lung conditions
pH - 7.55
PaO2 - 90
PaCO2 - 22
PaHCO3 - 24
Diagnose me!
Respiratory alkalosis, uncompensated
Breathing faster will increase or decrease blood pH?
Increase (more basic)