Pulmonary (Exam #2) Flashcards
What is always the initial study for pulmonary diagnostics, and what is the preferred view?
X-RAY (PA view)
What are the six anatomical landmarks that should be considered when reviewing pulmonary diagnostic imaging?
- Airway
- Bones
- Cardiac silhouette/PA
- Diaphragm
- Edges
- Fields
Why would you consider a high resolution CT (HRCT) over a low dose CT (LDCT), and vice versa?
- HRCT: better detail
- LDCT: less detail but good for SCREENING
What is the primary risk associated with CT scans (compared to an x-ray), and in what population should this be most considered?
MORE RADIATION
- Pediatrics are more radiosensitive than adults
What are pediatrics at increased risk for with CT (2)?
- Leukemia
- Brain tumors
What is there a link between with pregnant women and CT scans?
In utero exposure linked to pediatric CA mortality
What type of contrast is used for CT? What type of contrast is used for MRI?
- CT: iodine
- MRI: Gadolinium
What three conditions should be evaluated with contrast on CT scan?
- Vessels
- Malignancy
- Chest trauma
When using contrast with CT, which three complications/risks should be considered?
- Allergic reaction to contrast
- Contrast-induced nephropathy (CNI) = AKI
- Development of lactic acidosis if taking Metformin
What two medications can be used to pre-treat an allergy to Iodine contrast?
- Prednisone
- Benadryl
What two conditions (either or) must be met to be considered contrast-induced nephropathy (CNI)?
- Serum Cr >0.5 mg/dL
OR - > 25% from baseline
Before using CT WITH contrast, what five risk factors should be considered?
- 60+ years old
- History of renal disease
- HTN with meds
- DM
- Taking Metformin
What is the preferred method for assessing pulmonary vasculature, and why?
CTPA (CT Pulmonary Angiography) - Less invasive - Less expensive - Less time (than Catheter-Directed Pulmonary Angiography (Direct PA))
What is the gold standard for PE evaluation?
Catheter-Directed Pulmonary Angiography (Direct PA)
What two exams should be considered if Catheter-Directed Pulmonary Angiography (Direct PA) is inconclusive, but there is still high suspicion for a PE?
- CTPA
- V/Q scan
What is the primary risk associated with Magnetic Resonance Imaging (MRI/MRA)?
Nephrogenic systemic fibrosis
What are the two primary indications for using a V/Q scan?
Test of choice for…
- Diagnosis of PE in pregnant women
- Negative CR but high PE suspicion
How is a PET scan measured, and what finding is considered “possible malignancy”?
FDG via measurement of SUVs
- SUV >2.5 = possible malignancy
What finding is considered normal on US, and what finding is indicative of PTX on US?
Normal: seashore sign/motion lung beach
- PTX: barcode/stratosphere sign
What pulmonary diagnostic tool is commonly used in patients with obstruction of trachea or proximal bronchus?
Rigid Bronchoscopy
What two things can be determined using FEV-1/FVC ratio?
- Determine obstructive vs. restrictive
- Define severity of obstruction
What position is preferred for spirometry testing, and why?
Sitting preferred
- Less likelihood of syncope
What is the technique for spirometry testing (5 steps)?
- TIGHT SEAL over mouthpiece
- Relax and breathe normally
- Take deep breath in
- Forcefully exhale all air
- Take another deep breath in, then STOP
What test is used to evaluate reversibility, and for what disease is this often used?
What two findings are indicative of reversibility?
Bronchodilator Testing (specifically for asthma, which is reversible) - Reversibility if FEV-1 increases by 12% AND 200 mL