IR numbers to know Flashcards
Aortic arch run
20 for 30
Abdominal aorta run
20 for 20
renal artery run
5 for 10
pulmonary artery run
25 for 50
3 French = ______
1 mm
1mm is equivalent to how many French?
3 Fr
hole created by a sheath is how many French larger than the French of the sheath?
2 French larger. sheath Fr measures the INNER diameter only (aka - what catheter will fit through)
1 Fr = _______ mm
1 Fr = 0.3 mm
when do you stop Heparin
2 hours before
When do you stop Coumadin/INR prior to an IR procedure
5-7 days prior, INR > 1.5
ideal platelet count prior to IR procedure
> 50 (or > 75)
when do you stop plavix or ASA prior to an IR procedure
5 days prior
how many minutes of arterial compression after you pull femoral arterial sheath?
15 min
If you need to immediately reverse INR (INR > 1.5). What can you do?
Vitamin K; IM 25-50 mg. Or FFP and cryo
how much thrombin should you inject into a pseudoaneurysm
500-1000 units
balloon should be what % bigger than the vessel diameter?
10-20%
what does a 10 x 6 balloon mean?
10 mm in diameter, 6 cm in length
ideal time to remove an IVC filter
3 months
mega cava
28 mm
> 28 mm IVC
megacava
need a birds nest filter (can do this with IVC up to 40 mm)
Carotid doppler:
PSV >230 cm/s
>70% stenosis
Carotid doppler:
PSV >125 cm/s
50-69% stenosis
Carotid doppler:
PSV <125 cm/s
< 50% stenosis
“normal” aka this is not hemodynamically significant
ICA/CCA ratio >4.0
>70%
ICA/CCA ratio >2.0
50-69%
ICA/CCA ratio <2.0
< 50%
TIPS stenosis numbers
STENOSIS:
- abormally high or abnormally low; >190 cm/s or < 90 cm/s
- increase or decrease > 50 cm/s compared to prior
- MPV low flow <30 cm/s
in the renal artery, normal arterial acceleration time
< 0.07 s
IMH mortality predictors
ascedning aorta > 5 cm
IMH > 2 cm
pericardial effusion
IMH strongest predictor of progression to dissection?
max aortic diameter > 5cm
ideal TIPS pressure gradient
< 12 mm Hg
reduced to between 6-8 mm Hg if the indication is intractable ascites
serum half life of tPA
5 minutes
the drug concentration will fall to a negligible level after about 5 half lives which is after about 25 min
after how much time will the serum concentration of tPA fall to a negligible (<5%) level?
the drug concentration will fall to a negligible level after about 5 half lives which is after about 25 min
after 25 min tPA will be at what serum level?
the drug concentration will fall to a negligible level (<5%) after about 5 half lives which is after about 25 min
What is the typical wire diameter used to fit trhough a 21 Ga needle?
0.018”
lowest hemorrhage rate necessary for detection of GI bleeding by catheter angiography?
0.5 mL/min
lowest hemorrhage rate for detection of a GI bleed on Tc-99m scan
0.04 mL/min
ten times more sensitive than angiography
drawback to Tc-99m is not precise anatomic localization
normal right atrial heart pressures
0-8 mmHg
PAVM size criteria for treatment
>3 mm or symptomatic (prior infarct or brain abscess)
massive hemoptysis definition
>300 mL/24 hours
celiac artery arises at what vertebral body level
T12
SMA arises at what vertebral body level?
T12-L1
Renal arteries arise at what vertebral body level?
L1-L2 disc space
The IMA arises at what vertebral body level?
L2-L3 disc space
A bleeding rate of _________________ is generally required to be angiographically positive.
A bleeding rate of 0.5 to 1.0 mL/min is generally required to be angiographically positive.
A tagged red blood cell scan can detect bleeding rate of ________________.
0.2 to 0.4 mL/min.
Vasopressin can only be used for _________ before tachyphylaxis (lack of further response) develops
24 hours
alternative treatment for lower GI bleed (not coiling). Medication and dosing
Vasopressin is directly infused into the SMA or IMA.
The dose of vasopressin is 0.2–0.4 units per minute (100 units mixed in 500 mL saline given at 1 mL/minute), given as a continuous infusion for up to 24 hours.
Portal hypertension is defined as a portosystemic gradient of:
> 5 mmHg
volume of contrast for a knee arthrogram?
40 mL
volume of contrast for a wrist arthrogram?
2-3 cc
amount of albumin infused for every 1L ascites removed during large volume paracentesis (>5L)?
6-8 grams infused per L removed
typical maximum volume of pleural fluid removed during thoracentesis to prevent re-expansion pulmonary edema?
< 1 - 1.5 L
hemodynamically significant arterial gradient?
> 10 mmHg
hemodynamically significant venous gradient?
> 3-5 mmHg
high impact
initial f/u scan after microwave ablation for HCC
**f/u in 4-6 weeks w/ MR or CT
then…3-6 months
goal for activated clotting time for arterial and venous procedures
200-300 s
MELD score threshold for TIPS
<18-20
Y-90 half life
64 hours
Rutherfod stage 4 classification presentation
rest pain
embolic particle size for bronchial artery embo?
big ones so they don’t occlude the Anterior spinal artery - should be 700-900 microns
velocity for 70% stenosis in the celiac artery
> 200 cm/s
velocity in SMA when > 70% stenosis
SMA > 275 cm/s
