ACEI (Captopril) Renal Scan Flashcards
RVH
renovascular hypertension
what causes RVH?
renal artery stenosis. (RAS)
indications for a ACEI renal exam
- severe hypertension resistant to meds
- abrupt or recent onset of hypertension
mechanism of Captopril
if the pathway is blocked, the ACEI will cause the GFR to drop
dose of Capoten
25-50 mg
method of admin for Captopril
PO, chew and swallow 60 min prior to imaging
patient prep
- off ACEI for 1 week
- well hydrated and off diuretics
- off Ca channel blockers
- NPO 4 hrs
explain 1 day protocol
- baseline done first with 37 MBq
- wait an hour
- Captopril scan with 370 MBq
explain the 2 day protocol
- Captopril first
- normal? don’t need baseline
dose for both days = 90-370 MBq
how often are we monitoring the patient’s BP?
every 15 mins for the next hour (prior to imaging)
Lasix can’t be administered during the time RP is given for a Captopril study. T/F
False.
can be given to ensure clearance
alternative to Captopril
Enalaprilat (Vasotec)
method of admin for Vasotec
IV infusion, over 3-5 mins
dose of enalaprilat
40 ug/kg, max 2.5 mg
instead of waiting for an hour after Captopril admin, when do we inject the RP when using Vasotec?
15-20 mins after admin.
BP monitored every ____ when using enalaprilat
5 mins
negative for RAS/RVH
renogram curve looks the same with or without ACEI
how will the renogram look if we use MAG3 and the pt has RAS?
- uptake and secretion is okay
- excretion will be decreased due to decreased GFR
how will the renogram look if we use DTPA and the pt has RAS?
- fall in peak function
- decrease uptake and excretion
- decrease in relative function (-10% from baseline)
