What medications are used? Propofol will be given through an I.V. to induce sleep. This medication has a short duration of action and a rapid recovery time and is administered to make sure you remain asleep during the entire MRI study.
Generally, MRIs under anesthesia are performed under sedation, although sometimes they are performed under general anesthesia. Sedation is characterized as being in a state between relaxed and very sleepy, but not quite unconscious.
It's common to use a combination of Versed (a benzodiazepine) and Fentanyl, an opioid medication commonly prescribed for pain and sedation. You must have a physical and medical history within 30 days prior to your MRI in order to ensure the safety of these medications.
Anaesthesia and sedatives
An MRI scan is a painless procedure, so anaesthesia (painkilling medication) isn't usually needed. If you're claustrophobic, you can ask for a sedative to help you relax. You should ask your consultant well in advance of having the scan.
Dexmedetomidine acts on the alpha-2 receptor to produce a natural sleep-like condition [4], and is thus used for MRI sedation in patients with claustrophobia [5,6].
How long does an MRI scan take? A single scan may take a few seconds or 3 to 8 minutes. You may be asked to hold your breath during short scans. The total scan lasts 15 to 90 minutes, depending on the size of the area being scanned and how many images are needed.
Of the 939 patients 134 (14.3%) required oral sedation, i.v. sedation, or general anesthesia to tolerate MRI. This group was 35.8% male, 64.1% female (control group 48.1% male, 51.9% female). Of those requiring sedation, 89 patients (66.4%) were having brain MRI (male n = 29 or 32.6%, female n = 60 or 67.4%).
When not properly accommodated during an MRI, claustrophobic patients may experience panic attacks, which can bring on increased heart rate, difficulty breathing, chills, sweating, and other distressing symptoms.
Thus, claustrophobia preventing MR imaging is a common problem. Between 1% and 15% of all patients scheduled for MR imaging suffer from claustrophobia and cannot be imaged, or they require sedation to complete the scan (mean: 2.3%; 95% confidence interval: 2.0% to 2.5%) [3].
The use of immobilization masks ensures that the MRI and CT exams are performed in the same treatment position (TP).
Infants can be scanned without sedation in some cases using feed and swaddle, but longer and more complex scans in older infants might require sedation. Young children (ages 1–6 years) usually require sedation for studies other than rapid ventricle checks.
An open-bore MRI machine is open on both ends and enclosed by a tube-like bore; it offers a wide opening of approximately two feet. A conventional MRI is also open on both ends but has a smaller opening.
A. Diazepam 5 mg po, once for MRI study or Lorazepam 1mg po, once for MRI study.
Since the MRI machines are magnets, it is best to not apply deodorants, antiperspirants, perfumes, or body lotions before the examination. These items contain metals that might interfere with the magnetic field inside the MRI machine and cause you to have distorted images and wrong results.
Reactions can include anything from mild anxiety to all out panic attacks and hyperventilating. More to the point, researchers in one study found that as many as 13% of all patients who received an MRI (Magnetic Resonance Imaging), reported feelings of panic and or anxiety during their MRI.
MRIs show common structural abnormalities among patients with depression and anxiety.
The technologist will ask you several times to hold your breath and stay still to be able to get good pictures. You will be asked each time to hold your breath for twenty seconds. This part is very important because we cannot do the MRI examination, if you cannot hold your breath long enough.
Immediately after the MRI
You may be asked to wait while the radiographer checks the quality of the pictures. In some cases, you may be asked to get back into the MRI scanner so that more pictures can be taken. If the pictures are satisfactory, you can get dressed and go home.
Getting an MRI can take between 15-90 minutes, so remember to use the restroom before your scan begins because you won't get another chance until your scan is over. Usually, if you stop drinking water for 1-2 hours before your appointment, you should be all right.
Many patients find that an oral benzodiazepine, such as Xanax, Ativan, or Valium, taken prior to the exam sufficiently relieves their anxiety and allows them to complete an MRI with relative ease.
Many MRI procedures don't require your head to go inside the machine at all, but if you need a head or upper spine MRI, you'll appreciate the fact our machine provides a full 12 inches of clearance between your face and the wall – relieving stress for our patients with claustrophobia.
If you need to cough, sneeze or move, the tech can pause the scan. The MRI technician can communicate with you through an intercom.