I don't know how much heating is involved, but they run 14 KW RF amps in the current version. Plus the magnetic gradients also cause some eddy heating, as they pass through the body. Your heart rate would go up to remove the heat.
56 BPM would be REALLY unusual for a woman unless she is a current olympic athlete.Jon
56 is my wife's normal heart rate ;-) ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
You're doing your part correctly. Someone has to keep an eye on the doctors and nurses to make sure things are going according to plan. I've had a few hospital adventures and believe that I may have prevents a few small disasters by simply asking the right questions. Suggestion: Keep a running log book of what happens, who does what, and what decisions are made and by whom. It's very handy for remembering details a few months later.
The patient is normally sedated before an MRI in order to reduce anxiety, to keep movements to a minimum, and speed up the procedure. The traditional normal heart rate is 60 to 100 beats per minute, while the current ideal values are 50 to 70 beats per min. If the numbers in parenthesis were the heart rate, the sedative is not working, or the patient might have arrhythmia, or something else. Also, the numbers seem to follow the blood pressure figures rather closely, which is indicative of something related to blood pressure, not heart rate.
Notice the number in parenthesis. It could be almost anything and is NOT labeled. The display shows a sky high heat rate, systolic BP, diastolic BP, and unlabeled number in parenthesis. From the text, that could be: "...heart rate, arterial blood pressure, central venous pressure, pulmonary artery pressure, pulmonary capillary wedge pressure, left atrial pressure, cardiac output, arterial blood saturation, and blood temperature. Furthermore, these values can be used to calculate other values, or parameters, or used to diagnose and treat the patient's condition." In other words, it could be almost anything.
If you could get the maker and model number of the BP monitor, we can possible download the instructions and see what the numbers might mean. However, my guess(tm) is that it was something picked off a menu in the machine.
Best wishes to your wife. I hope she survives this in grand style.
-- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
I've never been sedated - but MRI's obviously don't make me anxious. I neve r worked on the design of one, but I knew people who did, and tend to react to remarks about the machine intended to put me at my ease with lines like "gorgeous stacks of expensive electronics" or the story about the noise fr om the scan coils making my father irrationally anxious.
Stress raises both blood pressure and heart rate - the heart has to work ha rder to push more blood around the system, which is to say it has to contra ct more vigorously, more rapidly and more often.
-- Bill Sloman, Sydney
I've had two MRI's for kidney stones at the same facility over about a
10 year period. I was first sedated both times. I was told it was "routine" and helped keep me still. Sedation and MRI seem to be quite common:I helped design the VMOS RF power amplifier for one, when MRI machines were called NMR imaging machines. I never got to see or play with the finished machine. Discussions with the engineers was limited to technical details.
Yep. I'll stand on my best guess(tm), which is that the number in parenthesis is programmable and could be anything that the machine can measure or calculate. For all I know, it could be calculating the optimum amount to bill the patient or insurance company.
-- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
Not a woman, but my normal resting heartbeat is ~56bpm (
Probably because of the pain? I had an MRI ten years ago, without any sedation. I'm a little claustrophobic, too, but the constant air movement kept it in check.
...or measure.
You need an arterial line to measure it. Possible, but not likely for an MRI. There would also be two numbers, like normal BP.
The MAP is a single number and it can be measured invasively (most accurate), by calculation (least accurate), and by the BP machine (what the machine shows).
Here is a reference design that explains how it's done.
Yep, I had forgotten. Three MRI's in 10 years (out of 5 stones in about 30 years). I have to confess that I don't remember much from these three incidents. However, I can assure you that it's very difficult to relax or stay still with an active kidney stone. In two incidents, instead of a "mild sedative", I was given a much stronger pain killer. In one incident, it was a morphine derivative. I can see why the drug users enjoy opiates. It still hurts, but I didn't care. I suspect my circumstances were very different from Jim's wife's current situation.
-- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
I was in a MRI last year, no sedation
I know someone whos daughter did that - came into the house crying with neck at horrid angle... Turned out OK too, eventually.
At the hospital they called it "trampoline season". They also get a lot of them from bouncy castles too.
-- John Devereux
I've had a number of head MRIs but have never been sedated.
When I had my cat scans, I didn't need to be sedated!
-- John Larkin Highland Technology, Inc lunatic fringe electronics
nope - there is no diagnostic use for mean pressure and there is no way to measure it by non-invasive means. And it can't be average as then the calculation is simply wrong. BPM is useful and trivial to calculate on any machine that does blood pressure. I know it is BPM.
Jim PM'ed me about his wife heart rate which another machine indicated was totally stable over the entire procedure at 59 bpm. The only way to be this low and stable would be a heavy anesthetic.
Jim, just telephone and ask the guys what it is.
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I did that long ago. Was turning a long string of lazy high back-flips on a trampoline, everything going fine. Without noticing, the last one was 18
0 degrees short, did a perfect upside-down pile driver from high up. Hit t he deck, neck hinged, face snapped into my chest, and wound up folded, layi ng chest-down on my own head facing up, such that my nose left a nasty brui se on my sternum. Yes, my sternum.I thought I was a goner, the strain in my neck seemed far beyond what shoul d have broken it, but, that failing to materialize, I gingerly uncoiled mys elf after a few minutes had passed and life goes on.
It's amazing we live as long as we do.
P.S. I quit using trampolines.
Cheers, James Arthur
Must be an engineer-to-be thing...
I did a similar stunt in High School gym class, but I landed on the gymnasium floor on my left shoulder, I grabbed at the edge of the trampoline stand during the fall and managed to slow myself down... thought I had broken everything, but no ;-)
I really liked the trampoline... continued in spite of that stunt. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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n a trampoline, everything going fine. Without noticing, the last one was
180 degrees short, did a perfect upside-down pile driver from high up. Hit the deck, neck hinged, face snapped into my chest, and wound up folded, la ying chest-down on my own head facing up, such that my nose left a nasty br uise on my sternum. Yes, my sternum.uld have broken it, but, that failing to materialize, I gingerly uncoiled m yself after a few minutes had passed and life goes on.
trampolines seem to come and go, when I was a kid in the 80's trampolines seem to be considered the most dangerous thing in the known universe and no one had one
-Lasse
I was clinically dead for a while last March. Three skull fractures, two brain bleeds, one broken rib. Mo did CPR so here I am, second life.
I'm in a research study now and get a head MRI every six months. They pay me $250 a session.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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a l h ton a trampoline, everything going fine. Without noticing, the last one was 180 degrees short, did a perfect upside-down pile driver from high up. Hi t the deck, neck hinged, face snapped into my chest, and wound up folded, l aying chest-down on my own head facing up, such that my nose left a nasty b ruise on my sternum. Yes, my sternum.
ould have broken it, but, that failing to materialize, I gingerly uncoiled myself after a few minutes had passed and life goes on.
That officially makes you "John of the Dead!" (pop culture reference)
Good for Mo. My Dad's sweetie was in the next room and thought he'd dropped something. May he RIP.
Sweet!
Cheers, James Arthur
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on a trampoline, everything going fine. Without noticing, the last one wa s 180 degrees short, did a perfect upside-down pile driver from high up. H it the deck, neck hinged, face snapped into my chest, and wound up folded, laying chest-down on my own head facing up, such that my nose left a nasty bruise on my sternum. Yes, my sternum.
hould have broken it, but, that failing to materialize, I gingerly uncoiled myself after a few minutes had passed and life goes on.
Kids in the neighborhoods seem to have them now, but fenced in with safety nets so they can't hit the dirt.
Long before my mishap Dr. Dad warned they were a bad idea. Loads of fun, one mistake, and a lifetime to pay. He knew a few.
I'm not against 'em, just had my thrills, thank you very much.
Cheers, James Arthur
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