Chapter 601: The Magical Method of Cardiovascular Imaging (Go to Bed when You Are Tired and Get 10,000 Rewards Plus Update 3)
When it comes to injecting a contrast agent (therapeutic solution) into the rabbit's heart, it's a fairly easy battle. Gretel cheered up and made all preparations:
Anesthesia! In the past, it was all local anesthesia + bandage, but now I don’t skimp on the spells, I have to have general anesthesia!
EKG! Connect the recording device and pay attention to whether there is atrial fibrillation or abnormal heart rhythm at any time!
Invasive sphygmomanometer arranged! A student stood next to him, staring at the mercury column without blinking, ready to report any abnormalities at any time!
The blood oxygen monitor is arranged!
The heart is a sensitive and delicate bastard. If you touch it or do some operations, it will cause you problems at any time. Arrhythmia, ventricular fibrillation, cardiogenic shock, cardiac arrest, all come in different forms.
This is true for normal hearts, let alone a heart with problems.
When Grete had a patent ductus arteriosus, he tried countless times before he could control the vines without touching the heart and blood vessels or causing spasm. Now I need to push the healing potion inside...
God knows if the inner wall of the heart touches the healing potion, it will cause some trouble for you.
"ready or Not?"
"Ready!"
Leon Carlos on the left, Pastor Matthew on the right, answer together. Grete took a deep breath, spawned vines, cut the rabbit's femoral artery, and let the vines snake up along the femoral artery...
The hollow vines, less than one millimeter in diameter, travel up from the femoral artery, abdominal aorta, and thoracic aorta and then retrograde into the heart. Then, the end of the vine opened slightly, and the end in Gretel's hand expanded slightly, one, two, three!
Draw back a small amount of blood to make sure there is no air inside the vine. Then, connect the syringe and inject the healing potion!
In the meditation field of vision, the faint golden light of the healing potion only advanced less than a foot, and the speed became slower and slower. Finally, it disappears into the blood vessels and mixes with the blood.
"Uh...teacher..."
"Uh... Gretel..."
On the left and right, two spellcasters with [Detection Magic] turned on and staring at the rabbit looked at Gretel together. Grete shook his head helplessly:
"Oh, the pressure is too little..."
There is no way, the power of the heart to pump blood is so great. The pushing pressure is too small and cannot withstand the blood pressure of the arteries. The developer cannot be pushed into place at all and will only be pushed back!
Again!
Still not working, the push force is still not enough. It has to be faster and stronger!
Grete waved away the vines, stopped the bleeding in the rabbit's femoral artery, glanced at the invasive blood pressure monitor, and began to calculate:
The invasive blood pressure monitor inserted into the brachial artery reads...
Converted to the blood pressure at the aortic root, it should be...
The pressure with which he pushes the contrast medium should be... The speed with which he pushes the contrast medium should be...
"I go!"
Gretel suddenly shouted. The casters next to him looked at him inexplicably, watching him click the syringe, and steam almost came out of his forehead:
According to the results he calculated, it was basically necessary to inject 2.5 ml of therapeutic potion into the heart of the rabbit within 1/4 second under a pressure of 130 mm of mercury! And injection pressure…injection pressure…
It’s 30,000 millimeters of mercury!
Thirty thousand!
Grete's vision went dark.
Did he make a miscalculation? !
Gretel sincerely hoped that he had made a mistake. But he did remember that in the hospital in his previous life, high-pressure syringes were used for cardiac imaging. That thing is not a needle, but a machine with various parameters to adjust.
He really didn't pay attention to the specific parameters at that time...
If the injection pressure really needs to be so high, then this number cannot be achieved by hand pressure at all! Only by relying on high-pressure syringes and the power of machinery and electronics!
Reason told him: It's not bad to be wrong, you will know after you try it. Moreover, he can really achieve the simple method and simple conditions for doing this kind of experiment.
"I'll give it a try!"
Leon Carlos watched inexplicably as Grete dropped the rabbit and ran out of the laboratory. He hurriedly followed behind, watching Grete rummaging through the cabinets, finding the mercury tank, inserting the syringe under the mercury, and pressing the syringe plunger hard...
Can't press.
Can't press it at all.
I want to use the power of my thumb to push 10 ml of water under 13 cm of mercury in 1 second... Just dream, even with this power, the friction of the glass syringe is not enough; I want to have enough friction The strength of the syringe is not enough...
Otherwise... try another method? Gretel thought about it and came up with a second idea:
Use transfiguration to construct a metal stand, attach the syringe to the stand, attach the vines, and insert it deep into the base of the mercury. Bless the syringe with a [Higher Demonized Weapon] to increase its strength; then, stand farther away——
"[Magic Missile]!"
Bang!
The magic missile accurately hit the piston head. With good luck, the syringe did not break, but flew straight ahead; with even better luck, the frame withstood the test and did not fall down.
In an instant, the liquid in the piston was pushed hard, all of it shot into the bottom of the mercury, pushing away a small group of transparent liquid.
"Yeah! It worked!"
Gretel jumped up and cheered. He tried a few more times, found the optimal output of the [Magic Missile], and returned to the operating room happily holding the metal stent. Magic version of high-pressure syringe, success!
The stent was fixed, the syringe was attached, the vine was attached, and the cardiovascular imaging was attempted again. The vine climbed up the femoral artery and penetrated into the rabbit's heart. Pull back, connect the syringe, one, two, three!
【Magic Missile】!
Under the vision of meditation, the image of the light golden healing potion quickly moved forward along the conduit, forward...
"Bang!"
The vines exploded.
The vines spawned by magic are still of a plant nature after all, and the pipe walls are not strong enough...
Woo...
Gretel tried again, and again, and again. He finally sadly discovered that even if he was a sixth-level magician and a sixth-level priest of the God of Nature, the vines he spawned...
It also doesn't have enough strength.
It's very tragic.
So, in the end, it’s still stuck on the material?
The assistants on both sides looked at his face, sometimes happy, sometimes worried, sometimes cheering, sometimes holding their heads in frustration. Pastor Matthew asked cautiously:
"Gretel, what happened? Can we help?"
Gretel wiped his sweat and briefly explained the purpose of his experiment, the experimental concept and the difficulties he encountered. Pastor Matthew listened silently, thought for a moment, and made a serious suggestion:
"If the pressure in the arteries is so high...why not go through the veins?"
…that’s a really good question. Grete wiped off the second sweat, sat down on the round stool in the corner, and said in a tired voice:
"What is the path of blood circulation?"
Regarding the path, Pastor Matthew has actually read the information after working in the hospital for so long. However, when he was asked to speak for a moment, he couldn't. Grete glanced at him, and Leon Carlos took a step forward with a loud voice:
"From the left ventricle to the aorta, then to the arteries at all levels, and back from the veins at all levels, into the right atrium. The right atrium goes to the right ventricle, the right ventricle goes to the pulmonary artery, then returns from the pulmonary veins to the left atrium, the left atrium goes to the left ventricle, and again Inject into the aorta.”
"Ah...oh!"
Pastor Matthew followed his description and suddenly understood. Therefore, when the therapeutic solution is injected intravenously, it enters the right atrium from the vein, then circulates in the lungs, and then reaches the left atrium.
In that case, the amount of healing potion required would be too large.
And there is a saying that healing potions cannot replace blood after all. No one can say what the consequences will be if a large amount of therapeutic potion is injected into the heart and circulates in the blood vessels of the lungs.
"It really doesn't work, so I have to try from the vein..."
Grete lamented softly. He pushed himself to his feet and once again sent vines growing up from the rabbit's femoral vein. This time, push in 2.5 ml of healing potion, disperse it from the rabbit's heart into the lungs, and it will be gone immediately;
Pushed in 5 ml again at once, still nothing;
The dosage of the therapeutic potion was increased to 10 ml or 20 ml. Finally, the golden light of the therapeutic potion appeared on the image of the pulmonary vein returning. However……
"Beep beep beep—"
EKG cloud screen death alarm. Grete turned his head to look at the waveform, scanned the blood oxygen monitor, immediately waved away the vines, and began to press the rabbit's heart:
Ventricular fibrillation! The color of the blood oxygen monitor shows an ugly dark red instead of a vibrant bright red!
The potion must have been pushed too much, replacing the blood, and the heart was starved of oxygen...
The first attempt failed. The second attempt failed. After three consecutive failures, Gretel sighed and rejected the plan:
"Let's think about how to withstand the arterial pressure..."
It’s really a headache if I can’t learn the materials well. But think about the materials of future interventional catheters, such as polyamide, polyurethane, hydrophilic coating, tensile strength, blood compatibility, biocompatibility...
Gretel still felt that if he could not get rid of his liver for another two lifetimes, he might as well find a way on the vines.
The intensity cannot be reached. Is there any other way to get around it? It would be great if he was skilled enough in space magic and could cross the space and deliver the healing potion directly to the place...
"Well... how about letting the vines swallow the potion and spit it out again on the ground?"
Pastor Matthew suggested imaginatively. Gretel was just about to say, "Are you kidding me?" when suddenly something came to his mind:
That’s right!
This is a vine, not a conduit! It's alive, not dead! It can induce birth and control its transformation!
It would be great if the healing potion could be sent directly to the front end through continuous pushing from inside the vines, and accumulated together, and then the vines on the front end would directly dissipate!
Anyway, the aortic arch is also thicker, much thicker than the femoral artery. Let the vines grow thicker in this section to accommodate more healing potions without touching the aortic wall. This method...
It's more feasible than fiddling with high-pressure syringes to death, isn't it?
Just do it. Grete jumped up from the stool, gearing up, and started experimenting again. This time, the vine continued to squirm, and the front end swallowed the healing potion, growing thicker and stronger. Finally, plunge into the heart——
The pale golden magic image finally exploded perfectly in the rabbit's left atrium.
success!
****
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To be honest, I checked the information today and found out that the bolus pressure of cardiovascular contrast agent is 600 psi (pounds force per square inch) for pediatric left ventriculography... I was shocked when I converted it to millimeters of mercury... 31,028 mm of mercury!
ps: A 10ml potion for treating minor injuries costs 50 gold coins. Let’s do some calculations, how many gold coins have been lost so far?