Before the operation, the family members said that they would not allow the patient to undergo an MRI examination, and the CT scan was not clear.
It is not impossible to measure the flow velocity. In fact, it is more valuable to compare the flow velocity with previous similar cases. Otherwise, the doctor would not suggest an MRI to measure the flow velocity before the operation.
Magnetic resonance imaging is performed by precision instruments and calculated by computers.
How do you estimate visually?
Wei Shangquan observed the movement of substances in the cerebrospinal fluid on the screen and said, "We can calculate the flow rate by observing the movement of dots inside."
We cannot say that everything Wei said is wrong. It is just a basic water flow calculation problem.
But if the matter was so simple, why would Senior Brother Huang be so anxious and sweating to find an excuse? In fact, it is difficult to figure out.
"What's the problem?" Wei Shangquan asked.
Sun Yubo scratched his head and stared at the fellow villager who was keeping him in suspense.
...
...
Shi Xu, who was standing next to him, asked, "Will it move?"
Isn't cerebrospinal fluid always flowing?
"It should be moving." said Tan Kelin.
After hearing what Teacher Tan said, Sun Yubo didn't dare to say that it would be nonsense to say that he didn't need to move.
If it’s not cerebrospinal fluid, then what is moving?
Senior doctors, not to mention surgical masters, can also learn something from other departments even if they are not specialists. Shi Xuxian admitted: "The knowledge of neurosurgery has long been handed over to the teacher. Doctor Cao, why don't you tell me, is it moving?"
In medicine, each department is like a mountain of distance. Only when you are a medical student can you seriously learn comprehensive knowledge. After graduation, if you work in a department for a long time, it is common to forget the knowledge of other departments. In addition, internships cannot help you learn comprehensive specialized knowledge in every department. It depends on the luck of each medical student.
Cao Yong said: "The brain moves just like other organs in the human body."
When people are alive, life lies in movement. Many organs and tissues in the body are constantly moving, such as the peristalsis of the intestines and the contraction of the gallbladder.
The heart is beating non-stop. Lin likes to say heart-brain-heart-brain, the heart and brain seem to be connected as one, which can be reflected here. When the heart contracts, the brain tissue volume increases and expands, and the brain substance moves toward the ventricle and skull plate, allowing the cerebrospinal fluid in the ventricle to flow out. When the heart relaxes, the brain tissue volume shrinks and the brain substance moves in the opposite direction, and the cerebrospinal fluid in the ventricle flows back up.
Those who had returned their neurosurgery knowledge to their teachers at the scene widened their eyes after hearing what Cao Yong said: the brain actually moves, and it is not like everyone imagines that the computer has a motionless appearance and only the nerves inside are doing things, but it contracts and expands like a heart.
"Don't you know?" Cao Yong asked them.
The people in General Surgery Class 2 fell silent.
In Cao Yong's opinion, this is really basic knowledge, and one should not forget it completely even if one is in a different field.
The other medical students, including Wei, were so frightened that their faces turned pale. They were definitely confused and did not quickly associate this knowledge point.
Do you understand? Huang Zhilei glanced at the group of people who dared to look down on him.
This velocity measurement is not simply measuring the water flow, but measuring the peak flow velocity during the systolic and diastolic periods of the heart. Because the systolic period is a process, and the diastolic period is also a process. The flow of cerebrospinal fluid is also a process, and it is impossible to have a uniform flow velocity. Only the peak value can be measured.
The heart beats more than once a second. The systolic and diastolic periods are very short, and the flow rate of the cerebrospinal fluid can be said to be changing rapidly.
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