Before the operation, the family members refused to allow the patient to undergo an MRI examination, as the CT scan was unclear.
It is not impossible to measure flow velocity. After measuring flow velocity, comparing it with similar cases in the past is actually of greater reference value. Otherwise, the doctor would not have suggested doing a magnetic resonance examination to measure flow velocity before surgery.
Magnetic resonance scans are performed by precision instruments and calculated by computers.
How do you measure it visually?
Student Wei Shangquan observed the movement of substances in the cerebrospinal fluid on the screen and said, "You can calculate the flow rate by observing the little bits of movement inside."
It cannot be said that everything that Mr. Wei said is wrong. It is a basic water flow calculation problem.
But if the matter was so simple, it was hard to figure out why he, Senior Brother Huang, needed to be so anxious to find excuses.
"What's the problem?" Wei Shangquan asked.
Sun Yubo scratched his head and glared at the traitorous fellow.
Shi Xu, who was standing next to him, said, "Can it move?"
Isn’t cerebrospinal fluid always flowing?
"It should be moving." Tan Kelin said.
After hearing what Teacher Tan said, Sun Yubo didn't dare to say that it was nonsense to say that he could not move at all.
What's moving if it's not cerebrospinal fluid?
Doctors with more seniority, not to mention surgical experts, even if they are not in this specialty, can still understand some things in other disciplines by analogy. Shi Xuxian admitted: "The knowledge of neurosurgery has long been handed back to the teacher. Doctor Cao, why don't you tell me, is it a move?"
In medicine, different subjects are usually separated by mountains. You can only study comprehensive knowledge seriously when you are a medical student. After graduation, it is common to forget knowledge about other subjects after working in one department for a long time. In addition, it is not possible to learn comprehensive professional knowledge in each department during internship. It depends on each medical student's own luck.
Cao Yong said: "The brain moves like other organs in the human body."
As long as a person is alive, life lies in movement. Many organs and tissues in the body are always moving, such as intestinal peristalsis and gallbladder contraction.
The heart is beating all the time. Clinically, we like to talk about the heart and brain. The heart and brain seem to be connected into one, and this can be seen here. When the heart contracts, the volume of brain tissue increases and the brain parenchyma moves toward the cranial plate of the ventricles, allowing cerebrospinal fluid to flow out of the ventricles. When the heart relaxes, the volume of brain tissue shrinks and the brain parenchyma moves in the opposite direction, causing the cerebrospinal fluid in the ventricles to flow backwards.
Those at the scene who had returned their neurosurgery knowledge to the teacher stared at Cao Yong’s words: the brain can actually move, and unlike what everyone imagined, the computer’s appearance does not move and only the nerves inside do things. It's like a heart that contracts.
"Don't you know?" Cao Yong asked them.
The two general foreigners collectively fell silent.
In Cao Yong's view, this is such basic knowledge that one should not forget it completely even if it is as far away as a mountain.
Several other medical students, including Student Wei, were so frightened that their faces turned pale. Their minds were definitely blocked and they did not quickly think of this knowledge point.
Do you understand? Huang Zhilei's eyes scanned the group of guys who dared to look down on him.
It can be seen that this velocity measurement is not simply a measurement of water flow, but a measurement of the peak flow velocity during the systolic and diastolic phases of the heart. Because the heart is a process during contraction, and it is also a process during diastole. The flow of cerebrospinal fluid is also a process, and it cannot be a uniform flow rate. Only the peak value can be measured.
The heart beats more than once per second. The systolic and diastolic periods are very short, and the flow rate of cerebrospinal fluid can be said to change rapidly.
