Before the operation, the family members refused to allow the patient to undergo an MRI examination, as the CT scan was unclear.
It is said that measuring flow velocity is not impossible. After measuring the flow velocity, comparing it with similar previous cases is actually of greater reference value. Otherwise, the doctor would not have suggested performing an MRI examination to measure the 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 question.
But if the matter was so simple, why would he, Senior Brother Huang, need to sweat his head out and come up with excuses? It was actually difficult to figure out.
"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 he couldn't move at all. It was nonsense.
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 learn something about other subjects by analogy. Shi Xuxian admitted: "The knowledge of neurosurgery has long been handed back to the teacher. Dr. Cao, it is better to
Tell me, it’s a move, right?”
In medicine, different departments are usually separated by mountains. You can only study comprehensive knowledge seriously when you are a medical student. After working in the same department for a long time after graduation, it is common for you to forget the knowledge of other departments. It is not possible to do internships again.
It depends on each medical student's luck to learn comprehensive professional knowledge in each department.
Cao Yong said: "The brain moves like other organs of 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. This can be seen here. When the heart contracts, the volume of the brain tissue increases and the brain parenchyma expands toward the ventricular skull plate.
Exercise allows the cerebrospinal fluid in the ventricles to flow out. When the heart relaxes, the brain tissue volume 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 after hearing what Cao Yong said: The brain can actually move, and it is not like the computer that everyone imagines. The 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 shouldn't forget it completely even if it's as far away as a mountain.
Several other medical students, including Mr. 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 systole and diastole phases of the heart respectively. Because the heart systole is a process, and the diastole period is also a process. The flow of cerebrospinal fluid is also a process and cannot be uniform.
The flow rate can only be measured at the peak value.
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.