There are some differences in the blood pressure on our left and right upper limbs.

The reference range for the normal value of the blood pressure difference between the upper limbs is that our right arm has a systolic pressure of about 10 mmhg higher than the left arm and a diastolic pressure of about 5 mmhg higher than the left arm.

If the blood pressure measurement values ​​of both upper arms are more than 10mmhg differently, there are likely to be serious health problems.

The blood pressure difference between the upper limbs is large. In clinical practice, doctors highly suspect that the following situations occur.

First, aortic dissection.

Second, severe arteriosclerosis.

Third, arterial embolism.

In Yan Feifan's previous estimate, the blood pressure difference in Sister Na's upper limbs exceeded at least 15mmhg.

Based on Sister Na's symptoms, Yan Feifan judged that at least 90% of the time she had a thoracic and abdominal artery dissection tear.

This situation is very critical.

Once her artery dissection ruptures and bleeding, causing heavy bleeding in the chest and abdominal cavity, she will die in an instant.

Seeing that Yan Feifan was serious, Sister Na was also scared and stopped insisting and asked her colleague to drive her to an affiliated hospital...

After waiting for more than ten minutes, Zheng Libin finally returned to the office.

He called out a video about three minutes long on the office computer and asked Yan Feifan to watch it.

Seeing the content of the video, Yan Feifan glanced at Zheng Libin.

Oh my god, very tentative.

The first person in the video was dressed in a head-to-toe riot policeman, and a fully covered helmet was on his head.

The four people who appeared behind were all dressed in the same outfits.

After watching the video, Zheng Libin and Yan Feifan explained embarrassedly: "Doctor Yan, I'm sorry."

"The leader said that verification must be strict and convincing."

Yan Feifan smiled and said confidently: "This is what it should be, so that it can be convincing."

"Let's start to identify."

Zheng Libin stood up, made a gesture of invitation, and said, "Doctor Yan, if you are ready, please come with me."

"They are now on the small playground in the yard..."

Yan Feifan followed Zheng Libin out of the office.

We came to the yard of the Public Security Bureau. Yan Feifan saw five policemen in costumes in the basketball court of the yard, standing neatly in line.

They are all average tall, about 1.78 meters tall, and they are about the same size, fat and thin.

And they all wear full-face helmets.

Next to these five people, there were more than a dozen men and women in police dress or casual clothes standing.

Obviously, these people either came to watch the fun or wanted to witness it with their own eyes.

Zheng Libin led Yan Feifan to the team of five people and said in a serious tone: "Wait a minute, you will go as you should follow the previous shooting, just let me go."

"Whoever deliberately holds or deforms his actions will be punished according to violation of work discipline."

"Do you understand?"

"clear!"

The five people suddenly responded loudly, and Yan Feifan's ears were shocked.

Zheng Libin nodded with satisfaction, turned to Yan Feifan and said, "Doctor Yan, next, they will follow your instructions."

"Whoever you want to get out of the line and walk around, just one step at him."

"If you want him to leave, just give me instructions."

Yan Feifan looked at the five people a few times and said with a stern face: "Comrade Zheng, don't be so troublesome. Just let them go back a few times!"

Zheng Libin said lightly, looked at the five people, and shouted: "Follow the walking posture you took just now, move at will."

"Now...start!"

With his order, the five people in a row dispersed and walked back and forth within half of the basketball court.

Yan Feifan looked at it for a while and frowned.

In his mind, the walking postures of the five people, such as the speed and amplitude of their feet lifting, the angle of the swing of their forearm and hands, whether their heads are tilted forward or swayed, the size of their upper body swinging back and forth, left and right, and hip swings, were collected.

Compare the walking posture characteristics of the people he just watched.

only……

Yan Feifan closed his eyes and made every effort to make further analysis.

Zheng Libin, who was standing by, was always paying close attention to Yan Feifan.

He knew about the technique of posture comparison. Like appearance and sound comparison, there are specialized technical analysis software.

But there is no such software here in the district public security bureau.

And to his knowledge, its reliability is far less than that of appearance and sound analysis software.

Seeing Yan Feifan fell into deep thought, Zheng Libin was expecting his ability to recognize people to be effective, but he also hoped that it would not work.

If Yan Feifan verified his true abilities, it also means that there was something wrong with their previous investigation.

In the contradiction and trance, Zheng Libin noticed that Yan Feifan opened his eyes and hurriedly restrained his thoughts.

"Doctor Yan..."

Yan Feifan whispered to Zheng Libin: "Let them stop!"

"Okay, gather!"

With Zheng Libin shouting, the five people walking back and forth immediately stood in front of Yan Feifan.

Yan Feifan reached out and pointed at the first person on the right, and said directly and simply: "You are the third person in the video."

When Zheng Libin heard this, he didn't show any abnormality on his face.

Because, he couldn't figure out who the five people in front of him were now.

In order to prevent Yan Feifan from identifying people through the details of his clothes and shoes, he has changed all the clothes and shoes of these people.

Zheng Libin could only wait for them to take off their helmets before they could recognize who was who they were.

At this time, Yan Feifan pointed to the second person to the right, "You are the first person in the video."

Next, Yan Feifan skipped the third person directly, pointed to the fourth person on the right, and said, "You are the fourth person in the video!"

Yan Feifan pointed to the last person, "You are the second person in the video."

Finally, Yan Feifan pointed to the person who passed by in the middle and said in a certain tone: "You have never appeared in the video before, you are here to confuse my judgment."

As he finished speaking, a middle-aged policeman who looked in his forties strode towards him.

"Doctor Yan, hello, I am Yi Honggang, the director of the district bureau."

Yi Honggang introduced himself, looked at Yan Feifan, nodded and praised: "Doctor Yan, you really opened my eyes."

"Yes, I asked him to replace this person temporarily, and Captain Zheng didn't even know about it."

Yi Honggang ordered the five people again: "Put off your helmets!"

When they took off their helmets, Yi Honggang looked at Zheng Libin and asked: "Doctor Yan's identification is correct?"

Zheng Libin looked at the appearance of the five people in front of him, took a deep breath, and reported: "Director, Dr. Yan's identification is not bad at all."

"I can guarantee that during this period, no one will send information to Dr. Yan privately."

Yi Honggang nodded lightly and said in a deep voice: "Captain Zheng, Dr. Yan has proved to us through the fact that his ability to identify people is credible."

"Next, it depends on you."

Zheng Libin stood at attention and said, "Please rest assured, Director, we will dig three feet into the ground this time, and there will be no omissions or doubts..."

Yan Feifan took a police car and returned to the affiliated hospital.

As soon as he got out of the car, he received a call from Director Yi.

"Doctor Yan, I just got the exact news that Comrade Tang Na was diagnosed with a torn abdominal artery dissection in an affiliated hospital."

"The first aid expert said that her condition is very critical. Once the interlayer breaks, it will be a situation where there will be no life."

"Currently, Tang Na is preparing for the operation."
Chapter completed!