There's a slight difference in blood pressure between our left and right arms.
In a normal person, the systolic pressure in the right arm is about 10 mmHg higher than in the left, and the diastolic pressure is about 5 mmHg higher.
A difference of more than 10 mmHg between the arms can indicate a serious health problem.
Clinically, a large difference in blood pressure between the arms leads doctors to highly suspect one of several conditions.
First, aortic dissection.
Second, severe arteriosclerosis.
Third, arterial embolism.
In Yan Feifan's earlier estimation, the difference in Mrs. Na's blood pressure was at least 15 mmHg.
Combined with Mrs. Na's symptoms, Yan Feifan judged with at least ninety percent certainty that she had a thoracoabdominal aortic dissection.
This condition is extrely critical.
If her aortic dissection were to rupture, it would cause massive internal bleeding in her thoracic and abdominal cavities, which could be fatal in an instant.
Seeing how serious Yan Feifan was, Mrs. Na grew scared. She stopped arguing and had a colleague drive her to the Affiliated Hospital...
After waiting for another ten-plus minutes, Zheng Libin finally returned to the office.
He pulled up a video, about three minutes long, on his office computer and asked Yan Feifan to watch it.
When he saw the video's content, Yan Feifan shot a look at Zheng Libin.
'This guy... he's really testing .'
The first person in the video was dressed from head to toe in riot gear, complete with a full-face helt.
The four people who appeared after him were all dressed in the sa attire.
Zheng Libin waited for Yan Feifan to finish the video, then explained, a bit embarrassed, "Mr. Yan, my apologies."
"My superior said the verification had to be rigorous, so the results would be irrefutable."
Yan Feifan smiled and said confidently, "That's how it should be. This way, the results will be convincing."
"Let's begin the identification."
Zheng Libin stood up, gestured for him to proceed, and said, "Mr. Yan, if you're ready, please follow ."
"They're on the small training ground in the courtyard right now..."
Yan Feifan followed Zheng Libin out of the office.
When they arrived at the Public Security Bureau's courtyard, Yan Feifan saw five police officers in riot gear standing in a neat line on the basketball court.
They were all of similar height, around 178 centiters, with comparable body types.
And they were all wearing full-face helts.
Beside these five, a dozen or so n and won in police uniforms or plain clothes were also standing there.
Evidently, these people had gathered either to watch the show or to witness the event firsthand.
Zheng Libin led Yan Feifan to the front of the line of five and said in a stern voice, "In a mont, I want you to walk exactly as you did when we fild the video."
"If anyone deliberately holds back or alters their movents, they'll be disciplined for violating work protocol."
"Do you understand?"
"Yes, sir!"
The five n's sudden, unified shout was so loud it made Yan Feifan's ears ring.
Zheng Libin nodded in satisfaction and turned to Yan Feifan. "Mr. Yan, from now on, they will follow your instructions."
"If you want one of them to step out and walk around, just point."
"If you want him to walk in a certain way, just give the order."
Yan Feifan glanced at the five n and said with a straight face, "Mr. Zheng, there's no need for all that trouble. Just have them all walk back and forth a few tis together."
Zheng Libin let out a soft "Oh," then looked at the five n and shouted, "Use the sa gait you used when we fild the video. Move around freely."
"Now... begin!"
At his command, the five n broke from their line and began walking back and forth within the confines of half the basketball court.
Yan Feifan watched for a mont, his brow furrowing involuntarily.
In his mind, he was capturing the most minute details of their gaits: the speed and height of their steps, the angle of their arm and hand swings, whether their heads tilted forward or swayed, the degree of their upper body's side-to-side and back-and-forth movent, the swing of their hips, and more.
He compared this information, one by one, with the gait characteristics of the n in the video he had just watched.
But...
Yan Feifan closed his eyes, concentrating all his effort on a deeper analysis.
Beside him, Zheng Libin was watching Yan Feifan intently.
He was aware of technology like gait analysis; just like facial and voice recognition, there was specialized analytical software for it.
It was just that the district's Public Security Bureau didn't have such software.
And as far as he knew, its reliability was far inferior to that of facial and voice analysis software.
Seeing Yan Feifan lost in thought, Zheng Libin felt conflicted. Part of him hoped this identification ability was real, while another part secretly hoped it wasn't.
If Yan Feifan proved his skills were genuine, it would an there was a problem with their previous investigation.
Lost in this conflict, Zheng Libin noticed Yan Feifan open his eyes and quickly composed himself.
"Mr. Yan..."
Yan Feifan said softly to Zheng Libin, "Have them stop."
"Alright, fall in!"
With a loud shout from Zheng Libin, the five n who had been walking around imdiately ford a line again in front of Yan Feifan.
Yan Feifan pointed to the first person from the right and said, directly and decisively, "You were the third person in the video."
Hearing this, Zheng Libin's expression didn't change.
He couldn't, after all, tell who was who among the five n before him.
To prevent Yan Feifan from identifying them by details on their clothes or shoes, all five had been given a complete change of clothing.
Zheng Libin would only be able to recognize them once they took off their helts.
Then, Yan Feifan pointed to the second person from the right. "You were the first person in the video."
Next, Yan Feifan's finger skipped over the third person and pointed to the fourth from the right. "You were the fourth person in the video!"
Yan Feifan pointed to the last man. "You were the second person in the video."
Finally, Yan Feifan pointed to the person in the middle he had skipped over and said with great certainty, "You weren't in the video. You were put here to confuse my judgnt."
As soon as he finished speaking, a middle-aged police officer who looked to be in his forties strode forward.
"Mr. Yan, hello. I am Yi Honggang, the director of the district bureau."
Yi Honggang introduced himself, sizing up Yan Feifan before nodding in praise. "Mr. Yan, you've truly opened my eyes."
"That's right. I had him swapped in at the last minute. Not even Mr. Zheng knew about it."
Yi Honggang then ordered the five n, "Take off your helts!"
Once they removed their helts, Yi Honggang looked at Zheng Libin and asked, "Was Mr. Yan's identification correct?"
Zheng Libin looked at the faces of the five n, took a deep breath, and reported, "Director, Mr. Yan's identification was flawless."
"I can guarantee that no one passed any information to Mr. Yan during this ti."
Yi Honggang grunted softly and said in a grave voice, "Mr. Zheng, Mr. Yan has proven to us with undeniable facts that his identification skills are credible."
"The rest is up to you."
Zheng Libin snapped to attention and said, "Rest assured, Director. This ti, we will leave no stone unturned. There will be no more oversights or doubts..."
Yan Feifan returned to the Affiliated Hospital in a police car.
Just as he got out of the car, he received a call from Mr. Yi.
"Mr. Yan, I just received confirmation. Mrs. Shang Na has just been diagnosed at the Affiliated Hospital with an abdominal aortic dissection."
"The ergency specialists say her condition is extrely critical. If the dissection ruptures, her chances of survival are nonexistent."
"Right now, Shang Na is being prepped for surgery."
"Mr. Yan, on behalf of the district bureau, I want to thank you again..."
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