The human heart muscle is the most special group of muscles. Modern medicine roughly divides cardiomyocytes into two types, "working cells" and "autonomic cells", according to their different functions. Autonomic cells are responsible for conducting signals that guide working cells to contract and relax. Working cells, on the other hand, are responsible for squeezing blood from the heart throughout the body.

As the most "model worker" cell, cardiomyocytes are, of course, available all year round. According to a normal adult's heart rate of about 80 beats per minute, a person's heart needs to beat at least 1.3 billion times in the 32 years from 18 to 60 years old. Such high-intensity work means that the heart muscle needs to consume a lot of nutrients and oxygen. In order to supply the heart muscle, mammalian hearts have evolved such things as "coronary arteries".

Supplied by the coronary arteries, the capillaries release oxygen and nutrients to the heart muscle, and finally through the coronary venous sinuses or precordial veins, where blood is re-infused into the circulatory system. This process is called the coronary cycle, and the importance of this cycle is self-evident – it acts as a power supply for the operation of a nuclear power plant, like a core reactant that starts and sustains the entire industrial chemical reaction process. Without it, the heart would not be able to work.

There are two coronary arteries in the human heart, and more than 65% of people fall into the left coronary dominant category, where their hearts rely mainly on the three branches of the left coronary artery to transport arterial blood. Twenty-nine percent of people are in a balanced shape, and their left and right coronary arteries deliver the same or similar amount of arterial blood. The remaining 6% are the rare right coronary dominant type, where the five branches of the right coronary artery carry most of the blood the heart needs.

Although I don't know what type Wu Fenmei is, the meaning of left coronary artery occlusion (2/3) has been obvious. She has only one left coronary artery left, and according to rough statistics, she has about a 94% chance of having a heart attack. It is not clear whether it is severe myocardial infarction and ventricular fibrillation or severe pain caused by mild myocardial insufficiency.

Sun Lien knew in his heart that with his current situation, once Wu Fenmei became ill, it would be almost impossible for him to carry out effective rescue - CPR is an authentic heavy physical work, and Sun Lien, who was almost suffocated with a mask, could not urge his body to press down forcefully to form effective chest compressions. In ventricular fibrillation, CPR and defibrillation must be used together to reverse the ventricular fibrillation. Relying only on electric shocks and the Saab machine, commonly known as a "pile driver", will have very limited effect.

The senior doctor must be notified immediately and invited to come to the town......

"Director Liu, Teacher Liu!" Sun Lien turned his head and walked to the isolation door, "The patient has a little problem, it may be a heart attack!"

God knows how Sun Lien moved his legs to the door. He could barely feel his legs. He reluctantly put the oxygen tube under his mask and took two puffs with all his strength. Although the oxygen tube is sprayed with pure oxygen, after all, through the mask, the effect of oxygen inhalation is basically the same as that of a placebo.

"Director Liu, you have to ......hurry up" Sun Lien clenched his fists and slammed the door twice, "I must not be able to do CPR in my current state...... Before he finished speaking, a sharp alarm suddenly sounded from the hospital bed behind him.

"It's ventricular fibrillation!" Sun Lien put down the last sentence, turned off the oxygen switch, and moved briskly to the side of the hospital bed—this was already his fastest speed.

Liu Tangchun is wearing a protective suit with a straightening hand that is completely out of step with his age. But the P4-level protective clothing is too troublesome, even if Liu Tangchun can't even divide the energy to scold, he still needs some time to put it on.

Hu Jia grabbed Sun Lien's mobile phone worriedly.

"Defibrillation!" Wu Fenmei had already connected to the high-level airway, and Sun Lien didn't need to devote extra energy to pay attention to her breathing state. He smeared some conductive gel on the defibrillation electrode plate, and Sun Lien skillfully placed the electric shock plate in the designated position. "First electric shock, 240 joules, electric shock!"

"Boom!" There was a soft sound, and Wu Fenmei's body bounced up and down. All the data on the cardiopulmonary monitor becomes a straight line. Then the new data was refreshed, and her heart was still in a state of ventricular fibrillation.

"Fuck you. Sun Lien scolded in a low voice, not knowing whether he was cursing this damn disease, or cursing God who had made him so unlucky.

What are you going to do next? Sun Lien was in a slight trance. The sluggishness of his thinking caused by the lack of oxygen supply once again hindered him from making judgments as quickly as possible.

Lying in front of him was a stranger. I know her name, I know her condition, I know her age...... Sun Lien was suddenly stunned.

Wu Fenmei was still 57 years old last night, but now she ...... The status bar says she's 58 years old.

Today is Wu Fenmei's birthday.

Sun Lien was in a trance, as if he heard her voice. She was begging for her help. She wanted to keep living.

Lying in front of him was a stranger, a sick person, a life.

Who am I?

I'm Sun Lien, and I'm a doctor who has just started training.

My uncle and second uncle used to be doctors, and it used to be my dream to stand side by side with them in white coats.

They're dead. In order to fulfill their vows, in order to save lives, in order to ...... Let the sick live.

I'm also a doctor.

I'm going to do something.

I had to do something.

Sun Lien stood up straight, his mind still sluggish, his movements still slow. But he felt as if a stream of heat was spreading from his chest to his limbs. He threw down the electric shock plate in his hand with all his might, and began to press Wu Fenmei's chest hard.

"01,02,03,04......" The amplitude of the two-handed pressure must be such that the patient's chest sinks by about three centimeters. As soon as he pressed it for the fourth time, Sun Lien felt a strong dizziness coming. He could barely stand.

"Fuck you. Sun Lien scolded for the second time. "Fuck you!"

The swearing didn't do anything to the vertigo, and he felt a dull pain in his chest. All the tissues of the body are screaming for more oxygen.

Sun Lien ripped off the mask covering his face.

"Second defibrillation!" he was finally able to breathe. Tiredness and sluggishness seemed to be removed from his body in an instant. "270 joules, electric shock!"

Hu Jia, who was outside the door, was holding Sun Lien's mobile phone tightly, and his hands turned pale from excessive force. As if he was holding Sun Lien's hand. She clenched her hands vigorously, as if to convey her worries and anxieties to him, who was resuscitating patients in the clean room.

"There was no heartbeat. There is no need to confirm again, Sun Lien also knows that Wu Fenmei is not getting better. The status bar reads, "Ventricular fibrillation (2/11 of a day before defibrillation is successfully lifted)." ”

Defibrillation requires five chest compression cycles, while one cycle is 30 chest compressions.

The frequency of chest compressions is 150 times per minute, which is exactly enough for one minute. The next defibrillation can be performed.

"Third defibrillation, 270 joules, electric shock!" Sun Lien's sweat shook off his forehead. He raised his heavy arms and defibrillated Wu Fenmei again.

Compressions, defibrillation, compressions, defibrillation. Sun Lien was busy in the clean room, and he didn't notice that Liu Tangchun, who was wearing protective clothing, had already walked into the clean room.

"Sixth defibrillation......" Sun Lien only felt that his mouth was a little dry. I'm alone in the clean room, and who are these passwords to hear? Anyway, I'm in the room, and it seems that the warnings before defibrillation have become a little meaningless.

"It's okay...... Liu Tangchun said in a deep voice, "You did your best." ”

"Seventh defibrillation!" Sun Lien completely ignored Liu Tangchun behind him. Four more times, just four defibrillations!

"You're doing a great job. She...... Now it's not like you're doing anything wrong. Liu Tangchun has seen a lot of young medical workers fall into the mood of the moment. They are young and full of energy. But in the face of death, no matter how energetic they are, nothing will help. No one can stand against death.

"I didn't do anything wrong, but she's dying. Sun Lien gasped and finished the eighth defibrillation. "How could I have this outcome, how could it ......" he couldn't go on.

Liu Tangchun looked at Sun Lien sympathetically, "We used to have an old saying, 'Medicine and medicine do not die of disease, and Buddha is destined for people'." This is an objective fact, we can try to change, but when the attempt does not work as it should, you have to learn to respect the situation and learn to respect life. ”

"The ninth!" Sun Lien's sweat had completely wet his clothes and the white coat on his body. The whole person was as if he had just been fished out of the water. He was still continuing to repeat chest compressions, "Who...... Who said...... This attempt didn't work?"

Liu Tangchun glanced at the cardiopulmonary monitor, "Chest compressions have been more than 10 minutes." The chances of her waking up are low, and even if she does, she may have severe brain damage......"

"That kind of thing is left to the extra-divine doctor to worry about. Sun Lien completed the tenth defibrillation. He could barely stand, his legs as weak as noodles. In order to ensure that he did not fall to the ground, Sun Lien even simply leaned his body on the hospital bed. "I'm an emergency doctor. ”

"I, yes, emergency, doctor. In doing this, Sun Lien is still able to maintain the quality and frequency of chest compressions. I don't know if this is because of the results of his short football career, or if the concept of "fatigue" has been forgotten by his brain. "My job is to save their lives...... "Breathing began to get harder. It is as if the lungs have lost their ability to intercept oxygen from the air. The blood flowing in the veins must have turned into carbonic acid, right?

Sun Lien was a little surprised that he could still think of a cold joke that was not very funny.

"Eleventh defibrillation, 320 joules!" Sun Lien did his job. He didn't even have time to look at the cardiopulmonary monitor to see if Wu Fenmei's heartbeat had restored sinus rhythm. With her last tremor, Sun Lien fell straight backwards like a robot that had been unplugged.

Then it fell into darkness.

It was as if he heard a commotion.

"Recovered, sinus ......" "Stretcher bed!" "Lien!" "Stop her!" "Nurse!"

These voices could no longer give Sun Lien any more ideas.

He seemed to vaguely see two figures, two figures wearing white coats and masks.

m.