Tumescent Liposuction and Sedation Anesthesia

In this article, I will explain how tumescent local anesthesia prevents pain during liposuction, what improves when sedation anesthesia (sedation) is added to it, and why sedation must be managed carefully.

Tumescent liposuction is a method in which a dilute solution containing a local anesthetic and a vasoconstrictor is infused generously into the fat layer, making the fat layer firm and swollen before suction. As the solution spreads through the entire fat layer, it numbs the nerves in that area and narrows the blood vessels to reduce bleeding [1]. So in tumescent liposuction, it is the solution that takes on the job of preventing pain.

A. Tumescent Infiltration — Infusion of the solution begins at the deepest part of the fat layer. B. Progressing — As the solution spreads between fat cells, the shallower layers are filled with less discomfort on top of the deep layers that have already been numbed. C. Full Tumescence — The entire fat layer is filled with solution and is firmly swollen, so the anesthetic and vasoconstrictive effects reach the whole fat layer. D. Detumescence — The stage in which the solution spreads into the surrounding tissue and the swollen fat layer partly settles [1].

That presentation begins with the words of Klein, the originator of tumescent liposuction: the excellence of liposuction is ultimately judged by patient satisfaction, and that satisfaction depends on safety, comfort, and the quality of the result [4]. Sedation adds "comfort" among these, but it must be accompanied by management that protects "safety."

Medically, sedation anesthesia is called sedation, and it means lowering the level of consciousness with medication. Its depth is not a single point but a continuum, divided into conscious (moderate) sedation, in which the patient responds to voice or light stimulation; deep sedation, in which the patient responds to painful stimulation; and general anesthesia, in which the patient does not respond even to pain [2][6].

This distinction matters because of the airway. Under conscious sedation, the "protective reflexes" — keeping the airway open, swallowing, coughing, and breathing on one's own — are maintained by the patient [2]. Liposuction is mostly performed between conscious sedation and deep sedation, and within this range most patients breathe well on their own. However, if sedation deepens to the level of general anesthesia, it becomes difficult for patients to protect their own airway, and a device to secure the airway becomes necessary [6]. Because the level of consciousness rises and falls during sedation, it must be watched continuously so that it does not cross into that stage [6].

Dr. Jung's research manuscript explains that tumescent local anesthesia alone often cannot provide complete anesthesia, so the patient's anxiety and pain may make it difficult to remove as much fat as needed. For this reason, it notes that intravenous sedation using propofol, midazolam, and ketamine, alone or in combination, is increasingly used for liposuction performed in clinics [4]. All three are sedative drugs that lower the level of consciousness so the patient can sleep comfortably, but their properties and precautions differ somewhat.

Because propofol does not erase memory, a small amount of midazolam is sometimes used with it [2], and the dream and hallucination reactions of ketamine are also reduced when midazolam is used together [2]. In this way, several drugs are adjusted little by little according to the patient's condition and the extent of the surgery, and using a fixed combination as-is is not recommended [2]. No matter which drug is used or who gives it, the level of monitoring must be equally thorough [2].

A pulse oximeter clipped onto the finger continuously shows the pulse and the amount of oxygen in the blood [5]. A drop in oxygen saturation is a sign that the airway has narrowed or breathing has weakened, so we check right away. Textbooks explain that oxygen should be supplied during recovery after surgery as well, and the patient should be observed until oxygen saturation stays at 90% or higher on room air [2].

We also supply oxygen. At Venus Clinic, we supply oxygen through an oxygen mask throughout sedation, even at the conscious sedation stage. Supplementing oxygen helps maintain oxygen saturation even when the surgery runs long, which in turn helps the surgery proceed steadily. Lecture materials also state that oxygen supply equipment should be in place before sedation begins, and that if breathing weakens, the airway should be checked and oxygen supplied [5].

The most important principle of sedation is continuous monitoring. During sedation, the level of consciousness rises and falls [6], and sedative drugs can affect blood pressure and breathing, so a check at any single moment is not enough. Textbooks explain that when sedative drugs are added to local anesthesia, monitoring must include assessment of the vital signs — blood pressure, pulse, and oxygen saturation — together with the level of consciousness [2], and that if there is no separate anesthesiologist, there must be separate designated personnel responsible for this monitoring [2]. Because liposuction can easily take more than two hours, they warn that performing intravenous sedation without someone dedicated to watching the patient and without being ready to support heart and lung function immediately is imprudent [3].

Liposuction can easily take more than two hours, and textbooks warn that the longer the surgery, the more dangerous loosely managed sedation becomes for the patient [3]. Dr. Jung's presentation also cited reports that serious complications such as blood clots may increase when operating time exceeds 2 hours or blood loss exceeds 500 mL, emphasizing the importance of reducing operating time; and in an analysis of 49 patients who underwent tumescent liposuction under sedation, blood loss was related to operating time rather than age, body weight, or the amount aspirated [4]. Managing sedation carefully and finishing the surgery accurately within the planned time are not separate matters. However, when a wide area such as the entire thigh and the buttocks is operated on together, the surgery may exceed 2 hours, and the more it does, the more important sedation management becomes — continuously watching vital signs and the level of consciousness throughout the surgery. The before-and-after photos below show such a case.

For 20 years, Venus Clinic has performed tumescent liposuction together with sedation and has managed it steadily. Letting the tumescent solution prevent pain, using sedation only as much as it adds comfort, and continuously watching the airway, the depth of sedation, and oxygen saturation during surgery are the principles we have kept.

All anesthesia and surgery carry risks, and sedation is no exception. Precautions differ depending on your health, the medications you take, and previous experiences with anesthesia, so please be sure to tell us about them at your pre-surgery consultation. In particular, older patients and those with medical conditions such as heart, lung, or liver disease need to be even more careful when choosing sedation. Textbooks also explain that the dose of sedative drugs varies with age and health [2], and that for long or complex surgeries or for high-risk patients, it is desirable to have medical staff dedicated to anesthesia [2]. Also, sedation is not mandatory but optional, so if you would like to have surgery with tumescent local anesthesia alone, you may do so [6].

The patient below had thigh and buttock surgery with tumescent liposuction under sedation at Venus Clinic, and we show front, left-side, and back photos of the same person in order. Because the surgical area was large, the operation took more than 2 hours, making it a case where sedation management was especially important. All after photos were taken at the follow-up visit 1 week after surgery. Swelling and bruising still remain at this stage, so this is not the final result.

This is a case in which the thighs and buttocks were operated on together. Tumescent liposuction under sedation was performed circumferentially around the entire thigh, together with the buttocks. The operating time was 156 minutes, exceeding 2 hours, and the amount of pure fat aspirated was 2,600cc. A surgery with such a wide area and large aspiration volume takes longer, so it is a case where sedation must be managed even more carefully, with continuous monitoring of vital signs and the level of consciousness from start to finish. In the photos taken at the follow-up visit 1 week after surgery, you can see a reduction in thigh circumference from the front, in the thickness of the back of the thighs and the buttocks from the side, and in the outer thigh line from the back. Bruising and swelling still remain at this stage, and the lines become more refined as the swelling subsides.

In tumescent liposuction, the solution prevents pain, and sedation adds comfort on top of it. However, that comfort serves its purpose only when sedation is managed carefully, with continuous attention to the airway, the depth of sedation, and oxygen saturation. Venus Clinic will continue to keep these principles in managing sedation.

References: Liposuction Surgery and Sedation Anesthesia What Is Tumescent Liposuction? Sagging Breast Case Review