Patel Bhupendra C., Malhotra Raman
University of Utah
Many medical conditions rely upon strict numerical definitions to provide a diagnosis; diabetes mellitus and hyperlipidemia are two examples. In the case of brow ptosis, diagnosis is determined predominantly by the judgment and experience of the examining physician. Brow ptosis exists when inferior malposition of the brow interferes with aesthetics or function. The brow level deemed low in one person may be perfectly acceptable or "normal" in another. With the brow being a mobile structure and prone to the secondary effects of age, solar elastosis, muscle action, trauma, and gravity, some degree of brow descent will eventually occur in everyone. Ideal brow position is regarded differently in different genders, races, ages, and even generations. In some communities, the concept of changing the brow's position or shape is considered anathema; in many Western societies, however, it is considered routine. The classic teaching describes the ideal female brow position as above the level of the bony supraorbital rim, with an upward arch such that the peak of the brow lies between the lateral limbus and the lateral canthus. In men, the eyebrows normally sit at or just above the superior orbital rim, with a flatter contour. Age, cultural influences, occupations, and environmental effects all influence not only brow position and shape but also perceptions of what is aesthetically pleasing. A weather-worn farmer, for example, may have an inferiorly-positioned brow that provides some protection from light, dust, and wind. On the other hand, a model may require a higher brow position in order to appear more youthful or attractive, regardless of gender. Subtle changes in brow shape are also indicators of emotional state: low lateral eyebrows denote sadness or concern, low medial brows indicate anger, flat or low brows may display fatigue, and excessively elevated brows appear surprised. Similarly, temporal hooding and upper eyelid dermatochalasis may indicate tiredness, but when combined with frontalis overactivation because of the heavy upper eyelids, the impression of fatigue is multiplied. Finding the precise balance to portray happiness and vitality can be challenging. If upper blepharoplasty and blepharoptosis repair take place without addressing brow ptosis, the brows will appear lower after surgery because the frontalis tone is diminished once the visual fields are improved, thus also exacerbating a fatigued appearance. When brow ptosis is present, it is rarely completely symmetrical, because of myriad factors, including differences between the right and left sides of the face (hemifacial microsomia or facial paralysis), differential exposure to the elements (particularly for those who drive with a lowered window), the preferred side a patient may sleep on, and many others all affect brow position. Aging. Facial palsy. Trauma. Tumors. Cosmetic complaints. Visual obstruction caused by secondary dermatochalasis and pseudoptosis. Asymmetric brow position. Irritation caused by secondary eyelash ptosis. In the absence of trauma, paralysis, or disease, brow ptosis occurs slowly, and most patients will not be aware of the brow ptosis until it is noted during a clinical examination or remarked upon by an acquaintance. Almost everyone over the age of 40 years, male or female, will have some degree of brow ptosis, and most of these patients will not require surgical correction. Direct brow lift. Mid-forehead brow lift. Pretrichial brow lift. Temporal brow lift. Coronal brow lift. Endoscopic brow lift. Internal (transblepharoplasty) brow lift . This article reviews the assessment and planning of brow lifts, in general, and indications and techniques for the mid-forehead lift, in particular. Many surgical procedures, such as cranial trephination, nasal reconstruction, and skin grafting, have been performed for hundreds of years, and some, like cataract surgery, thousands of years. Surprisingly, brow lift surgery was only reported in the 20th century when Lexer first discussed and presented the forehead lift in 1910. Subsequently, an early coronal brow lift was described by Hunt, who did not undermine any of the tissues, thus limiting results. Joseph, in 1931, presented a detailed description of the pretrichial brow lift as well as incisions made lower on the forehead to augment the brow elevation. Many surgeons continued the practice of simple tissue resection until Passot reported selective neurotomy of the frontal branch of the facial nerve in 1933. This method diminished forehead wrinkles; however, the resting tone of the frontalis muscle was lost, and this was clearly counterproductive for brow ptosis. For reasons not entirely clear, surgeons continued to explore the idea of forehead motor denervation. Edwards reported isolated temporal neurectomy as recently as 1957. A more anatomical approach was advanced by Bames that same year when he described a direct eyebrow lift. Through this approach, he weakened the corrugator muscles and undermined the forehead up to the hairline while crosshatching the frontalis muscle. Modern hairline and coronal approaches to the forehead lift and brow lift were ushered in by Pangman and Wallace in 1961. Further refinement occurred in 1962 when Gonzalez-Ulloa incorporated the forehead lift into his facelift procedure. Despite the initial enthusiasm for coronal lifting, reports in the 1960s and 1970s suggested that results of coronal forehead lifts were short-lived, which led to the procedure losing favor. It remained unrecognized that the results were bound to be temporary without undermining after excision of excess soft tissue. Until the early 1970s, most surgical procedures consisted of resection and repair without undermining or manipulating the forehead muscles; the anatomy and physiology of the forehead had not yet been adequately appreciated. A significant advance occurred in the mid-1970s when several surgeons (Skoog, Vinas, Hinderer, Griffiths, Marino, and others) began to manipulate the frontalis muscle, usually by excising a strip to eliminate dynamic transverse lines on the forehead. This technique also allowed better stretching of the superficial tissues. Washio was one of the first to carry out cadaver studies when he noted in 1975 that removal of a transverse section of the frontalis muscle resulted in a significant elevation of the forehead. More dramatic approaches by Tessier, LeRoux, and Jones advocated the complete removal of the frontalis muscle. Not surprisingly, this aggressively destructive approach did not endure. In the 1980s and 1990s, the coronal brow lift became the established method of brow lifting; this was partly because of the advances made by Tessier and his group in the exposure of the skull via subperiosteal approaches. It was said, not entirely in jest, that the coronal brow lift, with its associated loss of hair and sensation, and the overly tight appearing forehead and brow was "a surgical procedure designed by men for use on women." In the 1990s, endoscopic approaches to brow lifts were developed. After the evolution of fixation techniques, it became apparent that in "brow lifting," brow shaping was at least as important, if not more so. Repositioning of the brows and forehead could be controlled with release of the periosteum from the lateral canthus to the lateral canthus across the superior orbital rims and the nasal bridge, combined with manipulation of the depressor and elevator muscles of the brows. Anatomical details were studied in order to design safe approaches that could be performed using minimal incision techniques. Understanding the sensory and motor innervation of the forehead and periorbital area allowed more accurate manipulation and modification of the tissues and permitted less invasive but also more effective techniques, such as the pretrichial and temporal brow lifts. After some debate about the longevity and effectiveness of endoscopic brow lifts compared to coronal brow lifts, there are now two schools: one school still largely performs coronal brow lifts. However, more and more surgeons are becoming experts at performing endoscopic brow lifts. When patients are chosen correctly, these endoscopic brow lifts provide reliable and long-lasting results. Coronal brow lifts, pretrichial brow lifts, mid-forehead brow lifts, direct brow lifts, and temporal brow lifts are now more often performed for specific indications. The so-called internal brow lift, or transblepharoplasty browpexy, should perhaps be called a "supporting procedure" rather than a proper "brow lift." No long-term studies show effective brow lifting, and the design of the procedure does not address the complete arch of the brow nor the forehead. Similar to many others, the mid-forehead lift procedure has specific indications, advantages, and limitations. This approach is most useful in males with heavy brows, overactive frontalis muscles, and deep, transverse forehead wrinkles that may hide a surgical scar. Common refrains encountered in plastic surgery are "I am becoming my mother" and "I look like my dad." The patient is saying that family characteristics, both physical structure and response to aging, are becoming apparent. Everyone has an "aging clock," which is genetically determined, but skin and deeper tissues are also affected by environmental factors such as smoking, exposure to ultraviolet light, health, and diet, among others. It can help to examine photographs of the patients when they were younger and photographs of their parents to provide patients with some context for these changes. Aging affects nearly every structure in the face, and it is certainly the most common cause of brow ptosis. Patients routinely exposed to the elements will show marked overaction of the corrugator, procerus, and frontalis muscles, especially if they have not protected their eyes from sunlight and other harsh environmental factors. The "weathered face" seen in sailors and farmers show these changes well, not just in the region of the forehead and the brows but also in the lower face and neck. These patients develop horizontal rhytides at the root of the nose, caused by procerus muscle contraction and marked corrugator lines, which are the vertical "number elevens;" the eyebrow heads may also appear closer together because of hypertonicity of the corrugator muscles. In these cases, surgeons may make an effort to elevate and separate the brow heads - an action that would often be avoided otherwise because of the operated appearance it can produce. When brow ptosis is moderate to severe, deep horizontal forehead lines may also appear due to frontalis muscle overuse. Some patients with notable glabellar muscle hyperactivity may develop a "fat nose syndrome" caused by the downward slide of the procerus muscle and the inward movement of the corrugator muscles. This results, especially in females, in a widened root of the nose. These patients benefit significantly from disruption of the procerus and corrugator muscles during brow lifting. It may be helpful to compare current pictures of the patient with photographs taken when the patient was younger to assess the degree to which the brow position and contour have changed. Sometimes patients are surprised to see that their brows have changed very little since their teenage years. Regardless, while young patients may look attractive with brows in either a high or a low position because many visual cues exude youth, older patients typically look better with somewhat higher brows. Besides the glabellar impact of aging, lateral brow droop almost always progresses over time because of a lack of support from the frontalis muscle. The angle of insertion between the frontalis and the orbicularis oculi muscles becomes more acute with age, thereby leading to further loss of support laterally; this results in temporal hooding, lash ptosis, temporal brow droop, and crow's feet wrinkles. Presentation of brow ptosis ranges from cosmetic complaints of forehead lines and secondary heaviness, or hooding, of the upper eyelids to unattractive frown lines and problems with vision. Cosmetic patients will primarily focus on upper eyelid heaviness and fullness; other complaints may include "looking tired, angry or unhappy" either from the patient or family members and colleagues. Patients will only rarely complain that their brows are heavy or droopy in the absence of other concerns and will usually need to have brow malposition demonstrated to them in the mirror. A thorough preoperative assessment is vital. Past illnesses, medications, allergies, and any history of hypertrophic or keloid scarring are noted. Specific emphasis is placed upon any history of thyroid disease, diabetes, cigarette smoking, anticoagulation use, prior eyelid or brow surgery, and any tendency to develop unusual edema. Patients with thyroid disease may have deeper frown lines and may suffer from madarosis (loss) of the brow hairs. These patients also tend to develop prolonged edema after facial surgery. Thyroid disease must be controlled and stable, ideally for at least six months, prior to scheduling surgery. Regardless of the nature of the chief complaint, if it pertains to facial aging, a complete facial examination is critical. Patients will often present with vague concerns that relate to the appearance of aging, fatigue, or poor mood; many will ask, "what do you think?" or "what can you do for me, Doctor?" The ability to pinpoint specific problem areas and identify corresponding surgical targets is crucial; counseling patients after completing a thorough physical examination will be immensely informative for them and facilitate the development of realistic goals and expectations. As a general rule, the face should be assessed for asymmetry between the left and right sides, as hemifacial microsomia can have a profound impact on surgical outcomes, and then the proportions of the upper, middle and lower thirds of the face should be examined. Lastly, the skin color and quality of every potential cosmetic patient should be evaluated as well. This algorithmic approach to facial analysis will help prevent overlooking any major abnormalities and focus the surgeon's and patient's attention on the available treatment options, which may or may not relate directly to the chief complaint, or the patient's original self-perception. Assess the hairline and forehead height relative to gender and ethnic norms. Assess the density and distribution of scalp hair centrally and temporally. Measure the height of the forehead: the distance between the corneal reflex and the anterior hairline or the distance between the central brow and the anterior hairline. Measure brow position: the brow can be measured relative to the superior orbital rim or measured from the lid margin to the brow or from the corneal reflex to the brow centrally and from the medial and lateral limbi to the medial and lateral brow. Others use the medial and lateral canthi as reference points and compare the left and right brow positions. Assess brow shape and symmetry. Assess eyebrow hair distribution: evidence of plucking, loss, tattooing, etc. Assess eyebrow mobility. Measure the degree of true dermatochalasis, as opposed to secondary dermatochalasis caused by brow ptosis - manually lift the brow into the desired position to do this. Assess the medial and central superior orbital fat pads and any lacrimal gland prolapse. Assess the distribution and depth of the forehead and glabellar rhytides. Assess corrugator and procerus lines. Assess crow's feet. Evaluate for blepharoptosis. Assess skin thickness and quality, noting how sebaceous the glabellar skin appears. A basic lower eyelid assessment should be performed when considering brow or upper eyelid surgery. When documenting brow ptosis, one reproducible measurement is the distance between the inferior limbus and the center of the brow. In most patients, this distance will be more than 22 mm. Although a measurement of less than 22 mm suggests brow ptosis, the formal diagnosis will depend upon the many other factors discussed above: age, gender, occupation, and societal expectations, among others. Ideal brow position is best determined on an individual basis by the surgeon and patient, taking into account the surgeon's experience, the patient's current and previous youthful appearance, and the specific aesthetic goals. Measuring with a ruler on an upright patient, the brow is elevated medially, centrally, and laterally to assess the degree of brow ptosis. The difference between the desired brow position and the relaxed brow position indicates the degree of brow ptosis. It is critical for patients to relax the frontalis muscle before taking measurements; this may be accomplished by first having the patient close their eyes, then gently massaging the brow and forehead downward into their natural positions. From there, the patient can gently open their eyes, taking care not to engage the frontalis muscle. Occasionally, multiple attempts are required, and even with this method, reliably reproducible results can be elusive. Measurements will often reveal brow position asymmetry, and this should be indicated to the patient preoperatively using a mirror to forestall postoperative suggestions that any asymmetry is iatrogenic. Although discussions concentrate on the brow and the brow height and contour, surgeons must not forget that the characteristics of the forehead are equally important; the severity of glabellar, corrugator, and frontalis lines, as well as skin quality should all be documented. The distance between the brow and the anterior hairline should be measured because, in some patients, hairline advancement may be desirable, which will inform the choice of brow lift approach. Upper and lower eyelid assessment is important even for patients focused on brow lifting. The forehead, brow, and periorbital region are contiguous, and procedures performed on the brow will inevitably affect the upper eyelids, which will, in turn, influence the appearance of the lower eyelids. While some procedures directly involve both the upper and lower lids, such as canthoplasty, in many cases, the rejuvenation of the brows and upper eyelids in the absence of lower blepharoplasty will leave the inferior periorbital area looking more aged simply by contrast. Assessment of the upper eyelids may include the following: Corneal reflex to lid margin distance. Presence and position of the upper eyelid supratarsal skin crease. Amount of tarsal platform show. Degree of dermatochalasis: primary and secondary. Upper eyelid fat herniation, medial and central. Presence and degree of lacrimal gland prominence. Upper eyelid skin quality: solar elastosis, vertical wrinkles, visible blood vessels, etc. Bell's phenomenon. Blink completeness. Assessment of the lower eyelids may include the following: Medial canthus: position, laxity, dystopia, scarring, webbing. Lateral canthus: position, dystopia, laxity, scarring, webbing. Lower eyelid distraction test. Lower eyelid snapback test. Inferior scleral show. The prominence of medial, central, and lateral fat pads. Nasojugal and malar groove depth. Malar angle. Tear film integrity and tear breakup time. Corneal sensation and health. Hertel measurement of the globe to assess for proptosis or enophthalmos.
许多医学病症依靠严格的数值定义来进行诊断;糖尿病和高脂血症就是两个例子。而在眉下垂的情况中,诊断主要取决于检查医生的判断和经验。当眉的位置过低影响美观或功能时,即为眉下垂。在一个人眼中被认为较低的眉水平,在另一个人眼中可能完全可以接受或属于“正常”。由于眉是一个可活动的结构,且容易受到年龄、日光性弹力组织变性、肌肉活动、创伤和重力等因素的影响,每个人最终都会出现一定程度的眉下垂。理想的眉位置在不同性别、种族、年龄甚至代际中都有不同的看法。在一些群体中,改变眉的位置或形状的观念被视为令人厌恶的;然而,在许多西方社会,这被认为是常规操作。经典的理论描述理想的女性眉位置应高于眶上缘骨水平,呈向上的拱形,使得眉峰位于外眦角和外眦之间。男性的眉毛通常位于眶上缘或略高于眶上缘,轮廓较为平缓。年龄、文化影响、职业和环境因素不仅会影响眉的位置和形状,还会影响人们对美观的认知。例如,一位饱经风霜的农民可能眉位置较低,这能为其提供一定程度的防晒、防尘和防风保护。另一方面,无论性别如何,模特可能需要更高的眉位置才能显得更年轻或更有吸引力。眉形状的细微变化也是情绪状态的指标:外侧眉低表示悲伤或担忧,内侧眉低表示愤怒,扁平或低眉可能显示疲劳,而过度上扬的眉则显得惊讶。同样,颞部皮肤松弛和上睑皮肤松弛可能表明疲劳,但当由于上睑沉重导致额肌过度活动时,疲劳感会加倍。找到描绘幸福和活力的精确平衡点可能具有挑战性。如果在进行上睑成形术和上睑下垂修复时未处理眉下垂问题,术后眉会显得更低,因为一旦视野改善,额肌张力会减弱,从而也会加剧疲劳的外观。当存在眉下垂时,由于多种因素,包括面部左右两侧的差异(半侧颜面短小畸形或面瘫)、暴露于外界因素的差异(特别是对于那些开车时车窗降下的人)、患者偏好的睡眠侧以及许多其他因素都会影响眉的位置,所以眉下垂很少完全对称。衰老、面瘫、创伤、肿瘤、美容方面的诉求、继发性皮肤松弛和假性上睑下垂引起的视觉障碍、不对称的眉位置、继发性睫毛下垂引起的刺激。在没有创伤、麻痹或疾病的情况下,眉下垂发展缓慢,大多数患者直到在临床检查中被注意到或被熟人提及才会意识到眉下垂。几乎每个40岁以上的人,无论男女,都会有一定程度的眉下垂,而且这些患者中的大多数不需要手术矫正。直接眉提升术、额中部眉提升术、额前眉提升术、颞部眉提升术、冠状眉提升术、内镜眉提升术、内路(经睑成形术)眉提升术。本文综述了眉提升术的评估和规划,特别是额中部眉提升术的适应证和技术。许多外科手术,如颅骨环锯术、鼻再造术和皮肤移植术,已经进行了数百年,有些手术,如白内障手术,则已经进行了数千年。令人惊讶的是,眉提升手术直到20世纪才被报道,当时Lexer于1910年首次讨论并介绍了额部提升术。随后,Hunt描述了早期的冠状眉提升术,但他没有破坏任何组织,因此效果有限。Joseph在1931年详细描述了额前眉提升术以及在额部较低位置做切口以增加眉提升高度的方法。许多外科医生继续采用简单的组织切除方法,直到1933年Passot报道了对面神经额支进行选择性神经切断术。这种方法减少了额部皱纹;然而,额肌的静息张力丧失了,这显然对眉下垂没有帮助。由于不完全清楚的原因,外科医生继续探索额部运动去神经支配的想法。直到1957年,Edwards还报道了孤立的颞部神经切除术。同年,Bames提出了一种更具解剖学方法,他描述了直接眉提升术。通过这种方法,他削弱了皱眉肌,并在发际线处向上剥离额部组织,同时对额肌进行交叉划开。1961年,Pangman和Wallace引入了现代发际线和冠状额部提升术及眉提升术的方法。1962年,Gonzalez-Ulloa将额部提升术纳入他的面部提升手术中,使其进一步完善。尽管最初对冠状提升术充满热情,但在20世纪60年代和70年代的报道表明,冠状额部提升术的效果是短暂的,这导致该手术失宠。人们没有认识到在切除多余软组织后,如果不进行剥离,结果必然是暂时的。直到20世纪70年代初,大多数外科手术包括切除和修复,而不剥离或操作额部肌肉;当时人们对额部的解剖和生理还没有充分的认识。20世纪70年代中期出现了重大进展,几位外科医生(Skoog、Vinas、Hinderer、Griffiths、Marino等人)开始操作额肌,通常是切除一条肌肉以消除额部的动态横纹。这种技术也使浅表组织得到更好的拉伸。1975年,Washio是最早进行尸体研究的人之一,他发现切除额肌的横向部分会导致额部显著抬高。Tessier、LeRoux和Jones更激进的方法主张完全切除额肌。不出所料,这种极具破坏性的方法没有持续下去。在20世纪80年代和90年代,冠状眉提升术成为既定的眉提升方法;这部分是因为Tessier及其团队在通过骨膜下方法暴露颅骨方面取得的进展。有人半开玩笑地说,冠状眉提升术伴随着头发脱落和感觉丧失,以及额头和眉看起来过于紧绷,是“一种由男性设计用于女性的外科手术”。在20世纪90年代,内镜眉提升术得到了发展。随着固定技术的发展,很明显在“眉提升”中,眉形塑造至少同样重要,如果不是更重要的话。通过从外眦角到外眦角横跨眶上缘和鼻梁释放骨膜,并结合操作眉的降肌和升肌,可以控制眉和额部的重新定位。为了设计出可以使用最小切口技术进行的安全方法,人们对解剖细节进行了研究。了解额部和眶周区域的感觉和运动神经支配,使得能够更准确地操作和修改组织,并允许采用侵入性较小但更有效的技术,如额前和颞部眉提升术。在对内窥镜眉提升术与冠状眉提升术的持久性和有效性进行了一些争论之后,现在有两派:一派仍然主要进行冠状眉提升术。然而,越来越多的外科医生正在成为内镜眉提升术的专家。当正确选择患者时,这些内镜眉提升术能提供可靠且持久的效果。冠状眉提升术、额前眉提升术、额中部眉提升术