Nose

Published on 16/03/2015 by admin

Filed under Dermatology

Last modified 22/04/2025

Print this page

rate 1 star rate 2 star rate 3 star rate 4 star rate 5 star
Your rating: none, Average: 0 (0 votes)

This article have been viewed 10246 times

17 Nose

Introduction

The nose represents the central feature of the face with an aesthetically profound effect on the overall balance of the other facial features. Accordingly, enhancing a flat, poorly defined nose can give definition to the face and refine its overall appearance. For this reason, augmentation rhinoplasty has long been practiced as a well-established procedure among Asians, who have relatively smaller noses than Caucasians. Significantly, the ability to conveniently reshape the nose without undergoing surgery is a key benefit of filler rhinoplasty, which has made it one of the most popular filler procedures among Asian patients.

While some drawbacks of filler rhinoplasty versus conventional surgery are the need for repeat treatments when using temporary fillers and the unsuitability for reduction rhinoplasty (e.g. sharpening a bulbous nose, reducing the size of a large hump, or narrowing a wide nasal base), the countervailing advantages are numerous and compelling: it ensures minimum social downtime since there is no significant bruising or swelling even immediately after the procedure compared with surgery; in terms of its safety profile, filler rhinoplasty does not entail any of the potential risks arising from surgery, such as unnatural contractural pull and distortion; furthermore, filler rhinoplasty is capable of making the shape appear more natural by allowing the creation of arches extending from the medial brows to the dorsum of nose.

This chapter aims to provide an overview of the concept, techniques, useful tips, and precautions involved in performing filler rhinoplasty.

The attractively proportioned nose and face

There is no set standard for an ideal nose that works for every face, since aesthetic standards tend to vary among different ethnicities, between the sexes, as well as evolving over time. Just as importantly, facial beauty is a function of the balance among various facial features, including the nose, which together produce an aesthetically pleasing result. Thus, efforts have been directed at identifying the ideal facial and nasal proportions, and effecting changes that afford better proportionality and harmony to the overall face. This notion of facial proportion also assists the field of filler rhinoplasty in the planning of the treatment strategy for a given patient.

The nose is divided into several subportions including the dorsum, sidewall, nasal tip, ala nasi, and columella. Such regional subdivision helps with surgical planning and descriptions of the cosmetic procedures. In addition, there are certain topographic landmarks of the nose used for describing the cosmetic and reconstructive procedures. Recognized topographical facial landmarks are shown in Figure 17.1. Of such landmarks, the nasion, sellion (radix), rhinion, and pronasale are worthy of mention with respect to filler rhinoplasty. Although the term ‘nasion’ is sometimes confusingly used to refer to the deepest point of the nasal root, it in fact represents the median anterior tip of the nasofrontal suture. Rather, the sellion represents the deepest point of the nasal bone or the nasofrontal angle. Since the sellion is also the bony landmark, corresponding to surface anatomy, the term ‘radix’ is used for the deepest point of the nasal root or the nasofrontal angle. Rhinion refers to the osteocartilaginous junction, while pronasale is the most prominent point of the nasal tip and the subnasale represents the junction between the columella and philtrum.

On the frontal view, a balanced face should divide into equal vertical thirds and equal horizontal fifths, as shown in Figure 17.1. The ideal length of the nose in proportion to the face is three-quarters the length of the lower one-third of the face, from the subnasale to mentum. Meanwhile, the ideal nasal width at the alar base is believed to correspond to the intercanthal distance, which equals one-fifth of the facial width. The width of the body of the nose should be 80% of the width of the nose at the alar bases. The narrowest point of the nasal dorsum is at the radix, where the width at the radix approximates the height of the palpebral fissure. A gentle curve emanating from the medial brow courses along the lateral border of the nasal dorsum to end at the ipsilateral tip-defining point. Any irregularities of this line will be easily noticeable as deviations from the contralateral line, thereby contributing to asymmetry and unsightly appearance.

On the lateral view, there are certain facial angles related to the nose that deserve special mention in evaluating filler rhinoplasty patients (Fig. 17.2). The glabella-to-radix line intersecting with the radix-to-tip line forms the nasofrontal angle. Ideally, this angle should be within 115–130°. Meanwhile, the nasofacial angle is the angle formed by the line tangent to the nasal dorsum intersecting with the vertical facial plane, which is a two-dimensional coronal section connecting the glabella-to-pogonion line. The aesthetic ideal for the nasofacial angle is 35–40°. The nasolabial angle is defined by the line from the subnasale to the superior vermilion border of the upper lip intersecting with the line tangent to the columella from the subnasale. The ideal aesthetic range should be between 90° and 110° depending on the ethnicity and sex.

Injection technique (Fig. 17.4)

Whereas some practitioners only use the needle for filler rhinoplasty, others prefer the cannula; it is a matter of personal preference. As a general rule, however, when augmentation is performed on the entire nasal dorsum or whole nose including the columella, using a cannula has some benefits over using a needle because it can prevent risks of unwanted bruising as well as embolization, which is the most significant adverse effect in filler rhinoplasty. Regarding the size of cannula, 21 gauge is required for Restylane® SubQ because of its large particle size. When the cannula is used for filler rhinoplasty, an entry point for the blunt cannula should be made at the infratip lobule of the nasal tip by a 21-gauge sharp needle. Local anesthetics containing lidocaine with 1 : 100 000 epinephrine are to be injected at the entry point. After waiting for 3–5 minutes for the epinephrine to induce blanching on the skin, the entry point for the cannula is punctured using a 21-gauge needle at an angle parallel to the Frankfurt line.

The cannula is to be inserted into the entry point created at the nasal tip, and pushed all the way up to point just above the sellion for dorsum augmentation or posteriorly to the nasal spine in the case of tip elevation. The depth of the cannula insertion should be at the deep subcutaneous layer. Using the retrograde threading technique, inject the filler in volumes sufficient to raise the dorsum or nasal tip to the desired height. The 30-gauge needle is also recommended for making any contemporaneous fine corrections following filler placement with the cannula.

Use of the 30-gauge needle is also acceptable, however, in simpler cases involving, for example, mild hump corrections, small amount injections, or superficial injection to the nasal tip, or when the patient has a low tolerance for pain from local anesthetic injection. It bears noting, however, that, when the procedure calls for the use of the needle, aspirations for blood should be performed with a tug of the plunger to confirm that the needle is not inadvertently placed in a blood vessel prior to each injection of fillers so as to avoid any unwanted complications from intravascular injection.

Injection techniques by nasal region

Nasal dorsum augmentation (Fig. 17.4)

This procedure should preferably be performed using the cannula. This is to be inserted into the entry point and pushed all the way up to the point just above the sellion, along the midline of the nasal dorsum. The depth of the cannula insertion should be at the deep subcutaneous layer, more specifically the supraperiosteum layer. In order to confirm that the cannula tip is properly positioned on the nasion, a useful test is to gently tilt the inserted cannula tip upwards to ‘tent’ the skin from beneath. Upon successful testing, placing the thumb and the index finger of the non-injecting hand on the sellion, gently pinch the dorsum of the nose to prevent the filler from spreading laterally upon injection. The filler should be injected continuously in a retrograde manner so as to build a ‘column’ of the injected filler to the desired height. Subsequent filler injections are made on either side of the ‘column’ to the desired width using the same technique. The height of the subsequently injected filler on each side should be lower than that of the central column, so that the transition to the nasal sidewall is natural. More specifically, any contour irregularities between the heightened nasal dorsum and the sidewall can be feathered out by placing HA fillers with a 30-gauge needle. While the radix, which is the deepest point of the nasal root, in an Asian face typically sits on the intercanthal line that connects the medial canthus of both eyes, the injection of fillers into the sellion relocates the radix to sit 3–5 mm above its original position in line with the eyelashes. As to the lower portion of the nose, fillers may be injected either as far down to the nasal lobule where augmentation of the nasal tip is required, or otherwise only cephalic to the supratip break.

When using the 30-gauge needle for the procedure, filler injection also begins at the sellion (radix) so that the upper nasal dorsum is built up to the desired height before subsequently progressing down the length of the nasal dorsum. Standing in front of the patient, the thumb and index finger of the non-injecting hand are placed at the sellion, gently pinching the dorsum of the nose to prevent the filler from spreading laterally upon injection. Piercing the skin just 2–3 mm cephalic to the rhinion in the midline of the nasal dorsum, advance the needle along the dorsum at a depth where it reaches the periosteum above the sellion. Inject the filler in a retrograde manner in the desired amount to elevate the dorsum of the nose. Subsequently, inject the lateral sides of the injected filler in order to smoothen out the contours on the sidewalls. Repeat the above-mentioned threading injections two or three times in the region between the rhinion and the nasal tip to achieve alignment with the previously injected filler in the upper dorsal region. It must be pointed out that the injection must be ceased prior to the final withdrawal of the needle in order to avoid any surface irregularities caused by superficial placement of filler.

As the final step of dorsum augmentation, create an arch extending from the medial brow to the dorsum of the nose. Stand behind the patient and pierce the skin at the glabellar, positioning the syringe vertically downward, at depths where the needle reaches the periosteum, and advance to the nasion or the newly formed radix. Inject the filler using the thread technique to ensure the appropriate nasofrontal angle in accordance with the heightened midline of the upper nasal dorsum. Next, insert the needle again in the region medial to the brow and advance towards the sidewalls of the radix. Inject the filler in the same manner to create an arch from the medial brow to the dorsum. This process is particularly essential in patients with a deep glabellar frown line.

Correction of the nasal tip

A weak and overly narrow nasal lobule can be corrected by placing fillers into the interdomal area. Augmenting the lobule by filling the interdomal area also helps in cases where the overlying skin or the subcutaneous fat above the alar cartilage is too thin, causing the alar cartilage on either side to become overly visible. A bifid tip can also be successfully treated with filler injection into the nasal tip. Conversely, filler injection into the interdomal area is not advised for patients with a large nasal lobule, since they would end up instead with a prominently bulbous nose.

Meanwhile, in order to raise the tip of the nose, injection is to be made between the footplates of the medial crura and the anterior nasal spine or in the columella, as opposed to the nasal lobule itself, so as to uplift the nasal tip effectively while avoiding unwanted bulbosity at the tip of the nose. The softer the nasal lobule, the easier it is to raise the nasal tip; conversely, a thick hard lobule with abundant fibrous tissue does not lend itself easily to nasal tip elevation. The amount of filler for raising the tip is variable from 0.3 to 1.2 mL depending on the individual.

Injection techniques by each type of nose

Adverse effects

The most serious adverse effect relating to filler rhinoplasty would be embolization due to intravascular injection of fillers. It is for this reason that use of a cannula is generally recommended to guard against such risks; where the situation calls for the use of a needle, aspiration for blood should be performed before each filler injection to prevent any intravascular injection. While intravascular injection in the worst case could even lead to skin necrosis, in most cases infection can be suspected when patients present with erythematous swelling in combination with multiple pustules (Fig. 17.9). Any blanching occurring immediately after the filler injection followed by subsequent violaceous color change should be considered as an ischemic sign of embolization, for which adequate treatment must be administered.

If the injected filler material consists of HA, hyaluronidase must be injected as a matter of priority into the lesion as well as into the adjacent areas to dissolve the HA filler. Applying warm massage to facilitate blood circulation is necessary, while sublingually administering nitroglycerin to stimulate peripheral circulation. Intramuscular injection of a steroid such as dexamethasone is also recommended for reducing inflammation.

Patients suffering from infection due to contamination during the procedure will present with typical inflammatory signs such as severe swelling and redness of the nose as well as localized heating and tenderness. If infection is suspected following injection of HA filler, the injected filler should be degraded with hyaluronidase in conjunction with a 3-day administration of antibiotics, after which almost all of the inflammatory signs will disappear. Where other types of filler material were used, the symptoms may persist for 7–10 days.

Other adverse effects include temporary redness, which may on occasion persist over several months. Such complication is presumed to arise from vascular dilatation triggered as a secondary reaction to compensate for the impaired circulation from vascular compression caused by injection of fillers into a confined space. Symptoms persisting for several months can be reversed by injecting hyaluronidase only if HA fillers were used.