BACKGROUND/AIMS External dacryocystorhinostomy (DCR) is a reliable but difficult surgical technique for the treatment of any obstruction of the lacrimal drainage system lying distal to the internal opening of the common canaliculus. In this prospective study, a simplified external DCR procedure and the results obtained on a series of 45 consecutive patients, in which traditional external DCR was indicated, are described.
METHODS In this modified procedure only very large and mobile anterior flaps of the lacrimal sac and nasal mucosa are created. Thanks to the large size and the great motility the two flaps can be easily sutured. Two double armed 6/0 polyglycolic acid sutures are used to join the two flaps, to elevate them anteriorly in order to avoid adhesions with underlying tissues, and to approximate the deep planes of the wound. The mean operative time was measured.
RESULTS At the end of follow up period (mean 17 months, range 14–24 months) all patients had no sign or symptoms of tearing and normal Jones I dye test. The mean operative time was 28.6 minutes (range 23–44 minutes)
CONCLUSION We believe that our modified technique can be used to simplify and speed up traditional external DCR without decreasing its well known reliability.
- external dacryocystorhinostomy
- anterior mucosal flaps
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Obstruction of the lacrimal drainage system occurs most often at either the junction of the sac and the nasolacrimal duct or within the bony nasolacrimal duct. Reconstruction of the lacrimal passages in such cases can be achieved by several surgical techniques, although external dacryocystorhinostomy (DCR), proposed by Ohm and by Dupuy-Dutemps and Bourguet in 1921,1 2 is still the most successful operation.3-5
DCR is not an easy surgical procedure, and good results are only achieved in skilled hands. In this prospective study, a simplified external DCR procedure and the results obtained on a series of 45 consecutive patients are described.
This modification of external DCR has not been previously published to the authors’ knowledge.
Patients and methods
Forty five consecutive patients (mean age 62 years, range 34–79), presenting with unilateral obstruction of the lacrimal drainage system distal to the internal ostium of the common canaliculus were included in our study. All patients presented a negative Jones I dye test, 34 patients had epiphora, seven epiphora and dacryocystitis, three epiphora and mucocele, one mucocele.
Forty two patients underwent day case surgery under local anaesthesia after mild sedation, while the other three opted for general anaesthesia and required an overnight stay.
The mean operative time was measured.
A straight 20 mm skin incision placed 10–12 mm nasal to the medial canthus and tangential to the inferonasal rim of the orbit is made.
Next the orbicularis muscle is bluntly dissected, and the anterior limb of the medial canthal tendon and the periosteum are exposed.
The skin and the orbicularis muscle are then raised medially and laterally with four traction sutures of 4/0 silk.
The periosteum is then incised about 3 mm anterior and parallel to the anterior lacrimal crest. The medial flap is reflected forwards for about 10 mm and raised from the bone with traction sutures (it might be used as a nasal mucosa-like flap in case the last one is damaged, otherwise it is resected at the end of the operation). The lateral flap is elevated with the medial canthal tendon towards the anterior lacrimal crest and the lacrimal sac is then reflected laterally from the floor of the lacrimal fossa.
After this, an osteotomy, 15 × 15 mm wide, in the lateral nasal wall is created and the nasal mucosa exposed. The bony window includes the entire anterior lacrimal crest, lacrimal fossa, and superomedial wall of the nasolacrimal canal. If an anterior ethmoidal cell is entered, the bony aperture is extended in order to expose the nasal mucosa. Nasal mucosa is two to three times thicker than ethmoidal mucosa and less friable and this easy enables the surgeon to identify his or her anatomical location.6
Next, large anterior flaps of lacrimal sac and nasal mucosa are created, as big and mobile as possible. They are joined as follows: two double armed 6/0 polyglycolic acid sutures are passed through the superior and inferior angles of the flaps and closed (Fig 1), one end of each suture is then passed through the orbicularis muscle at the medial edge of the wound and the other is passed through the orbicularis muscle at the lateral edge and closed again (Fig 2). In this way three results are simultaneously achieved: (1) the two flaps are joined; (2) they are elevated forward in order to avoid the adhesion with the underlying tissues (which otherwise could easily occur owing to the large size and the great mobility of the flaps created for simplifying and speeding up their joint); (3) the deep planes of the wound are approximated.
The skin wound is closed with a continuous suture of 6/0 silk.
Meticulous haemostasis is carried out during all phases of the operation. In addition, a gauze packing soaked with cocaine HCl 5% drops and adrenaline 0.1% drops is inserted into the nose (against its lateral wall between the middle and inferior turbinate) before surgery. The use of steroid drops and systemic antibiotics is recommended for 1 week after surgery.7-9
The patency of the dacryocystorhinostomy was examined after 7, 14, 30 days and later every 4 months for the first 2 years. During the first examinations if the dacryocystorhinostomy was found to be blocked, probing was performed, clots were removed, and the use of steroid drops and systemic antibiotics prolonged for one more week.
On postoperative day 7, two cases needed probing and clot removal (one of them was a patient with severe coagulation problems due to thrombocytopenia) while five cases needed only probing. On postoperative day 14 further probing was necessary for two of them.
Mean follow up was 17 months (range 14–24 months). At the end of follow up period, all patients had no sign or symptoms of tearing and normal Jones I dye test.
The mean operative time was 28.6 minutes (range 23–44 minutes).
Since Toti in 1904,10 Ohm,1 and Dupuy-Dutemps and Bouguet2 in 1921 laid the foundation of the modern external DCR, several alternatives techniques such as nasolacrimal duct intubation,11 endoscopic and non-endoscopic endonasal DCR,12-16 and endonasal or transcanalicular laser DCR17-20 have been proposed.
Intubation of the nasolacrimal duct was first described in 1944.11 The results obtained with this technique are poor and variable21 22; the risk of foreign body reaction induced by the tubes is great.23-25
Endonasal DCR is used infrequently even if it does not damage the lacrimal pump, does not cause cutaneous scars, and presents a success rate similar to external DCR.15-17
When compared with a more modern technique such as laser DCR, external DCR is said to result in scarring, greater tissue damage, and frequent haemorrhages. Moreover, patients seems to prefer the laser approach rather than traditional one.4 17 Each of these points can be countered. The cutaneous scar from external DCR rarely causes serious cosmetic problems, especially if the incision respects relaxed skin tension lines.26 Even if tissue damage due to the laser approach is minimal, in clinical practice supplementary turbinectomy or septoplasty may be necessary.27 In addition, the rhinostomy often needs to be enlarged with standard nasal instruments to facilitate silicone intubation.4 The risk of bleeding during laser DCR has not been eliminated and it is comparable with the risk during external DCR.5 28 The preference accorded by many patients for laser DCR is often the result of unjustified emphasis on the absence of cutaneous scar and to poor outline of the risks and benefits of the procedure. Endonasal laser DCR, for example, presents a long term success rate of 75%18 versus 90–100% of external DCR.4 It is impossible after trauma or in the presence of an altered bony anatomy of the region.18 Endonasal and endocanalicular laser DCR are contraindicated if the presence of tumour or dacryolith is suspected: laser DCR, in fact, does not permit any incisional or excisional biopsy of these lesions.
External DCR, proposed more than 70 years ago, is a reliable operation. However, external DCR is not an easy surgical procedure and requires considerable operative time. Its limitations are the difficult resection and suture of the mucosal flaps, and the possible postoperative closure of the newly created lacrimal tract, either by formation of granulation tissue at the osteotomy level or by adhesion of the anterior to the posterior flaps.29
To overcome the limits of traditional external DCR, several authors have suggested modifications.29-35 In this same context we feel that the procedure described here serves as a rational extension of these attempts.
Thus, making anterior flaps only is a common variation of external DCR; in our modified technique they have been created oversized on purpose in order to facilitate their surgical manipulation. Then, they are suspended in order to avoid their possible adhesion to the deeper tissues, which is one of the rare causes of failure of external DCR.29 At the same time, the sutures used to suture and suspend the mucosal flaps close the deep planes of the wound, again speeded up the procedure.
Though the suturing of the anterior and posterior mucosal flaps increases the probability of primary healing of the mucosal anastomosis and reduces the tendency to primary and secondary haemorrhages as pointed out by Jones and Welham,36 37 we have found it simpler in lacrimal surgery to use anterior suspended flaps only.
We believe that this simplified DCR procedure is easy and quick to perform. Thanks to its simplicity it may be suitable not only for oculoplastic surgeons but also for ophthalmologists whose main area of interest is not lacrimal surgery. The results of this study demonstrate the reliability of our modification even if a larger series of cases would be more conclusive.