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Chapter
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14
Venoactive Drugs
Table 14.3 Levels of evidence and grades of recommendations
Recommendation Compounds RCT Meta-analyses
Grade A Micronized purified flavonoid fraction (MPFF) Gilly 1994 Coleridge-Smith 2005
Guilhou 1997
Chassignolle 1999
Danielsson 2002
Das 2003
Veverkova 2005
Pokrovsky 2007
Simsek 2007
Oxerutin Kranendonk 1993 Poynard 1994
Diebschlag 1994
Cloarec 1996
Unkauf 1996
Grossmann 1997
Calcium dobesilate Casley-Smith 1988 Espinoza 2001
Widmer 1990 Ciapponi 2004
Labs 2004
Rabe 2006
Martinez 2008
Grade B Horse chestnut seed extracts (escin) Diehm 1996 Pittler 2002
Siebert 2002
Ruscus extracts Vanscheidt 2002 Boyle 2003
Parrado 1999
Grade C Diosmin Carpentier 1994
Troxerutin Vin 1994
Rehn 1993
Troxerutin-Coumarin Vanscheidt 2002
Gingko biloba Zuccarelli 1986
Natali 1989
Proanthocyanidines Kiesewetter 2000
Petrassi 2000
Naftazone Vayssairat 1997
RCT, randomized controlled trials. Grade A: RCT with large sample sizes, valid meta-analyses. Grade B: RCT with small sample size. Grade C: Other controlled trials, no RCTs.
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374
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venous disease: the example of Daflon 500 mg. Phlebolymphology 2009, in press.
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56. Incandela L, Belcaro G, Renton S, et al. HR (Paroven; O-(β-hydroxyethyl)­rutosides) in venous hypertensive microangiopathy: a prospective, placebo controlled, randomized trial. J Cardiovasc Pharmacol Ther 2002; 7(Suppl 1):S7.
57. Petruzellis V, Troccoli T, Candiani C, et al. Oxerutins (Venoruton): efficacy in CVI: a double blind, randomized, controlled study. Angiology 2002;53:257.
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59. Diehm C, Vollbrecht D, Amendt K, Comberg HU. Medical edema protection – clinical benefit in patients with chronic deep vein incompetence. A placebo controlled double blind study. Vasa 1992;21:188.
60. Diehm C, Trampisch HJ, Lange S, Schmidt C. Comparison of leg compression stocking and oral horse-chestnut seed extract therapy in patients with chronic venous insufficiency. Lancet 1996;347:292.
61. Pittler MH, Ernst E. Horse chestnut seed extract for chronic venous
insufficiency: a criteria-based systematic review. Arch Dermatol 1998;134:1356.
62. Koch R. Comparative study of Venostasin and Pycnogenol in CVI. Phytotherapy Res 2002;16:S1.
63. Siebert U, Brach M, Scrozynski G, Berla K. Efficacy, routine effectiveness and safety of horse chestnut seed extract in the treatment of CVI: a meta analysis of randomized controlled trials and large observational studies. Int Angiol 2002;21:305.
64. Pittler MH, Ernst E. Horse chestnut seed extract for chronic venous insufficiency. Cochrane Database Syst Rev 2004;(2):CD003230.
65. Cappelli R, Nicora M, Di Perri T. Use of extract of Ruscus aculaeatus in venous diseases of the lower limbs. Drugs Exp Clin Res 1988;4:277.
66. Le Devehat C, Khodabandehlou T, Vimeux M, Dougny M. The effect of Cyclo 3 Fort® treatment on hemorheological disturbances during a provoked venous stasis in patients with chronic venous insufficiency. Clin Hemorheol Micorocirc 1994;14:S53.
67. Parrado F, Buzzi A. A study of the efficacy and tolerability of a preparation containing Ruscus aculeatus in the treatment of CVI of the lower limbs. Clin Drug Invest 1999;18:255.
68. Jäger KA, Eichlisberger R, Jeanneret CH, Labs KH. Pharmacodynamic effects of Ruscus extract (Cyclo 3 Fort) on superficial and deep veins in patients with primary varicose veins: assessment by duplex sonography. Clin Drug Invest 1999;17:265.
69. Beltranimo R, Penenory A, Buceta AM. An open label, randomized multicenter study comparing the efficacy and safety of Cyclo 3 fort versus hydroxyethyl rutoside in chronic venous lymphatic insufficiency. Angiology 2000;51:535.
70. Bouaziz N, Michiels C, Janssens D, et al. Effect of Ruscus extract and hesperidin methylchalcone on hypoxia-induced activation of endothelial cells. Int Angiol 1999;18:306.
71. Vanscheidt W, Jost V, Wolna P, et al. Efficacy and safety of a Butcher’s broom preparation compared to placebo in patients suffering from chronic venous insufficiency. Arzneimittelforschung 2002;52:243.
72. Boyle P. Meta-analysis of clinical trials of Cyclo 3 Fort in the treatment of chronic venous insufficiency. Int Angiol 2003;22:250.
73. Lascasas Porto CL, Milhomens AL, Pires CE, et al. Changes on venous diameter and leg perimeter with different clinical treatments for moderate chronic venous disease: evaluation using Duplex scanning and perimeter measurements. Int Angiol 2009;28:222.
74. Guex JJ, Enriquez Vega DM, Avril L, et al. Assessment of quality of life in Mexican patients suffering from chronic venous disorder – impact of oral Ruscus aculeatus-hesperidin­methyl-chalcone-ascorbic acid treatment – ‘QUALITY Study’. Phlebology 2009;24:157.
75. Natali J. Gingkor Fort et maladie veineuse. Angiologie 1989;102:3.
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77. Zucarelli F. Evaluation de l’efficacité de Ginkor Fort sur la symptomatologie fonctionnelle de l’insuffisance veineuse chronique. Angiologie 1996;49:1.
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81. Kiesewetter A, Koscielny J, Kalus U, et al. Efficacy of orally administered extract of red wine leaf AS 195 in chronic venous insufficiency (stages I-II). A randomized double blind, placebo controlled trial. Arzneimittelforschung 2000;50:109.
82. Constantini A, Bernardi T, Gotti A. Clinical and capillaroscopic evaluation of chronic uncomplicated venous insufficiency with procyanidins extracted from vitis vinifera [in Italian]. Minerva Cardioangiol 1999; 47:39.
83. Petrassi C, Mastromarino A, Spartera C. Pycnogenol in CVI. Phytomedicine 2000;7:383.
84. Rohdewald P. A review of the French maritime pine bark extract (Pycnogenol), a herbal medication with a diverse clinical pharmacology. Int J Clin Pharmacol Ther 2002;40:158.
85. Arcangeli P. Pycnogenol in chronic venous insufficiency. Fitoterapia 2000;71:236.
86. Casley-Smith JR. A double-blind trial of calcium dobesilate in chronic venous insufficiency. Angiology 1988;10:853.
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C H A P T E R
Setting Up a Sclerotherapy Practice
Providers
Before proceeding with the practical aspects of establishing a practice, one must decide who will deliver patient care. Most physicians agree that a physician should perform the sclero­therapy procedure; however, some clinics use nurses to treat spider telangiectasias. A survey of the membership of the North American Society of Phlebology (NASP) (now the American College of Phlebology (ACP)) found that approxi­mately 25% of the members would allow a registered nurse and 20% would allow a nurse practitioner to perform sclero­therapy on spider veins. would allow a registered nurse to perform sclerotherapy on varicose veins versus 7% who would allow nurse practitioners to perform this procedure. Registered nurses can legally perform intravenous therapeutic injections in most states. Physicians should check with the state licensing board for nursing for the specific requirements.
The arguments for allowing nurses to render such care are both economic and procedural. An economic benefit is real­ized for both the patient and the physician if a lower-salaried person performs the sclerotherapy procedure, especially in these days of cost containment. Since the injection of spider veins is primarily cosmetic and is rarely fully reimbursable under most insurance plans, cost containment can be trans­lated into economic marketing.
Because the cannulation of a blood vessel is relatively easy to perform and few serious or life-threatening complications can arise from sclerotherapy treatment of spider telangiecta­sias, an argument can be made for using nonphysicians as sclerotherapists. On the other hand, although rare, serious complications can result from injection of spider telangiecta­sias. Anaphylactic allergic reactions have occurred with many sclerosing agents; a fatality was reported after a ‘trial’ injection of sodium tetradecyl sulfate. occurred from the injection of leg telangiectasias (see Chapter
8). Injection into an arteriovenous anastomosis usually pro­duces a cutaneous ulceration, and cutaneous ulceration from sclerotherapy injection (extravasation or arteriolar injection) is the most common reason (in sclerotherapy) for medical malpractice litigation. Injection into a superficial artery, espe­cially around the malleoli, can lead to arterial emboli and pedal gangrene. Duplex-guided injections into deep perforat­ing veins can cause significant muscular necrosis requiring leg amputation. Thus, as with most of medicine, sclerotherapy is not entirely risk-free. The physician is ultimately responsible for ensuring that the nurse is properly trained both in per­forming sclerotherapy and in recognizing adverse sequelae. The physician, not the nurse, will be the one sued for malpractice.
In addition to being skilled at sclerotherapy technique, the sclerotherapist must have a thorough knowledge of the anatomy and pathophysiology of venous disease and of the mechanism of action of the procedure, including its potential complications. The ability to appreciate these mechanisms
1
Of NASP members surveyed, 10%
2
Pulmonary emboli also have
and immediately recognize potential complications and render preventive treatment is critical to maintaining optimal patient care. Furthermore, a thorough understanding of vas­cular hemodynamics, including the relationship between deep and superficial venous insufficiency, is imperative to those practicing sclerotherapy. For example, venous segments with a certain degree of incompetence are best initially treated with endovenous ablation, which removes the source of venous hypertension, thus reducing or eliminating progres­sion of reflux to other surrounding veins. to recognize when endovenous ablation is a necessary portion of the overall treatment approach results in inadequate improvement following sclerotherapy. Thus, clinical judg­ment as well as technical skill are both essential attributes in an effective sclerotherapist.
Hallgren et al5 defined basic nursing assessment skills and the requirements for transfer of function of the nurse in a sclerotherapy–phlebology practice. In short, for a nurse to function as a sclerotherapist, the following must be known:
Nature and purpose of the procedure
Specific conditions under which the procedure may be
performed
Potential complications of the procedure and methods
for notifying the physician and stabilizing the patient with immediate countermeasures
Knowledge of the mechanism of action and potential
side effects of sclerosing solutions
Contraindications to sclerotherapy.
This knowledge base should also include instruction so that the nurse can do the following:
Record appropriate physical findings such as size,
location, and type of vein and associated cutaneous manifestations of venous hypertension
Recognize and describe the presence and extent of
superficial and deep thrombophlebitis and venous ulceration
Perform a noninvasive physical examination to include
identifying the presence or absence of reflux from the saphenofemoral or saphenopopliteal junctions and/or perforator veins through venous Doppler and/or duplex ultrasound examination; perform photoplethysmography
Photograph the patient’s leg in four general views and
specific close-up views to document pre-existing cutaneous irregularities and the specific area of telangiectasia
Complete detailed mapping of the varicose and
telangiectatic leg veins
Locate pedal pulses; determine the brachial and ankle
blood pressures to determine the degree of arterial insufficiency
Accurately measure and fit the patient with a graduated
compression stocking
Apply a graduated compression bandage/stocking.
In conclusion, nurses who practice phlebology must be actively involved in the practice of nursing when delivering
3,4
Not being trained
care. They should be able to prepare not only the operating
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room for the procedure, but also the patient for the procedure by answering questions, allaying fears, and documenting pre­treatment disease. In addition, follow-up treatments allow the nurse the opportunity to reinforce patient teaching so that preventive measures can be emphasized. For an excellent dem­onstration of lower extremity superficial venous examination techniques, the reader is encouraged to refer to an educational DVD provided by the American College of Phlebology part­nered with the Society of Vascular Ultrasound.
6
Various other comprehensive textbooks on sclerotherapy, phlebectomy, and venous ultrasound techniques are available; we have refer­enced those textbooks that we feel are the most useful at the end of this chapter.
7–10
A
B C
Equipment
Facility
Endovenous laser ablation of leg veins is best performed in a non-facility setting, as this eliminates additional facility fees associated with procedures performed in a hospital or ambu­latory care facility. By having his/her procedure performed in an outpatient setting, patients save money by not having to pay facility fees, and practitioners generate more revenue by not having to split reimbursement payments with a
11
facility.
Equipment
Relatively little specialized equipment is required to perform successful sclerotherapy. Various types of lasers may also be required for treating specific types of leg veins (see Chapter
13). For now, all that is required is a needle, syringe, sclerosing solution, binocular loupe, foam pads, tape, graduated support stockings, and camera. (See online Appendix C for informa­tion on manufacturers.) Although serious adverse events are rarely encountered during the treatment of leg veins, appropri­ate resuscitation equipment must be readily accessible throughout the procedure. Patients occasionally experience vasovagal reactions during the treatment of leg veins; ammo­nium capsules as well as oxygen can help mitigate these reac­tions. Other equipment, including an emergency resuscitation (crash) cart as well as an electrocardiograph, should remain readily accessible throughout the procedures.
Ultrasound devices
A duplex ultrasound device is essential for both diagnosis and treatment of venous disease. It can help discern superficial and deep venous insufficiency, allow for pretreatment vein mapping, provide imaging and guidance during the proce­dure, and allow for postoperative assessment of therapeutic efficacy.
have in a sclerotherapy practice. It allows for assessment of venous reflux and is an integral component of the work-up as well as the preoperative mapping during endovenous laser ablation procedures. Dopplex devices (Huntleigh Healthcare, Luton, UK) use a probe that is three times wider and 50% more sensitive than standard probes, making it easier for the practitioner to locate and maintain contact with vessels. The Mini Dopplex is a lower cost, yet still effective, hand-held doppler device. The ‘top of the line’ hand-held Doppler is the bi-directional Super Dopplex II, which can assess simultane­ous forward and reverse venous flow, thus offering an advan­tage over non-directional and even most bi-directional Dopplers.
Wash., USA) includes a durable, hand-held computer which
13
A hand-held vascular Doppler is another valuable tool to
The MicroMaxx ultrasound system (SonoSite; Bothell,
12
D
Figure 15.1 Comparison of bevels of recommended needles. A, Acuderm
needle, 30 gauge. B, Becton-Dickinson (B-D) needle, 30 gauge. C, Yale needle (B-D), 27 gauge. D, Yale needle (B-D), 26 gauge. E, Butterfly needle (Abbott), 25 gauge. F, Butterfly needle (Abbott), 23 gauge.
E F
uses an image enhancement algorithm to optimize the clarity of venous imaging (vein mapping, venous reflux assessment, and venous ablation guidance). This lightweight, portable platform boots up in around 15 seconds, is able to send wire­less images to other clinic sites, and comes with multiple transducers.
Needles
The injection of telangiectasias requires a fine-gauge needle. A needle with a clear plastic hub instead of a metal hub is useful to allow visualization with aspiration. Although some physi­cians prefer to use a 32- to 33-gauge or 26- to 27-gauge needle, we prefer the 30-gauge needle. There are two types of 30-gauge needles. One is the Becton-Dickinson (B-D) Precision Glide needle (Becton, Dickinson & Co, Rutherford, N.J.), which has an elongated bevel on a at the tip. The needle can be easily bent at varying angles to penetrate telangiectasias. In addition, it is relatively sharp and holds up well when used for multiple punctures of the skin. The second type is a tribevel tipped needle. The Acuderm (Acuderm, Ft Lauderdale, Fla.) and Delasco (Dermatologic Lab & Supply, Council Bluffs, Iowa) 30-gauge needles have a
1
-inch metal hub and a silicone-coated tribevel point. This
2
type is preferred because its silicone coating and more acute angle at the tip allow it to pierce the skin with less pain. In addition, the length of the bevel is shorter than that of the B-D needle. Accordingly, extravasation of solution perivascu­larly while the needle is in the vessel lumen is less likely. Tribeveling of the tip also makes it harder, so it retains its sharpness with multiple injections. A comparison of the bevels of all of the recommended needles is shown in Figure
15.1. However, even with this magnified comparison, the dif-
ferences between the needle tips cannot be fully appreciated. Clinical trials using each needle type are necessary to discern the subtle differences.
In addition, the same needle may actually change from year to year if the company chooses a different manufacturer. It is best to try different needles from different companies at least once yearly to determine which brand works best. The best test is to use each needle on both a patient and yourself to determine the ease of insertion into the skin and the feel.
One objection to the use of a 30-gauge needle has been the perception that it dulls after multiple insertions into the skin. Microscopic examination of tribeveled needles used to pierce the skin up to 15 times in our patients did not show the needle
1
/
-inch needle with a 45-degree angle
2
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10ml987654321
Figure 15.3 Plastipak eccentric syringe by Becton-Dickinson. Note
eccentrically placed hub.
Delasco 33-gauge
Figure 15.2 Comparison of 33-gauge Delasco needle tip with a 30-gauge
tribevel point.
Setting Up a Sclerotherapy Practice
30-gauge
with
tribeveled
point
tip had dulled. What is apparent is that some needles, even when unused, have burrs or are dull. Therefore, if the insertion of the needle does not feel right, change to another needle and discard the old one.
Some sclerotherapists advise the use of a 33-gauge needle to cannulate the smallest diameter telangiectasia. Multiple 31- to 33-gauge
1
-inch needles are available (Fig. 15.2). These
2
needles have several drawbacks. They are more expensive than 30-gauge needles and must be cleaned and sterilized between patients if they are not disposed of (this is of concern to patients who fear inadequate sterilization with the subse­quent risk of blood-borne pathogens). Repetitive sterilization also dulls the needle point. In addition, the tips of these needles bend and dull more quickly than those of the 30­gauge needles, and the needle shafts are thinner and thus less stable during injections through tough skin. John Phiffer (personal communication, 1992) reported on the construc­tion of a rigid shaft used to support the 32-gauge needle tip to help stabilize it. However, as mentioned previously (Chapter
12), we find these needles of little use.
Finally, some physicians prefer 26- or 27-gauge needles for injecting telangiectasias. Again, the preference arises from a perceived sharpness of the bevel, allowing easier, more pain­less insertion. The 27-gauge needle comes separately in a inch length as either a Yale (Becton, Dickinson) hypodermic needle or as an allergy needle–syringe combination fixed to a 1-mm syringe. The benefit of using the 1-mm syringe is the ease of handling perceived by some sclerotherapists. The Yale 26-gauge needle also comes in a
1
-inch length and has the
2
advantage of a sturdy, nonbendable shaft. In short, all types have their advantages and disadvantages. The best needle is the one with which the physician is most comfortable.
Larger needles are used most often to inject varicose veins. When injecting varicose veins, it is critical to determine the proper placement of the needle. Therefore, the smallest rec­ommended needle size is 25-gauge (23-gauge if there is any doubt whether the vessel to be cannulated is an artery or vein or if a highly caustic sclerosing solution is being used). Larger­bore needles offer no additional advantage. A 25-gauge needle easily allows retrograde blood flow through the inserted needle, which aids in determining if placement is intravenous or intra-arterial.
The surest method of determining proper needle placement is to insert an open needle into the vein. With this technique, blood flow from the needle serves as the indicator of arterial versus venous injection. Butterfly needles are connected to clear tubing that allows visualization of blood flow, avoiding or minimizing blood exposure. In an effort to avoid blood exposure, some sclerotherapists attach a syringe to the needle and withdraw to determine flow. Still others combine the needle with a glass syringe to ‘feel’ for proper intravascular placement.
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To take advantage of the safety of a large-gauge needle without incurring the risk of blood contamination, a 23-, 25-, or 27-gauge butterfly needle may be used. The needle length
3
is
inch, and the tubing is 30 cm. The plastic tubing on the
4
proximal end of the needle allows visualization of arterial versus venous flow without risking blood exposure. The tubing takes up 0.41 mL of fluid. Some physicians fill the needle tubing with sclerosing solution to prevent clotting of blood within the needle tubing. However, this is unnecessary if the injection is performed within a few minutes of blood aspiration.
Small vein infusion sets are also available. Kawasumi Labo­ratories have designed a 27-gauge
3
1
(
-inch) catheter tubing. The priming volume with this short
4
3
-inch needle on a short
8
length is 0.05 mL. The female Luer-Lok connector has a flange for easy grip. STD Pharmaceuticals (Hereford, UK) have a 30-gauge needle set with the needle attached to the tubing without wings and the other end of the tubing connected to a standard clear plastic female Luer-Lok [0].
Syringes
Although glass syringes had been used in the past to allow easy detection of an arterial puncture, modern plastic syringes have a feel comparable to that of glass syringes. Disadvantages of using a glass syringe are that it requires practice both to fill and to use smoothly as well as the fact that it must be cleaned and sterilized between patients.
The 3-mL plastic syringe, Luer-Lok (Becton, Dickinson), is used exclusively in our practice. This syringe allows the use of an ideal quantity of solution, and when filled to a 2-mL capac­ity, it fits easily in the palm of the hand. However, a non­Luer-Lok syringe has the advantage of possessing a needle hub
1
-
2
that is able to separate from the syringe if resistance, which indicates noncannulation of a vessel, is encountered. Each syringe manufacturer coats the inner portion of the syringe with silicone to allow smooth action by the plunger. The addi­tion of silicone to coat the barrel of the syringe has also been shown to decrease the half-life of bubbles when foam is gener­ated in the syringe (see Chapter 9). If using foam, one may wish to use a syringe with the least amount of silicone coating. The physician should evaluate different types of syringes to determine which has the best feel for his or her use.
If one does not bend the needle to facilitate penetration of the vein, the Plastipak eccentric syringe (Fig. 15.3) is useful. With this syringe, the hub is eccentrically placed at the syringe tip so that it abuts the skin surface. It is available in sizes of 1, 2, 5, and 10 mL.
Sclerosing solutions
The various sclerosing solutions available are discussed in detail in Chapter 7. Addresses of the manufacturers and dis­tributors of these solutions are listed online in Appendix B.
Binocular loupes
Protective eyeglasses are necessary equipment for the physi­cian who performs any surgical procedure. These glasses should be constructed to prevent the splatter or spray of body fluids (blood) as well as sclerosing solution from coming in contact with the orbital tissues, thus helping to prevent
va = ha + da
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Horizontal
Head angle
(ha)
Viewing
angle (va)
Equipment
Head erect Head tilted
Convergence angle
Working distance
Viewing angle
Depth of field
Declination
of angle
Object
Field of view
Magnification scotoma
Object
Line of sight
Figure 15.4 Several key optical features, including working distance, working range, convergence angle, field of view, and viewing angle, are shown.
(Courtesy of General Scientific Corporation, Ann Arbor, Mich.)
the physician’s contamination with infectious, blood-borne disease. When cannulating small diameter telangiectasia, it is common to begin injecting solution as one enters the skin. This allows the needle hub to enter the vessel and expand it to allow full insertion of the needle hub and sclerosing solu­tion. During this process a spray of sclerosing solution is pos­sible. Protective glasses should be worn when performing sclerotherapy.
The injection treatment of varicose veins does not require magnification of the surgical field. However, for cannulating venulectases or telangiectasias, magnification of the treatment site is important. The enhanced detail that magnification affords a more accurate placement of the needle within the vessel lumen, which prevents extravasation of the sclerosing solution into extravascular spaces.
Normally, to magnify the field of vision, one moves closer to the viewed object to enlarge its field on the retina. Moving closer to an object requires the eyes to refocus and converge more. The consequences of maintaining this close focusing distance are eye strain and back muscle stress. Eye tension and muscle fatigue may then occur, which tends to reduce effi­ciency. Optical magnification offers an alternative to such
strain and allows maintenance of a more comfortable working distance.
The magnifying loupe allows the focusing and converging systems of the eye to relax. The loupe also allows switching back and forth between normal vision and magnified vision as necessary. This versatility is relaxing to the eyes. Viewing through magnification for long periods is not harmful and cannot damage vision. The only question concerns how much magnification is necessary.
The ideal magnifier provides a wide field of view with distortion-free magnification within a reasonably long working distance and ergonomic viewing angle (Fig. 15.4). Unfortu­nately, with currently available optics, the higher the magni­fication, the smaller the field of view and depth of field. Complex, multilens binocular magnifiers overcome some of the limitations of short working distances. Some of these mag­nifiers are detailed online in Appendix C. An independent evaluation of magnifiers appears in another source.
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The ideal ergonomic magnifier would be comfortable to wear (lightweight with comfortable nose pads), allow a com­fortable working distance, and maintain the surgeon’s neck and back in a neutral position (Fig. 15.5). An increase in the
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Setting Up a Sclerotherapy Practice
Poor posture
A B
Table 15.1 Comparison of loupe magnification
Refractive Power
Excellent posture
Figure 15.5 A, Some binocular loupes require
surgeon to bend the neck to see the surgical field, putting strain on the neck and upper back. B, Proper fitting loupes maintain good posture while allowing the surgeon to focus on the surgical field.
Measurement 3 Diopters 5 Diopters 8 Diopters
Magnification
Lens-to-object distance (cm)
Eye-to-object distance (cm)
Field of view (cm) 8 4 2
Depth of field (cm) 25 8 1
×1.75 ×2.25 ×3
8–34 13–20 10
17–45 22–36 20–25
head/neck tilt angle causes neck muscle fatigue. with proper posture thus decreases stress and fatigue.
Two types of optics are commonly available. Gallilean optics are shorter and lightweight but have a mild distortion (10%) at the periphery. Prismatic optics have a narrower field of vision but have no lateral distortion. The prismatic optics require more light than the Gallilean optics because of their increased length.
When choosing the proper magnification, five factors must be addressed:
Magnification
Lens-to-object distance
Eye-to-object distance
Field of view
Depth of field.
Table 15.1 shows a comparison of these factors in regard
to a person with normal focusing-converging ability. Note that magnifications greater than 5 diopters decrease the field of view and depth of focusing sufficiently to make their use impractical for sclerotherapy. In our experience, lenses with 2× to 3× power provide the ideal combination of focal dis­tance and magnification.
Magnifying glasses
Half-frame clip-on lenses are available in multiple powers. The most useful is a 5-diopter, 2.25×-power lens with a 19-cm
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16
Working
Figure 15.6 Almore clip-on loupe. (Courtesy of Almore International, Inc.,
Beaverton, Oreg.)
focal distance. These lenses produce marked peripheral distor­tion but have a usable field of view of 7 cm for the 3-diopter and 5 cm for the 5-diopter lens. The working distance from lens to object is 17 cm for the 3-diopter and 12 cm for the 5-diopter lens (Fig. 15.6). This type of magnification aid is available from most opticians and department stores.
Headband-mounted simple binocular magnifiers
Headband-mounted magnifiers are available equipped with interchangeable lens plates that provide a range of magnifica­tion from 1.5× to 3.5× (Fig. 15.7). These magnifiers can be worn comfortably over prescription eyeglasses. The most widely used magnifications with the least peripheral distor­tion and best working distance are 2.3× and 2.5×. An optional Optiloupe (Donegan Optical Co, Lenexa, Kan.) attachment lens adds 2.5× magnification to any base lens but has a very small field of view without distortion. These magnifiers are available from many manufacturers and vary in price, type of headgear padding, and adjustability; Optivisor (Donegan Optical) and Mark II Magni-Focuser (Edroy Products Co, Nyack, N.Y.) are two examples.
Simple binocular loupes
The Precision (Almore International, Beaverton, Ore.) binocu­lar loupe comes with varying diopter loupes fitted on a double-hinged telescoping rod so that the eye-to-object
Figure 15.7 Magni-Focuser. (Courtesy of Edroy Products Co., Inc, Nyak, NY.)
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Figure 15.8 Almore 3-diopter loupe. (Courtesy of Almore International, Inc.,
Beaverton, Oreg.)
distance can be adjusted. It is available with 3-, 5-, or 8-diopter
17
lenses
(Fig. 15.8) and is also available as a multidistance
headband-mounted loupe. Available powers include 1.5×,
1.75×, 2.25×, and 2.75×, with working distances from 50 to 15 cm, respectively.
It also comes with an adjustable bridge-of-nose-to-lens dis­tance of 9 to 21 cm, thus increasing the eye-to-object distance from 19 to 44 cm depending on the diopter used. The 3-diopter lens has a 13-cm usable field of view and a working distance of 16 cm from lens to object. The 5-diopter lens has a 10-cm usable field of view and a working distance of 13 cm from lens to object.
Multilens binocular magnifiers
Multilens binocular magnifiers are referred to as binocular loupes, telescopic magnifiers, and surgical telescopes. They are available in magnifications ranging from 2× to 8× and are designed to provide a working distance of 25 to 40 cm. Their drawback is their significantly higher expense and limited field of view. However, the entire field is usually not distorted; thus, the nondistorted portion of the field of view approaches that of lesser-quality magnifiers. Some high-quality binocular loupes have a field of view larger than that of other brands; therefore one should compare many loupes prior to deciding which to purchase. These loupes are used exclusively in our practice and are recommended for both sclerotherapy and multiple surgical procedures.
N.Y.) loupe best suited for dermatologic examination. The working distance of this loupe is 35 cm for the 3.5× and 40 cm for the 2.5× magnifier. These magnifiers have the ocular structure secured to the lenses of the glass. The viewing angle is thus locked into position and can be customized only to the original operator’s posture. A disadvantage of this loupe system is a restriction of the peripheral vision to as little as 10%. This necessitates removing the loupes to view anything outside the working area.
3.5×, 4×, and 6× power (Fig. 15.9). The most useful power for sclerotherapy is the 2.5× model, which has a working distance of 34 cm with a field of view of 75 mm. The Gallilean optics are shorter than most other loupes and are lightweight (80 g). They are available on a large or small spectacle frame. Like many other loupes, the Heine loupe has both an asymmetric pupil distance adjustment and two alternate height settings for the optics.
the following advantages: optics that can flip up out of view when not needed, lightweight frames, and optics with an antireflection coating. The 2.5× magnification loupe (Fig. 15.10)
14
Epstein
found the Designs for Vision (Ronkonkoma,
Heine (Cary, N.C.) binocular loupes come in 2×, 2.5×,
The Keeler (Broomall, Pa.) panoramic surgical loupe has
Equipment
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