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  • The Internet Journal of Plastic Surgery
  • Volume 4
  • Number 2

Original Article

The use of the medicinal leech, Hirudo medicinalis, in the reconstructive plastic surgery

K Mumcuoglu, C Pidhorz, R Cohen, A Ofek, H Lipton

Keywords

free-tissue transfer, medicinal leech, replanted digits, vascular congestion

Citation

K Mumcuoglu, C Pidhorz, R Cohen, A Ofek, H Lipton. The use of the medicinal leech, Hirudo medicinalis, in the reconstructive plastic surgery. The Internet Journal of Plastic Surgery. 2006 Volume 4 Number 2.

Abstract

The medicinal leech, Hirudo medicinalis, is being used to salvage compromised microvascular free-tissue transfers, replanted digits, ears, lips and nasal tips due to venous congestion. Twenty-three patients, 8-79 years old presenting with venous congestion of revascularized or replanted fingers, free or local flaps were treated by leech therapy. Of the 15 fingers, 10 fingers were saved (4 out of 9 replanted fingers and 6 out of 6 revascularized fingers), while 17 out of 18 flaps were salvaged (3 out of 4 free flaps and all 14 island and random flaps). Fifteen patients received 1-13 units of packed blood cells (average 2.9). The patients with revascularized or replanted fingers were treated in average of 2.5 days and each finger was treated with an average of 5.7 leeches. The 15 patients with flaps were treated in average of 3.4 days and each flap was treated with an average of 9.2 leeches.

 

Introduction

In recent years, the medicinal leech, Hirudo medicinalis, has been used to aid salvage of compromised microvascular free-tissue transfers, replanted digits, ears, lips and nasal tips in the plastic surgery [1]. The survival of compromised, venous-congested tissues was improved by early application of leeches [2,3,4].

In July 2004, the FDA approved leeches as a medical device in the area of plastic and reconstructive surgery. A survey of all 62 plastic surgery units in the United Kingdom and the Republic of Ireland showed that the majority of these units use leeches post-operatively [1].

In Israel, most of the studies on leeches are about the anti-coagulant properties of the leech saliva [5, 6]. Eldor et al. [7] used this technique on 50 patients with congested skin flaps and in one patient with a reimplanted ear, as well as in 40 patients with post-phlebitic syndrome. In 52.5% of the patients the pain-relief was immediate and persisted for about three weeks while improved mobility was reported in 70% of them. Shenfeld [8] used leeches for the treatment of venous insufficiency in a replanted digit.

We report the use of leeches in 23 patients with venous congestion either after revascularized or replanted fingers or after flap reconstructions.

Patients and methods

Leeches

The medicinal leech, Hirudo medicinalis, was purchased from France (Ricerimpex SAS, Cardolle, France). The leeches were kept at 5-6 o C in de-chlorinated water, which was changed twice a week. At these conditions, leeches survive up to two years without feeding. One to two gram heavy leeches were used for all treatments, and they were kept at room temperature for 1/2 – 1 hr before being transferred to the skin of the patient.

Treatment procedure

The area to be exposed to leeches was cleaned with sterile distilled water. Leeches were placed on the region of the removed nail for fingers or on the darker spots when dealing with flaps. The animals normally started feeding immediately, although in rare cases the skin was punctured with a sterile needle so that oozing blood would stimulate the leeches to feed.

The leech was placed on a given spot of the skin using a 5 ml syringe. For this purpose, the plunger of the syringe was removed with the help of a scissor or scalpel. The leech was placed in the barrel of the syringe and the open proximal end of the syringe was placed on the area to be treated. When the leech started feeding the syringe was removed. Feeding lasted for 45-120 minutes, and during this time the leech was monitored by one of the authors or a nurse. After auto-detachment, the leeches were killed in 70% ethyl alcohol and were disposed of in bags for biological waste.

The bite area was cleaned every 3-4 hours with a gauze sponge soaked in physiological saline to remove any locally forming clot and with a heparin (5,000 U/ml) soaked gauze, to increase the time of blood oozing. One to 5 leeches were used for each session of treatment.

Patients

Twenty-three patients (14 male and 9 female), 8-79 years (average: 35.9 years) old with devascularized or amputated fingers, open wounds after accidents or surgical wounds after scar revision were treated in Hadassah Hospital in Jerusalem during the period of May 2003 and July 2006. Table 1 shows the characteristics of injury, type of treatment and results. Accordingly, 13 fingers on 8 patients were either revascularized (6) or replanted (7) while 18 flaps were performed on 15 patients: 4 free, 7 island and 7 random.

Leech therapy was initiated after failure of more conventional treatment protocol (warming, aspirin p.o., Rheomacrodex i.v., immobilization and elevation of the injured area, use of local heparin and vasodilators) to improve venous status. In obvious cases of early venous congestion (19 cases), treatment with leeches was initiated 1-5 days post-operatively, while in 4 cases venous congestion appeared in the second week and accordingly leech therapy began 7 to 12 days post-operatively. A written informed consent was obtained from each patient (or patient's parent) before hirudotherapy was initiated.

To prevent any complication with Aeromonas sp., which are symbiotic bacteria in the intestinal tract of the leech as well as in the water in which they are kept, patients were treated during each day of leech therapy with 500 mg of ciprofloxacin.

Results

Of the 13 fingers belonging to 8 patients who were treated by leech therapy, 10 fingers were saved (4 out of 7 replanted fingers and 6 out of 6 revascularized fingers). Out of 18 flaps in 15 patients treated by leeches, 17 were saved (3 out of 4 free flaps and all 14 island and random flaps). 15 patients needed blood transfusion and received 67 units of packed blood cells (average: 2.9/patient). The 8 patients with 13 revascularized or replanted fingers were treated in average of 3.2 days and each finger was treated with an average of 5.5 leeches. The 15 patients with 18 flaps were treated in average of 5.1 days and each flap was treated with an average of 13.3 leeches.Treatment was continued until angiogenesis was sufficient to restore effective venous drainage, which was subjectively appreciated by the improved color of the skin (Table 1).

Figure 1
Table 1: Details of the patients treated with leeches and outcome of the treatment

Case Report 1

A 44-year old male patient was admitted to the emergency room with an avulsion of the pulps of the 4 fingers of his dominant hand (Fig. 1). The exposed distal phalanxes were covered with 4 digital island flaps (2 reversed and 2 direct) (Fig. 2 and 3). Venous congestion was seen one day post-operatively and leech therapy was initiated. Leeches were applied once daily for 3 days until the venous congestion was improved. Two months post-operatively the patient regained full function of his fingers/hand (Fig. 4) including a normal handwriting, allowing him to go back to his work as a schoolteacher.

Figure 2
Figure 1: Pulp loss of all 4 fingers of the right dominant with exposure of the distal phalanxes.

Figure 3
Figure 2: After marking the digital nerve, an island digital flap (distally based) is raised and moved to position. The arterial blood supply of the flap comes from the digital artery while the venous drainage is ensured by its venae comitantes.

Figure 4
Figure 3: Appearance of the hand at the end of the procedure: finger 2 and 4 tips are covered by reversed (distally based) digital flaps, while finger 3 and 5 tips are covered by direct (proximally based) digital flaps.

Figure 5
Figure 4: Aspect of the pulps and of the donor site at 3 months.

Case Report 2

An eight year old girl was admitted to the Emergency room with amputation of the pulp of the right dominant thumb, after a door was closed on her thumb 2 hours earlier(Fig. 5). The pulp was sutured back to the right thumb in the ER as a composite flap, but underwent gradual necrosis during the next 10 days with exposure of most of its distal phalanx.

To avoid skeletal shortening, a thumb reconstruction was performed, using a free flap taken from the lateral hemipulp of the ipsilateral big toe (Figs. 6 and 7). The free hemipulp flap was congested on post-operative day two, and it was treated with 1 leech daily for post-operative days two, three and four (Fig. 8). Under this treatment regimen, the flap congestion resolved, and the patient was discharged with a viable flap on post-operative day eleven. At 6 months, the function and sensory function of the thumb was normal (Fig. 9) allowing a normal handwriting.

Figure 6
Figure 5: Pulp loss of the right dominant thumb with exposure of the distal phalanx.

Figure 7
Figure 6: Free flap is raised from the lateral hemipulp of the homolateral big toe, based on the pedis artery. The venous drainage is insured by its venae comitantes.

Figure 8
Figure 7: Suture of the pedicle at the basis of 1 web (pedis artery sutured to a branch of the radial artery, 2 comitantes veins sutured to 2 superficial veins). Appearance of the thumb at the end of the procedure.

Figure 9
Figure 8: The leech is placed on the flap using the barrel of the syringe which plunger has been cut off. When the leech starts feeding, the syringe is removed.

Figure 10
Figure 9: Aspect of the thumb and of the donor site at 1 year.

Discussion

Leeches are generally used during the critical post-operative period when venous outflow cannot match the arterial inflow. This happens most commonly with replanted and revascularized digits as well as with vascularly compromised local and free flaps. Blood clot formation within the venous outflow could lead to venous congestion, clinically identified by the dusky purple appearance of the skin. If this complication is not corrected, cell death may result and the flap or finger may be lost. Accordingly, leech therapy is used until angiogenesis gradually improves the physiological venous drainage [9].

During feeding, leeches ingest approximately 5 ml of blood. Due to the anticoagulant- and vasodilator-containing saliva, the wound oozes up to 50 ml of blood within 24-48 hrs. The leach saliva contains coagulation inhibitors (hirudin, factor Xa inhibitor and bdellin), a platelet aggregation inhibitor (apyrase), a vasodilator (histamine) and collagenase and hyaluronidase, which facilitate local infiltration of the antithrombotic mediators into the congested tissue. Thus, leech therapy addresses both the venous outflow and microcirculation [5, 6, 10].

Successful salvage of tissue with leeches occurs in 70-80% of cases [3]. In the present study, 44.4% of the replanted fingers, all revascularized fingers and 94.4% of all flaps was salvaged by leech therapy. Four out of 5 fingers that were lost were pre-operatively mismanaged before arrival at our institution (direct contact with ice or plain water), while the fifth finger was severely injured by a grinder. The only flap failure (free flap) could be explained by its placement in an irradiated area, which prevented the angiogenesis.

Leech therapy is used daily until venous capillary return is established across the wound border by angiogenesis. In the present study, the treatment with leeches lasted on average of 2.5 days for fingers and 3.5 days for the flaps. In other clinical studies, the treatment lasted for 4-6 days [11,12,13,14]. In fact, the decision regarding the duration of the leech treatment is entirely empiric based on subjective appreciation of the color of the skin, capillary refill, and the color of bleeding to pinprick.

No significant adverse reactions were observed in any of the patients treated with leeches in this study. A few patients reacted with revulsion when they first heard about this treatment modality; however, none of the patients refused the treatment with leeches.

No side effects due to leach therapy were observed. The antibiotic prophylaxis with 500 mg of ciprofloxacin for Aeromonas infections appears appropriate. Symbiotic bacteria (Aeromonas sp.) living in the intestinal tract of the leech may cause infections in 4-20% of the patients and therefore a prophylactic treatment with antibiotics is justified. In case of Aeromonas infections, the rate of salvage drops to 30% or less [15,16,17]. Aeromonas species are sensitive to second- and third-generation cephalosporins, ciprofloxacin, sulfamethoxazone-trimethoprim, tetracycline and aminoglycosides [7].

In the post-operative period, all our patients received treatment to reduce blood viscosity and coagulation. The decongestive benefit to the flap or digit comes not only from the initial amount of blood extracted (approximately 5 ml), but from the 50 ml of additional blood loss that typically occurs as a slow ooze over the next 24-48 hrs [18].

The excess bleeding can be of concern and transfusions may be needed. In the present study, 15 out of 23 patients needed blood transfusion and received 67 units of packed blood cells (average: 2.9). Four to 6 units of packet blood cells were used in reports by other authors [3, 14]. Therefore, special care should be taken in patients with a tendency to hemorrhage, severe anemia or for those taking anticoagulants or platelet-inhibitor drugs [7].

In conclusion, leech therapy should be considered as an integral part of the armamentarium used in reconstructive surgery. It improves greatly the success rate of the surgery in cases of post-operative venous congestions, allowing blood drainage until angiogenesis is established.

Correspondence to

Dr. Kosta Y. Mumcuoglu, Department of Parasitology, Hebrew University-Hadassah Medical School, P.O.Box 12272, Jerusalem 91120, Israel Tel.: ++972 2 675-8093, Fax: ++972 2 675-7425, E-mail: kostam@cc.huji.ac.il

References

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Author Information

Kosta Y. Mumcuoglu, Ph.D.
Department of Parasitology, Hebrew University-Hadassah Medical School

Carole Pidhorz, MD
Hand and Microsurgery Unit, Department of Plastic Surgery, Hadassah Medical Center

Rivka Cohen, BA
Department of Parasitology, Hebrew University-Hadassah Medical School

Andre Ofek, MD
Hand and Microsurgery Unit, Department of Plastic Surgery, Hadassah Medical Center

Howard A. Lipton, MD
Hand and Microsurgery Unit, Department of Plastic Surgery, Hadassah Medical Center

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