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*Breast Service, Department of Surgery, and
Department of Anesthesia, Memorial Sloan-Kettering Cancer Center, New York, New York
Address correspondence and reprint requests to Leslie L. Montgomery, MD, MSKCC-MRI 1026, 1275 York Ave., New York, NY 10021. Address e-mail to montgoml{at}mskcc.org
| Abstract |
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IMPLICATIONS: We report the largest single-institution review of adverse reactions to injection of isosulfan blue dye during sentinel lymph node mapping in breast cancer. Bronchospasm and respiratory compromise are unusual, and most patients can be treated with short-term pressor support. Patients with a sulfa allergy do not display a cross-sensitivity to isosulfan blue dye.
| Introduction |
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In the future, isosulfan blue dye will probably be given to a wider spectrum of patients as the indications for SLN biopsy broaden and as more physicians throughout this country and the world become familiar with the technique. There is extensive historical experience with vital dyes for lymphangiography, including patent blue dye and its 2,5-disulfonated isomer, isosulfan blue. Allergic and anaphylactic reactions to these dyes have been documented for decades. Despite this experience, many health care professionals are unaware of the incidence and potential severity of an allergic reaction to isosulfan blue dye.
We report our experience with adverse reactions to isosulfan blue dye during SLN mapping in breast cancer. Through a review of our SLN database, we describe the incidence, timing, and severity of these reactions.
| Methods |
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A total of 2464 SLN mapping procedures were performed during this time. All patients had signed informed consent for the procedure. Fifty patients had bilateral synchronous SLN mapping procedures and were recorded in the SLN database as two distinct mapping procedures. For the purposes of our study, we counted these patients only once, because isosulfan blue dye exposure occurred only once during surgery, even though it involved both breasts. Twenty-two patients were not given isosulfan blue dye. Therefore, the final population examined for isosulfan blue dye reactions comprised 2392 individual patients.
At MSKCC, most patients elect breast-conservation therapy and have the lumpectomy or reexcision and SLN biopsy performed under monitored sedation with local anesthetic. A combination of fentanyl, propofol, midazolam, lidocaine, and/or bupivacaine is routinely used in this setting. If a patient is undergoing a mastectomy or axillary lymph node dissection, general anesthesia is given.
The protocol and technique of SLN mapping and biopsy at MSKCC have been described previously (1). As part of the SLN mapping protocol, isosulfan blue dye (Lymphazurin 1%; Ben Venue Laboratories, Inc., Bedford, OH) is injected intraparenchymally into the breast tissue adjacent to the tumor or biopsy cavity. This injection is given in the operating room just before the surgical procedure.
| Results |
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Of the 39 reactive patients in our series, 27 patients (69%) had Grade 1 reactions. Three patients (8%) had Grade 2 reactions, and nine patients (23%) had Grade 3 reactions. Only two patients (one Grade 1 and one Grade 3 reaction) had hypoxia with oxygen saturation <90%, as determined by pulse oximetry (Nellcor Puritan Bennett, Inc., Pleasanton, CA). Only one patient (Grade 1 reaction) had wheezing. There were no deaths.
The time interval between the injection of isosulfan blue dye and the adverse reaction was documented in 35 patients. The mean was 44 min, and the median was 43 min. For Grade 1 reactions, the mean interval was 49 min (median, 46 min; range, 1205 min); for Grade 2 reactions, the mean was 28 min (range, 550 min); and for Grade 3 reactions, the mean interval was 35 min (median, 37 min; range, 5100 min).
Of the 18 patients with a clearly documented resolution of symptoms, the mean duration was 202 min (median, 143 min; range, 15600 min). The most severe Grade 3 reaction required 10 h of pressor support. During that time, the patient was alert and communicative. She exhibited no respiratory compromise and at no time required intubation.
The mean volume of dye injected for the total SLN database was 3.9 mL (range, 0.110 mL). The mean volume of dye injected into patients who had a blue dye reaction during SLN biopsy was 4.0 mL (range, 25 mL). The mean volume of dye injected into patients with a Grade 3 reaction was 3.7 mL (range, 35 mL). The difference in injected dye volume between the Reactive and Nonreactive groups was not statistically significant (Students t-test and Wilcoxons ranked sum test).
Fifty patients had bilateral synchronous SLN mapping procedures; a mean volume of 6.5 mL of blue dye (range, 1.510 mL) was injected into these patients. No adverse dye reaction was reported in this group.
Thirty-two patients received isosulfan blue dye a second time, during a subsequent SLN mapping procedure performed for a metachronous contralateral breast cancer or as part of prophylactic surgery. No dye reaction occurred during these metachronous SLN mapping cases.
Fifteen patients who reported a sulfa allergy were not given isosulfan blue dye during the SLN biopsy procedure because of concerns regarding cross-sensitivity. Of the 2392 individual patients in the SLN database who received isosulfan blue dye, 195 (8%) had reported a sulfa allergy. Five of the 39 patients (13%) who had a dye reaction had reported a sulfa allergy. Thus, 2.6% (5 of 195) of patients who reported a sulfa allergy had an allergic reaction to isosulfan blue dye. This incidence is not statistically significantly different from the 1.5% (34 of 2197) incidence of blue dye reactions in patients with no sulfa allergy (Fishers exact test).
A combination of fentanyl, propofol, midazolam, lidocaine, and/or bupivacaine was used in 33 of the 39 reactive patients (85%). These patients did not require general anesthesia for definitive surgical treatment.
Forty-one percent (16 of 39) of the reactive patients received cefazolin before surgery, compared with 42% (978 of 2353) of nonreactive patients in the SLN database. Five percent (2 of 39) of reactive patients received clindamycin, compared with 8% (197 of 2353) of nonreactive patients. No allergic reactions were noted in patients receiving any other type of antibiotic. The remaining 21 reactive patients were among the 1191 patients who received no antibiotics. The incidence of allergic reactions was not significantly different between patients who received either cefazolin or clindamycin and patients who received neither antibiotic (Fishers exact test).
All patients received diphenhydramine, and the more severe cases also received corticosteroids. Only the nine patients with Grade 3 reactions were administered epinephrine.
| Discussion |
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Patent blue dye has been used in lymphangiography longer than isosulfan blue dye. Outside of the United States, it is used more frequently than isosulfan blue for SLN identification. The frequency of allergic reaction to patent blue dye has been estimated to be from 0.2% to 2.7% (46) (Table 1).
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Case reports of allergic reactions to patent blue dye during lymphangiogram (7,13,14), and even during topical use (3,15), continue to be published. Whereas urticaria, pruritus, mucocutaneous edema, and hypotension are routinely described, bronchospasm is usually absent, but it does occasionally occur (7). Anaphylaxis to patent blue dye has also been reported (as case reports) in SLN biopsy procedures (16).
In 1982, isosulfan blue dye was approved by the Food and Drug Administration for lymphatic mapping (9). It is the only triphenylmethane dye that is approved in the United States for SLN mapping. The package insert for Lymphazurin 1% reports "a 1.5% incidence of adverse reactions. All the reactions were of an allergic type" (17).
In 1982, Hirsch et al. (9) reported a Phase III clinical trial involving isosulfan blue dye for lymphangiography. Five of 543 patients (0.9%) studied had a relatively minor allergic reaction within 15 minutes of administration of isosulfan blue dye, and all five patients recovered in one hour or less with minimal or no symptomatic therapy.
The first case of anaphylactic shock after subcutaneous injection of 0.5 mL of isosulfan blue 1% was reported by Longnecker et al. (18) in 1985. Lyew et al. (19) described an anaphylactic reaction to isosulfan blue 1% during an SLN biopsy procedure for breast cancer. The hypotension resolved after 15 minutes, and the procedure was completed. The facial swelling resolved approximately 18 hours after the event. Leong et al. (10) reported 3 cases (0.7%) of anaphylaxis after intradermal injection with isosulfan blue dye in 406 patients undergoing intraoperative lymphatic mapping for melanoma. Albo et al. (11) reported their experience of 7 cases (1.1%) of hemodynamic instability requiring epinephrine after the administration of isosulfan blue dye for SLN mapping in a series of 639 breast cancer patients.
The incidence of allergic reactions involving isosulfan blue dye in our series was 1.6%. The incidence of hypotensive reactions was 0.5%. Most reactions (69%) produced urticaria, blue hives, a generalized rash, or pruritus. Severe hypotensive reactions were rapidly responsive to antihistamines, corticosteroids, and epinephrine.
Respiratory compromise and bronchospasm were unusual manifestations of an allergic response to isosulfan blue dye in our series. Only one person (Grade 1 reaction) had wheezing, and two people (one Grade 1 reaction and one Grade 3 reaction) exhibited oxygen saturation <90%. Every patient in our series was successfully extubated at the conclusion of the case or had not required intubation at all. A number of new case reports of allergic reactions to isosulfan blue dye during SLN biopsy for melanoma (20) and breast cancer (21,22) have been recently published. In all of these reports, patients manifested urticaria with or without hypotension. None developed respiratory symptoms or required intubation.
There is inherent bias in our observation that Grade 1 reactions occur later than Grade 3 reactions (mean time, 49 and 35 minutes, respectively). Operating room staff will immediately notice the profound hypotension definitive of a Grade 3 reaction, whereas the urticaria or hives that characterize a Grade 1 reaction are often noted only on removal of the drapes at the end of the operation. As in our study, Leong et al. (10) and Albo et al. (11) noted a significant time delay (15 to 30 minutes) from dye injection to allergic reaction. It has been hypothesized that this phenomenon is due to the introduction of the antigen via an intradermal rather than an IV route (10).
It is often difficult to determine the causative agent of anaphylaxis in the absence of confirmatory testing. In many reports in the literature, the patients subsequently tested negative to the local anesthetics, which, when used at all, had been administered concomitantly (2,47). None of our patients underwent any of the known confirmatory tests: 1) analysis of biochemical levels of plasma histamine, plasma tryptase, or urine methyhistamine performed at the time of reaction; 2) skin-prick testing with the suspected agents; or 3) evaluation of radioimmunoassay or enzyme-linked immunoassay for drug-specific immunoglobulin E serum antibodies (10). Because of the temporal relationship between the dye injection and the reaction, we infer that isosulfan blue dye is the most probable cause of the allergic clinical response. With the exception of lidocaine, any other medication given was administered IV and earlier in the course of the operation.
Because isosulfan blue dye is the 2,5-disulfonated isomer of patent blue dye, pharmacy and operating room staff have raised concerns regarding possible cross-sensitivity in patients who report a sulfa allergy. Our data show that the sulfa allergy status of a patient has no effect on that patients likelihood of experiencing an allergic reaction to isosulfan blue dye. Only 2.6% of patients who reported an allergy to sulfa drugs experienced an allergic reaction, and this incidence was not statistically significantly different from the incidence of allergic reactions in patients with no reported sulfa allergy.
Isosulfan blue dye is safe for use in SLN mapping in breast cancer. It may be used in patients with a reported allergy to sulfa drugs, as well as in patients who have had previous exposure to this dye. This article highlights the need to suspect anaphylaxis when hemodynamic instability occurs after the injection of isosulfan blue dye. Discussion of the possible complication of an allergic reaction to isosulfan blue dye should be part of the preoperative consent process.
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