Hydrofluoric acid burn management

Overview

Hydrofluoric acid (HF) is one of the strongest and most corrosive inorganic acids, widely used in glass etching, electronics and the petrochemical, plastic, and dye industries, as well as in domestic rust removers and cleaning solutions ^[2]. It differs from other acids because the fluoride ion readily penetrates skin and causes destruction of deep tissue layers and even bone, so HF injury is a unique chemical burn [2, 3]. Although chemically an acid, its corrosive properties have been described as similar to alkalis ^[74].

HF burns are uncommon but distinctive: they can present as visually mild wounds yet produce significant deep tissue injury and systemic toxicity through multiple mechanisms ^[9]. One report describes HF as a strongly corrosive, highly toxic mineral acid in which burns over 1% total body surface area (TBSA) from anhydrous HF can lead to deep tissue damage, hypocalcemia, poisoning, and even death ^[1]. In recent series HF has been characterized as one of the most common substances causing chemical burns and as the leading cause of death from chemical burns ^[1]. Within burn-center practice it is described as one of the most common chemical burns encountered and one that frequently engenders controversy in its management ^[40].

Epidemiology

HF exposure is predominantly occupational. In a 20-year poison-center survey, occupational exposure accounted for 80% of cases, with workers in the semiconductor (61%), cleaning (15%), and chemical or metal (13%) industries; most exposures were dermal (84%) ^[41]. In one ten-year chemical-burn series, acids caused 72% of chemical burns, with hydrofluoric and sulfuric acid together responsible for 51% ^[39]. An earlier industrial review found HF accounted for half of all acid burns ^[38]. Consumer products are a recurring source: car and truck wash products, rust removers, and aluminum brighteners commonly contain HF because it efficiently breaks down roadway matter ^[63].

Most cutaneous HF burns are small. A 15-year burn-center experience reported all-male patients with a mean burn size of 2.1 ± 1.5% TBSA and a mean hospital stay of 1.6 days, with the upper extremity involved in 83% ^[40]. A separate series of 42 HF patients found a median burn size of 1% TBSA, upper-limb involvement in 74%, surgery in 17%, and no deaths ^[42]. Among ingestions reported to the National Poison Data System, most exposures occurred in men and at the individual's own residence, and nearly half followed transfer of HF into a non-labeled secondary container ^[64].

Pathophysiology

HF injures tissue through two simultaneous mechanisms: corrosion from the hydrogen ion and toxicity from the fluoride ion ^[75]. Because HF is small and only partially dissociated (pKa 3.2), it penetrates deeply into human skin ^[4]. In a 70% HF human skin-explant model, diffusion began within the first minute at the epidermal surface, reached the basal layer after 2 minutes, and completely penetrated the skin within 5 minutes ^[4]. The fluoride ion interferes with calcium activity in cell membranes and calcium-dependent processes, which the literature links to severe pain and deep tissue destruction ^[3].

Once absorbed, fluoride chelates calcium and magnesium, depleting biologically active stores ^[53]. Studies report that systemic toxicity after significant dermal exposure includes rapid hypocalcemia and hyperkalemia leading to ventricular fibrillation ^[6]. One experimental study found that an HF skin burn produced systemic fluoride poisoning followed by hypocalcemia, parathyroid hormone hypersecretion, hyponatremia, hyperkalemia, and other electrolyte imbalances, with electrocardiographic changes including severe bradycardia ^[7]. Death has been attributed to the combined systemic effects of dissociated fluoride ions, including hypocalcemia, hypomagnesemia, hyperkalemia, and direct cardiotoxicity ^[5]. Recent transcriptomic work has additionally implicated ferroptosis and necroptosis pathways in the formation and progression of HF burn wounds ^[69].

Assessment

The literature emphasizes that the single most important initial step is recognizing that an HF burn has occurred ^[53]. Symptoms are characteristically out of proportion to the observed injury, and the extent of injury is described as directly related to the concentration, amount, and duration of exposure ^[8]. Concentrated HF may cause immediate pain, whereas dilute solutions may delay symptoms for many hours ^[8]. One case series reported symptom onset (pain, erythema, and edema) delayed 1 to 6 hours after exposure ^[8]. Some burns appear initially as only a slight wound yet evolve dramatically over hours; a reported case progressed from simple erythema to partial-thickness destruction and ulceration over several days [57, 58].

Sources describe serum electrolyte and electrocardiographic monitoring as central to evaluation of significant exposures ^[6]. One analysis found that ionized calcium was a far more sensitive marker than total serum calcium, with hypocalcemia detected in 60% of patients by ionized calcium versus 7.3% by total calcium; the same study reported electrocardiographic abnormalities including T-wave and ST-T changes, ventricular arrhythmias, and conduction block ^[54]. Urinary fluoride has been proposed as a tool for early diagnosis and severity grading, with levels peaking about 4 hours after injury and returning to normal by roughly 6 days ^[55]. An individual-participant-data meta-analysis identified a burned-TBSA cutoff of 2.38% as discriminating for systemic toxicity ^[56].

Management

Decontamination and first aid

Across the reported literature, immediate copious irrigation with water is the consistently endorsed first step [14, 13]. One controlled experimental study concluded that water rinsing followed by topical calcium remains the standard first-aid approach for skin HF exposure ^[14]. A retrospective analysis found that patients with immediate water lavage (within 10 minutes and continued at least 15 minutes) had far fewer burns progressing to full thickness (12.5% vs 63%) and shorter hospital stays (7.7 vs 20.5 days) ^[13]. A mini-review of decontamination fluids concluded that water is efficacious, widely available, and inexpensive, supporting it as the best decontaminating solution ^[13]. The amphoteric chelating solution Hexafluorine has been used at industrial sites, but a blind controlled study reported it trended toward worse outcomes than water plus topical calcium ^[14].

Topical and local calcium

Topical 2.5% calcium gluconate gel applied after rinsing is described as the cornerstone of local treatment, reducing pain and improving wound healing ^[16]. One occupational-medicine report described topical 2.5% gel, a 1% eye solution, and 2.5% to 3% nebulizer solutions as having improved treatment results ^[17]. One study reported that topical calcium gluconate was much more effective when started within 3 hours of injury and showed no benefit beyond 6 hours ^[60]. Because calcium and magnesium ions penetrate tissue poorly, the literature notes that topical application neutralizes fluoride only in superficial skin layers ^[15]. For skin with adequate soft tissue and for extensive burns, subcutaneous injection of calcium gluconate (commonly cited as 10% at 0.5 mL per cm² of burn) has been described to overcome this limitation ^[15]. An experimental study reported that subcutaneous injection of calcium or magnesium salts was more effective than conventional topical application, and that topical calcium gluconate combined with the penetration enhancer dimethyl sulfoxide was as effective as injection in reducing HF damage ^[77]. One large case series of minor burns managed all patients with calcium gluconate soaking alone, without subcutaneous or intra-arterial injections and without fatalities or significant electrolyte imbalance ^[48]. A laboratory study found that point-of-care mixing of calcium gels can yield non-viscous mixtures with calcium concentrations below the expected 2.5% ^[47].

Intra-arterial and regional calcium

For digital and distal-limb burns refractory to topical therapy, intra-arterial calcium infusion has been reported. One series treated 28 patients (38 extremities) who failed topical treatment with intra-arterial calcium and reported 100% complete healing ^[18]. An animal study found intra-arterial calcium injection produced earlier and more effective arrest of destruction, with better results the earlier it was given ^[3]. Regional intravenous calcium gluconate delivered by a Bier-block technique has also been reported to relieve pain when topical therapy fails ^[19]. The literature also raises a safety concern: several reports describe massive soft-tissue loss associated with intra-arterial infusion, leading some authors to reserve it for the most severe refractory cases ^[20].

Magnesium and adjuncts

Magnesium also forms an insoluble fluoride salt and has been described as less tissue-irritating than calcium ^[22]. In a rat study, high-dose intravenous magnesium sulfate reduced HF burn severity compared with conventional intradermal calcium gluconate ^[21]. Experimental and developmental adjuncts reported in the literature include epidermal growth factor, which outperformed calcium or magnesium in an animal model ^[66]; iontophoretic calcium delivery, which enhanced transdermal calcium transport ^[67]; and chitosan-based hydrogels providing sustained calcium release ^[68].

Systemic and critical-care therapy

For significant exposures, management is described as including serum electrolyte and electrocardiographic monitoring with aggressive repletion of calcium deficiency ^[6]. One severe case combined a 10% calcium gluconate bolus and continuous infusion with magnesium sulfate, followed by continuous renal replacement therapy and extracorporeal membrane oxygenation (ECMO) ^[24]. Hemodialysis has been reported as potentially lifesaving when standard management fails to control refractory ventricular fibrillation ^[25]. In a refractory case, veno-arterial ECMO was followed by cessation of malignant arrhythmias and full recovery ^[51]. Emergency-management reports for major exposures describe wound irrigation, subeschar calcium injection, monitored serum-calcium supplementation, and prompt wound excision ^[10]. Surgical measures reported in the literature include debridement, fasciotomy for digital injuries, nail removal when the nail bed is involved, and skin grafting [70, 71].

Complications

The most feared complications are systemic. Dermal exposure can produce hypocalcemia, hypomagnesemia, hyperkalemia, cardiac dysrhythmias, and death ^[5]. Multiple reports document fatal outcomes from small exposures: one patient died of intractable cardiac arrhythmia after a burn involving only 8% of body surface area ^[12], and death has been reported from as little as 2.5% body surface area when concentrated acid is involved ^[11]. A separate review noted that life-threatening electrolyte abnormalities can arise even from a small, highly concentrated burn ^[59]. Some sources report that ventricular dysrhythmias due to HF can persist despite correction of hypocalcemia and hyperkalemia, raising the possibility of direct cardiotoxicity independent of electrolyte derangement [49, 50]. One case of QT prolongation with recurrent ventricular tachyarrhythmia after a 44% TBSA 30% HF burn implicated both hypocalcemia and hypomagnesemia ^[52].

The risk of hypocalcemia has been reported as greatest when a large area of skin is exposed, and cutaneous necrosis has followed even home use of low-concentration HF ^[65]. Local complications include deep tissue injury damaging nerves, blood vessels, tendons, and bone ^[8]. Reflex sympathetic dystrophy has been reported as an uncommon hand complication ^[71]. Late deterioration is a recurring theme: one mild dermal exposure was followed by hypocalcemia, hypomagnesemia, hypokalemia, bradycardia, and asystole at 16 hours ^[62]. Hydrofluoric acid is also reported to cause life-threatening complications with seemingly minor exposures, and dermal exposures that look visually unimpressive may still have fatal outcomes ^[57].

Special Considerations

Ocular exposure. Ocular HF injury is described as extremely damaging, with damage attributed to combined pH and fluoride-ion toxicity affecting superficial and deep eye structures ^[28]. The literature reports that immediate single irrigation with water, normal saline, or isotonic magnesium chloride is the most effective therapy, and that extrapolating other skin-burn treatments to the eye is unacceptable because of their ocular toxicity [29, 28]. One report found Hexafluorine to be the safest and most effective agent for the eye ^[30]. In an ex vivo corneal model evaluated by optical coherence tomography, corneas rinsed with tap water or 1% calcium gluconate became opaque after rinsing stopped, whereas those decontaminated with Hexafluorine remained clear for 60 minutes ^[76].

Inhalation exposure. Inhalation injury from HF alone is reported as rare, but sources emphasize that systemic toxicity should be anticipated ^[36]. Nebulized calcium gluconate (5% by nebulizer) has been reported for inhalation injury ^[23]. After a mass HF spill, respiratory toxicity was reported to be successfully treated by calcium nebulizer ^[34]. Burning lithium-ion batteries are an emerging source: such fires emit hydrogen fluoride capable of causing severe inhalation injury, with reported cases including ARDS and death [36, 37].

Ingestion. HF ingestion is reported to have a very high mortality from rapid hypocalcemia and fatal arrhythmias ^[27]. One review noted that small ingested amounts can cause rapid systemic poisoning and death, with patients deteriorating precipitously after appearing well ^[27]. Sources describe upper-gastrointestinal endoscopy after ingestion, noting that gastrointestinal symptoms do not correlate with injury severity ^[26].

Pediatric exposure. Chemical burns from HF are reported as uncommon in the pediatric emergency department ^[57]. Reported pediatric cases include a 14-month-old child who suffered cardiac arrest with profound hypocalcemia and hyperfluoridemia ^[31], and two children with marked hypocalcemia and ventricular fibrillation after exposure to a fluoride-containing wheel cleaner ^[32].

Occupational and mass-casualty. A community HF release prompted evacuation of roughly 3,000 people, with reported symptoms of eye irritation, burning throat, headache, and shortness of breath ^[33]. A military report described three fatalities from hydrogen fluoride generated by a damaged vehicle fire-suppression system, with two later patients surviving after nebulized calcium and positive-pressure ventilation ^[35]. Several fatalities are attributed to inadequate on-scene first aid, and sources emphasize personal protective equipment and immediate first aid as central to preventing death [72, 73].

Outcomes

Outcomes are reported to hinge on speed of recognition and decontamination. One retrospective analysis found that adequate decontamination was associated with shorter length of stay (7.2 vs 16.2 days), lower mortality (9.5% vs 21%), and fewer skin grafts despite slightly larger burns ^[13]. A first-aid-network model that shortened time to calcium treatment was reported to shorten the duration of hypocalcemia and hypomagnesemia ^[61]. Most cutaneous HF burns are small and resolve without death; one 42-patient series recorded no deaths, and a 15-year experience reported no mortality with treatment focused on calcium gluconate gel and selective arterial infusion [42, 40]. Conversely, massive exposure carries a poor prognosis, and case reports document death within hours of extensive or concentrated exposure [1, 12]. Prompt treatment has been associated with relief of pain and satisfactory results, while treatment delay has been linked to permanent impairment ^[53].

Controversies and Evidence Gaps

The HF management literature is described as extensive but contradictory, with no coherent management policy emerging and no single universally accepted protocol [43, 45]. Much of the available treatment knowledge derives from case reports, small case series, animal studies, and anecdotal evidence ^[46]. Calcium gluconate has become the preferred agent for detoxifying the fluoride ion, but sources note that its efficacy rests mainly on anecdotal reports and poorly controlled studies ^[44].

Specific points of disagreement persist. The relative roles of topical, subcutaneous, intra-arterial, and regional intravenous calcium remain debated, and intra-arterial infusion carries reports of massive soft-tissue loss that lead some authors to restrict its use ^[20]. Whether calcium and magnesium fully account for systemic toxicity is unsettled, with some reports describing persistent dysrhythmias after electrolyte correction that suggest direct cardiotoxicity [49, 50]. Magnesium-based regimens have shown promise in animal models but are not established clinical treatments [21, 22]. Newer agents such as epidermal growth factor, iontophoretic calcium, and chitosan hydrogels are reported as experimental [66, 67, 68]. Practical preparation concerns have also been raised, including the finding that bedside-mixed calcium gels may contain less calcium than intended ^[47].

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