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Acrodynia
Acrodynia
Acrodynia
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Acrodynia
Other namesBilderbeck's, Selter's, Swift's and Swift-Feer disease.
SpecialtyEmergency medicine Edit this on Wikidata

Acrodynia is a medical condition which occurs due to mercury poisoning. The condition of pain and dusky pink discoloration in the hands and feet is due to exposure or ingesting of mercury. It was known as pink disease (due to these symptoms) before it was accepted that it was just mercury poisoning.[1] The word acrodynia is derived from the Greek: ακρος, which means end or extremity, and Greek: οδυνη, which means pain. As such, it might be (erroneously) used to indicate that a patient has pain in the hands or feet. The condition is known by various other names including hydrargyria, mercurialism, erythredema, erythredema polyneuropathy, Bilderbeck's, Selter's, Swift's and Swift-Feer disease.

Symptoms and signs

[edit]

Besides peripheral neuropathy (presenting as paresthesia or itching, burning or pain) and discoloration, swelling (edema) and desquamation may occur. Since mercury blocks the degradation pathway of catecholamines, epinephrine excess causes profuse sweating (diaphora), tachycardia, salivation and elevated blood pressure. Mercury is suggested to inactivate S-adenosyl-methionine, which is necessary for catecholamine catabolism by catechol-o-methyl transferase. Affected children may show red cheeks and nose, red (erythematous) lips, loss of hair, teeth, and nails, transient rashes, hypotonia and photophobia. Other symptoms may include kidney dysfunction (e.g. Fanconi syndrome) or neuropsychiatric symptoms (emotional lability, memory impairment, insomnia).[citation needed]

Thus, the clinical presentation may resemble pheochromocytoma or Kawasaki disease.[citation needed]

There is some evidence that the same mercury poisoning may predispose to Young's syndrome (men with bronchiectasis and low sperm count).[2]

Causes

[edit]

Mercury compounds like calomel were historically used for various medical purposes: as laxatives, diuretics, antiseptics or antimicrobial drugs for syphilis, typhus and yellow fever.[3] Teething powders were a widespread source of mercury poisoning until the recognition of mercury toxicity in the 1940s.[4]

However, mercury poisoning and acrodynia still exist today.[5] Modern sources of mercury intoxication include broken thermometers.[6]

Diagnosis

[edit]

Removal of the inciting agent is the goal of treatment. Correcting fluid and electrolyte losses and rectifying any nutritional imbalances (vitamin-rich diets, vitamin-B complex) are of utmost importance in the treatment of the disease.[citation needed]

The chelating agent meso 2,3-dimercaptosuccinic acid has been shown to be the preferred treatment modality. It can almost completely prevent methylmercury uptake by erythrocytes and hepatocytes. In the past, dimercaprol (British antilewisite; 2,3-dimer-capto-l-propanol) and D-penicillamine were the most popular treatment modalities. Disodium edetate (Versene) was also used. Neither disodium edetate nor British antilewisite has proven reliable. British antilewisite has now been shown to increase CNS levels and exacerbate toxicity. N -acetyl-penicillamine has been successfully given to patients with mercury-induced neuropathies and chronic toxicity, although it is not approved for such uses. It has a less favorable adverse effect profile than meso 2,3-dimercaptosuccinic acid. [citation needed]

Hemodialysis with and without the addition of L-cysteine as a chelating agent has been used in some patients experiencing acute kidney injury from mercury toxicity. Peritoneal dialysis and plasma exchange also may be of benefit.[citation needed]

Tolazoline (Priscoline) has been shown to offer symptomatic relief from sympathetic overactivity. Antibiotics are necessary when massive hyperhidrosis, which may rapidly lead to miliaria rubra, is present.[citation needed] This can easily progress to bacterial secondary infection with a tendency for ulcerating pyoderma.[citation needed]

References

[edit]
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Acrodynia

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Acrodynia, also known as pink disease, is a rare and historically significant form of chronic that primarily affects infants and young children, characterized by painful pink-to-red discoloration, , and of the hands and feet, often accompanied by systemic symptoms such as , , excessive sweating, and . The condition arises from exposure to elemental, inorganic, or organic mercury compounds, with historical cases frequently linked to the use of mercury-containing teething powders like (mercurous chloride) in the early . Other sources of exposure have included household mercury spills, contaminated sphygmomanometers, and environmental from products such as paints or adhesives. Children are particularly susceptible due to their higher absorption rates and immature detoxification systems, leading to accumulation of mercury in tissues. Clinically, acrodynia presents with a distinctive and peeling on the extremities, alongside neurological and autonomic effects including , anorexia, muscle , , , and oral manifestations like excessive salivation and premature . Additional features may involve alopecia, cold intolerance, tremors, and , which can mimic other conditions such as or , complicating diagnosis. Epidemics of acrodynia occurred widely before the and , when regulatory bans on mercury in consumer products drastically reduced incidence, making it now an uncommon disorder primarily reported in case studies of accidental exposures. During peak periods, it affected approximately 1 in 500 children under age 5 in some populations, underscoring the impact of unregulated mercury use. Diagnosis relies on a history of potential mercury exposure combined with elevated urinary or blood mercury levels, often confirmed through clinical presentation rather than routine screening. Treatment focuses on immediate removal of the exposure source and supportive care, including with agents like DMSA to enhance mercury excretion, which has shown effectiveness in reducing levels and alleviating symptoms in documented cases. Prevention emphasizes avoiding mercury-containing products and prompt remediation of spills, highlighting the importance of public awareness to eliminate residual risks.

Background and History

Definition and Etymology

Acrodynia is a rare associated with chronic , primarily affecting infants and young children. It manifests as an idiosyncratic reaction to mercury exposure, featuring painful extremities and a distinctive discoloration of the hands, feet, and tip, along with systemic effects such as and excessive sweating. The name acrodynia originates from the Greek terms akron (extremity) and odyne (pain), literally translating to "painful extremities," reflecting its hallmark dermatological and neurological features. It is also commonly known as pink disease, owing to the erythematous on the extremities, and has been historically designated by eponyms including Swift's , Feer's (or Feer ), and Bilderbeck's . In distinction from broader mercury toxicity, acrodynia occurs as a response in a small subset of exposed individuals, estimated at about 1 in 500 children subjected to mercury, such as through powders containing . This selective susceptibility suggests underlying genetic or immune factors that predispose certain children to the syndrome despite widespread exposure.

Historical Context

Acrodynia, also known as pink disease, was first described in the medical literature during the 19th century, with early reports emerging in the 1820s and 1830s as a mysterious condition affecting infants and young children characterized by painful extremities and skin changes. By the early 20th century, major outbreaks occurred across Europe, North America, and Australia, primarily linked to chronic exposure to mercury from calomel (mercurous chloride)-containing teething powders routinely administered to teething infants. These powders, marketed as remedies for teething discomfort, were widely used in households, leading to widespread intoxication among vulnerable young populations in these regions during the 1920s and 1930s. The of acrodynia remained elusive for decades, baffling clinicians until the 1940s when it was recognized as a form of . In 1948, American pediatrician Josef Warkany and colleagues proposed that the syndrome resulted from chronic mercury ingestion, particularly from powders, based on clinical observations and chemical analyses of affected children. Concurrently, Swiss physician Guido Fanconi reported similar findings in European cases, confirming mercury as the causative agent through urinary excretion studies and histopathological evidence. This breakthrough prompted investigations into consumer products, revealing high mercury levels in powders and other remedies. The identification of mercury's role led to swift regulatory actions, culminating in bans on mercury in powders and related consumer goods by the early . In the , deaths from acrodynia peaked at 585 between 1939 and 1948 but plummeted to just 7 by 1955 following the withdrawal of from formulations and campaigns. Comparable declines were observed in the United States and , where similar prohibitions and awareness efforts virtually eradicated the disease by the mid-1950s, marking the end of large-scale epidemics.

Epidemiology

Incidence and Prevalence

Acrodynia, also known as pink disease, was historically prevalent in industrialized nations prior to the 1950s, primarily due to chronic mercury exposure from teething powders containing calomel (mercurous chloride). It affected approximately 1 in 500 children exposed to these products, leading to thousands of cases across the and during the 1920s to 1950s. In the , for instance, early 1950s data from one indicated that acrodynia accounted for 3.6% of pediatric admissions, underscoring its significant burden before regulatory bans on mercury-based aids. Following the discontinuation of mercury-containing teething powders in the mid-1950s, acrodynia became extremely rare worldwide, with incidence dropping dramatically due to stricter regulations on mercury use in consumer products. Acrodynia is now extremely rare worldwide, with only sporadic case reports, primarily from accidental exposures in both developed and developing regions. Recent case reports as of 2025 describe instances from household mercury spills and broken devices, indicating persistent low-level risks despite regulations. Demographically, acrodynia almost exclusively impacts children under 5 years of age, with the majority of cases in infants and toddlers during periods of or similar developmental stages. There is no gender predominance, as cases occur equally among boys and girls, and no strong racial or ethnic predisposition has been identified.

Risk Factors

The primary for acrodynia is chronic low-level exposure to inorganic mercury in infants and young children, often through inadvertent ingestion or absorption from sources such as powders containing , laxatives, or broken thermometers. This form of mercury, including elemental quicksilver and its inorganic salts, accumulates over time and triggers the condition in susceptible individuals, particularly those under two years of age whose developing systems are more vulnerable to . Certain children exhibit a genetic or to mercury, possibly involving variations in that heighten susceptibility to even minimal exposures. Environmental factors contributing to acrodynia include residence in regions with artisanal small-scale (ASGM), where communities, especially children, are exposed to volatilized mercury from processing. The incidence of acrodynia has declined sharply following mid-20th-century regulations banning mercury in consumer products.

Pathophysiology

Mercury Toxicity Mechanisms

Mercury exhibits a high affinity for sulfhydryl (-SH) groups found in proteins and enzymes, forming stable covalent bonds that disrupt their function. This binding particularly affects enzymes involved in , such as those in the mitochondrial , and protein synthesis pathways, leading to impaired energy production and metabolic dysfunction. For instance, mercury inhibits sulfhydryl-containing enzymes like Na⁺-K⁺ ATPase, which is crucial for maintaining cellular ion gradients and . Inorganic mercury compounds, often the form implicated in acrodynia from historical exposures like in powders, undergo bioaccumulation primarily in the kidneys, , and due to their persistence in tissues. Children are particularly susceptible owing to higher gastrointestinal absorption rates and immature hepatic and renal systems that limit effective detoxification and excretion of mercury. In acrodynia, mercury's selective toxicity targets peripheral nerves and skin through mechanisms involving and . Mercury induces the generation of (ROS), overwhelming defenses and leading to oxidative damage in neuronal and epidermal cells, which contributes to neuropathy. Concurrently, disrupts cell membrane integrity in these tissues, promoting and further inflammatory cascades specific to the condition.

Immune and Sympathetic Involvement

Acrodynia involves a reaction to mercury, primarily manifesting as a delayed-type (type IV) . Mercury, excreted through sweat glands, accumulates in acral areas such as the hands and feet, triggering T-cell mediated activation and subsequent release, such as interleukin-1β (IL-1β) and IL-18, which contribute to localized , allergic , and . This immune cascade is exacerbated in genetically susceptible individuals, where even low-level chronic exposure leads to systemic immunotoxicity, including suppressed immunoreactivity alongside phenomena. Sympathetic overactivity plays a central role in acrodynia's autonomic manifestations, driven by mercury's interference with catecholamine metabolism. By inactivating (COMT), mercury elevates levels of epinephrine, norepinephrine, and , resulting in adrenocortical hyperfunction, , , and profuse sweating. This sympathetic dysfunction mimics pheochromocytoma-like symptoms, with reported cases showing blood pressures up to 160/120 mmHg alongside and . Long-term sequelae of acrodynia often include autoimmune complications due to persistent immune dysregulation from mercury exposure. Survivors may develop autoimmune diseases with elevated titers, alongside risks of (termed Young disease), , and permanent neurological deficits such as mental retardation. Descendants of affected individuals exhibit a higher prevalence of autism spectrum disorders, potentially linked to inherited and epigenetic changes.

Clinical Features

Symptoms

Acrodynia presents with a range of subjective symptoms primarily affecting the neurological, gastrointestinal, and behavioral domains in affected children. Patients commonly report , manifesting as heightened sensitivity to stimuli and frequent crying, alongside characterized by difficulty falling or staying asleep. , or aversion to light, often accompanies these, leading to discomfort in illuminated environments. Additionally, and burning pain in the extremities contribute to significant distress, with children describing tingling sensations and , fiery discomfort in the hands and feet. Gastrointestinal complaints are prominent, including anorexia with marked loss of appetite, that may precede , and excessive salivation, often perceived as uncontrollable . These symptoms can lead to and nutritional deficits if prolonged. Behavioral changes are equally characteristic, featuring with rapid mood swings from tearfulness to outbursts, expressed as withdrawal and indifference to surroundings, and overall despite . In children, these manifestations often result in social withdrawal and challenges in daily interactions.

Physical Examination Findings

Physical examination of patients with acrodynia typically reveals characteristic dermatological changes, particularly affecting the extremities and face. The palms, soles, and cheeks often exhibit pink-red papules and a dusky pink discoloration, accompanied by swelling and vesicular eruptions that progress to or peeling of the skin. Pruritus may lead to visible excoriations, lichenification, and secondary ulcerating from scratching, while the tips of the fingers, toes, and show prominent redness. The extremities may also appear bluish, cold, and clammy. Alopecia is commonly observed, along with degeneration of nails and teeth, including loose teeth and swollen gums. Rashes may appear as , scarlatiniform, or rubelliform exanthems with hemorrhagic puncta, and can involve the extremities. Systemic findings include cardiovascular abnormalities such as and . Neurological and muscular signs manifest as with decreased limb reflexes, generalized weakness, tremors, and particularly in the pelvic and pectoral girdles, sometimes resulting in a characteristic "salaam posture" where the child assumes a position with the head between the legs while rubbing the hands. Increased sweating () is evident, potentially contributing to signs of , and ocular examination may show , , or . In some cases, is noted alongside these features.

Diagnosis

History and Physical Evaluation

The evaluation of suspected acrodynia begins with a thorough to identify potential mercury exposure and associated clinical manifestations, particularly in infants and young children. Clinicians should inquire about recent or chronic sources of mercury, such as the use of powders containing (mercurous ), breakage of mercury-containing devices like thermometers or sphygmomanometers, or environmental exposures from contaminated , paints, or traditional medicines. A family of similar symptoms or shared exposures in the household may also raise suspicion, as mercury can disseminate through domestic environments. Additionally, assess for developmental delays, such as regression in motor skills or milestones, alongside nonspecific complaints like irritability, poor appetite, weight loss, and painful extremities. Physical examination prioritizes a systematic assessment to detect characteristic signs of mercury toxicity, focusing on autonomic, dermatologic, and neurologic features. should be monitored for instability, including and , which reflect sympathetic overactivity. Inspect the extremities for the hallmark "pink disease" appearance: puffy, erythematous, and painful hands and feet with possible peeling or of the skin, often accompanied by increased . Neurologic screening is essential, evaluating for , , or a characteristic "salaam" posture due to discomfort, while also checking for , , or . Red flags prompting urgent suspicion of acrodynia include the combination of pink discoloration of the extremities with behavioral changes, such as excessive or , in a under five years old, especially if linked to a plausible mercury exposure history. This clinical assessment integrates history and exam findings to guide further diagnostic steps, distinguishing acrodynia from other pediatric conditions through its unique pattern of symptoms.

Diagnostic Tests

Diagnosis of acrodynia relies on confirming mercury exposure through laboratory testing, as clinical features alone are nonspecific. The preferred method for assessing chronic mercury exposure, which underlies acrodynia, is measurement of mercury levels in , with a 24-hour collection providing the most accurate estimate or spot urine adjusted for concentration. mercury levels exceeding 20 mcg/L are indicative of significant exposure and support the of mercury toxicity, though levels above 300 mcg/L are more commonly associated with overt symptoms. mercury testing is useful for recent or acute exposure but less reliable for chronic cases like acrodynia, where levels may be below 10 mcg/dL even in symptomatic patients. can detect chronic exposure over months, reflecting cumulative intake, but results are prone to contamination and misinterpretation. Importantly, mercury concentrations in these tests do not directly correlate with the severity of acrodynia symptoms, as individual susceptibility varies widely. Supportive laboratory tests help evaluate organ involvement and confirm the type of mercury. Renal function tests, including (BUN) and serum creatinine, are essential to detect , a common complication of inorganic mercury exposure in acrodynia. A (CBC) may reveal due to gastrointestinal effects or from mercury. For , gas or thin-layer can differentiate organic from inorganic mercury, aiding in identifying the exposure source, though this is not always necessary for . Toxicology screening for other is recommended to rule out alternative causes. Imaging studies are rarely required for acrodynia but may be employed if of elemental mercury is suspected. Abdominal X-rays can visualize radiopaque mercury deposits in the , confirming oral exposure. Other , such as chest X-rays, is not routinely indicated unless pulmonary involvement is suspected from .

Management

Treatment Approaches

The primary treatment for acrodynia involves the immediate cessation of mercury exposure to prevent further accumulation of the toxin. This requires identifying and removing the source, such as contaminated powders, medications, or environmental hazards, followed by thorough decontamination of the affected areas. is the cornerstone of pharmacological management, aimed at enhancing the excretion of mercury through binding and urinary elimination. Succimer (2,3-dimercaptosuccinic acid, DMSA) is the first-line agent, approved by the FDA for treating in children, administered at a dose of 350 mg/m² orally or intravenously three times daily for five days, followed by twice daily for 14 days, with potential repetition after a two-week interval if mercury levels remain elevated. In severe cases, alternative chelators such as (British anti-Lewisite, BAL) or D-penicillamine may be considered, though their use is limited by potential risks. , administered intramuscularly at 2.5–3 mg/kg every 12–24 hours for 10 days, has been employed historically but is generally avoided due to the risk of redistributing mercury to the . D-penicillamine, dosed at 20–30 mg/kg/day orally in four divided doses, can be used as an adjunct but carries risks of and is ineffective against organic mercury forms. Throughout , close monitoring is essential, including serial measurements of blood, urine, and tissue mercury levels—preferably via 24-hour urine collections—to assess treatment efficacy and guide duration. Organ function, including , renal, and hepatic parameters, should be evaluated regularly to detect any adverse effects from . Supportive measures, such as ensuring adequate hydration, complement these approaches but are addressed separately.

Supportive Care

Supportive care in acrodynia focuses on alleviating symptoms, preventing complications, and supporting overall recovery while the body eliminates mercury. Symptomatic relief is essential, as patients often experience significant discomfort from pain, , and skin changes. Analgesics such as acetaminophen or ibuprofen are administered to manage extremity pain and , providing relief without interfering with mercury excretion. For , which can severely limit daily activities, dim lighting environments or protective eyewear like are recommended to reduce light sensitivity and improve comfort. Skin care involves the application of emollients and barrier creams to soothe and peeling, particularly on the hands and feet, helping to maintain skin integrity and prevent further irritation. Excessive sweating, a hallmark symptom, increases the risk of secondary bacterial infections such as or ; thus, frequent changes of clothing and hygiene measures are crucial, with antibiotics prescribed if infections develop. Nutritional support addresses common issues like anorexia and , which exacerbate the condition. A high-vitamin diet, rich in vitamins and other micronutrients, is advised to correct potential deficiencies and promote recovery, even though acrodynia is not primarily a nutritional disorder. Encouraging adequate caloric intake through small, frequent meals or supplements helps combat . Fluid and balance must be maintained, especially in cases of poor oral intake or from sweating; intravenous fluids may be necessary if hydration cannot be achieved orally. A multidisciplinary approach ensures comprehensive , involving pediatricians for overall monitoring, toxicologists for , and dermatologists for skin-specific interventions. This collaborative care facilitates regular follow-up, environmental source identification, and tailored support to minimize long-term effects. protocols, as detailed in treatment approaches, complement these measures but are not the focus of supportive care.

Prognosis and Prevention

Prognosis

Historically, acrodynia carried a significant mortality , with fatality rates ranging from 10% to 33% prior to the , largely attributable to delayed and lack of effective interventions. In the , following the recognition of mercury as the causative agent and the advent of prompt , mortality rates have become very low, rendering the condition rarely fatal when identified early. Recovery from acrodynia typically occurs over weeks to months after cessation of mercury exposure and initiation of treatment, with most acute symptoms resolving favorably. However, neurological deficits, such as mental retardation or persistent cognitive impairments, may linger in a subset of cases, particularly those involving prolonged or severe exposure. Long-term sequelae in survivors can include associated with (a condition involving obstructive , , and ), , and permanent neurological deficits. Additionally, a higher prevalence of autism spectrum disorder has been reported in grandchildren of survivors. Key factors influencing outcomes include the duration and intensity of mercury exposure, patient age (with older children faring better), and the timeliness of intervention; early discontinuation of exposure and significantly enhance .

Preventive Measures

Preventive measures for acrodynia focus primarily on minimizing mercury exposure in children, as the condition results from chronic with no known safe exposure level. Key strategies include regulatory interventions, public education, and targeted screening in vulnerable populations. Regulatory actions have significantly reduced mercury sources historically linked to acrodynia. In the mid-20th century, calomel-containing powders, a major cause of in infants, were withdrawn from markets in countries like in 1953 and banned by the U.S. FDA in 1948 following recognition of their role in outbreaks. The , adopted in 2013 and effective from 2017, mandates global phase-outs of mercury in products such as thermometers and sphygmomanometers by 2020 in signatory nations, aiming to eliminate manufacturing, import, and export. As of 2025, most parties have complied, though some exemptions persist. Although thimerosal (a mercury-containing ) was removed from most U.S. childhood by 2001 as a precautionary measure, it remains exempt from the Convention and is rarely used today. These bans contributed to the near-elimination of acrodynia cases post-1960s. Public education plays a crucial role in preventing household and dietary exposures. Parents should be informed about hazards like mercury in old latex paints (pre-1990s), broken fluorescent bulbs, or antique items, advising safe disposal and ventilation to avoid vapor . For diet, guidelines recommend that children and pregnant women limit intake of high-mercury (e.g., no more than 8-12 ounces weekly of low-mercury options like or canned light ) to reduce accumulation, as outlined by the EPA and FDA. Community programs, such as those from the WHO, emphasize these awareness efforts to protect young children, who are most susceptible due to higher absorption rates. In high-risk areas, such as communities near artisanal sites where mercury use is common, routine screening is essential for early detection. authorities recommend monitoring mercury levels in children via non-invasive tests like hair or , particularly in regions with known contamination, to identify and mitigate exposures promptly. Such programs, often integrated into , help prevent chronic poisoning in vulnerable populations.

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