Pathophysiology of spider bites

The pathophysiology of a spider bite is due to the effect of its venom. A spider envenomation occurs whenever a spider injects venom into the skin. Not all spider bites inject venom – a dry bite, and the amount of venom injected can vary based on the type of spider and the circumstances of the encounter. The mechanical injury from a spider bite is not a serious concern for humans. Some spider bites do leave a large enough wound that infection may be a concern. However, it is generally the toxicity of spider venom that poses the most risk to human beings; several spiders are known to have venom that can cause injury to humans in the amounts that a spider will typically inject when biting.

Only a small percentage of species have bites that pose a danger to people. Many spiders do not have mouthparts capable of penetrating human skin. While venoms are by definition toxic substances, most spiders do not have venom that is toxic to humans (in the quantities delivered) to require medical attention. Of those that do, fatal outcomes are rare.[1][2]

Spider venoms work on one of two fundamental principles; they are either neurotoxic (impairing the nervous system) or necrotic (dissolving tissues surrounding the bite). In some cases, the venom targets vital organs and systems.

Neurotoxic venom

Spiders paralyze prey with neurotoxic venom of some sort. A few have a venom that cross reacts with mammalian nervous system, though the specific manner in which the nervous system is attacked varies from spider to spider.[3][4][5]

  • Widow spider venom contains components known as latrotoxins, which cause the massive release of the neurotransmitters causing muscle contractions, sweating, and gooseflesh. This can affect the body in several ways, including causing painful abdominal cramps[6]
  • The atracotoxins of Australian funnel-web spiders work by opening sodium channels, causing excessive neural activity including strange sensations (paresthesias), muscle contractions, unstable blood pressure (hypertension or hypotension). The venom may cause fluid to accumulate in the lungs (pulmonary edema) that can be fatal.
  • The venom of Brazilian wandering spiders is also a potent neurotoxin, which attacks multiple types of ion channels.[7] Principally generating severe pain that travels up the limb, autonomic effects, including painful erections, occur with moderate envenomation. With severe envenomation heart and lung failure can result in death. In addition, the venom contains high levels of serotonin, making an envenomation by this species particularly painful.

Necrotic venom

Spiders known to have necrotic venom occur most notoriously in the family Sicariidae, which includes both the recluse spiders and the six-eyed sand spiders in the genus Hexophthalma and Sicarius. Spiders in this family possess a known dermonecrotic agent sphingomyelinase D,[8][9] which is otherwise found only in a few pathogenic bacteria.[10][11] Bites by spiders in this family can produce symptoms ranging from minor localized effects, to severe dermonecrotic lesions, up to and including severe systemic reactions including renal failure, and in some cases, death.[12] Even in the absence of systemic effects, serious bites from sicariid spiders may form a necrotising ulcer that destroys soft tissue and may take months and very rarely years to heal, leaving deep scars. The damaged tissue may become gangrenous and eventually slough away. Initially there may be no pain from a bite, but over time the wound may grow to 10 inches (25 cm) in extreme cases. Bites usually become painful and itchy within two to eight hours, pain and other local effects worsen 12 to 36 hours after the bite, and then necrosis will develop over the next few days.[13]

Systemic effects are unusual but include mild nausea, vomiting, fever, rashes, and muscle and joint pain. Rarely, more severe symptoms occur including red blood cell destruction (hemolysis), low platelets (thrombocytopenia), and loss of clotting factors (disseminated intravascular coagulation).[14] Children may be more susceptible to systemic loxoscelism effects. Deaths have been reported for both the brown recluse and the related South American species Loxosceles laeta and Loxosceles intermedia related to hemolysis and the injury that results to the kidney. Deaths attributed to brown recluse where no brown recluse live, highlight misdiagnosis and misconception[15]

Numerous other spiders have been associated with necrotic bites. The white tailed spider (Lampona spp.) had been suspected in necrotic lesions for decades only to be exonerated by the first extensive review.[16] An early report Sac spider causing necrosis has been frequently referenced.[17] Recent surveys doubt the incidence of necrosis.[18] Necrosis from Hobo spider, a member grass spider family Agelenidae, bite is under the same debate and doubt.[19][20]

Differential diagnosis

The skin manifestations of recluse venom are thought to arise from Sphingomyelinase D. The enzyme acts on cell membranes. The action is therefore limited as the venom can only spread through a set area. The originally red swollen area becomes a dry black ulcer. Skin infections, in particular the widespread methicillin-resistant Staphylococcal aureus, remain swollen and red.[21] Pus forms and the lesion often drains. It can continue to spread and expand as the bacteria grow. Other skin lesions and infections are much more common than spider bites. Physicians have reported brown recluse spider bites where no brown recluse exist.[22] Ed: in 100 pictures retrieved online only 3 were consistent with Sphingomyelinase pathophysiology.

Incidence of severe envenomation

Despite public concern about spider bites, severe envenomation is rare. Few spiders have toxins in sufficient volume to harm people. Of those that do, some have limited habitats. Spider behavior may be caused by limited human interaction. Spider defense against predators include camouflage, and escape by falling or running.[23] Biting is a last resort and the amount of venom injected varies greatly. Spider venom toxicity can be evaluated in experimental animals, or reported from accidental bites. Different experimental animals have different reactions to the same venom. The dose that is lethal to half of the animals poisoned is the LD50 and those values for mice is below. The LD50 of many poisons is known for humans but not that of spider venom.[citation needed]

Serious bites develop symptoms quickly, within the hour. While a serious medical condition may result (see latrodectims and loxocelism) fatalities are exceedingly rare. Appropriate medical treatment can improve speed of recovery. The scenario given in movies such as Arachnophobia, where bite victims die within minutes, does not occur. Small children are considered an exception because the amount of venom dispersed throughout the body is many times the concentration in an adult. There is at least one recorded case of a small child dying within 15 minutes of a bite from a Sydney funnel-web spider; that death occurred before the development of an antivenom. Since the antivenom was developed there have been no fatalities due to this species.

The neurotoxic venoms of the Sydney funnel-web spider and the Brazilian wandering spider are both known to have lethal complications. For the Brazilian wandering spider only 1 out of 200 bites is serious,[24] in part because they appear to be capable of biting without injecting venom.[25] Atrax robustus has a limited distribution and few bites are reported yearly.

The geographical range of the widow spiders is very great. As a result, far more people are exposed, worldwide, to widow bites than any other spider. Widow spiders bites are most often mild but may rarely cause serious complications in people. Fatalities had been reported as high as 5% of bites and as low as 0.2% of bites.[26]

Loxosceles live in areas of South America and the southern United States. There are populations of desert and Arizona recluse in the Western deserts of the United States,[27] but bites are rarely reported from these species. In established areas many spiders may populate the home. Even still the "reclusive" nature of the spider limits true bites.[28] More bites had been reported in Florida than recluses ever found in the area.[29]

Clinical presentation

Genus Species Common name Body length Venom amount LD-50 Alternate LD-50 Deaths reported
Atrax A. robustus Sydney funnel-web spider 24–32 mm.[30] 0.25 mg (F) and 0.81 mg (M) [31] 2 mg [32] 0.16 mg/kg [33] unknown 13 attributed deaths from 1927 to 1980[34]
Hadronyche H. formidabilis Northern tree funnel-web spider 23–45 mm. 1 death.[35] High rates of severe envenoming.[30][36]
Hadronyche H. cerberea Southern tree funnel-web spider High rates of severe envenoming.[36]
Latrodectus L. mactans Black widow 8–15 mm [30] 0.02–.03 mg.[37][38] 0.002 mg/kg [37]* 0.9 mg/kg 36 deaths recorded from 1965 to 1990 in the U.S.
5% of reported bites prior to antivenom availability [30]
Latrodectus L. tredecimguttatus Malmignatte (approx. same) (approx. same) 0.68 μg/kg [39] 16.25 μg/kg [39] possibility of deaths in Southern Europe first attributed to the brown recluse, suggesting larger frequency of the bites.
Loxosceles L. reclusa Brown recluse 1.2 cm (0.75 in) [30] 6–10 mm [30] .13–.27 mg.[39][40] necrosis and amputation of limbs more common, deaths rare[30]
Loxosceles L. intermedia 0.48 mg/kg [41] 0.34 mg/kg (SC)[42]
Loxosceles L. laeta Chilean recluse 1.45 mg/kg [41] High rates of severe envenomation.[43]
Loxosceles L. gaucho 0.74 mg/kg [41]
Phoneutria P. bahiensis Brazilian wandering spider 30 mm 1.079 mg [44] .00061–.00157 mg/kg [44] cardiac failure reported in 5 out of 12 bitten
Phoneutria P. boliviensis Brazilian wandering spider 30 mm 1.079 mg.[44] .00061–.00157 mg/kg [44]
Phoneutria P. fera Brazilian wandering spider 30 mm [30] 1.079 mg [44] .00061–.00157 mg/kg [44] disputed effectiveness of the antivenin – 4 deaths out of 7 administered [30]
Phoneutria P. nigriventer Brazilian wandering spider 3–5 cm (1.25–2 in) [45] 2.15 mg [40] 1.079 mg.[44] 15.20 ng/mg.[40] 00061–.00157 mg/kg [44] 200 μg/kg (0.2 ng/mg) [40] severe cardiac failure, signs of priapism and irreversible damage to the central nervous system recorded.
18 deaths in Brazil alone from 2007 to 2010 [30]
Phoneutria P. reidyi Brazilian wandering spider 30 mm .00061–.00157 mg/kg [44] 0.3 mg/kg
Hexophthalma spp. Six-eyed sand spiders 17 mm large necrotic lesions
Haplopelma H. schmidti (previously H. huwenum, Selenocosmia huwena) Chinese bird spider 0.70 mg/kg [46] 1 death reported of a 5-year-old child suffocated, possibly caused by allergens to the venom.
Poecilotheria P. ornata Fringed ornamental tarantula Instances of coma reported.[47][unreliable source?]
Poecilotheria P. fasciata ** Sri Lankan ornamental tarantula Instances of cardiac failure reported [47][dead link][unreliable source?]
Cheiracanthium spp. Yellow Sac spider 6–10 mm one case of irreversible damage to the skin reported [30]
Cheiracanthium C. japonicum Japanese sac spider 6–10 mm
Macrothele M. holsti, M. gigas, M. taiwanensis [38] Primitive burrowing spiders No deaths reported in Taiwan.[48]
Steatoda S. grossa Cupboard spider Mild widow-like symptoms reported, no severe consequences
Study suggests its venom can be effective in treating widow bites because of their similarity.

* This value is based on experience with human exposures.
** Several other kinds of tarantulas in the pet trade are regarded as giving non-trivial bites. Tarantulas are typically far larger than spiders with the most toxic kinds of venom. However, the sheer volume of the venom may compensate for its lesser toxicity. The effects of a full envenomation are probably unknown for many species of tarantulas, so due caution is advisable.

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Polish maritime university Gdynia Maritime UniversityPolish: Uniwersytet Morski w GdyniFormer namesWyższa Szkoła Morska w Gdyni, Akademia Morska w GdyniTypePublicEstablished1920RectorAdam WeintritLocationGdynia, PolandCampusUrbanAffiliationsInternational Association of Maritime UniversitiesWebsiteumg.edu.pl University rankingsRegional – OverallQS Emerging Europe and Central Asia[1]241-250 (2022) The Gdynia Maritime University [2] (Polish: Uniwersytet Morski w Gdyni) is one...

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Australian politician Not to be confused with Malcolm McEachern. SirMalcolm McEacharn46th Mayor of MelbourneIn office1897–1900Preceded byWilliam StrongSucceeded bySir Samuel GillottIn office1903–1904Preceded bySir Samuel GillottSucceeded byCharles PleasanceMember of the Australian Parliamentfor MelbourneIn office29 March 1901 – 10 March 1904Preceded byNew seatSucceeded byWilliam Maloney Personal detailsBorn(1852-02-08)8 February 1852London, United KingdomDied10 March 1910(1910-...

 

Surpanakaशूर्पणखाLukisan Surpanaka (kiri, berkulit hitam) dilukai oleh Laksmana (membawa pedang), dengan Rama dan Sita di belakangnya. Lukisan dari India, produksi Ravi Varma Press (1920).Tokoh RamayanaNamaSurpanakaEjaan Dewanagariशूर्पणखाEjaan IASTśūrpaṇakhāNama lainSarpakenaka, Minaksi, CandranakaKitab referensiRamayanaAsalKerajaan AlengkaGolonganraksasaAyahWisrawaIbuSukesiSaudaraKuwera, Rahwana, Kumbakarna, WibisanaSuamiWidyutjiwaAnakSambri Surpanaka (D...

Oman De Katholieke Kerk in Oman maakt deel uit van de wereldwijde Katholieke Kerk, onder het leiderschap van de paus en de Curie. Oman maqakt deek uit van het apostolisch vicariaat van Zuid-Arabië met zetel in Abu Dhabi. Apostolisch vicaris is sinds 1 mei 2022 bisschop Paolo Martinelli OFM Cap. Apostolisch nuntius voor Oman is sinds 22 mei 2023 aartsbisschop Nicolas Thévenin, die tevens apostolisch nuntius is voor Egypte. Zie ook Christendom in het Midden-Oosten Bronnen, noten en/of referen...

 

Pour les articles homonymes, voir Hayes. HayesGéographiePays  Royaume-UniNation constitutive AngleterreRégion Londres (d)Comté cérémonial Grand LondresBorough londonien Borough londonien de HillingdonCoordonnées 51° 30′ 46″ N, 0° 25′ 16″ OFonctionnementStatut District de Londres (d)modifier - modifier le code - modifier Wikidata Hayes est une ville du borough londonien de Hillingdon. C'est un site urbain situé à 21 km à l'ouest de Cha...

 

Інтерамериканський регіон Всесвітньої організації скаутського руху ісп. Región Scout Interamericana Основна інформація Штаб-квартира Сантьяґо, Чилі Вебсайт http://www.wsb-osi.cl пластовий портал Країни-учасниці Інтерамериканський регіону Інтерамериканський регіон (англ. the Interamerican Scout Region,...

جامعة يوفاسكولا   معلومات التأسيس 1934  الموقع الجغرافي إحداثيات 62°14′10″N 25°43′58″E / 62.23625°N 25.732666666667°E / 62.23625; 25.732666666667  البلد فنلندا[1]  إحصاءات عضوية أورسيد  [لغات أخرى]‏ (أكتوبر 2023)[2][3]رابطة الجامعات الأوروبية[4]  الموقع الموقع ا

 

Basketball team in Cincinnati, OhioCincinnati SlammersDivisionCentral (1982–83)Western (1983–87)Founded1982Dissolved1987Historyoriginally the Ohio MixersArenaLima Senior High School (1982–84)Cincinnati Gardens (1984–87)LocationLima, Ohio (1982–84)Cincinnati, Ohio (1984–87)Team colorsred, yellow, black (1982–84)[1]     navy, white, silver (1984–86)     magenta, orange, white (1986–87)[2]     OwnershipSawyer family (...

 

Baim Anak SholehGenre Drama Religi PembuatRapi FilmsSutradara Sidik Cahyo Kusuma Bobby Pemeran Ibrahim Raffi Ahmad Dian Nitami Ramzi Qubil AJ Nizam Billy Kurniawan Niesrina Penggubah lagu temaAtinaLagu pembukaBersyukur — AtinaLagu penutupBersyukur — AtinaNegara asalIndonesiaBahasa asliBahasa IndonesiaJmlh. musim1Jmlh. episode30 (daftar episode)ProduksiProduser eksekutifSoebagio SamtaniProduserGope T. SamtaniPengaturan kameraMulti-kameraDurasi30 menitRumah produksiRapi FilmsDistributorMedi...

For other uses, see Nadja. This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources.Find sources: Nadja novel – news · newspapers · books · scholar · JSTOR (December 2016) Nadja Nadja, cover of the 1964 Livre de Poche editionAuthorAndré BretonCountryFranceLanguageFrenchGenreSurrealist narrationPublisherGrove PressP...

 

25th premier of Ontario Kathleen WynneWynne in 201725th Premier of OntarioIn officeFebruary 11, 2013 – June 29, 2018MonarchElizabeth IILieutenant GovernorDavid OnleyElizabeth DowdeswellPreceded byDalton McGuintySucceeded byDoug FordMember of the Ontario Provincial Parliamentfor Don Valley WestIn officeOctober 2, 2003 – May 3, 2022[1]Preceded byDavid TurnbullSucceeded byStephanie Bowman Additional offices held Leader of the Ontario Liberal PartyIn officeJanuary 26...

 

High school in Delta, British Columbia, CanadaDelview SecondaryAddress9111 116 StreetDelta, British Columbia, V4C 5W8CanadaCoordinates49°10′09″N 122°54′08″W / 49.1692°N 122.9023°W / 49.1692; -122.9023InformationSchool typePublic, high schoolMottoOnce a Raider, Always a Raider.OpenedSeptember 1969School boardSchool District 37 DeltaSchool number3737021PrincipalKevin VasconcelosVice PrincipalChristine OliverStaffAbt. 65 StaffGrades8–12Enrollmentabt. 700 stu...

Rock music of Bangladesh This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Bangladeshi rock – news · newspapers · books · scholar · JSTOR (September 2022) (Learn how and when to remove this template message) Bangladeshi rock musicStylistic originsRock and rollpop rockblues rockhard rockheavy metalfolk rockalte...

 

UFC mixed martial arts event in 2020 UFC Fight Night: Waterson vs. HillThe poster for UFC Fight Night: Waterson vs. HillInformationPromotionUltimate Fighting ChampionshipDateSeptember 12, 2020 (2020-09-12)VenueUFC ApexCityEnterprise, Nevada, United StatesAttendanceNone (behind closed doors)[1]Event chronology UFC Fight Night: Overeem vs. Sakai UFC Fight Night: Waterson vs. Hill UFC Fight Night: Covington vs. Woodley UFC Fight Night: Waterson vs. Hill (also known as UFC ...

 

Strategi Solo vs Squad di Free Fire: Cara Menang Mudah!