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Abstract

Scombroid poisoning is described in the literature as a toxic poisoning caused by ingestion of certain dark meat fish undergoing bacterial decomposition. Poisoning results from the ingestion of a heat-stable toxin. We describe the case of a man who presented to the emergency department several hours after eating tuna steak with evidence of scombroid poisoning that was associated with loss of vision and atrial tachycardia with block. All signs and symptoms resolved after treatment for scombroid poisoning. [McInerney J, Sahgal P, Vogel M, Rahn E, Jonas E: Scombroid poisoning. Ann Emerg Med August 1996;28:235-238.]
Practice CMAJ
674 CMAJ, April 3, 2012, 184(6) © 2012 Canadian Medical Association or its licensors
References
1. Jantschitsch C, Kinaciyan T, Mana M, et al. Severe
scombroid sh poisoning: an underrecognized der-
matologic emergency. J Am Acad Dermatol 2011;
65:246-7.
2. Hungerford JM. Scombroid poisoning: a review.
Toxicon 2010;56:231-43.
3. O’Connor MM, Forbes GM. Scombroid poisoning:
not sh allergy. Aust N Z J Med 2000;30:520.
4. Morrow JD, Margolies GR, Rowland J, et al. Evi-
dence that histamine is the causative toxin of scom-
broid-sh poisoning. N Engl J Med 1991;324:716-20.
5. Attaran RR, Probst F. Histamine sh poisoning: a
common but frequently misdiagnosed condition.
Emerg Med J 2002;19:474-5.
2
45
Five things to know about …
Scombroid poisoning
Piero Stratta MD, Guido Badino PhD
1
Scombroid poisoning is a common
form of food poisoning related to
sh ingestion
Scombroid poisoning occurs after the
ingestion of fresh, canned or smoked sh
with high histamine levels due to im -
proper processing or storage. First de -
scribed in conjunction with sh in the
suborder Scombroidea (e.g., tuna and
mackerel), it has since been described
with other dark-eshed sh (e.g., sar-
dines and ancho vies). Scombroid poison-
ing is one of the most common causes of
morbidity associated with sh intake.1,2
Scombroid poisoning is not an allergy
Allergic reactions typically affect one person who has a history of allergy to the
implicated food item. However, with scombroid poisoning, more than one per-
son, often with no history of allergies, may be affected.3Histamine produced by
the decarboxylation of histidine in the muscle of the sh is primarily responsible
for the condition. The decarboxylation process is induced by enzymes produced
by primarily enteric gram-negative bacteria (e.g., Morganella morganii,
Escherichia coli, Klebsiella species and Pseudomonas aeruginosa) found in the
sh’s cutis and intestines.1,2
Competing interests: None declared.
This article has been peer reviewed.
Afliations: From the Department of Nephrol-
ogy and Transplantation (Stratta), Amedeo Avo-
gadro University, Novara, Italy; and the Depart-
ment of Animal and Human Biology (Badino),
University of Torino, Torino, Italy
Correspondence to: Dr. Piero Stratta, piero.stratta
@med.unipmn.it
CMAJ 2012. DOI:10.1503/cmaj.111031
3
Symptoms are that of histamine
poisoning
Symptoms of scombroid poisoning
include ushing, rash, urticaria (gen-
erally widespread erythema, usually
lacking wheals), palpitations, head -
ache, dizziness, sweating, and burn-
ing of the mouth and throat. Gas-
trointestinal symptoms can in clude
abdominal cramps, nausea, vomiting
and diarrhea. Broncho spasm, respira-
tory distress and vasodilatory shock
have also been described. Symptoms
begin within 10 to 90 minutes after
eating the implicated sh. The rash
lasts 2–5 hours, and the other symp-
toms usually disappear within 3–36
hours. The diagnosis is often clinical
and can be conrmed by measure-
ment of histamine in incriminated
spoiled food. Determination of the
patient’s histamine level in plasma or
the level of histamine metabolites
(e.g., N-methylhistamine) in urine can
also support the diagnosis.4
Histamine does not change the smell
or appearance of the affected sh
Scombroid poisoning is frequently
misdiagnosed.5Because histamine
does not alter the organoleptic quality,
the sh may seem normal. However,
elevated histamine levels can occur in
sh owing to improper refrigeration
before processing or to storage of the
sh at room temperature after cook-
ing. Therefore, the appearance, taste
and smell of the sh are poor guides
as to the presence of histamine. Hista-
mine is heat-stable and remains pres -
ent after cooking, freezing, canning or
smoking. Outbreaks are most common
in summer.1,2
Treatment involves antihistamines
and supportive care
Most instances of scombroid poison-
ing are self-limited. However, if the
patient has symptoms severe enough
to re quire treatment, rapid-acting
antihistamines (usually H1-receptor
antagonists) are commonly used,
along with supportive care tailored to
the symptoms. Adrenalin and corti -
co steroids are generally not indi-
cated.1,2,5 To prevent further instances
of poisoning, public health authori-
ties should be notied to investigate
the source and remove the impli-
cated product from distribution.
... Although SFP is mainly related to seafood poisoning, it was also reported after consumption of contaminated cheese [40]. Symptoms can last from a few hours up to a maximum of 36 h and a correct clinical diagnosis requires measuring the histamine level in the blood plasma, and the level of histamine metabolites in the urine of the patient [41]. Treatment, if necessary, involves fast-acting antihistamines and supportive care. ...
... It is worthwhile to mention that fish with high concentrations of histamine may still retain a normal, unsuspicious appearance and odor [44], but it is unsafe for consumption. Furthermore, histamine is heat-stable and will not be inactivated by elevated temperatures such as during cooking and smoking [41]. ...
... While intake of histamine-contaminated seafood is the main reason for SPF [41], it is also known that oral intake of pure histamine by healthy volunteers causes only mild SFP symptoms [45]. The major enzymes responsible for the metabolic degradation of histamine are diamine oxidase DAO and histamine-N-methyltransferase HNMT [46]. ...
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