Main clinical stages and syndromes
The clinical course of the pathological process is usually divided into several consecutive or overlapping stages, each characterized by its own set of leading syndromes.
Initial stage At the onset of the disease, gastroenteritic syndrome often comes to the fore. In addition, depending on the form, the initial period may be accompanied by the development of catarrhal, hemorrhagic, or meningeal syndromes.
Advanced stage As the process progresses and the structures of the nervous system are involved, life-threatening conditions develop. Nervous system damage manifests with the following symptoms:
- Ophthalmoplegic syndrome.
- Bulbar syndrome (swallowing and speech disorders).
- Myasthenic syndrome.
- Pronounced respiratory function disorders.
Differential diagnosis: acute gastroenteritis
Due to the presence of neurological symptoms and dyspeptic disorders, the condition often requires differential diagnosis with botulism and acute gastroenteritis of other etiologies.
Criteria for acute gastroenteritis:
- Acute onset: rapid development of symptoms accompanied by severe chills and fever.
- Gastrointestinal tract involvement: repeated, profuse vomiting. Patients complain of cramping pain localized around the umbilicus and in the upper abdomen. Profuse diarrhea with foul-smelling greenish stools is characteristic.
- Dehydration syndrome: progressive thirst develops, strictly corresponding to the volume of fluid lost. Muscle cramps and arterial hypotension occur. In extremely severe cases, collapse and infectious-toxic shock are diagnosed.
A key feature of the course is rapid recovery. At the same time, there is a simultaneous, synchronous disappearance of both gastroenteritis symptoms and signs of general toxicosis.
The most important difference from botulism: in these conditions, bulbar and ophthalmoplegic syndromes are completely absent, and peripheral paralysis does not develop.
Laboratory diagnostics includes a complete blood count (neutrophilic leukocytosis with a left shift to band neutrophils is revealed) and bacteriological examination. Stool, vomit, gastric lavage water, and remnants of suspicious food are subject to culture. The goal is to identify pathogens such as Staphylococcus, Proteus, and others.
Differential diagnosis: anticholinergic poisoning
A picture similar to botulism and severe neuroinfections can be caused by poisoning with drugs and plants containing atropine-like substances (belladonna tincture, henbane, datura, scopolamine, astmatin, belloid).
Diagnostic criteria for poisoning:
- Anamnesis: a clear connection with the intake of a specific drug or parts of a poisonous plant is revealed.
- Parasympathetic nervous system blockade: patients complain of headache and severe dry mouth. Objectively, mydriasis (persistent pupil dilation), tachycardia, various heart rhythm disorders, as well as swallowing and speech disorders are revealed.
Key differences from botulism (CNS excitation symptoms): Unlike botulism, anticholinergic poisoning is characterized by prominent symptoms of central nervous system excitation. Patients experience acute psychiatric disorders and hallucinations. Motor restlessness and agitation, reaching the point of frenzy, are characteristic. Clonic-tonic convulsions may be recorded. Objectively, hyperemia (redness) of the facial skin and elevated body temperature are noted against the background of lowered blood pressure. The final diagnosis is confirmed by toxicological examination.
Specific visual impairments in toxicosis
Special attention should be given to conditions accompanied by a two-wave visual impairment against the background of general intoxication.
Clinical picture: Patients note intense headache and muscle pain, dizziness, nausea, vomiting, abdominal pain, and constantly increasing thirst. In the objective status, wide pupils that show extremely weak reaction to light stimuli stand out.
Specific visual impairment (two-wave pattern):
- First wave: characterized by the appearance of "fog" and flashing before the eyes. Diplopia (double vision) develops.
- Second wave: after the initial disturbances, a period of some, often false, improvement in vision occurs. However, soon after this apparent well-being, a further, deeper deterioration of visual functions develops.
Briefly: answers to topical questions
What specific laboratory diagnostic methods are used to confirm the etiology of enteroviral infection?
To confirm the etiology of enteroviral encephalitis, the sources indicate:
- virological examination: isolation of the virus from blood and cerebrospinal fluid with a biological test on mice;
- serological methods: CFT, IHA, and ELISA in paired sera with an interval of 2–3 weeks.
Which virus serotypes belong to the genus Enterovirus and most frequently cause neurological disorders?
In the sources, enteroviral infection is indicated as caused by polio, Coxsackie, and ECHO viruses.
For Coxsackie viruses, it is directly indicated that they belong to the genus Enterovirus of the Picornaviridae family; groups A and B are distinguished, with a total of more than 30 serotypes.
Neurological manifestations according to the sources are associated with:
- Coxsackie B viruses: CNS damage and development of paralysis;
- Coxsackie group B viruses and echoviruses: they account for 80–90% of aseptic meningitis cases in children.
To distinguish plant poisoning from botulism, remember: in botulism, the CNS is "flaccid" (paralysis), while in belladonna poisoning, it is "frenzied" (hallucinations, convulsions, agitation).
Class and exam questions
How to differentiate gastroenteritis from severe botulism?
In gastroenteritis, ophthalmoplegic and bulbar syndromes, as well as peripheral paralysis characteristic of botulism, are completely absent.
What blood changes are observed in acute food toxicoinfections?
A complete blood count often records neutrophilic leukocytosis with a pronounced band shift.
How does parasympathetic nervous system damage manifest in datura or henbane poisoning?
It manifests as headache, dry mouth, persistent mydriasis, tachycardia, rhythm disorders, as well as speech and swallowing disorders.
What else to study on this topic
- Pathogenesis of the development of bulbar and ophthalmoplegic syndromes in nervous system lesions.
- Mechanisms of infectious-toxic shock formation against the background of profuse diarrhea.
- Toxicological screening: methods for detecting belladonna alkaloids and scopolamine.
- Features of the course of two-wave visual impairment in specific intoxications.
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