Clinical presentation and history taking
The foundation of successful treatment for any infectious pathology is a thorough medical history. In cases of suspected bacterial food poisoning, the physician must detail the complaints. The gastroenteritic variant of the clinical course is most commonly encountered in practice.
Its main criteria:
- Sudden, very acute onset with pronounced signs of gastrointestinal tract involvement (gastroenteritis). Patients are troubled by severe nausea, frequent vomiting, and abdominal pain of various localizations.
- Specific stool characteristics. Stool becomes loose, very profuse, watery, and frequent. It is extremely important to emphasize that the stool is passed strictly without pathological impurities (no mucus, blood, or pus).
- Moderately severe intoxication syndrome. It manifests as elevated temperature (most commonly subfebrile fever, less frequently febrile), general weakness, malaise, and dizziness.
When collecting the personal history, it is essential to clarify the presence of background gastrointestinal diseases, which may aggravate the course of the infection.
Epidemiology and dynamics of symptoms
To correctly select management tactics, it is necessary to use data on the dynamics of disease development and epidemiological anamnesis.
The disease develops rapidly; the incubation period is short, lasting only up to several hours from the moment of infection. A clear link is traced between the deterioration of well-being and the consumption of substandard food products. Often, the disease is of a group character: similar symptoms are identified in other individuals who ate the same foods. An important factor is the presence of indications of poor sanitation in the places of residence or food preparation, as well as gross violations of basic personal hygiene rules.
When assessing the pain syndrome, the physician clarifies its localization and relation to defecation. A characteristic sign of foodborne toxicoinfection is a marked relief or even complete disappearance of abdominal pain after defecation. The dynamics must include assessments of changes in stool volume and character, the duration of nausea, and the frequency of vomiting episodes.
Objective assessment and laboratory diagnostics
The goal of the examination is to determine whether the patient has a foodborne toxicoinfection and formulate a detailed clinical diagnosis.
Objective assessment is based on identifying the symptom triad: gastroenteritis, dehydration, and moderately severe intoxication. Upon palpation, the abdomen remains soft and gurgling, with possible diffuse pain in all regions. The physician records the temperature elevation, the presence and degree of cyanosis, and the levels of hemodynamic parameters.
Special attention is paid to signs of dehydration. These include a noticeable decrease in skin turgor, as well as pronounced dryness of the skin and visible mucous membranes.
The severity of the condition is confirmed by the results of laboratory tests, among which the key roles are played by:
- Hematocrit;
- Blood electrolyte composition;
- Blood gas composition;
- Acid-base balance (ABB).
The etiology of the process can be confirmed by isolating an identical strain of the pathogen (e.g., St. aureus) from food products.
Diagnosis algorithm and treatment tactics
Before starting active therapy, it is necessary to perform differential diagnosis with similar diseases and formulate a detailed clinical diagnosis. It should include the clinical variant (gastric or gastroenteritic), severity degree, and etiology (if confirming laboratory data are available).
The algorithm of the physician's actions after formulating the diagnosis boils down to determining management tactics. The main principle is to immediately prescribe substantiated pathogenetic treatment. This therapy is prescribed right away, regardless of whether the exact etiology of the disease has already been established. During treatment, the physician constantly evaluates the adequacy of the administered therapy.
A mandatory condition for safe patient management is continuous monitoring for formidable complications. These include:
- Increasing dehydration and intoxication;
- Dangerous hemodynamic changes and decreased diuresis;
- Onset of seizure syndrome and impaired consciousness;
- Development of hypovolemic shock.
The outcome of successful therapy is the justification for discharging recovering patients (convalescents).
Briefly: answers to topical questions
What groups of drugs are included in the pathogenetic treatment of foodborne toxicoinfections?
The pathogenetic treatment of foodborne toxicoinfections includes detoxification and rehydration therapy, as well as enzyme preparations.
- Glucose-salt solutions — administered orally for moderate intoxication and moderate dehydration (ORS, Regidron).
- Polyionic (crystalloid) solutions — Quartasol, Trisol, Chlosol, etc.; in case of pronounced dehydration, intravenous rehydration with them is performed before administering colloidal solutions.
- Agents for intravenous detoxification in pronounced intoxication — Rheopolyglucin and 5% glucose solution.
- Enzyme preparations — Digestal, Meзим-forte, Panzinorm, Festal, Cholenzym, Oraza, etc.
With which diseases is the differential diagnosis of foodborne toxicoinfections carried out?
Differential diagnosis of foodborne toxicoinfections is carried out with a number of infectious and non-infectious gastrointestinal diseases, including cholera, salmonellosis, escherichiosis, and viral gastroenteritis (diarrhea).
Differential diagnosis by the nature of disease onset:
| Disease | Nature of onset |
|---|---|
| Foodborne toxicoinfection | Abrupt |
| Acute shigellosis (colitic variant) | Acute, with a short initial period |
| Ulcerative colitis | Gradual or subacute, less frequently acute |
| Colon Cancer | Gradual |
Which microorganisms are the most frequent causative agents of foodborne toxicoinfections?
The most frequent causative agents of foodborne toxicoinfections, accounting for about 3/4 of all cases worldwide, are representatives of opportunistic flora capable of producing enterotoxins.
The main pathogens include:
- Staphylococcus (Staphylococcus aureus) — causes poisoning when enterotoxins are present.
- Bacillus (Bacillus cereus) — exhibits pronounced resistance to environmental factors.
- Clostridium (Clostridium perfringens) — can act as a cause of nosocomial infections.
In addition, frequent causative agents of bacterial food poisoning include halophilic vibrios, klebsiellae, proteus, streptococci, citrobacter, and enterobacter.
To memorize the classical triad of foodborne toxicoinfection, use the rule "GET": Gastroenteritis, Electrolyte loss / dehydration, Intoxication.
Class and exam questions
What symptoms make up the classical triad in food poisoning?
The clinical picture is primarily based on three signs: gastrointestinal tract involvement (gastroenteritis), dehydration, and moderately severe intoxication syndrome.
What determines the prescription of treatment for toxicoinfection?
The basis of management tactics is pathogenetic treatment. It is prescribed immediately, regardless of whether the exact etiology of the disease is already known.
How does pain change after using the restroom?
This disease is characterized by a noticeable lessening or complete disappearance of abdominal pain immediately after defecation.
What else to study on this topic
- Algorithm for differential diagnosis with similar infections
- Assessment of blood gas composition and acid-base balance in severe cases
- Criteria for justifying the discharge of recovering patients (convalescents)
- Specifics of the gastritis clinical variant of toxicoinfection
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