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Status asthmaticus (life-threatening exacerbation of bronchial asthma) is an asthmatic attack of unusual severity for a given patient, resistant to bronchodilator therapy that is usual for a given patient. Status asthmaticus also refers to severe exacerbation of bronchial asthma, requiring medical care in a hospital setting. One of the reasons for the development of status asthmaticus may be blockade of b2-adrenergic receptors due to an overdose of b2-adrenergic agonists.
Reasons : • Inaccessibility of constant medical care • Lack of objective monitoring of the condition, including peak flowmetry • The patient’s inability to self-control • Inadequate previous treatment (usually the absence of basic therapy) • Severe attack of bronchial asthma, aggravated by concomitant diseases that complicate treatment in an outpatient setting (for example, psychiatric).
Clinical manifestations
• Increasing resistance to bronchodilators, combined with manifestations of their side effects due to overdose.
• Progressive difficulty in sputum discharge.
• Manifestations characteristic of a normal attack of bronchial asthma, but expressed to an extreme degree. The duration of exhalation is sharply prolonged, dry whistling and buzzing rales are heard, and with progression, breathing becomes weakened, up to “silent lungs” (absence of breathing sounds on auscultation), which reflects the extreme degree of bronchial obstruction.
• Possible development of hypoxemic hypercapnic coma •• Cerebral disorders •• Arterial hypotension •• Collapse.
TREATMENT
Treatment tactics
• Hospitalization.
• First line therapy. Oxygen therapy (1–4 L/min via nasal catheter), hypercapnia is not an obstacle. Inhalation of b2-adrenergic agonists (in the absence of a history of overdose) is better through a nebulizer (salbutamol, fenoterol) or through a can using large-volume spacers (750 ml) with a unidirectional inhalation valve. To prevent cardiovascular complications from this group of drugs, adequate oxygen therapy is necessary. GC is prescribed as early as possible; intravenous and oral routes of administration are equally effective (40–125 mg methylprednisolone IV every 6 hours, followed by 40–80 mg prednisolone per day orally).
• If the condition has not improved, but there is no need for mechanical ventilation, the following are indicated: •• inhalation of an oxygen-helium mixture (causes a decrease in resistance to gas flows in the respiratory tract, turbulent flows in the small bronchi become laminar) •• administration of magnesium sulfate intravenously •• assisted non-invasive ventilation.
• Transfer of a patient with status asthmaticus to mechanical ventilation is carried out according to vital indications in any setting (outside a medical institution, in the emergency department, in the general ward or intensive care unit). The procedure is performed by an anesthesiologist or resuscitator. The goals of mechanical ventilation for bronchial asthma are to support oxygenation, normalize blood pH, and prevent iatrogenic complications. In some cases, during mechanical ventilation of the lungs, intravenous infusion of sodium bicarbonate solution is necessary.
• Second line therapy. Anticholinergic drugs - ipratropium bromide and its combination with a b2-adrenergic agonist (ipratropium bromide + fenoterol) - through a nebulizer followed by transfer to a can with a spacer. Theophylline preparations are administered intravenously under monitoring of serum levels during the first 6 hours from the start of treatment. If there is no effect from inhaled bronchodilators, 0.5 mg (or 4-8 mcg/kg) of salbutamol or terbutaline is administered intravenously over 1 hour.
• Subcutaneous administration of b2-adrenergic agonists is indicated if the development of status is an integral part of a systemic allergic (anaphylactic) reaction, the patient’s consciousness is impaired or there is a threat of respiratory arrest, and there is no effect of inhalation therapy. Epinephrine is administered at a dose of 0.3 mg at intervals of 20 minutes during the first hour and subsequently after 4–6 hours. • The patient remains in the hospital until nocturnal attacks disappear and the patient’s subjective need for short-acting bronchodilators decreases to 3–4 inhalations per day. day.
ICD-10 • J46 Asthmatic status [status asthmaticus]
Bronchial asthma
Bronchial asthma is a chronic relapsing disease with predominant damage to the respiratory tract, which is based on chronic allergic inflammation of the bronchi, accompanied by their hyperreactivity and periodic attacks of difficulty breathing or suffocation as a result of widespread bronchial obstruction, which is caused by bronchospasm, hypersecretion of mucus, and swelling of the bronchial wall.
There are two forms of bronchial asthma - immunological and non-immunological - and a number of clinical and pathogenetic variants: atopic, infectious-allergic, autoimmune, dishormonal, neuropsychic, adrenergic imbalance, primary altered bronchial reactivity (including “aspirin” asthma and physical effort asthma ), cholinergic.
Etiology and risk factors for the occurrence of bronchial asthma in children: atopy, bronchial hyperreactivity, heredity. Causes (sensitizing): household allergens (house dust, house dust mites), epidermal allergens of animals, birds, and insects, fungal allergens, pollen allergens, food allergens, drugs, viruses and vaccines, chemicals.
Pathogenesis. The general pathogenetic mechanism is a change in the sensitivity and reactivity of the bronchi, determined by the reaction of bronchial patency in response to the influence of physical and pharmacological factors.
It is believed that in 1/3 of patients (mainly those suffering from the atonic variant of the disease) asthma is of hereditary origin. The most studied allergic mechanisms of asthma are based on IgE- or IgG-mediated reactions. Leukotrienes play a central role in the pathogenesis of aspirin-induced asthma. In physical exertion asthma, the process of heat transfer from the surface of the respiratory tract is disrupted.
Clinic. The disease often begins with a paroxysmal cough, accompanied by shortness of breath with the discharge of a small amount of glassy sputum (asthmatic bronchitis). The full picture of bronchial asthma is characterized by the appearance of mild, moderate or severe attacks of suffocation. An attack may begin with a precursor (profuse discharge of watery secretion from the nose, sneezing, paroxysmal cough, etc.).
An attack of bronchial asthma is characterized by a short inhalation and an extended exhalation, accompanied by wheezing audible from a distance. The chest is in the position of maximum inspiration, the patient takes a forced position, sitting on the bed, dangling his legs down, tilting his torso slightly forward. The muscles of the shoulder girdle, back, and abdominal wall take part in breathing. When percussing over the lungs, a box sound is determined; upon auscultation, many dry rales are heard. The attack often ends with the release of viscous sputum.
Severe prolonged attacks can develop into an asthmatic state - one of the most dangerous options for the course of the disease.
Asthmatic status
(AS) is an attack of severe suffocation caused by a complication of the chronic course of bronchial asthma. AS differs from ordinary attacks of bronchial asthma in its more severe and prolonged course, resistance to standard therapy, and distinct signs of acute respiratory failure (ARF). The duration of AS can be from several hours to 4-6 days or more. AS is potentially life-threatening. One of the causes of death is the late start of treatment and untimely hospitalization of patients in intensive care units.
Asthmatic status
is a prolonged attack of bronchial asthma, resistant to therapy and characterized by severe or progressive ARF caused by obstruction of the airways, with the patient developing resistance to adrenergic stimulants.
It is fundamentally important to distinguish between two forms of the asthmatic condition. First form of asthmatic condition
- develops quickly and proceeds like anaphylactic shock.
Despite the lightning speed of development of the first form
of the asthmatic condition, its clinical picture has
two stages
:
• the first stage is shock, which is preceded by a symptom complex of acute diffuse bronchospasm and acute respiratory failure;
• the second stage is coma, caused by very quickly developing acute heart failure and increasing hypoxia.
Second form
asthmatic state (the period of transformation of an exacerbation of bronchial asthma into an asthmatic state is extended over time). The most characteristic thing in the development of this form is gradualism, but at the same time progression. One of the leading pathogenetic signs is progressive functional blockade of beta-adrenergic receptors.
The main reasons for the development of status asthmaticus
are: exacerbation of chronic obstructive diseases, acute pneumonia, sinusitis, polyp removal surgery, exacerbation of cholecystopancreatitis, breaks in corticosteroid therapy.
In status asthmaticus, patients die from acute right ventricular failure, gradually developing thrombosis of small branches of the pulmonary artery, relative adrenal insufficiency in hormone-dependent patients, acute respiratory failure (hypoxemic coma).
As our clinical experience shows, it is advisable to distinguish a period of asthmatic status, which can be called “unstable asthma” (periods of threat of asthmatic status).
Clinical characteristics of “unstable asthma”
: • increased frequency of attacks; • change in the nature of attacks; • increasing resistance to therapy. Most of these patients have a history of abuse of sympathomimetics, hypnotics and sedatives for several days, with which the patient tries to eliminate suffocation.
Recommendations for assessing the condition and management of patients with bronchial asthma are based on data from a clinical and instrumental examination of the patient and the effect of inhalation of sympathomimetics.
1.Clinical assessment
- Speech is an important clinical sign of obstruction (hyper-airiness of the lung tissue - the alveoli can no longer fill with air). It can be: 1) not impaired, 2) the patient cannot speak whole sentences, 3) pronounces individual words. - “Fatigue” of the respiratory muscles. Accessory muscles are involved in the act of breathing; Paradoxical thoracoabdominal movements may be observed: - respiratory rate; - heart rate, the appearance of arrhythmic episodes or bradycardia; - changes in blood pressure; - presence of cyanosis; — auscultation — the presence of zones of “silent” lung; - The risk of pneumothorax is high in children, adolescents and women.
2. Instrumental methods
• Determination of peak expiratory flow • Oxygen saturation.
3. Evaluation of the therapeutic effect of inhalation of short-acting sympathomimetics
.
Depending on the changes and dynamics of these indicators, the following forms can be distinguished and the doctor’s treatment tactics can be determined:
Uncontrollable
(treatment evading) asthma: • speech is not impaired;
• participation of the respiratory muscles is not expressed; • attacks appear at night; • BH less than 25; • Heart rate is less than 100; • PSV-60-80%. • Inhalation of a short-acting agonist gives good results: - absence of wheezing/shortness of breath; - response to agonist lasts at least 4 hours. The doctor's tactics
- the patient can be left at home with recommendations: continue taking the agonist with a frequency of inhalations - every 3-4 hours for 24-48 hours. A patient on an inhaled corticosteroid needs to double the dose of the drug for 7-10 days. After this, contact with the attending physician to develop further tactics for managing the patient.
Exacerbation of asthma
(a further increase in symptoms is noted): • speech in incomplete sentences;
• pronounced participation of the respiratory muscles; • BH is more than 25; • Heart rate is less than PO; • PSV-less than 50%; • incomplete response to inhaled short-acting agonist implies persistent wheezing with shortness of breath. Physician's tactics
- it is recommended to continue treatment with the addition of an oral corticosteroid against the background of discontinued agonist treatment. Urgent contact with the attending physician is necessary, hospitalization is indicated.
Life-threatening condition
: • speech in separate words; • paradoxical thoracoabdominal movement (fatigue of the respiratory muscles) may be observed, i.e. severe ventilation disorders that may require mechanical ventilation; • RR greater than 30, cyanosis, upon auscultation of the “silent” lung zone; • Heart rate is more than 130, arrhythmic episodes, periods of bradycardia, and often there is an increase in blood pressure. Sweating, decreased diuresis. There is a high risk of pneumothorax; • PSV - less than 30%, oxygen saturation - 40-60%; • poor result on inhalation with sympathomimetics (beta-agonists do not reach the small bronchi) - wheezing with shortness of breath.
Stages of status asthmaticus:
a) I - initial stage: - frequent attacks of severe suffocation, during the treatment of which the quality of breathing is not completely restored or failure to relieve an asthma attack with sympathomimetics - resistance to commonly used bronchodilators with the formation of cardiotoxic reactions (arrhythmias) - forced position of patients, “gray” cyanosis skin and visible mucous membranes - lethargy and mental depression of the patient - respiratory disorders with tachypnea up to 32-40/min; breathing in the lower parts of the lungs is audible - sinus tachycardia up to 130-140 beats/min, hypertension due to impaired biotransformation of catecholamines and an imbalance in the functional state of α- and β-adrenergic receptors. b) II - advanced stage: - constant and painful suffocation - pronounced toxic effect of the used bronchodilators (palpitations and chest pain, nausea and vomiting, tremor of the fingers) - unproductive cough - forced position of the patient, moist gray-cyanotic skin or diffuse cyanosis - mental depression of the patient, which alternates with periods of excitation - superficial tachypnea up to 40-50/min, according to auscultation - the appearance of “silent lung” zones (areas of the lung with a complete absence of vesicular breathing, a decrease in the number of dry rales, the appearance of areas where wheezing does not occur) audible) - high tachycardia, in 1/3 of patients arterial hypertension is replaced by hypotension c) III - hypoxemic coma: - loss of consciousness, preceded by delirium or an episode of convulsions - cold, gray-cyanotic skin, constantly increasing diffuse cyanosis - in 1/3 patients, previous tachypnea is replaced by bradypnea, deep breathing, exhalation is sharply prolonged - “silent lungs” on auscultation - pulse 150–170 beats/min, thread-like, deep arterial hypotension in 2/3 of patients - a sharp drop in oxygen tension in the blood and an increase in carbon dioxide tension A patient with any stage of AS is hospitalized on a stretcher in a sitting position in the intensive care unit.
Emergency treatment:
1. Refusal to use any adrenergic stimulants 2. IV access, infusion of 200 mg of hydrocortisone sodium succinate or 90-120 mg of prednisolone IV in a stream followed by continuous administration of hydrocortisone IV drip (if there is no effect, the dose of GCS is increased by 1.5 -3 times or more) 3. Slow microjet intravenous administration of 120–240 mg of aminophylline followed by intravenous drip infusion of the drug at the rate of 1 mg/kg/hour until the patient’s condition improves 4. Infusion therapy: 400–600 ml of isotonic solution - sodium chloride for 3 hours intravenously, then rheopolyglucin (reomacrodex, neorondex) intravenously with heparinization of infusion media (2500 units of heparin for every 400-500 ml of solution) + sodium iodide 10% solution p 10-30 ml/day IV - for rehydration, thinning and better removal of sputum 5. Oxygen therapy through a leaky face mask or nasopharyngeal catheters at a rate of 2-6 l/min 6. With significant anxiety of the patient: 2.5–5 mg IV droperidol (sedative effect, reduction of psychotic phenomena, reduction of toxic effects of sympathomimetics, reduction of blood pressure by 40-60 mm Hg. for hypertension) 7. If possible, therapeutic bronchoscopy with segmental lavage of the bronchial tree is recommended 8. If it is necessary to intubate the patient, use calypsol (ketamine) up to 4 mg/kg IV (in combination with controlled mechanical ventilation allows stopping AS within 30 minutes) NB! Other sedatives, opiates and opioids, antihistamines against the background of AS are contraindicated due to the danger of depression of the respiratory center!!!
Status asthmaticus and its dangers
What is status asthmaticus? What causes suffocation? What to do if you have status asthmaticus?
What is status asthmaticus?
Status asthmaticus is a prolonged attack of bronchial asthma, severe suffocation, which can last from 4 to 6 days. Its features are: - resistance to conventional treatment; - signs of acute respiratory failure. There are several types of status asthmaticus: 1. A slowly developing attack, which is characterized by narrowing of the bronchi, infectious or allergic inflammation, cough suppression, and accumulation of sputum. 2. Anaphylactic – instant bronchospasm that occurs upon contact with an allergen. 3. Anaphylactoid - bronchospasm associated with mechanical, physical and chemical irritation, possible without an allergic reaction. The most common exacerbation of asthma is slow or metabolic status asthmaticus. In status asthmaticus, the patient can breathe, but is unable to exhale. This condition leads to hyperventilation and is called “air trapping,” which results in acute pulmonary emphysema. Expansion of the lungs and deterioration of gas exchange threaten rupture of the alveoli (pneumothorax).
What causes suffocation?
Any asthma attack can develop into status asthmaticus, and this is often facilitated by: - contact with allergens; - hypothermia; - acute inflammatory process; - stress; - decreased immunity. - blockade of ß-adrenergic receptors; - lack of adrenaline, non-adrenaline, dopamine; - irritation of cholinergic receptors (responsible for spasm, stress). Status asthmaticus is often provoked by: 1. Violation of the use of glucocorticosteroids (GCS) or their incorrect prescription. When stopping medications, in case of acute or chronic insufficiency of the adrenal glands that produce them. 2. Infectious or allergic inflammation - in this case, an attack is caused by an increase in temperature, accumulation of sputum, the appearance of a runny nose, urticaria, and Quincke's edema. 3. Taking sedatives, neuroleptics or sleeping pills can cause depression of the respiratory center. 4. In old age, a common cause is a tendency to bronchospasms due to inhalation of cold air, physical activity, and irritation of the respiratory tract (cholinergic system). External signs of status asthmaticus include: - severe shortness of breath; - participation in breathing of the entire chest and abdominal muscles; - pale or blue skin; - sweating, dryness; - increase or decrease in temperature. Asthmatic status affects many systems of the body: 1. The respiratory system reacts by accelerating breathing - more than 30 times a minute. The exhalation becomes longer than the inhalation and various sounds appear. 2. The cardiovascular system is characterized by an increase in blood pressure and an acceleration of the heartbeat, but when inhaling, the systolic readings fall. 3. Thirst and dry tongue are caused by dehydration during difficult breathing. 4. Hypoxia very often leads to agitation and respiratory panic, developing into irritability and confusion. 5. Depletion of the alkaline reserve of the blood (respiratory acidosis) leads to metabolic acidosis.
What to do if you have status asthmaticus?
A number of diseases that will not be related to complications of bronchial asthma can lead to bronchial obstruction: - ARVI, bronchitis, pneumonia; - urticaria and Quincke's edema; - entry of foreign bodies and laryngeal stenosis; — violation of the pulmonary circulation; - parasitic infestations; - endocrine diseases; — pulmonary emphysema; - hysteria; - hereditary lung diseases. With status asthmaticus, there is no pain in the chest, and pressure does not decrease, as with thromboembolism. For its development, the presence of disease of the bronchi and lungs is necessary. Status asthmaticus is an emergency condition, so first of all you need to call an ambulance. The main medical measures include: - inhalation of humidified oxygen through a mask or nasal catheters; - subcutaneous injection of adrenaline; - relief of spasm with aminophylline; - intravenous administration of corticosteroids.
Source:
Medstream.ru
