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What is Laryngospasm?
Laryngospasm is an involuntary, uncontrolled muscular contraction, or spasm, of the vocal cords. It is a condition that typically lasts from a few seconds up to 20–30 minutes, but during that time it causes an overwhelming sensation of choking, triggering intense panic and fear in the affected person and in those witnessing the episode.
The crisis begins suddenly and resolves just as abruptly. Once the spasm passes, residual symptoms may linger, including:
- Nausea and vomiting
- Profound exhaustion
- Loss of appetite
The most common underlying causes fall into three broad categories:
- Inflammation of the laryngeal mucosa
- Infections, most often viral
- Allergic reactions
In the vast majority of cases, laryngospasm does not represent a life-threatening medical emergency and carries an excellent prognosis. However, especially at the first episode, it can provoke deep panic both in the patient and in bystanders. When children are affected, it is always advisable to inform the pediatrician, even if the episode resolves spontaneously.
What Is the Difference Between Croup and Laryngospasm?
Laryngospasm is a clinical entity that is not always clearly defined, and its presentation closely resembles that of viral croup. The key distinguishing features are:
- Absence of prodromal symptoms: unlike viral croup, laryngospasm is not preceded by warning signs such as cold-like symptoms or nasal discharge.
- Sudden onset, predominantly at night, often waking the child from sleep.
While both conditions involve upper airway obstruction and produce a characteristic barking cough, croup is typically associated with a viral illness and low-grade fever, whereas laryngospasm strikes without warning and resolves quickly.
Causes
Laryngospasm affects primarily children between 1 and 3 years of age, but adults can also experience episodes, particularly at night, when the spasm causes an immediate awakening from sleep.
The principal causes of laryngospasm include:
- Upper respiratory tract infections: generally viral in origin, such as the common cold or influenza. These are the most frequent triggers in pediatric populations, especially during the colder months.
- Allergies: allergic sensitization of the laryngeal mucosa increases reactivity and susceptibility to spasm.
- Asthma: airway hyperreactivity associated with asthma predisposes both children and adults to laryngeal spasms.
- Gastroesophageal reflux disease (GERD): This is particularly relevant in adults. Acid reflux, especially during the night when lying flat, can trigger silent laryngospasm, which occasionally leads to severe episodes of apnea.
- Irritant exposure: contact with substances such as cigarette smoke, dust, chemical fumes, or even aspiration of liquids (for example, in near-drowning situations involving salt water) can precipitate a spasm.
- General anesthesia: laryngospasm is a recognized complication associated with general anesthesia, occurring most often during extubation (the removal of the breathing tube) when the laryngeal reflexes are partially recovered.
- Stress and anxiety: in adults, psychological stress and anxiety disorders are recognized precipitating factors, and episodes may be recurrent in susceptible individuals.
Children with pre-existing allergies or asthma are at significantly higher risk of developing laryngospasm. In this pediatric population, recurrence is common during the winter season, when viral respiratory infections are prevalent.
Symptoms
A laryngospasm episode begins abruptly and resolves just as suddenly. Although it can last several minutes, the individual glottic closure events typically resolve in under one minute. The clinical picture can be alarming for both the patient and bystanders.
Characteristic symptoms include:
- Hoarseness or complete inability to speak
- A sensation of choking or suffocation
- Inspiratory difficulty (dyspnea, the subjective awareness of labored breathing)
- High-pitched respiratory noises (wheezing or squeaking sounds during inhalation)
- A barking cough (often described as resembling the sound of a seal, which is a hallmark sign)
- Stridor: a harsh, high-pitched sound produced by turbulent airflow through the partially obstructed larynx
- Rapid heart rate (tachycardia)
- Profuse sweating
- Visible chest wall retractions in severe cases (especially in young children)
Although the episode is frightening to witness, particularly in a child, it does not generally pose an immediate life-threatening danger. After the spasm resolves, children may experience:
- Vomiting
- Fatigue and lethargy
- Loss of appetite
Important: When infants or very young children are affected, immediate medical consultation is strongly recommended, even if the episode appears to have resolved completely.
Diagnosis
The diagnosis of laryngospasm is primarily clinical, based on direct observation of the characteristic symptoms and a thorough patient history. In most cases, particularly in pediatric settings, no immediate instrumental investigations are required, as the clinical picture is usually typical and the episode often resolves before a full examination can be completed.
Clinical and Differential Evaluation
A physician (pediatrician or ENT specialist) will assess the quality of the respiratory sounds, particularly the presence of inspiratory stridor, and look for signs of concurrent viral infection. A key priority is differentiating laryngospasm (or spasmodic croup) from more serious and potentially life-threatening conditions that require emergency intervention:
- Epiglottitis: a bacterial infection causing inflammation of the epiglottis (the cartilage flap protecting the larynx). Now rare thanks to vaccination against Haemophilus influenzae type b, it is nonetheless a medical emergency. It typically presents with high fever, drooling, a “tripod” posture (leaning forward to breathe), and odynophagia (painful swallowing), but notably without the barking cough of laryngospasm.
- Foreign body aspiration: especially in toddlers, an inhaled object can cause sudden respiratory obstruction that mimics laryngospasm. The absence of prodromal symptoms and the clinical context (e.g., the child was playing with small objects) are key clues.
- Anaphylaxis: a severe allergic reaction can cause laryngeal edema and airway obstruction. Associated symptoms such as urticaria, hypotension, and exposure to a known allergen help distinguish this from simple laryngospasm.
Red flag signs requiring immediate emergency assessment include:
- Difficulty swallowing and significant drooling (sialorrhea)
- “Tripod” positioning to breathe
- High fever with signs of systemic toxicity (appearing very unwell, pale, or gray)
- Barking cough absence combined with progressive worsening
Further Investigations
In cases of recurrent laryngospasm or when episodes occur in adults without an apparent precipitating cause, the following targeted investigations may be warranted:
- Flexible fiberoptic laryngoscopy: A thin, flexible endoscope with a camera is passed through the nose or mouth to directly visualize the vocal cords and larynx, allowing the exclusion of anatomical anomalies, polyps, tumors, or functional vocal cord disorders.
- Allergological evaluation: If an allergic component is suspected as a trigger, skin prick tests or specific IgE blood tests can identify sensitizations.
- Esophageal pH monitoring or upper endoscopy (gastroscopy): In cases of suspected silent GERD, these tests confirm whether nocturnal acid reflux is stimulating involuntary laryngeal closure.
- Pulse oximetry: During an acute episode, a pulse oximeter can monitor blood oxygen saturation. Levels typically return to normal rapidly once the spasm resolves; persistent hypoxia would indicate a more serious condition.
Treatment and Management
The therapeutic approach to laryngospasm has three principal objectives: resolving the acute muscular contraction, reducing laryngeal mucosal inflammation, and managing the anxiety component that inevitably accompanies the sensation of suffocation.
Immediate Response and Supportive Maneuvers
During an acute episode, the single most important intervention is to remain calm and reassure the patient. Panic increases respiratory rate and muscular tension, which worsens the spasm and intensifies stridor. Caregivers should:
- Speak calmly and soothingly to the child or adult
- Keep the patient in an upright or semi-upright position (never force them to lie down, as this worsens the sensation of obstruction)
- Avoid crowding around the patient, which increases distress
Traditional practice, though supported by limited high-quality scientific evidence, suggests that exposure to humidified air (e.g., sitting in a bathroom with a hot shower running) or cool night air may help relax the laryngeal musculature. However, it is essential to avoid strong aromatic or balsamico substances (such as menthol inhalants or eucalyptus vapors), as these may paradoxically irritate the laryngeal mucosa and trigger further spasms.
Pharmacological Therapy
Evidence-based clinical management of laryngospasm includes the following options:
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Corticosteroids: These form the cornerstone of treatment for laryngospasm and croup. Betamethasone or dexamethasone, administered orally or intramuscularly, rapidly reduce laryngeal edema. Nebulized cortisone (budesonide) via aerosol is effective in mild-to-moderate cases, and its use has been shown to significantly reduce the need for hospitalization. A single dose of oral dexamethasone (0.15–0.6 mg/kg) is often sufficient.
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Nebulized epinephrine (adrenaline): In hospital settings or in cases of severe airway obstruction, inhaled adrenaline provides immediate vasoconstriction of the laryngeal mucosa, reducing swelling and improving airflow within minutes. Its effect is short-lived (approximately 2 hours), requiring observation after administration.
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Proton pump inhibitors (PPIs): When GERD is identified as the underlying cause, long-term PPI therapy effectively reduces acid production and prevents the nocturnal reflux episodes responsible for recurrent laryngospasm in adults.
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Anxiolytics / sedation: In adults with severe anxiety-triggered laryngospasm, short-term management strategies addressing the anxiety component may be considered under specialist supervision.
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Intravenous medications in anesthesia: In the perioperative setting, laryngospasm is treated with deepening of anesthesia, 100% oxygen delivery, positive pressure ventilation, or, in refractory cases, intravenous succinylcholine (a neuromuscular blocking agent).
Lifestyle Changes and Prevention
Preventing recurrent laryngospasm requires identifying and addressing environmental and behavioral triggers:
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Optimal indoor humidity: Maintaining appropriate indoor humidity levels (ideally 40–60%), especially during winter when central heating dries the air, reduces laryngeal irritation. A bedroom humidifier can be beneficial.
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Smoke-free environment: Children prone to laryngospasm must not be exposed to passive cigarette smoke, which directly irritates the mucosa and amplifies laryngeal hyperreactivity. This is one of the most modifiable and impactful risk factors.
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GERD management: Avoiding large meals before bedtime, elevating the head of the bed by approximately 15–20 cm, and reducing intake of acidic, fatty, or spicy foods can substantially reduce nocturnal acid reflux-related episodes.
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Nasal hygiene: Regular nasal saline irrigation (isotonic saline washes) helps maintain a clear upper airway, reduces the infectious burden during viral illness, and minimizes the downstream irritation of the larynx.
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Allergy and asthma control: Optimizing the management of underlying allergies and asthma with appropriate medications (antihistamines, inhaled corticosteroids) reduces laryngeal hypersensitivity.
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Stress management: In adults with anxiety-related laryngospasm, techniques such as diaphragmatic breathing exercises, mindfulness, and cognitive-behavioral therapy may reduce episode frequency.
Prognosis in children: In the majority of pediatric cases, laryngospasm is a benign, self-limiting condition that tends to resolve spontaneously as the child grows. As the airway diameter increases and the laryngeal cartilage becomes more rigid, susceptibility to spasm decreases significantly. An open dialogue with your pediatrician is essential to establish a clear, personalized home action plan so that parents feel confident and prepared should an episode recur.
Bibliography and Sources
- Orliaguet G, Gall O, Savoldelli G, Couloigner V. Case scenario: perianesthetic management of laryngospasm in children. Anesthesiology. 2012;116(2):458–471. DOI: 10.1097/ALN.0b013e318242aae9
- Sobol SE, Zapata S. Epiglottitis and croup. Otolaryngologic Clinics of North America. 2008;41(3):551–566. DOI: 10.1016/j.otc.2008.01.014
- Bjornson CL, Johnson DW. Croup. The Lancet. 2008;371(9609):329–339. DOI: 10.1016/S0140-6736(08)60170-1
- Hampson NB, Dunn SL. Laryngospasm: etiology, treatment, and prevention. Continuing Education in Anaesthesia, Critical Care & Pain. 2014;14(2):47–51. Available at: https://academic.oup.com/bjaed/article/14/2/47/271333
- Russell AC, Le Souëf P. Acute upper airway obstruction in children. Paediatric Respiratory Reviews. 2005;6(1):33–41.
- Thach BT. Maturation and transformation of reflexes that protect the laryngeal airway from liquid aspiration from fetal to adult life. American Journal of Medicine. 2001;111(Suppl 8A):69S–77S.
- American Academy of Pediatrics (AAP). Managing respiratory illnesses in children. Available at: https://www.healthychildren.org
