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Pediatric laryngospasm
R4: 曾揚旗
Pediatric laryngospasm
Laryngospasm: review of different prevention and treatment modalities
Pediatric Anesthesia 2008 18: 281–288
Pediatric laryngospasm Pediatric Anesthesia 2008 18: 303–307
Risk factors for laryngospasm in children during general anesthesia
Pediatric Anesthesia 2008 18: 289-296
Introduction
Laryngospasm is mainly seen in children.
A reflex closure of the upper airway as a result of the glottic musculature spasm prevent foreign material entering the tracheobronchial tree.
This leads to hypoxia and hypercapnea.
Introduction
Prolong hypoxia and hypercapnea abolishes the spastic reflex and the problem is self-limited.
Cardiac arrest, arrhythmia, pulmonary edema, bronchospasm or gastric aspiration may occur.
Definition
Laryngospasm can be defined as glottic closure due to reflex constriction of the laryngeal muscles.
Complete laryngospasm – chest movement but silent with no bag movement and no ventilation possible.
Partial laryngospasm – chest movement but stridulous noise with a mismatch between the patients’ respiratory effort and the small amount of bag movement.
Epidemiology
The overall incidence of laryngospasm is 0.87%.
The incidence in children in the first 9 years of age is 1.74%.
A higher incidence of 2.82% in infants between 1 and 3 months
Mechanism
Most laryngeal reflexes are elicited by stimulation of the afferent fibers contained in the internal branch of the superior laryngeal nerve.
These reflexes control the laryngeal muscle contractions which protect the airway during swallowing.
Clinical manifestation
Signs in both partial and complete laryngospasm : airway obstruction (tracheal tug, paradoxical movement of the chest and abdomen).
Late signs: oxyhemoglobin desaturation, bradycardia and central cyanosis.
Differential diagnosis
Complete laryngospasm Partial laryngospasm Supraglottic obstruction Psychogenic laryngospasm
Risk factors
Anesthesia-related factorsPatient-related factorsSurgery-related factors
Anesthesia-related factors
During anesthesia and emergence: (1) including tracheal intubation, (2) laryngospasm tends to occur after extub
ation (3) spontaneous breathing using a face or la
ryngeal mask.
Anesthesia-related factors
Intravenous (i.v.) induction agents induce laryngospasm
Incidence : Barbiturates (thiopentone) > Ketamine > Propofol
Anesthesia-related factors
Volatile anesthetics Incidence : desflurane > Isoflurane > se
vofluraneLaryngospasm occur in children which
are supervised by less experienced anesthesiologists
Patient-related factors
Incidence of laryngospasm following GA is inversely correlated with age.
Upper respiratory tract infection and airway anomaly (10-fold more prone to develop laryngospasm).
‘passive smoking”, gastroesophageal reflux, patients with elongated uvula and those with history of choking during sleep
Surgery-related factors
Tonsillectomy and adenoidectomy have the highest incidence of laryngospasm (21–26%).
Appendicectomy, cervical dilation, hypospadias surgery, skin transplant and esophageal procedures.
Surgery-related factors
Prevention
Anesthesia induction
Identify the risk factor
Premedication with anticholinergics and benzodiazepine
Insert IV line 2 min after sevoflurance induction ( loss of lid reflex)
Tracheal intubation after ensuring adequate level of anesthesia
PreventionPreventionEmergence
Gentle suctioning of the blood and sections
Put the patient on lateral position
Discontinue inhalation anesthetics
Give lidocaine 1mg/kg iv or propofol 0.25-0.5 mg/kg iv
Wait for the patient to open the eyes and spontaneuosly wake up
Extubate the trachea using the “artificial cough” technique
PreventionPreventionEmergence
Gentle suctioning of the blood and sections
Premedication with anticholinergics and benzodiazepine
Discontinue inhalation anesthetics
Give lidocaine 1mg/kg iv or propofol 0.25-0.5 mg/kg iv
Wait for the patient to open the eyes and spontaneuosly wake up
Extubate the trachea using the “artificial cough” technique
TreatmentIdentification and removal of the offending stimulus such as secretion,
mucus or blood
Inserting an oral or nasal airway if possible
Apply jaw thrust maneuver while firmly pressing on the “laryngospasm notch”
Intermitent positive pressure ventilation with face mask
If laryngospasm is not relieved, deepen the lavel of anesthesia by propofol iv 0.25-0.8 mg/kg
If laryngospasm is not relieved, inject suxamethonium iv 0.1-3 mg/kg or im 3-4 mg/kg followed by mask ventilation and /or tracheal intubation
Treatment
Identification and removal of the offending stimulus such as secretion, mucus or blood
Inserting an oral or nasal airway if possible
Apply jaw thrust maneuver while firmly pressing on the “laryngospasm notch”
Intermitent positive pressure ventilation with face mask
If laryngospasm is not relieved, deepen the lavel of anesthesia by propofol iv 0.25-0.8 mg/kg
If laryngospasm is not relieved, inject suxamethonium iv 0.1-3 mg/kg or im 3-4 mg/kg followed by mask ventilation and /or tracheal intubation
Treatment
The question of whether to use propofol or suxamethonium is a matter of timing.
Propofol should be used prior to suxamethonium.
It is successful in treating laryngospasm in 76.9% of cases and free of cardiovascular events.
Treatment
First, is the lack of interaction of a depolarizing drug with a previously administered nondepolarizing muscle relaxant.
Second, avoiding suxamethonium will eliminate the possibility of prolonged paralysis in patients with pseudocholinesterase deficiency.
Finally, propofol can be used when suxamethonium is contraindicated
Treatment
Suxamethonium still has a crucial role when propofol is unsuccessful.
Its administration should not be delayed until the patient becomes severely desaturated (SpO2 < 85%) severe bradycardia and even cardiac arrest.
It is highly recommended to give atropine at 0.02 mg/kg) i.v. prior to administration of suxamethonium to treat laryngospasm
Treatment
Chung and Rowbottom showed that the use of 0.1 mgAkg)1 i.v. of suxamethonium was successful in treating laryngospasm
Maintenance of spontaneous breathing thus avoiding further hypoxia and the avoidance of bradycardia.
Treatment
When laryngospasm occurs during inhalational induction without previous i.v. access several options can be used.
Warner recommends that i.m. suxamethonium can be administered at 4 mg/kg) followed by tracheal intubation
Treatment
Donati et al. Advise against the use of i.m. suxamethonium for intubation without i.v. access.
They suggest establishing an i.v. access for the administration of drugs to treat laryngospasm
Weiss et al. recommend using the I.O. route as an efficient and quick access to give neuromuscular blocking drugs with faster central circulation times.
Conclusions