Final answer:
The appropriate treatment for a laryngospasm not relieved by continuous positive pressure ventilation is the administration of a muscle relaxant. Succinylcholine (Anectine) 20mg is the correct option, as it induces a temporary paralysis, facilitating ventilation.
Step-by-step explanation:
The most appropriate treatment for a patient experiencing a laryngospasm, which is a sudden spasm of the vocal cords, is to administer a muscle relaxant to allow for ventilation. Among the options provided, Succinylcholine (Anectine) is a rapid-onset, short-duration muscle relaxant that is often used in emergency situations where immediate airway access is needed.
Succinylcholine acts on the cholinergic receptors at the neuromuscular junction, causing all muscles innervated by the motor nerves to contract. This is followed by paralysis of the muscles, including those in the larynx, temporarily relieving the spasm and allowing the patient to be ventilated. The final answer in this case, based on the options given and the need for immediate intervention, would be 4) Succinylcholine (Anectine) 20mg.
Upon administration, Succinylcholine's effect typically lasts for a brief period of time, ranging from a few minutes up to 10 or so, which provides a window during which the patient's breathing can be managed and other more definitive treatments can be administered as needed. It should be noted that dosages can vary based on individual factors, and physicians will determine the appropriate dose based on the patient's weight and overall condition. A dose of 20mg is indicated here, however, normally a dose of 1-1.5 mg/kg is administered in adults for rapid sequence intubation, which for a 75 kg male would be approximately 75-112.5 mg.