Which of the following could be a potential cause of stridor?

Stridor is a high-pitched, wheezing sound typically associated with airway obstruction or narrowing, particularly in the larynx or trachea. A severe asthma attack can lead to stridor due to significant bronchoconstriction, inflammation, and swelling in the airways, which creates turbulence in airflow and results in this characteristic sound. During an asthma attack, the patient may experience difficulty breathing, which can further exacerbate airway narrowing and contribute to the occurrence of stridor.

The other options do not directly contribute to the development of stridor. Coronary heart disease primarily affects the cardiovascular system and does not involve the airway. Dehydration can cause various issues in the body, but it is unlikely to directly cause stridor. Hyperventilation can lead to changes in breathing patterns and may cause a sensation of tightness in the chest or throat, but it typically does not lead to the type of airway obstruction that results in stridor.