Ensayos clínicos

Inclusion Criteria:

• Females or males between 18 and 45 years of age
  • Two of whom have been diagnosed with VCD based upon prior video laryngoscopy
  • The other two of whom do not have known VCD or symptoms of VCD including:
    • Excessive dyspnea
    • Wheezing
    • Stridor
    • Exercise intolerance
• Must be willing and able to participate in a submaximal ramp protocol exercise test on a stationary bike.

Exclusion Criteria: 

• Allergy to ultrasound gel
• Current neck infection
• Open skin lesion over the anterior neck 
• Inability to access the skin of the anterior neck (e.g, large beard, neck flexor muscle spasm, etc)
• Laryngeal mass or tumor
• Prior laryngeal surgery
• Any condition that precludes the ability to perform a vigorous exercise test on a stationary bicycle (e.g., musculoskeletal pain, neurologic condition, peripheral vascular disease)
• Pregnancy  
• History of a cardiac condition or cardiac surgery, more than one risk factor for coronary artery disease, or symptoms suggestive of a cardiac condition including palpitations, chest pain, or dizziness or loss of consciousness with exercise.