Diplophonia

A voice disorder characterized by the perception of two distinct pitches

Diplophonia is a voice disorder characterized by the perception of two distinct pitches during phonation. This condition occurs when the vocal folds produce two different frequencies simultaneously, leading to a "double voice" effect. Diplophonia can be caused by various factors affecting the larynx and vocal fold vibration.

Causes

Diplophonia can result from several underlying conditions that affect the normal vibration of the vocal folds. Common causes include:

• Vocal fold paralysis: When one or both vocal folds are paralyzed, they may not vibrate symmetrically, leading to diplophonia.
• Vocal fold nodules or polyps: These benign growths can cause irregularities in vocal fold vibration.
• Laryngitis: Inflammation of the larynx can alter the tension and mass of the vocal folds, resulting in diplophonia.
• Muscle tension dysphonia: Excessive tension in the laryngeal muscles can disrupt normal vocal fold vibration.
• Reinke's edema: Swelling of the vocal folds can lead to asymmetrical vibration.

Symptoms

The primary symptom of diplophonia is the perception of two distinct pitches during speech or singing. This can make the voice sound hoarse, rough, or "double." Other symptoms may include:

• Vocal fatigue
• Hoarseness
• Difficulty controlling pitch
• Strain or discomfort while speaking

Diagnosis

Diagnosis of diplophonia typically involves a thorough evaluation by an otolaryngologist or a speech-language pathologist. The assessment may include:

• Laryngoscopy: A procedure to visualize the vocal folds and assess their function.
• Stroboscopy: A specialized technique that uses a strobe light to observe vocal fold vibration in slow motion.
• Acoustic analysis: Analyzing the sound of the voice to identify irregularities in pitch and frequency.

Treatment

Treatment for diplophonia depends on the underlying cause. Options may include:

• Voice therapy: Conducted by a speech-language pathologist to improve vocal technique and reduce strain.
• Surgical intervention: In cases where structural abnormalities like nodules or polyps are present, surgery may be necessary.
• Medical management: Treating underlying conditions such as laryngitis or reflux that may contribute to diplophonia.

Prognosis

The prognosis for diplophonia varies depending on the cause and the effectiveness of treatment. Many individuals experience significant improvement with appropriate therapy and management.

Related pages

• Voice disorders
• Larynx
• Vocal fold
• Speech-language pathology