Hoarse voice

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Hoarse voice
Other namesHoarseness, dysphonia
Specialty Otolaryngology

A hoarse voice, also known as dysphonia or hoarseness, [1] is when the voice involuntarily sounds breathy, raspy, or strained, or is softer in volume or lower in pitch. [2] [3] [ clarification needed ] A hoarse voice can be associated with a feeling of unease or scratchiness in the throat. [2] Hoarseness is often a symptom of problems in the vocal folds of the larynx. [2] It may be caused by laryngitis, which in turn may be caused by an upper respiratory infection, a cold, or allergies. [2] Cheering at sporting events, speaking loudly in noisy situations, talking for too long without resting one's voice, singing loudly, or speaking with a voice that is too high or too low can also cause temporary hoarseness. [2] A number of other causes for losing one's voice exist, and treatment is generally by resting the voice and treating the underlying cause. [2] If the cause is misuse or overuse of the voice, drinking plenty of water may alleviate the problems. [2]

Contents

It appears to occur more commonly in females and the elderly. [4] Furthermore, certain occupational groups, such as teachers and singers, are at an increased risk. [5] [6]

Long-term hoarseness, or hoarseness that persists over three weeks, especially when not associated with a cold or flu should be assessed by a medical doctor. [2] It is also recommended to see a doctor if hoarseness is associated with coughing up blood, difficulties swallowing, a lump in the neck, pain when speaking or swallowing, difficulty breathing, or complete loss of voice for more than a few days. [2] For voice to be classified as "dysphonic", abnormalities must be present in one or more vocal parameters: pitch, loudness, quality, or variability. [7] Perceptually, dysphonia can be characterised by hoarse, breathy, harsh, or rough vocal qualities, but some kind of phonation remains. [7]

Dysphonia can be categorized into two broad main types: organic and functional, and classification is based on the underlying pathology. While the causes of dysphonia can be divided into five basic categories, all of them result in an interruption of the ability of the vocal folds to vibrate normally during exhalation, which affects the voice. The assessment and diagnosis of dysphonia is done by a multidisciplinary team, and involves the use of a variety of subjective and objective measures, which look at both the quality of the voice as well as the physical state of the larynx.[ citation needed ] Multiple treatments have been developed to address organic and functional causes of dysphonia. Dysphonia can be targeted through direct therapy, indirect therapy, medical treatments, and surgery. Functional dysphonias may be treated through direct and indirect voice therapies, whereas surgeries are recommended for chronic, organic dysphonias. [8]

Types

Voice disorders can be divided into 2 broad categories: organic and functional. [9] The distinction between these broad classes stems from their cause, whereby organic dysphonia results from some sort of physiological change in one of the subsystems of speech (for voice, usually respiration, laryngeal anatomy, and/or other parts of the vocal tract are affected). Conversely, functional dysphonia refers to hoarseness resulting from vocal use (i.e. overuse/abuse). [10] Furthermore, according to ASHA, organic dysphonia can be subdivided into structural and neurogenic; neurogenic dysphonia is defined as impaired functioning of the vocal structure due to a neurological problem (in the central nervous system or peripheral nervous system); in contrast, structural dysphonia is defined as impaired functioning of the vocal mechanism that is caused by some sort of physical change (e.g. a lesion on the vocal folds). [10] Notably, an additional subcategory of functional dysphonia recognized by professionals is psychogenic dysphonia, which can be defined as a type of voice disorder that has no known cause and can be presumed to be a product of some sort of psychological stressors in one's environment. [10] [11] It is important to note that these types are not mutually exclusive and much overlap occurs. For example, Muscle Tension Dysphonia (MTD) has been found to be a result of many different causes including the following: MTD in the presence of an organic pathology (i.e. organic type), MTD stemming from vocal use (i.e. functional type), and MTD as a result of personality and/or psychological factors (i.e. psychogenic type). [10] [12]

Causes

The most common causes of hoarseness is laryngitis (acute 42.1%; chronic 9.7%) and functional dysphonia (30%). [13] Hoarseness can also be caused by laryngeal tumours (benign 10.7 - 31%; malignant 2.2 - 3.0%). [13] Causes that are overall less common include neurogenic conditions (2.8 - 8.0%), psychogenic conditions (2.0 - 2.2%), and aging (2%). [13]

A variety of different causes, which result in abnormal vibrations of the vocal folds, can cause dysphonia. These causes can range from vocal abuse and misuse to systemic diseases. Causes of dysphonia can be divided into five basic categories, although overlap may occur between categories. [14] [15] [16] [17] (Note that this list is not exhaustive):

  1. Neoplastic/structural: Abnormal growths of the vocal fold tissue.
  2. Inflammatory: Changes in the vocal fold tissue as a result of inflammation.
  3. Neuromuscular: Disturbances in any of the components of the nervous system that control laryngeal function.
  4. Associated Systemic Diseases: Systemic diseases which have manifestations that affect the voice.
  5. Technical: Associated with poor muscle functioning or psychological stresses, with no corresponding physiological abnormalities of the larynx.
    • Psychogenic such as dissociation disorder [18]
    • Excess demands
    • Stress
    • Vocal strain

Employment

It has been suggested that certain occupational groups may be at increased risk of developing dysphonia [5] [6] due to the excessive or intense vocal demands of their work. [19] Research on this topic has primarily focused on teachers and singers, although some studies have examined other groups of heavy voice users (e.g. actors, cheerleaders, aerobic instructors, etc.). [5] [20] At present, it is known that teachers and singers are likely to report dysphonia. [19] [21] Moreover, physical education teachers, teachers in noisy environments, and those who habitually use a loud speaking voice are at increased risk. [19] The term clergyman's throat or dysphonia clericorum was previously used for painful dysphonia associated with public speaking, particularly among preachers. [22] However, the exact prevalence rates for occupational voice users are unclear, as individual studies have varied widely in the methodologies used to obtain data (e.g. employing different operational definitions for "singer"). [19] [21]

Mechanism

Located in the anterior portion of the neck is the larynx (also known as the voice box), a structure made up of several supporting cartilages and ligaments, which houses the vocal folds. [23] In normal voice production, exhaled air moves out of the lungs and passes upward through the vocal tract. [23] At the level of the larynx, the exhaled air causes the vocal folds to move toward the midline of the tract (a process called adduction). The adducted vocal folds do not close completely but instead remain partially open. The narrow opening between the folds is referred to as the glottis. [23] [7] As air moves through the glottis, it causes a distortion of the air particles which sets the vocal folds into vibratory motion. It is this vibratory motion that produces phonation or voice. [7] In dysphonia, there is an impairment in the ability to produce an appropriate level of phonation. More specifically, it results from an impairment in vocal fold vibration or the nerve supply of the larynx. [7]

Diagnosis

The assessment and diagnosis of a dysphonic voice is completed by a multidisciplinary team, such as an otolaryngologist (ear, nose and throat doctor) and Speech-Language Pathologist, involving the use of both objective and subjective measures to evaluate the quality of the voice as well as the condition of the vocal fold tissue and vibration patterns. [24]

Definition

Dysphonia is a broad clinical term which refers to abnormal functioning of the voice. [23] [7] More specifically, a voice can be classified as "dysphonic" when there are abnormalities or impairments in one or more of the following parameters of voice: pitch, loudness, quality, and variability. [7] For example, abnormal pitch can be characterized by a voice that is too high or low whereas abnormal loudness can be characterized by a voice that is too quiet or loud. [7] Similarly, a voice that has frequent, inappropriate breaks characterizes abnormal quality while a voice that is monotone (i.e., very flat) or inappropriately fluctuates characterizes abnormal variability. [7] While hoarseness is used interchangeably with the term dysphonia, it is important to note that the two are not synonymous. Hoarseness is merely a subjective term to explain the perceptual quality (or sound) of a dysphonic voice. [25] While hoarseness is a common symptom (or complaint) of dysphonia, [23] there are several other signs and symptoms that can be present such as: breathiness, roughness, and dryness. Furthermore, a voice can be classified as dysphonic when it poses problems in the functional or occupational needs of the individual or is inappropriate for their age or sex. [7]

Auditory-perceptual measures

Auditory-perceptual measures are the most commonly used tool by clinicians to evaluate the voice quality due to its quick and non-invasive nature. [26] Additionally, these measures have been proven to be reliable in a clinical setting. [27] Ratings are used to evaluate the quality of a patient's voice for a variety of voice features, including overall severity, roughness, breathiness, strain, loudness and pitch. These evaluations are done during spontaneous speech, sentence or passage reading or sustained vowel productions. [17] The GRBAS (Grade, Roughness, Breathiness, Asthenia, Strain) and the CAPE-V (Consensus Auditory Perceptual Evaluation—Voice) are two formal voice rating scales commonly used for this purpose. [26]

Vocal fold imaging

Vocal fold imaging techniques are used by clinicians to examine the vocal folds and allows them to detect vocal pathology and assess the quality of the vocal fold vibrations. Laryngeal stroboscopy is the primary clinical tool used for this purpose. Laryngeal stroboscopy uses a synchronized flashing light passed through either a rigid or flexible laryngoscope to provide an image of the vocal fold motion; the image is created by averaging over several vibratory cycles and is thus not provided in real-time. [28] As this technique relies on periodic vocal fold vibration, it cannot be used in patients with moderate to severe dysphonia. [17] High speed digital imaging of the vocal folds (videokymography), another imaging technique, is not subject to the same limitations as laryngeal stroboscopy. A rigid endoscope is used to take images at a rate of 8000 frames per second, and the image is displayed in real time. As well, this technique allows imaging of aperiodic vibrations [17] and can thus be used with patients presenting with all severities of dysphonia.

Acoustic measures

Acoustic measures can be used to provide objective measures of vocal function. Signal processing algorithms are applied to voice recordings made during sustained phonation or during spontaneous speech. [29] The acoustic parameters which can then be examined include fundamental frequency, signal amplitude, jitter, shimmer, and noise-to-harmonic ratios. [17] However, due to limitations imposed by the algorithms employed, these measures cannot be used with patients who exhibit severe dysphonia. [29]

Aerodynamic measures

Aerodynamic measures of voice include measures of air volume, air flow and sub glottal air pressure. The normal aerodynamic parameters of voice vary considerably among individuals, which leads to a large overlapping range of values between dysphonic and non-dysphonic patients. This limits the use of these measures as a diagnostic tool. [17] Nonetheless, they are useful when used in adjunct with other voice assessment measures, or as a tool for monitoring therapeutic effects over time. [27]

Prevention

Given that certain occupations are more at risk for developing dysphonia (e.g., teachers) research into prevention studies have been conducted. [30] Research into the effectiveness of prevention strategies for dysphonia have yet to produce definitive results, however, research is still ongoing. [9] [30] Primarily, there are two types of vocal training recognized by professionals to help with prevention: direct and indirect. Direct prevention describes efforts to reduce conditions that may serve to increase vocal strain (such as patient education, relaxation strategies, etc.), while indirect prevention strategies refer to changes in the underlying physiological mechanism for voice production (e.g., adjustments to the manner in which vocal fold adduction occurs, respiratory training, shifting postural habits, etc.). [9] [30]

Treatment

Although there is no universal classification of voice problems, voice disorders can be separated into certain categories: organic (structural or neurogenic), functional, neurological (psychogenic) or iatrogenic, for example. [31] Depending on the diagnosis and severity of the voice problem, and depending on the category that the voice disorder falls into, there are various treatment methods that can be suggested to the patient. The professional has to keep in mind there is not one universal treatment, but rather the clinical approach must find what the optimal effective course of action for that particular patient is.[ citation needed ]

There are three main type of treatments: medical treatments, voice therapy and surgical treatments. [32] When necessary, certain voice disorders use a combination of treatment approaches. [9] A medical treatment involves the use of botulinum toxin (botox) or anti-reflux medicines, for example. Botox is a key treatment for voice disorders such as Spasmodic Dysphonia. [33] Voice therapy is mainly used with patients who have an underlying cause of voice misuse or abuse. [34] Laryngologists also recommend this type of treatment to patients who have an organic voice disorder - such as vocal fold nodules, cysts or polyps as well as to treat functional dysphonia. [9] Certain surgical treatments can be implemented as well - phono microsurgery (removal of vocal fold lesions performed with a microscope), laryngeal framework surgery (the manipulation of the voice box), as well as injection augmentation (injection of substance to vocal folds to improve closure). Surgical treatments may be recommended for patients having an organic dysphonia. [35] [36]

A combination of both an indirect treatment method (an approach used to change external factors affecting the vocal folds) [37] and a direct treatment method (an approach used where the mechanisms functioning during the use of the vocal folds, such as phonation or respiration, are the main focus) [37] may be used to treat dysphonia. [9] [12] [38] [39]

Direct therapies

Direct therapies address the physical aspects of vocal production. [9] Techniques work to either modify vocal fold contact, manage breathing patterns, and/or change the tension at level of the larynx. [9] Notable techniques include, but are not limited to, the yawn-sigh method, optimal pitch, laryngeal manipulation, humming, the accent method, and the Lee Silverman Voice Treatment. [9] [38] An example of a direct therapy is circumlaryngeal manual therapy, which has been used to reduce tension and massage hyoid-laryngeal muscles. [12] This area is often tense from chronic elevation of the larynx. [12] Pressure is applied to these areas as the patient hums or sustains a vowel. [12] Traditional voice therapy is often used to treat muscular tension dysphonia. [12]

Indirect therapies

Indirect therapies take into account external factors that may influence vocal production. [9] This incorporates maintenance of vocal hygiene practices, as well as the prevention of harmful vocal behaviours. [40] Vocal hygiene includes adequate hydration of the vocal folds, monitoring the amount of voice use and rest, avoidance of vocal abuse (e.g., shouting, clearing of the throat), and taking into consideration lifestyle choices that may affect vocal health (e.g., smoking, sleeping habits). [40] Vocal warm-ups and cool-downs may be employed to improve muscle tension and decrease risk of injury before strenuous vocal activities. [40] It should be taken into account that vocal hygiene practices alone are minimally effective in treating dysphonia, and thus should be paired with other therapies. [40]

Medication and surgery

Medical and surgical treatments have been recommended to treat organic dysphonias. An effective treatment for spasmodic dysphonia (hoarseness resulting from periodic breaks in phonation due to hyperadduction of the vocal folds) is botulinum toxin injection. [8] [41] The toxin acts by blocking acetylcholine release at the thyro-arytenoid muscle. Although the use of botulinum toxin injections is considered relatively safe, patients' responses to treatment differ in the initial stages; some have reported experiencing swallowing problems and breathy voice quality as a side-effect to the injections. [8] [41] Breathiness may last for a longer period of time for males than females. [41]

Surgeries involve myoectomies of the laryngeal muscles to reduce voice breaks, and laryngoplasties, in which laryngeal cartilage is altered to reduce tension. [8]

Epidemiology

Dysphonia is a general term for voice impairment that is sometimes used synonymously with the perceptual voice quality of hoarseness. [13] It is the reason for 1% of all visits to primary care providers. [13] The lifetime risk of hoarse voice complaints among primary care patients is 30%. [13] Since hoarseness is a general symptom, it is associated with a number of laryngeal diagnoses. [13]

There is an interplay of sex and age differences associated with dysphonia. The point prevalence of dysphonia in adults under the age of 65 is 6.6%. [20] Dysphonia is more common in adult females than males, [20] [42] possibly due to sex-related anatomical differences of the vocal mechanism. [4] In childhood, however, dysphonia is more often found in boys than girls. [43] As there are no anatomical differences in larynges of boys and girls prior to puberty, it has been proposed that the higher rate of voice impairment found in boys arises from louder social activities, personality factors, or more frequent inappropriate vocal use. [43] The most common laryngeal diagnosis among children is vocal fold nodules, [20] a condition known to be associated with vocally damaging behaviours. [44] However, a causal relationship has not yet been definitively proven. [43] The overall prevalence of dysphonia in children ranges from 3.9% - 23.4%, most commonly affecting children between the ages of 8 - 14. [20] Among the elderly, dysphonia is associated with both naturally occurring anatomical and physiological changes as well as higher rates of pathological conditions. [42] The point prevalence of dysphonia among the elderly is 29%.[ failed verification ] [20] Findings regarding the prevalence of geriatric dysphonia in the general population are very variable, ranging from 4 - 29.1%. [42] This variability is likely due to different methodology used in obtaining information from participants. [20] The most common laryngeal diagnoses among the elderly are polyps, laryngopharyngeal reflux, muscle tension dysphonia, vocal fold paresis or paralysis, vocal fold mass, glottic insufficiency, malignant lesions, and neurologic conditions affecting the larynx. [42]

Related Research Articles

Vocal cord nodules are bilaterally symmetrical benign white masses that form at the midpoint of the vocal folds. Although diagnosis involves a physical examination of the head and neck, as well as perceptual voice measures, visualization of the vocal nodules via laryngeal endoscopy remains the primary diagnostic method. Vocal fold nodules interfere with the vibratory characteristics of the vocal folds by increasing the mass of the vocal folds and changing the configuration of the vocal fold closure pattern. Due to these changes, the quality of the voice may be affected. As such, the major perceptual signs of vocal fold nodules include vocal hoarseness and breathiness. Other common symptoms include vocal fatigue, soreness or pain lateral to the larynx, and reduced frequency and intensity range. Airflow levels during speech may also be increased. Vocal fold nodules are thought to be the result of vocal fold tissue trauma caused by excessive mechanical stress, including repeated or chronic vocal overuse, abuse, or misuse. Predisposing factors include profession, gender, dehydration, respiratory infection, and other inflammatory factors.

Vocal fold cysts are benign masses of the membranous vocal folds. These cysts are enclosed, sac-like structures that are typically of a yellow or white colour. They occur unilaterally on the midpoint of the medial edge of the vocal folds. They can also form on the upper/superior, surface of the vocal folds. There are two types of vocal fold cysts:

  1. Sub-epithelial vocal fold cysts- located in the superficial lamina propria of the vocal folds.
  2. Ligament vocal fold cysts- located within the deeper layers of the lamina propria or on the vocal ligament.
<span class="mw-page-title-main">Reinke's edema</span> Medical condition

Reinke's edema is the swelling of the vocal cords due to fluid (edema) collected within the Reinke's space. First identified by the German anatomist Friedrich B. Reinke in 1895, the Reinke's space is a gelatinous layer of the vocal cord located underneath the outer cells of the vocal cord. When a person speaks, the Reinke's space vibrates to allow for sound to be produced (phonation). The Reinke's space is sometimes referred to as the superficial lamina propria.

<span class="mw-page-title-main">Laryngitis</span> Medical condition

Laryngitis is inflammation of the larynx. Symptoms often include a hoarse voice and may include fever, cough, pain in the front of the neck, and trouble swallowing. Typically, these last under two weeks.

<span class="mw-page-title-main">Laryngectomy</span> Surgical procedure

Laryngectomy is the removal of the larynx and separation of the airway from the mouth, nose and esophagus. In a total laryngectomy, the entire larynx is removed. In a partial laryngectomy, only a portion of the larynx is removed. Following the procedure, the person breathes through an opening in the neck known as a stoma. This procedure is usually performed by an ENT surgeon in cases of laryngeal cancer. Many cases of laryngeal cancer are treated with more conservative methods. A laryngectomy is performed when these treatments fail to conserve the larynx or when the cancer has progressed such that normal functioning would be prevented. Laryngectomies are also performed on individuals with other types of head and neck cancer. Less invasive partial laryngectomies, including tracheal shaves and feminization laryngoplasty may also be performed on transgender women and other female or non-binary identified individuals to feminize the larynx and/or voice. Post-laryngectomy rehabilitation includes voice restoration, oral feeding and more recently, smell and taste rehabilitation. An individual's quality of life can be affected post-surgery.

<span class="mw-page-title-main">Laryngeal papillomatosis</span> Medical condition

Laryngeal papillomatosis, also known as recurrent respiratory papillomatosis (RRP) or glottal papillomatosis, is a rare medical condition in which benign tumors (papilloma) form along the aerodigestive tract. There are two variants based on the age of onset: juvenile and adult laryngeal papillomatosis. The tumors are caused by human papillomavirus (HPV) infection of the throat. The tumors may lead to narrowing of the airway, which may cause vocal changes or airway obstruction. Laryngeal papillomatosis is initially diagnosed through indirect laryngoscopy upon observation of growths on the larynx and can be confirmed through a biopsy. Treatment for laryngeal papillomatosis aims to remove the papillomas and limit their recurrence. Due to the recurrent nature of the virus, repeated treatments usually are needed. Laryngeal papillomatosis is primarily treated surgically, though supplemental nonsurgical and/or medical treatments may be considered in some cases. The evolution of laryngeal papillomatosis is highly variable. Though total recovery may be observed, it is often persistent despite treatment. The number of new cases of laryngeal papillomatosis cases is approximately 4.3 cases per 100,000 children and 1.8 cases per 100,000 adults annually.

<span class="mw-page-title-main">Bogart–Bacall syndrome</span> Voice disorder caused by abuse or overuse of the vocal cords

Bogart–Bacall syndrome (BBS) is a voice disorder that is caused by abuse or overuse of the vocal cords.

<span class="mw-page-title-main">Laryngology</span> Medical specialty

Laryngology is a branch of medicine that deals with disorders, diseases and injuries of the larynx, colloquially known as the voice box. Laryngologists treat disorders of the larynx, including diseases that affects the voice, swallowing, or upper airway. Common conditions addressed by laryngologists include vocal fold nodules and cysts, laryngeal cancer, spasmodic dysphonia, laryngopharyngeal reflux, papillomas, and voice misuse/abuse/overuse syndromes. Dysphonia/hoarseness; laryngitis ; *Spasmodic dysphonia; dysphagia; Tracheostomy; Cancer of the larynx; and vocology are included in laryngology.

<span class="mw-page-title-main">Contact granuloma</span> Medical condition

Contact granuloma is a condition that develops due to persistent tissue irritation in the posterior larynx. Benign granulomas, not to be confused with other types of granulomas, occur on the vocal process of the vocal folds, where the vocal ligament attaches. Signs and symptoms may include hoarseness of the voice, or a sensation of having a lump in the throat, but contact granulomas may also be without symptoms. There are two common causes associated with contact granulomas; the first common cause is sustained periods of increased pressure on the vocal folds, and is commonly seen in people who use their voice excessively, such as singers. Treatment typically includes voice therapy and changes to lifestyle factors. The second common cause of granulomas is gastroesophageal reflux and is controlled primarily through the use of anti-reflux medication. Other associated causes are discussed below.

Vocal cord paresis, also known as recurrent laryngeal nerve paralysis or vocal fold paralysis, is an injury to one or both recurrent laryngeal nerves (RLNs), which control all intrinsic muscles of the larynx except for the cricothyroid muscle. The RLN is important for speaking, breathing and swallowing.

Spasmodic dysphonia, also known as laryngeal dystonia, is a disorder in which the muscles that generate a person's voice go into periods of spasm. This results in breaks or interruptions in the voice, often every few sentences, which can make a person difficult to understand. The person's voice may also sound strained or they may be nearly unable to speak. Onset is often gradual and the condition is lifelong.

Puberphonia is a functional voice disorder that is characterized by the habitual use of a high-pitched voice after puberty, hence why many refer to the disorder as resulting in a 'falsetto' voice. The voice may also be heard as breathy, rough, and lacking in power. The onset of puberphonia usually occurs in adolescence, between the ages of 11 and 15 years, at the same time as changes related to puberty are occurring. This disorder usually occurs in the absence of other communication disorders.

<span class="mw-page-title-main">Laryngopharyngeal reflux</span> Medical condition

Laryngopharyngeal reflux (LPR) is the retrograde flow of gastric contents into the larynx, oropharynx and/or the nasopharynx. LPR causes respiratory symptoms such as cough and wheezing and is often associated with head and neck complaints such as dysphonia, globus pharyngis, and dysphagia. LPR may play a role in other diseases, such as sinusitis, otitis media, and rhinitis, and can be a comorbidity of asthma. While LPR is commonly used interchangeably with gastroesophageal reflux disease (GERD), it presents with a different pathophysiology.

<span class="mw-page-title-main">Voice therapy</span> Used to aid voice disorders or altering quality of voice

Voice therapy consists of techniques and procedures that target vocal parameters, such as vocal fold closure, pitch, volume, and quality. This therapy is provided by speech-language pathologists and is primarily used to aid in the management of voice disorders, or for altering the overall quality of voice, as in the case of transgender voice therapy. Vocal pedagogy is a related field to alter voice for the purpose of singing. Voice therapy may also serve to teach preventive measures such as vocal hygiene and other safe speaking or singing practices.

Laryngeal cysts are cysts involving the larynx or more frequently supraglottic locations, such as epiglottis and vallecula. Usually they do not extend to the thyroid cartilage. They may be present congenitally or may develop eventually due to degenerative cause. They often interfere with phonation.

Endoscopic laser cordectomy, also known as Kashima operation, is an endoscopic laser surgical procedure performed for treating the respiratory difficulty caused as a result of bilateral abductor vocal fold paralysis. Bilateral vocal fold paralysis is basically a result of abnormal nerve input to the laryngeal muscles, resulting in weak or total loss of movement of the laryngeal muscles. Most commonly associated nerve is the vagus nerve or in some cases its distal branch, the recurrent laryngeal nerve. Paralysis of the vocal fold may also result from mechanical breakdown of the cricoarytenoid joint. It was first described in by Kashima in 1989.

Thyroplasty is a phonosurgical technique designed to improve the voice by altering the thyroid cartilage of the larynx, which houses the vocal cords in order to change the position or the length of the vocal cords.

Arytenoid adduction is a surgical procedure used to treat vocal cord paralysis. A suture is used to emulate the action of the lateral cricoarytenoid muscle and position the paralyzed vocal cord closer to the midline. This allows the two vocal cords to meet and can improve speaking and swallowing ability for affected patients. Arytenoid adduction is often performed in conjunction with medialization thyroplasty.

Muscle tension dysphonia (MTD) was originally coined in 1983 by Morrison and describes a dysphonia caused by increased muscle tension of the muscles surrounding the voice box: the laryngeal and paralaryngeal muscles. MTD is a unifying diagnosis for a previously poorly categorized disease process. It allows for the diagnosis of dysphonia caused by many different etiologies and can be confirmed by history, physical exam, laryngoscopy and videostroboscopy, a technique that allows for the direct visualization of the larynx, vocal cords, and vocal cord motion.

<span class="mw-page-title-main">Feminization laryngoplasty</span>

Feminization laryngoplasty is a reconstructive surgery surgical procedure that results in the increase of the pitch of a patient, making the voice sound higher and more feminine. It is a form of Open Laryngoplasty and effectively reaches its goals via a Partial Laryngectomy of the anterior portion of the larynx, thereby diminishing the size of the larynx to cisgender female proportions. It also changes the vocal weight or resonance quality of the voice by diminishing the size of the larynx. It is a type of voice feminization surgery (VFS) and an alternative to vocal therapy. Feminization laryngoplasty is performed as a treatment for both transgender women and non-binary people as part of their gender transition, and women with androphonia. The surgery can be categorized into two main steps: Incision and vocal fold modification followed by thyrohyoid elevation. Risks and complications include granuloma, dysphonia and tracheostomy. Patients are recommended to follow perioperative management such as voice rest to hasten recovery.

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