Speech And Learning Difficulties

Voice training is done to find an appropriate source of sound production that can be articulated for communication purposes. Criteria for selecting sound source include: degree of tissue loss, esophageal stenosis, physical limitations of the patient; noise level of the patient’s environment; motivation level; and patient’s preference of sound source.

Types Of Sound Source

There are mainly three types of sound source a patient can choose from. These are: external man-made prosthesis or artificial larynx; sphincter like junction of the pharynx and esophagus or esophageal speech; and lastly, surgically implanted device or transesophageal puncture and silicon prosthesis.

Artificial Larynx

The principle of artificial larynx is to have an external mechanical sound source that is substituted for the larynx. Anatomic structures for articulation and resonance are most of the time unaltered.

There are two general types of electrolarynges that are available: neck type and intra oral type. The neck type is placed flush to the skin on the side of the neck, under the chin, or on the cheek. Sound is conducted via the oropharynx and is articulated normally.

The intraoral type is used for patients that can’t conduct sound through skin adequately. A small tube is placed toward the posterior oral cavity, and the produced sound is then articulated. The tube has little effect on articulatory accuracy if the patient is taught properly and learns to use it well.

The advantage of artificial larynx is that voice is restored after surgery immediately and the maintenance of the hardware is minimal. The disadvantage however, is that the quality of sound may seem mechanical.

Esophageal Speech

The principle behind esophageal speech is that air is of greater pressure in one chamber (oral cavity) will flow to a chamber containing less pressure (esophagus), if these chambers are connected.

Goals of esophageal speech include: to be able to phonate upon demand, use a rapid method of air intake, short latency between air intake and phonation, produce four to nine syllables per air charge, achieve a speaking rate of 85-129 words per minute, and attain good speech intelligibility.

There are mainly three methods of esophageal speech. Injection is a method where air in the mouth/nose is compressed by lingual or labial movement and is injected into the esophagus. Swallowing method uses air that enters during oral opening when swallowing. The air is used to produce voice.

Inhalation method maintains a patent airway between the nose, lips and esophagus. The stoma is used for inhalation. Air enters the esophagus when the pharyngo-esophageal muscle is relaxed during inhalation.

The advantage of this kind of speech includes: no external devices, natural sounding speech, and the possibility of pitch and loudness control. Disadvantages on the other hand are: there is reduced length of utterance, is hard to learn and requires good articulation.

Transesophageal Speech

This is another approach to voice restoration. It requires a surgical/prosthesis procedure that makes use of a man-made device inserted into a surgically created midline transesophageal fistula.

Air is conducted from the trachea to the esophagus through the prosthesis to excite the pharyngo-esophageal segment for voice production.

Advantages include: rapid restoration, natural sound, normal utterance length, hands-free, minimal maintenance and intelligible tonal language. Disadvantages are: the need for surgery, puncture stenosis, candida growth, aspiration of foreign objects, and troubleshooting.

A speech therapist has a vital role in the pre- and post op management of laryngeal cancer, because Laryngectomy patients have to undergo speech management. So here are some of the things to know about laryngectomy.

A Team Approach

Firs off, the management of laryngeal cancer requires a team approach. The patient gets to see a surgeon, radiologist, audiologist, speech-language pathologist, oncologist, physical therapist, maxillofacial prosthodontist, and a psychiatrist. All of these health care professionals work together to work on the management of the patient.

What Is Laryngectomy?

Laryngectomy is the total removal of the larynx. It is also the partition of the airway from the nose, mouth, and esophagus. A person that undergoes this kind of operation would have to breathe via an opening on the neck, called stoma.

Laryngectomy is done when a person has laryngeal cancer. It may be considered to be a traditional way of managing laryngeal cancer, since a lot of laryngeal cancer cases nowadays are treated with the use of chemotherapy, radiation, or other laser procedures. In severe cases that these don’t work, that is the only time laryngectomy is opted for.

Other than the larynx, other structures are also removed. These other structures includes Sternocleidomastoid, Omohyoid muscle, Internal Jugular vein, Spinal Accessory vein (CNXI), Submaxillary salivary gland. In most severe cases, the external carotid artery, strap muscles of the neck, Vagus nerve (CN X), Hypoglossal nerve (CN XII) and the lingual branch of the Trigeminal nerve (CN V) are also removed.

How Common Is Laryngectomy?

It is estimated by the American Cancer Society, in 2003, that around nine thousand five hundred people in the US were diagnosed of laryngeal cancer. This condition occurs about 4.4 times more predominantly with men than with women. Though, similar with lung cancer, laryngeal cancer is becoming increasingly frequent with women.

Tobacco smoking is so far the supreme risk factor in having laryngeal cancer. Other factors include radiation exposure, asbestos exposure, alcohol abuse, and genetic factors. In United Kingdom, laryngeal cancer is rather rare, since it only affects less than 3,000 people per year.

Possible Problems

After total Laryngectomy, possible problems may occur. These include having a scar tissue at the tongue base, narrowing of the esophagus, partial tongue base resection, dysphagia, Xerostomia, mouth sores and changes in smell, taste, appetite and weight.

Effects And Impacts Of Laryngectomy

Laryngectomy has two mechanistic effects. One, it separates respiration from speech. Two, it keeps the pharyngoesophageal region intact.

There are also impacts that Laryngectomy brings about. The main impact would be the loss of voice for communication. You may also lose the ability to express emotions such as laughing. You also get physical problems with regard to tasting and feeding.

Laryngectomy is frequently successful in treating early-staged cancers. Still, undergoing through the procedure would require major lifestyle change. There is also a risk of having severe psychological stress due to unsuccessful adaptations.

After The Procedure: Voice Replacement And Care

After the patient’s larynx is removed, voice prosthetics is used. This serves as a replacement for the lost larynx, so that the person will still be able to communicate and speak. In this case, Laryngectomees would have to learn new methods of speaking.

They should also be constantly concerned in taking care and cleaning their stoma. Severe problems can arise if foreign materials and water enter their lungs via their unprotected stoma.