Aphasia

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Aphasia Classification and external resources
ICD-10	F80.0-F80.2, R47.0
ICD-9	315.31, 784.3
DiseasesDB	4024
MedlinePlus	003204
eMedicine	neuro/437
MeSH	D001037

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Overview

Aphasia (or aphemia) is a loss of the ability to produce and/or comprehend language, due to injury to brain areas specialized for these functions. It is not a result of deficits in sensory, intellect, or psychiatric functioning. (Brookshire, 1992; Goodglass 1993) It is also not muscle weakness or a cognitive disorder.

Depending on the area and extent of the damage, someone suffering from aphasia may be able to speak but not write, or vice versa, or display any of a wide variety of other deficiencies in language comprehension and production, such as being able to sing but not speak. Aphasia may co-occur with speech disorders such as dysarthria or apraxia of speech, which also result from brain damage.

Causes

Usually, aphasias are a result of damage (lesions) to the language centres of the brain (like Broca's area). These areas are almost always located in the left hemisphere, and in most people this is where the ability to produce and comprehend language is found. However, in a very small number of people language ability is found in the right hemisphere. In either case, damage to these language areas can be caused by a stroke, traumatic brain injury, or other head injury. Aphasia may also develop slowly, as in the case of a brain tumor or progressively neurological disease. It may also be caused by a sudden hemorrhagic event within the brain.

Prognosis

The prognosis of those with aphasia varies widely, and is dependent upon age of the patient, site and size of lesion, and type of aphasia.

Diagnosis

Aphasia can be assessed in a variety of ways, from quick clinical screening at the bedside to several-hour-long batteries of tasks that examine the key components of language and communication.

Symptoms

Any of the following can be considered symptoms of aphasia:

• inability to comprehend language
• inability to pronounce, not due to muscle paralysis or weakness
• inability to speak spontaneously
• inability to form words
• inability to name objects
• poor enunciation
• excessive creation and use of personal neologisms
• inability to repeat a phrase
• persistent repetition of phrases
• paraphasia (substituting letters, syllables or words)
• agrammatism (inability to speak in a grammatically correct fashion)
• dysprosody (alterations in inflexion, stress, and rhythm)
• uncompleted sentences
• inability to read
• inability to write

Laboratory Findings

• Complete blood count (CBC)
• Calcium
• Glucose
• Blood urea nitrogen (BUN)/creatinine
• Vitamin B12
• Rapid plasma reagin (RPR)

Electrolyte and Biomarker Studies

• Electrolytes

MRI and CT

• Cerebral imaging critical.
• MRI has highest specificity and sensitivity

Other Imaging Findings

• Normal brain imaging
• Electroencephalogram (EEG)

Other Diagnostic Studies

• Psychometric testing (dementia)
• Toxicology screen
• Cerebrospinal fluid (CSF) analysis

Types of aphasia

The following table summarizes some major characteristics of different types of aphasia:

Type of aphasia	Repetition	Naming	Auditory comprehension	Fluency	Presentation
Wernicke's aphasia	mild–mod	mild–severe	defective	fluent paraphasic	Individuals with Wernicke's aphasia may speak in long sentences that have no meaning, add unnecessary words, and even create new "words" (neologisms). For example, someone with Wernicke's aphasia may say, "You know that smoodle pinkered and that I want to get him round and take care of him like you want before", meaning "The dog needs to go out so I will take him for a walk". They have poor auditory and reading comprehension, and fluent, but nonsensiscal, oral and written expression. Individuals with Wernicke's aphasia usually have great difficulty understanding the speech of both themselves and others and are therefore often unaware of their mistakes. They are also often unaware of their surroundings, and may present a risk to themselves and others around them.
Transcortical sensory aphasia	good	mod–severe	poor	fluent	Similar deficits as in Wernicke's apahsia, but repetition ability remains intact.
Conduction aphasia	poor	poor	relatively good	fluent	Caused by damage to the arcuate fasciculus, the structure that transmits information between Wernicke's area and Broca's area. Auditory comprehension is near normal, and oral expression is fluent with occasional paraphasic errors. Repetition ability is poor.
Anomic aphasia	mild	mod–severe	mild	fluent	Anomic aphasia, is essentially a difficulty with naming. The patient may have difficulties naming certain words, linked by their grammatical type (e.g. difficulty naming verbs and not nouns) or by their semantic category (e.g. difficulty naming words relating to photography but nothing else) or a more general naming difficulty. Patients tend to produce grammatic, yet empty, speech. Auditory comprehension tends to be preserved.
Broca's aphasia	mod–severe	mod–severe	mild difficulty	non-fluent, effortful, slow	Individuals with Broca's aphasia frequently speak short, meaningful phrases that are produced with great effort. Broca's aphasia is thus characterized as a nonfluent aphasia. Affected people often omit small words such as "is", "and", and "the". For example, a person with Broca's aphasia may say, "Walk dog" meaning, "I will take the dog for a walk". The same sentence could also mean "You take the dog for a walk", or "The dog walked out of the yard", depending on the circumstances. Individuals with Broca's aphasia are able to understand the speech of others to varying degrees. Because of this, they are often aware of their difficulties and can become easily frustrated by their speaking problems. It is associated with right hemiparesis, meaning that there will be paralysis of the patient's right arm, leg, and face.
Transcortical motor aphasia	good	mild–severe	mild	non-fluent	Similar deficits as Broca's aphasia, except repetition ability remains intact. Auditory comprehension is generally fine for simple conversations, but declines rapidly for more complex conversations. It is associated with right hemiparesis, meaning that there will be paralysis of the patient's right arm, leg, and face.
Global aphasia	poor	poor	poor	non-fluent	Individuals with global aphasia have severe communication difficulties and will be extremely limited in their ability to speak or comprehend language. They may be totally nonverbal, and/or only use facial expressions and gestures to communicate. It is associated with right hemiparesis, meaning that there will be paralysis of the patient's right arm, leg, and face.
Transcortical mixed aphasia	moderate	poor	poor	non-fluent	Similar deficits as in global apahsia, but repetition ability remains intact.
Subcortical aphasias					Characteristics and symptoms depend upon the site and size of subcortical lesion. Possible sites of lesions include the thalamus, internal capsule, and basal ganglia.

Classification of aphasia

Classifying the different subtypes of aphasia is difficult and has led to disagreements among experts. The locationist model is the original model, but modern anatomical techniques and analyses have shown that precise connections between brain regions and symptom classification don't exist. The neural organization of language is complicated; language is a comprehensive and complex behavior and it makes sense that it isn't the product of some small, circumscribed region of the brain.
No classification of patients in subtypes and groups of subtypes is adequate. Only about 60% of patients will fit in a classification scheme such as fluent/nonfluent/pure aphasias. There is a huge variation among patients with the same diagnosis, and aphasias can be highly selective. For instance, patients with naming deficits (anomic aphasia) might show an inability only for naming buildings, or people, or colors. ^[1]

The locationist model

The locationist model attempts to classify the aphasia by major characteristics and then link these to areas of the brain in which the damage has been caused. The initial two categories here were devised by early neurologists working in the field, namely Paul Broca and Carl Wernicke. Other researchers have added to the model, resulting in it often being referred to as the "Boston-Neoclassical Model". The most prominent writers on this topic have been Howard Goodglass and Edith Kaplan.

• Individuals with Broca's aphasia (also termed expressive aphasia) were once thought to have ventral temporal damage though more recent work by Nina Dronkers using imaging and 'lesion analysis' has revealed that patients with Broca's Aphasia have lesions to the medial insular cortex. Broca missed these lesions because his studies did not disect the brains of diseased patients so only the more temporal damage was visible. Individuals with Broca's aphasia often have right-sided weakness or paralysis of the arm and leg because the frontal lobe is also important for body movement.

• In contrast to Broca's aphasia, damage to the temporal lobe may result in a fluent aphasia that is called Wernicke's aphasia (also termed sensory aphasia). These individuals usually have no body weakness because their brain injury is not near the parts of the brain that control movement.

• Working from Wernicke's model of aphasia, Ludwig Lichtheim proposed five other types of aphasia but these were not tested against real patients until modern imaging made more indepth studies available. The other five types of aphasia in the locationist model are:

1. Pure word deafness
2. Conduction aphasia
3. Apraxia of speech, which is now considered a separate disorder in itself.
4. Transcortical motor aphasia
5. Transcortical sensory aphasia

• Anomia is another type of aphasia proposed under what is commonly known as the Boston-Neoclassical model, which is essentially a difficulty with naming. A final type of aphasia, global aphasia, results from damage to extensive portions of the language areas of the brain.

Fluent, non-fluent and "pure" aphasias

The different types of aphasia can be divided into three categories: fluent, non-fluent and "pure" aphasias.^[2]

• Fluent aphasias, also called receptive aphasias, are impairments related mostly to the input or reception of language, with difficulties either in auditory verbal comprehension or in the repetition of words, phrases, or sentences spoken by others. Speech is easy and fluent, but there are difficulties related to the output of language as well, such as paraphasia. Examples of fluent aphasias are: Wernicke's aphasia, Transcortical sensory aphasia, Conduction aphasia, Anomic aphasia

• Nonfluent aphasias, also called expressive aphasias are difficulties in articulating, but in most cases there is relatively good auditory verbal comprehension. Examples of nonfluent aphasias are: Broca's aphasia, Transcortical motor aphasia, Global aphasia

• "Pure" aphasias are selective impairments in reading, writing, or the recognition of words. These disorders may be quite selective. For example, a person is able to read but not write, or is able to write but not read. Examples of pure aphasias are: Alexia, Agraphia, Pure word deafness

The cognitive neuropsychological model

The cognitive neuropsychological model builds on cognitive neuropsychology. It assumes that language processing can be broken down into a number of modules, each of which has a specific function. Hence there is a module which recognises phonemes as they are spoken and a module which stores formulated phonemes before they are spoken. Use of this model clinically involves conducting a battery of assessments (usually from the PALPA), each of which tests one or a number of these modules. Once a diagnosis is reached as to where the impairment lies, therapy can proceed to treat the individual module.

A few less common subtypes include:

• Subcortical motor aphasia
• Subcortical sensory aphasia
• Mixed transcortical aphasia
• Acquired eleptiform aphasia (Landau Kleffner Syndrome)

A combination of subtypes is possible.

Primary and secondary aphasia

Aphasia can be divided into primary and secondary aphasia.^[3]

• Primary aphasia is due to problems with language-processing mechanisms.
• Secondary aphasia is the result of other problems, like memory impairments, attention disorders, or perceptual problems.

Complete List of Differential Diagnosis of Aphasia

• Alzheimer's dementia
• Aortic Arch Syndrome
• Brain tumors
• Dissociative state
• Hemorrhage
• Herpes Encephalitis
• Nonconvulsive status epilepticus
• Poliomyelitis
• Postconcussion syndrome
• Rasmussen's Encephalitis
• Sedative-hypnotic drug intoxication
• Senile dementia
• Sensorineural hearing loss
• Severe hypoglycemia
• Stroke
• Subdural hematoma
• Temporal lobe abscess
• Temporal lobe atrophy
• Tertiary syphilis
• Thromboangitis obliterans
• Transient ischemic attacks
• Trauma

  • Head trauma: gunshot wound, blows to the head, other brain injury due to trauma

Types of Aphasia

• Anomic aphasia
• Conduction aphasia
• Expressive (Broca's) aphasia
• Receptive (Wernicke's) aphasia
• Transcortical motor aphasia
• Transcortical sensory aphasia ^{[4] [5]}

Treatment

• Speech therapy
• Correction of underlying etiology

Pharmacotherapy

Acute Pharmacotherapies

• IV acyclovir (viral encephalitis)
• Acetylcholinesterase inhibitors (dementia)
• Anticoagulation (embolic stroke)
• Antiplatelet therapy (thrombotic stroke)
• IV lorazepam, anticonvulsants (status epilepticus)
• IV or oral benzodiazepines (dissociative state)

See also

• Speech disorder
• Dysnomia disorder

Sources

Academic references

• R. Chapey (Ed.) (2001). Language Intervention Strategies in Aphasia and Related Neurogenic Communication Disorders (Fourth Edition). Philadelphia: Lippincott, Williams & Wilkins.
• Goodglass, H. & Kaplan, E. (1972). Assessment of Aphasia and Related Disorders. Philadelphia: Lea and Febinger.
• Kay, J., Lesser, R., & Coltheart, M. (1992). Psycholinguistic Assessments of Language Processing in Aphasia (PALPA). Hove: Erlbaum.
• Spreen, O. & Risser, A.H. (2003). Assessment of Aphasia. New York: Oxford University Press.

Personal experiences of aphasia

• Hale, S (2003), The Man Who Lost His Language, Penguin.
• Paul E. Berger and Stephanie Mensh, How to Conquer the World With One Hand...And an Attitude, 2nd Ed., ISBN 0-9668378-7-8
• Cindy Greatrex (2005) Aphasia in the Deaf Community.
• Dardick, Geeta (1991), Prisoner of Silence, Reader's Digest, June issue

References

External links

• American Speech-Language-Hearing Association Description of aphasia and the role of the speech-language pathologist in assessment and treatment.
• Aphasia Center of California in Oakland, CA, U.S.
• The Aphasia Institute Pat Arato Aphasia Center
• NIDCD health information: Aphasia (public domain source)
• "In So Many Words" Radio documentary broadcast on the Canadian Broadcasting Corporation's "The Sunday Edition" program on Sunday, December 15, 2002
• "Picturing Aphasia" Documentary film about aphasia that uses drawings to help bridge the gap between hearing, seeing, and comprehending. Directed by Mores McWreath.
• Description of four types of aphasia: auditory, afferent, efferent, and semantic at University of Washington
• National Aphasia Association (U.S.)
• Aphasia Project: Research into assistive devices for people with aphasia (Princeton University)
• UK Based advice on aphasia and a forum for aphasics

v • d • e Symptoms and signs (R00-R69, 780-789)
Circulatory and respiratory systems	Tachycardia - Bradycardia - Palpitation - Heart murmur - Nosebleed - Hemoptysis - Cough - abnormalities of breathing (Dyspnea, Orthopnoea, Stridor, Wheeze, Cheyne-Stokes respiration, Hyperventilation, Mouth breathing, Hiccup, Bradypnea, Hypoventilation) - Chest pain - Asphyxia - Pleurisy - Respiratory arrest - Sputum - Bruit
Digestive system and abdomen	Abdominal pain - Acute abdomen - Nausea - Vomiting - Heartburn - Dysphagia - Flatulence - Burping - Fecal incontinence - Encopresis - Hepatomegaly - Splenomegaly - Hepatosplenomegaly - Jaundice - Ascites - Fecal occult blood - Halitosis
Skin and subcutaneous tissue	disturbances of skin sensation (Hypoesthesia, Paresthesia, Hyperesthesia) - Rash - Cyanosis - Pallor - Flushing - Petechia - Desquamation - Induration
Nervous and musculoskeletal systems	abnormal involuntary movements (Tremor, Spasm, Fasciculation, Athetosis) - Gait abnormality - lack of coordination (Ataxia, Dysmetria, Dysdiadochokinesia, Hypotonia) - Tetany - Meningism - Hyperreflexia
Urinary system	Dysuria - Vesical tenesmus - Urinary incontinence - Urinary retention - Oliguria - Polyuria - Nocturia
Cognition, perception, emotional state and behaviour	Anxiety - Somnolence - Coma - Amnesia (Anterograde amnesia, Retrograde amnesia) - Dizziness/Vertigo - smell and taste (Anosmia, Ageusia, Parosmia, Parageusia)
Speech and voice	speech disturbances (Dysphasia, Aphasia, Dysarthria) - symbolic dysfunctions (Dyslexia, Alexia, Agnosia, Apraxia, Acalculia, Agraphia) - voice disturbances (Dysphonia, Aphonia)
General symptoms and signs	Fever (Hyperpyrexia) - Headache - Chronic pain - Malaise - Fatigue - Fainting (Vasovagal syncope) - Febrile seizure - Shock (Cardiogenic shock) - Lymphadenopathy - Edema (Peripheral edema, Anasarca) - Hyperhidrosis (Sleep hyperhidrosis) - Delayed milestone - Failure to thrive - food and fluid intake (Anorexia, Polydipsia, Polyphagia) - Cachexia - Xerostomia - Clubbing

v • d • e WHO ICD-10 mental and behavioural disorders (F · 290–319)
Neurological/symptomatic	Dementia (Alzheimer's disease, multi-infarct dementia, Pick's disease, Creutzfeldt-Jakob disease, Huntington's disease, Parkinson's disease, AIDS dementia complex, Frontotemporal dementia) · Delirium · Post-concussion syndrome
Psychoactive substance	Intoxication (drunkenness) · Physical dependence (alcohol dependence, opioid dependency, cocaine dependence) · Withdrawal (benzodiazepine withdrawal, delirium tremens) · Amnesic: (Korsakoff's syndrome)
Psychotic disorder	Schizophrenia (disorganized schizophrenia) · Schizotypal personality disorder · Delusional disorder · Folie à deux · Schizoaffective disorder
Mood (affective)	Mania · Bipolar disorder · Clinical depression · Cyclothymia · Dysthymia
Neurotic, stress-related and somatoform	Agoraphobia · Anxiety disorder · Panic disorder · Generalized anxiety disorder · Social Anxiety Disorder · OCD · Acute stress reaction · PTSD · Adjustment disorder · Conversion disorder (Ganser syndrome) · Somatoform disorder · Somatization disorder · Neurasthenia
Physiological/physical behavioural	Eating disorder (anorexia nervosa, bulimia nervosa) · Sleep disorder (dyssomnia, insomnia, hypersomnia, parasomnia, night terror, nightmare) · Sexual dysfunction (erectile dysfunction, premature ejaculation, vaginismus, dyspareunia, hypersexuality) · Postpartum depression
Adult personality and behaviour	Personality disorder · Passive-aggressive behavior · Kleptomania · Trichotillomania · Voyeurism · Factitious disorder · Munchausen syndrome · Ego-dystonic sexual orientation
Mental retardation	Mental retardation
Psychological development (developmental disorder)	Specific: speech and language (expressive language disorder, aphasia, expressive aphasia, receptive aphasia, Landau-Kleffner syndrome, lisp) · Scholastic skills (dyslexia, dysgraphia, Gerstmann syndrome) · Motor function (developmental dyspraxia) Pervasive: Autism · Rett syndrome · Asperger syndrome
Behavioural and emotional, childhood and adolescence onset	ADHD · Conduct disorder · Oppositional defiant disorder · Separation anxiety disorder · Selective mutism · Reactive attachment disorder · Tic disorder · Tourette syndrome · Speech (stuttering · cluttering)

v • d • e WikiDoc Research Resources for Aphasia (Click show to right to view)
Articles on Aphasia	Most recent articles on Aphasia • Most cited articles on Aphasia • Review articles on Aphasia • Articles on Aphasia in N Eng J Med, Lancet, BMJ
Media (Slides, Video, Images, MP3) on Aphasia	Powerpoint slides on Aphasia • Images of Aphasia • Photos of Aphasia • Podcasts & MP3s on Aphasia • Videos on Aphasia
Evidence Based Medicine Regarding Aphasia	Cochrane Collaboration on Aphasia • Bandolier on Aphasia • TRIP on Aphasia
Cost Effectiveness of Aphasia	Cost Effectiveness of Aphasia
Clinical Trials Involving Aphasia	Ongoing Trials on Aphasia at Clinical Trials.gov • Trial results on Aphasia • Clinical Trials on Aphasia at Google
Guidelines / Policies / Government Resources (FDA/CDC) Regarding Aphasia	US National Guidelines Clearinghouse on Aphasia • NICE Guidance on Aphasia • NHS PRODIGY Guidance • FDA on Aphasia • CDC on Aphasia
Textbook Information on Aphasia	Books and Textbook Information on Aphasia
Pharmacology Resources on Aphasia	Dosing of Aphasia • Drug interactions with Aphasia • Side effects of Aphasia • Allergic reactions to Aphasia • Overdose information on Aphasia • Carcinogenicity information on Aphasia • Aphasia in pregnancy • Pharmacokinetics of Aphasia •
Genetics, Pharmacogenomics, and Proteinomics of Aphasia	Genetics of Aphasia • Pharmacogenomics of Aphasia • Proteomics of Aphasia
Newstories on Aphasia	Aphasia in the news • Be alerted to news on Aphasia • News trends on Aphasia
Commentary on Aphasia	Blogs on Aphasia
Patient Resources on Aphasia	Patient resources on Aphasia • Discussion groups on Aphasia • Patient Handouts on Aphasia • Directions to Hospitals Treating Aphasia • Risk calculators and risk factors for Aphasia
Healthcare Provider Resources on Aphasia	Symptoms of Aphasia • Causes & Risk Factors for Aphasia • Diagnostic studies for Aphasia • Treatment of Aphasia
Continuing Medical Education (CME) Programs on Aphasia	CME Programs on Aphasia
International Resources on Aphasia	Aphasia en Espanol • Aphasia en Francais
Business Resources on Aphasia	Aphasia in the Marketplace • Patents on Aphasia
Informatics Resources on Aphasia	List of terms related to Aphasia

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .