![]() |
| General dictionary | Computing dictionary | Medical dictionary | Legal dictionary | Free encyclopedia | Hutchinson encyclopedia |
convulsion |
Word: |
Seizures (or convulsions) are temporary alterations in brain functions due to abnormal electrical activity of a group of brain
In the anatomy of animals, the brain, or encephalon, is the supervisory center of the nervous system. Although the brain is usually cited as the supervisory center of vertebrate nervous systems, the same term can also be used for the invertebrate central nervous system. In most animals, the brain is located in the head. | | valign="center" align="left" | | valign="center" align="center" width="250" | | | align="center" | mouse brain ..... Click the link for more information. cells that present with apparent clinical symptoms and findings. An isolated abnormal electrical activity recorded by an electroencephalography Electroencephalography is the neurophysiologic exploration of the electrical activity of the brain by the application of electrodes to the scalp. The resulting traces are known as an electroencephalogram (EEG) and represent so-called brain waves. This device is used to assess brain damage, epilepsy and other problems. EEG can also be used in conjunction with other types of brain imaging ..... Click the link for more information. examination without a clinical presentation is not called a seizure. Seizures can cause involuntary changes in body movement or function, sensation, awareness, or behavior. A seizure can last from a few seconds to a few minutes. There are more than 20 different types of seizures. Seizures are often associated with epilepsy Epilepsy (sometimes referred to as a seizure disorder) is a chronic neurological condition characterized by recurrent unprovoked seizures. The condition is named from the Greek epilepsia ("a taking hold of or seizing"). It is commonly controlled with medication, although experimental surgical methods are slowly gaining acceptance. In the past, epilepsy has been associated with religious experiences and even demonic possession. Historically, epilepsy was called the "Sacred Disease" because people thought that epileptic seizures were a form of attack by demons, and that the visions epileptics experienced were sent by the Gods. Hippocrates remarked that epilepsy would be considered divine only until it was understood . In the past, epilepsy has been associated with religious experiences and even demonic possession. Historically, epilepsy was called the "Sacred Disease" because people thought that epileptic seizures were a form of attack by demons, and that the visions epileptics experienced were sent by the Gods. Hippocrates remarked that epilepsy would be considered divine only until it was understood . Seizure is often associated with a sudden and involuntary contraction of a group of muscles. However, a seizure can also be as subtle as marching numbness of a part of body, a brief loss of memory
Memory is one of the activities of the human mind, much studied by cognitive psychology. It is the capacity to retain an impression of past experiences. There are multiple types of classifications for memory based on duration, nature and retrieval of perceived items. The main stages in the formation and retrieval of memory, from an information processing perspective, are:
..... Click the link for more information. , sparkling of flashes, sniffing an unpleasant odor, a strange epigastric sensation or a sensation of fear. Therefore seizures are typically classified as motor The adjective motor refers to a motoneuron. A motor is a device that converts energy into mechanical power, and is often synonymous with engine. The name is used by automakers (Ford Motor Company, General Motors, etc.), although this may also refer to the word 'motor' used widely in the early 20th century as an abbreviation for 'motor car', a synonym for automobile. See also:
..... Click the link for more information. , sensory Senses are the physiological methods of perception. The senses and their operation, classification, and theory are overlapping topics studied by a variety of fields, but most notably neuroscience, cognitive psychology (or cognitive science), and philosophy of perception. Definition of "sense"There is no firm agreement amongst neurologists as to exactly how many senses there
..... Click the link for more information. , emotional In psychology, and in ordinary language, emotion is used to describe a state of a person. Examples of emotions are fear, anger, joy, hate; see list of emotions. Emotional state is related to mood, sometimes even identified with it, although emotions are generally considered to be more transient than moods. Emotional state is sometimes thought of as being internal and unobservable. However, this is not an assertion which is supported by empirical evidence, since externally-visible changes almost always accompany emotional changes. Emotion is also sometimes regarded as the antithesis of reason; as is suggested by phrases such as The term cognition is used in several different loosely related ways. In psychology it is used to refer to the mental processes of an individual, with particular relation to a view that argues that the mind has internal mental states (such as beliefs, desires and intentions) and can be understood in terms of information processing, especially when a lot of abstraction or concretization is involved, or processes such as involving knowledge, expertise or learning for example are at work. It is also used in a wider sense to mean the act of knowing or knowledge, and may be interpreted in a social or cultural sense to describe the emergent development of knowledge and concepts within a group. Some seizure types are:
Symptoms experienced by a person during a seizure depend on where in the brain the disturbance in electrical activity occurs. Some seizures may be frightening to onlookers. A person having a tonic-clonic (grand mal) seizure may cry out, lose consciousness and fall to the ground, and convulse, often violently. A person having a complex partial seizure may appear confused or dazed and will not be able to respond to questions or direction. Some people have seizures that are not noticeable to others. Sometimes, the only clue that a person is having an absence (petit mal) seizure is rapid blinking or a few seconds of staring into space.
It is still disputable whether a febrile seizure A febrile seizure, also known as a fever fit or febrile convulsion is a generalized convulsion caused by elevated body temperature. They most commonly occur in children below the age of three years old and should not be diagnosed in children under the age of 6 months or over the age of 6 years. The cause is the rapidity of the rise in temperature, rather than the actual temperature reached. In the past, epilepsy has been associated with religious experiences and even demonic possession. Historically, epilepsy was called the "Sacred Disease" because people thought that epileptic seizures were a form of attack by demons, and that the visions epileptics experienced were sent by the Gods. Hippocrates remarked that epilepsy would be considered divine only until it was understood . In the past, epilepsy has been associated with religious experiences and even demonic possession. Historically, epilepsy was called the "Sacred Disease" because people thought that epileptic seizures were a form of attack by demons, and that the visions epileptics experienced were sent by the Gods. Hippocrates remarked that epilepsy would be considered divine only until it was understood .
An Aura is an optical effect wherein gas or dust surrounding an object luminesces or reflects light from the object. The visual disturbance seen by about half of all migraine sufferers is also called aura. Sufferers of repeated seizures (called epilepsy) often have a telltale sensation, often a strange light or unpleasant smell which comes before the actual seizure, called an aura.
Major causes of seizures include head trauma, infection, tumors, metabolic alterations (e.g. low or high blood glucose levels), and as part of the withdrawal symptoms associated with certain classes of addictive drugs, especially sedatives A sedative is a drug that depresses the central nervous system (CNS), which causes calmness, relaxation, reduction of anxiety, sleepiness, slowed breathing, slurred speech, staggering gait, poor judgment, and slow, uncertain reflexes. Sedatives may be referred to as tranquilizers, depressants, anxiolytics, soporifics, sleeping pills, downers, or sedative-hypnotics. At high doses or when they are abused, many of these drugs can cause unconsciousness and death. Barbiturates are derivatives of barbituric acid. Medical usesToday barbiturates are mainly used as anticonvulsants and for the induction of anesthesia.These barbiturates are available in the U.S.: ..... Click the link for more information. and benzodiazepines The benzodiazepines are a class of drugs with hypnotic, anxiolytic, anticonvulsive, amnestic and muscle relaxant properties. They are believed to act on the GABA receptor GABAA, the activation of which dampens higher neuronal activity. They began to be widely prescribed for stress-related ailments in the 1960s and 1970s. Benzodiazepines are often used for short-term relief of severe, disabling anxiety because their prolonged use can lead to tolerance and dependency. Seizures in pregnancy can be a sign of eclampsia Eclampsia is a serious complication of pregnancy and is characterised by convulsions. Usually eclampsia occurs after the onset of pre-eclampsia though sometimes no pre-eclamptic symptoms are recognisable. The convulsions may appear before, during or after labour, though cases of eclampsia after just 20 weeks of pregnancy have been recorded. Signs and symptomsThe majority of cases are heralded by pregnancy-induced hypertension and proteinuria but the only true sign of eclampsia is an eclamptic convulsion, of which there are four stages. Patients with edema and oliguria may develop renal failure or pulmonary oedema...... Click the link for more information. .
ManagementIf an individual has a grand mal seizure
Seizures (or convulsions) are temporary alterations in brain functions due to abnormal electrical activity of a group of brain cells that present with apparent clinical symptoms and findings. An isolated abnormal electrical activity recorded by an electroencephalography examination without a clinical presentation is not called a seizure. Breath is often used as a metaphor for life itself, and time of death is sometimes thought to be at the moment when breath stops (although countless people have 'come back' to life after breathing stops). Protection of the airways
..... Click the link for more information. is clear and open. This may be ensured by putting the individual into a semisupine position and applying strong upward pressure on the chin. Potentially sharp or dangerous objects should also be moved from the vicinity, so that the individual does not hurt him or herself.
External linkpreview not available. Click the link for more information. |
| References in classic literature: | More |
|---|---|
| In the very heart of an extinct volcano, the interior of which has been invaded by the sea, after some great convulsion of the earth. 20,000 Leagues Under The Sea by Verne, Jules View in context | |
| I had a vague belief that he was suffering from a fit, or some form of convulsion. Can Such Things Be? by Bierce, Ambrose View in context | |
| But to what did they owe the convulsion and rapture of their transport? Thus Spake Zarathustra: A Book For All And None by Nietzsche, Friedrich View in context | |
| Some articles mentioning "convulsion": |
|---|
| Free Encyclopedia Browser | Next |
|---|
| Full Dictionary Browser |
|---|
|