International Journal of Research Publication and Reviews, Vol 3, no 10, pp 95-98, October 2022 International Journal of Research Publication and Reviews Journal homepage: www.ijrpr.com ISSN 2582-7421 Review on Locked-in Syndrome Preeti Shanbhag 1 , Ramdas Bhat 2 1 UG Scholar, Department of Pharmacology, Karavalo college of Pharmacy, Vamanjoor (Post), Mangalore, Karnataka, India. 2 Associate Professor, Department of Pharmacology, Karavali college of Pharmacy, Vamanjoor (Post) Mangalore, Karnataka, India ABSTRACT The locked-in syndrome (pseudocoma) defines people who are awake and conscious but selectively deafferented, i.e., have no means of creating speech, limb, or facial movements. It is most commonly caused by acute ventral pontine lesions. People with such brainstem lesions frequently remain unconscious for days or weeks, requiring artificial respiration, before eventually awakening but remaining paralysed and mute, seemingly resembling patients in a vegetative state or akinetic mutism. It has been demonstrated that more than half of the time, the family, rather than the physician, is the first to notice that the patient is aware... Clinicians must be familiar with the disease because there is a high risk of incorrect diagnosis, such as coma or vegetative state, following a lengthy unconscious state. It is frequently relatives or caregivers that first notice the aware state and remark that the patient may communicate through his eyes. There has recently been an upsurge in public awareness of this rare ailment, and more cases have been reported. Keywords: Locked-in Syndrome (LiS), Electroencephalogram (EEG), amyotrophic lateral sclerosis (ALS), Patterson and Grabios' analysis Introduction 1-11 The phrase "Locked in Syndrome" was coined by Plum and Posner in 1966 to describe a neurological disease known as ventral pons infarction. Quadriplegia, inferior cranial nerve paralysis, and aphonic support with just an upward glance and eyelid mobility serve as metaphors for the condition. Because consciousness is still intact, the patient is able to talk appropriately and coherently through eye blinking. Patients suffering with locked in syndrome are imperceptibly trapped inside the human body, aware of their surroundings but with limited communication abilities. Once consciousness was restored, LiS was categorized as quadriplegia and anarthria in 1986. LiS is caused by all-four-limb palsy, anarthria, and lower nerve loss caused by a brain stem lesion. Anarthria is caused by bilateral paralysis of the laryngeal facio-glossopharyngo. The "locked-in" state is described by various words in the literature. "Locked-in syndrome," "de-efferented state," and "pseudocoma" are all identical phrases. "Ventral brainstem syndrome ventral pontine syndrome Cerebro medulla spinal disconnection “Mortality can be decreased with early rehabilitation and more effective medical care”. Even when LIS patients have serious physical impairments and are medically stable, their life expectancy can be enhanced as a result. LIS 12 Locked-in syndrome (LiS) has three main types, or forms, including: • The classic form: If you have this type of LiS, you are completely immobile (loss of voluntary movement), but you can still blink and move your eyes vertically (up and down). You still retain your regular cognitive functions. You may hear as well. • The incomplete form: This sort of LiS is identical to the classical version except that specific parts of your body can have movement and feeling functions. • Complete body paralysis and lack of eye movement are symptoms of the total immobility variant of LiS, but cognitive function is unaffected. An electroencephalogram (EEG), a test that records brain waves, can be used to examine cortical function to determine whether a patient with this kind still maintains cognitive (thinking and reasoning) function. Etiology 13,14 Most frequently, damage to the pons, a specific region of the brainstem, results in locked-in syndrome. Important neural connections between the cerebrum, spinal cord, and cerebellum are found in the pons. All the motor fibres that travel from the brain's grey matter through the spinal cord to the body's muscles are cut off in locked-in syndrome, and there is also damage to the brainstem regions crucial for speech and facial control. Trauma is a less frequent cause of damage to the pons than tissue loss due to lack of blood supply (infarct) or bleeding (haemorrhage). A blood clot (thrombosis) or stroke are two examples of the many diverse disorders that can result in an infarct. The loss of the myelin sheathing that surrounds nerve cells (myelinolysis),