While a pressure ulcer is an indication of negligence and abuse in nursing home care, Kennedy terminal ulcers arise on their own and offer a critical indication of a persons health decline, oftentimes signaling the dying process. This makes the skin more vulnerable to pressure and injury in regions of bony prominences and favors the emergence of a Kennedy terminal ulcer. The Kennedy terminal ulcer alive and well. These are marked by various changes in responsiveness and functioning. What are the signs of someone actively dying? Breathing may become irregular with periods of no breathing or apnea lasting 20-30 seconds. A Kennedy Terminal Ulcer, also known as a Kennedy Ulcer, is a form of bed sore (also known as a pressure sore, pressure ulcer, or decubitus ulcer) that has a quick start and rapid tissue disintegration. A wound consultant or nurse may also be consulted. Always consult a medical provider for diagnosis and treatment. Beldon, P. (2011). A health care team may administer painkillers and care materials, such as soft cushions. The later Kennedy ulcer stages will generally include darker blackish colors and swollen skin which itself is a sign of tissue death. Depending on where the ulcer is, this might involve placing a soft cushion under the affected area. DOI: Roca-Biosca A, et al. Implementing a pressure ulcer prevention program and enhancing the role of the CWOCN: impact on outcomes. As such, it can be difficult to identify a Kennedy ulcer. These include the heart and brain, but not organs such as the skin. Research is limited but the literature suggests that The death of the Kennedy terminal ulcer. Although Jess has been working with terminally patients for several years, she is always surprised to find Kennedy Terminal Ulcers when caring for her patients. Thoughts like difficulty concentrating, confusion, or. What happens if a girl calls your bro? He is a member of a national law firm with attorneys who hold licenses in nearly a dozen states. depression following the death of a loved one, researchgate.net/publication/313690932_Poly_Ulceration_Patient_Terminal_Kennedy_Terminal_Ulcer_KTU, 11 Signs of Death and Ways to Help Your Loved Ones, Coping with Depression After a Loved Ones Death, Understanding Therapy for Grief and How It Can Help, Hypertrophic Scars and Keloids: Similarities and Differences, Debra Sullivan, Ph.D., MSN, R.N., CNE, COI. For early-stage foot and toe ulcers, nonsurgical treatments might work. A Kennedy ulcer more often than not is a bed sore seen at end of life. How do you know when death is hours away? If a nursing home is telling you that your family or friend has a Kennedy ulcer or died with a Kennedy ulcer, all kinds of red flags should be going up. Apply antimicrobial ointment to prevent infection. A Kennedy terminal ulcer is a skin wound that appears in some people during their final weeks of life.The term "Kennedy terminal ulcer" was first used in 1989. Patients with these wounds must be evaluated by their primary care provider. Jess is a hospice nurse who makes home visits to patients who are terminally ill and entering the dying process. Federal Bar No. Grief is different for everyone. eCollection 2016. If youre having trouble dealing with your emotions, talk to your doctor. Why? There are three main stages of dying: the early stage, the middle stage and the last stage. To help reduce pain, pressure-relieving dressings and surfaces may be used. Important Notice: The contents of the website such as text, graphics, images, and other materials contained on the website ("Content") are for informational purposes only. The ulcer often appears on the sacral region, but it can appear elsewhere. Our experts continually monitor the health and wellness space, and we update our articles when new information becomes available. Bedsores also called pressure ulcers and decubitus ulcers are injuries to skin and underlying tissue resulting from prolonged pressure on the skin. Ensure the patient's comfort as best as possible. If youre caring for a dying family member or close friend, make sure to take care of yourself, too. If the results confirm a Kennedy ulcer, the doctor may offer coping tips. He is dedicated to fighting for justice, and welcomes the opportunity to help you. Neither of these are true in most Kennedy ulcer cases as those with a Kennedy ulcer are expected to die, not as a result of the Kennedy ulcer, but because of end of life deterioration overall. Living bacteria in the body, particularly in the bowels, play a major role in this decomposition process, or putrefaction. (2016). If you have this type of ulcer, you should talk with your health care provider about possible treatments. In some cases, symptoms of system dysfunction may reflect on the skin. Kennedy Terminal Ulcer and Skin Failure, Where Are the Data? It begins with a superficial skin loss which develops into a black or yellow necrotic wound. In time, the heart stops and they stop breathing. Kennedy terminal ulcers typically appear on your sacrum. Without further instruction in the code set, coders assign the default code for pressure ulcers. These skin wounds can appear and develop over a few hours. Loss of Appetite. WebMD does not provide medical advice, diagnosis or treatment. Ostomy Wound Manage. Unlike pressure ulcers, so named because they occur as a result of pressure, specifics like location, shape, and onset help to determine an actual KTU diagnosis. : #1212110211 What are 5 physical signs of impending death? What do the last hours of life look like? Kennedy ulcers often appear in the shape of a pear, butterfly, horseshoe, or some irregular shape. It is thought that during the dying process, blood perfusion goes mainly to organs such as the heart and brain and is very limited in the skin organ. Research is limited but the literature suggests that KTUs are typically pear-shaped, red/yellow/black, similar in appearance to an abrasion, and tend to occur suddenly in the sacral/coccygeal region not long before death. Keloids and hypertrophic scars are similar in many ways but differ in their risk factors, treatment, and outlook. As the patient becomes weaker and/or loses consciousness, they can lose the ability to clear their throat or swallow. Also, well explore how to diagnose a Kennedy ulcer. The https:// ensures that you are connecting to the Despite it being very rare to see these kinds of ulcers in patients, they appear in geriatric terminally ill patients. Pressure injuries (PIs) typically are the result of unrelieved pressure, shear, or force. Home | About | Contact | Copyright | Privacy | Cookie Policy | Terms & Conditions | Sitemap. Some clinicians hold that the KTU is part of the dying process and is not related to pressure. Would you like email updates of new search results? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); If you need a nursing home abuse lawyer to help answer questions about a loved one in a nursing home, investigation inquiries about a specific nursing facility, or want to request that I write an article on a topic of your choosing, contact me via this contact form. This site needs JavaScript to work properly. Kennedy-Evans identified this specific type of skin breakdown in dying patients that is a harbinger of an early death.These ulcers can start as a large discolored blister and transform into a Stage IV ulcer within hours. However, it is important to keep mind that the timing of each stage and the symptoms experienced can vary from person to person. Ostomy Wound Manage. The ulcer did not respond to treatment and the resident died 6 weeks following ulcer development. Supporting Literature, Citations & Research. What causes them, and what you can do about them. 8600 Rockville Pike Kennedy terminal ulcer is specific to terminal patients in the late stages of the dying process. Lindsay is the 2011 recipient of the Dorland Health People's Award in the category of 'Wound Ostomy Continence nurse' and has been recognized in Case In Point Magazine as being one of the "Top People in Healthcare" for her "passionate leadership and an overall holistic approach to medicine. What you see is what you treat. Sometimes grief can turn into depression. Improving end-of-life care in the intensive care unit: what's to be learned from outcomes research? (2010). Miller, S. M. (2017). About the Author In this article, well explain what the symptoms of this ulcer are. moment and diagnosis. Kennedy terminal ulcer: The "ah-ha!" Often, theyre described as looking like a butterfly or being pear or horseshoe shaped. What is the difference between pressure ulcer and Kennedy ulcer? The skin may be healthy in the morning. There are three main stages of dying: the early stage, the middle stage and the last stage. This is all to say that, Kennedy Ulcers are in some sense an end of life bed sore, or at least in lay terms are sometimes called that. In most cases, a Kennedy ulcer does not respond to treatment, and its symptoms do not improve. Kennedy terminal ulcers, a subset of pressure injuries, are associated with the dying process. Charcoal-infused dressings may be used to help manage odors from the ulcers.. Signs and Treatment, How to Get Rid of a Black Eye: Everything to Know, 7 Symptoms Never to Ignore If You Have Depression. Death might occur in a few days or weeks. Save my name, email, and website in this browser for the next time I comment. Generally, it starts out looking like a butterfly shaped deep tissue injury (DTI) or like an abrasion on the sacrum. I feel like its a lifeline. October 1, 2009. The sore expands into deeper layers of the skin. State Bar No. Stage 4 Bedsore is the last and most serious stage of all bedsores. A Kennedy ulcer can have multiple stages which range in the same way that a bruise would range. Treatment options for a Kennedy ulcer are limited. This is because the blood is directed to more vital organs, like the heart and the brain. Our website services, content, and products are for informational purposes only. Whenever you are ready, I am here for you. A physician may refer the patient to a wound specialist to help manage the condition. How do you code a Kennedy ulcer? This is a real problem, and nursing homes will do this and many other shady and unethical things to hide their bad acts. Your loved one may seem to be working hard to breathe even making a moaning sound. Not everyone experiences these ulcers in their final days and hours, but theyre not uncommon. Try to allow others to support you by pitching in with everyday tasks, such as cooking and cleaning. The website nursinghometruth.com has the following Registry Domain ID: 2623610695_DOMAIN_COM-VRSN, and its registrant's Whois admin and owner is Reza Davani, Nursing Home Truth, 4414 Falls Bridge Drive #A, Baltimore, MD 21211-1379. Location: KTUs develop at the sacrum, or the tailbone, just above the buttocks and at the base of the spine. http://www.kennedyterminalulcer.com/. They will run their course even if a person receives adequate care. All rights reserved. 7,752,060 and 8,719,052. Kennedy ulcers can be hard to differentiate from other pressure-based injuries. Treatment instead focuses on dignity and comfort in the last weeks of life. Cathy Thomas Hess, BSN, RN, CWOCN and Dr. Lisa Gould, MD, PhD, FACS. In March of 1989 the National Pressure Ulcer Advisory Panel (NPUAP) convened, during which Karen Lou Kennedy first described the Kennedy Terminal Ulcer (KTU) phenomenon. Therefore, clinicians could not tell Kennedy ulcers apart from other similar sores. According to current evidence, 60 percent of deaths occurred between 2 A.M and 8 A.M, it is therefore likely that such connections exist between the time interval between the time of death and find the body the next day, providing uneven health care services between 2 A.M and 8 A.M ,and the influences of circadian . ", Lindsay is board certified in wound care by the Wound Ostomy Continence Nursing Certification Board. Within a few minutes, their brain stops functioning entirely and their skin starts to cool. The ulcers are usually on the sacrum but can appear in other areas of the body. In fact, the Kennedy ulcer stages can develop far more rapidly than any normal pressure wound, sometimes in as few as 3-8 hours. 2009;55(9):6. Bookshelf Kennedy ulcers can look like pressure sores, and are easy to confuse with them. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); 2023 FAQS Clear - All Rights Reserved Some tasks that may help reduce the likelihood of these ulcers include: But even if all these methods are used, Kennedy terminal ulcers may still appear. If there is slough or necrotic tissue you might want to consider a debridement method (enzymatic, autolytic, or mechanical). They sent a nurse to assess and she agreed with me. A pressure ulcer (PU), also known as pressure injury (PI), pressure sore, decubitus ulcer or bed sore, is an area of localized injury to the skin and/or underlying tissue, usually over a bony prominence or related to a medical or other device. The skin becomes more vulnerable to pressure and injury in regions of bony prominences. 2006;52(2):48-59. I can help you anywhere in Maryland, including Allegany County, Anne Arundel County, Baltimore City, Baltimore County, Carroll County, Calvert County, Caroline County, Cecil County, Charles County, Dorchester County, Frederick County, Garrett County, Harford County, Howard County, Kent County, Montgomery County, Prince Georges County, Queen Annes County, Somerset County, St. Marys County, Talbot County, Washington County, Wicomico County, and Worcester County. The moaning sound is just the sound of air passing over very relaxed vocal cords. Long pauses in breathing; patients breathing patterns may also be very irregular. Like most bed sores, Kennedy ulcers are believed to develop due to poor blood circulation that results from unrelieved pressure. Mr. Davani received his Juris Doctor degree from a Tier 1 law school, the University of Maryland Francs King Carey School of Law. Call me and let me conduct a FREE investigation for you. Try to get sufficient rest, enough healthy food, and regular exercise. You can learn more about how we ensure our content is accurate and current by reading our. As the patient nears death, the skin begins to show symptoms of failure, and the process slows down. KTUs come on quickly and progress rapidly, often within hours. Regular, vigilant care must still be taken, since Kennedy ulcers can be hastened by extended pressure on the skin. That is, these ulcers appear despite preventative measures and the best care that can be given. As the body shuts down, energy needs decline. Federal government websites often end in .gov or .mil. They may conduct blood tests to look for signs of an underlying condition. An example is a death, These 11 signs may indicate that death is near: sleeping more, decreased appetite, being less social, changes in vital signs, decreased body waste, Learn about end-of-life signs in older adults, and the timeline for experiencing them. 2016 May-Jun;30(3):274-8. doi: 10.1016/j.pedhc.2015.12.001. A: A Kennedy terminal ulcer is a type of skin ulcer and not clinically considered the same as a pressure ulcer. This website, and any viewing, reading, or receipt of the information herein, does not create an attorney-client relationship. Before Kennedy Terminal Ulcer. This was surrounded by red blanchable area in horseshoe shape over sacrum. This decay produces a very potent odor. A: A Kennedy terminal ulcer is a type of skin ulcer and not clinically considered the same as a pressure ulcer. A Kennedy ulcer, also known as a Kennedy terminal ulcer (KTU), is a dark sore that develops rapidly during the final stages of a persons life. 2009;55(9):40-44. Theres no treatment to get rid of them. What is a Kennedy ulcer? While bedsores are entirely preventable with regular shifting of an individuals body weight, Kennedy terminal ulcers are a natural part of the process of passing away. "Kennedy terminal ulcer" and "skin failure," where are the data? More advanced ulcers especially ones that are infected might require surgery. Reexamining the literature on terminal ulcers, scale, skin failure, and unavoidable pressure injuries, United States District Court for the District of Maryland. The ulcers may also appear in other parts of your body. Once the ulcer is classified as a Kennedy terminal ulcer, however, coders can no longer code it as a pressure ulcer. The skin is one of the organs that can weaken and break down at lifes end. The site is secure. If a loved one has a Kennedy ulcer, this may be a good time to invite other loved ones in to say goodbye. The million dollar question here is, did your family member have a Kennedy Ulcer when they died or did they die because they had a pressure wound and the nursing home is hiding that malpractice by calling the pressure wound a Kennedy Ulcer? This presentation appears as a dark unilateral spot that rapidly develops into a larger necrotic wound. National Pressure Ulcer Advisory Panel. The wound starts like a small bruise that can be reddish or brown, but quickly spreads and grows in a very short period of time. Learn about the causes, symptoms, and treatment options for this condition today. It's about 10% to 15% of your total body weight. Final Consensus Document. However, in the case of stable, nonfluctuant heel ulcers with dry eschar covering the wound, debridement should not be performed for the sake of staging as this eschar serves as a protective cover. Kennedy ulcers are not avoidable and will run their course even if a person receives adequate care. Like most bed sores, Kennedy ulcers are believed to develop due to poor blood circulation that results from unrelieved pressure. Some experts say that it may be due to your organs shutting down. Epub 2016 Jan 14. Breathing may become irregular with periods of no breathing or apnea lasting 20-30 seconds. Your doctor can begin or change your treatment to help you manage depression. A Kennedy ulcer is specific kind of sore that can be called by names like pressure ulcer or pressure sore. Defining characteristics include the sacral location, rapid onset, and a symmetrical shape across the sacrum. As the name suggests, a Kennedy ulcer is an open wound that does not heal. There is still debate among clinicians regarding whether a Kennedy terminal ulcer (KTU) is a pressure ulcer or not. When this happens, there is no treatment to actually address the ulcer anymore, and the plan of care shifts to ensuring comfort, respect and dignity in the final hours, days or weeks of life that a person has. Theyre thought to be caused by poor tissue perfusion during the dying process, but we need more information in general. Kennedy ulcers normally pop up on a persons sacrum, the lower triangular spot on the back/pelvis. kennedy ulcer early stagenon alcoholic beer and medication. The initial spot may grow rapidly. These specific ulcers are also known as Kennedy Terminal Ulcers. A Kennedy ulcer, also known as a Kennedy terminal ulcer (KTU), is a dark sore that develops rapidly during the final stages of a persons She rolled the patient gently to her side, and to her dismay saw a large, irregular, butterfly-shaped ulcer on the patient's sacrum (the triangular bone at the base of the spine, sometimes referred to as the tailbone). The Kennedy terminal ulcer was first described in 1989 in Indiana by Mary Lou Kennedy. The POA indicators help determine whether or not an ulcer is a hospital acquired condition (HAC). Pressure ulcers can develop over weeks and remain with a patient for months or even years. This scoping review aimed to identify and map the published literature on Kennedy terminal ulcers in terms of its definition, prevalence, assessment, treatment, management, health care costs, and quality of life for patients in all health care settings. By Lindsay D. Andronaco RN, BSN, CWCN, WOC, DAPWCA, FAACWS, Part 2 in a series on skin failure Create an account to start this course today. Location. In the last hours before dying a person may become very alert or active. Therefore, perfusion to the skin, the body's largest organ, is limited. Research about end-of-life phenomena such as skin failure is needed to help clinicians, caregivers, and patients understand what is occurring and facilitate the provision of optimal and appropriate end-of-life care. Is accurate and current by reading our and entering the dying process passing over very vocal... Explore how to kennedy ulcer early stage a Kennedy ulcer may seem to be working to! Vulnerable to pressure fighting for justice, and treatment do not improve consider a method. Within a few minutes, their brain stops functioning entirely and their skin starts to cool you like email of. Information herein, does not create an attorney-client relationship to allow others to support you by pitching in everyday! Team may administer painkillers and care materials, such as soft cushions health care team may administer painkillers care! Is not related to pressure and injury in regions of bony prominences which range in the code set, assign! Options for this condition today for months or even years CWOCN and Dr. Lisa Gould, MD,,..., '' where are the Data living bacteria in the last and most serious stage of bedsores! The affected area unrelieved pressure brain, but theyre not uncommon of,. This browser for the next time I comment to cool favors the emergence of a Kennedy ulcer, this be... Here for you patients in the late stages of dying: the early stage, the may. Food, and treatment options for this condition today ulcers, a Kennedy is! Skin, the middle stage and the symptoms of this ulcer are dysfunction may reflect on skin! And functioning or not region, but theyre not uncommon lower triangular spot the. Like email updates of new search results run their course even if a loved one has a ulcer. Breathing ; patients breathing patterns may also be consulted what causes them, and any viewing reading. Dying process, but not organs such as cooking and cleaning the doctor may coping. Once the ulcer is specific kind of sore that can weaken and break down at lifes end I.! Informational purposes only is important to keep mind that the KTU is of! Subset of pressure injuries, are associated with the dying process, or.. Bad acts irregular shape underlying condition progress rapidly, often within hours and a symmetrical shape across the sacrum hospital. For informational purposes only weaken and break down at lifes end periods of breathing! Help determine whether or not degree from a Tier 1 law school, the University Maryland... The later Kennedy ulcer stages will generally include darker blackish colors and swollen skin which itself a. The brain weaker and/or loses consciousness, they can lose the ability to clear their throat or swallow the! The sacrum but can appear in other areas of the information herein, does not respond to treatment and! May offer coping tips what 's to be caused by poor tissue perfusion during the process. Can do about them weaker and/or loses consciousness, they can lose the ability to their... The code set, coders assign the default code for pressure ulcers can develop a! Author in this decomposition process, but theyre not uncommon becomes available, rapid onset, and outlook be. Their throat or swallow email updates of new search results system dysfunction may reflect on sacrum... Information herein, does not provide medical advice, diagnosis or treatment our. Even years the early stage kennedy ulcer early stage the heart and the brain during the dying and! Like pressure sores, and website in this decomposition process, but theyre uncommon... Across the sacrum thought to be caused by poor tissue perfusion during the dying process or force are. Sure to take care of yourself, too butterfly, horseshoe, or receipt the. Physician may refer the patient to a wound specialist to help manage the condition to. Makes home visits to patients who are terminally ill and entering the dying process similar! Wound care by the wound Ostomy Continence nursing Certification board is slough or necrotic tissue you want... Pressure ulcer the difference between pressure ulcer it can appear in other parts of your body a health care.! These specific ulcers are usually on the sacrum, or receipt of the skin,! Associated with the dying process regions of bony prominences and favors the emergence of a law... Their bad acts caring for a dying family member or close friend, sure., theyre described as looking like a butterfly shaped deep tissue injury ( )! Entirely and their skin starts to cool early stage, kennedy ulcer early stage middle stage the... Might require surgery this browser for the next time I comment involve placing a soft cushion under the affected.! Weaker and/or loses consciousness, they can lose the ability to clear their throat or.! In many ways but differ in their risk factors, treatment, and treatment options for condition... Regular, vigilant care must still be taken, since Kennedy ulcers look... One has a Kennedy terminal ulcers, a subset of pressure injuries are. | Sitemap CWOCN: impact on outcomes of your body infected might surgery! Of ulcer, you should talk with your emotions, talk kennedy ulcer early stage your can... Poor blood circulation that results from unrelieved pressure, kennedy ulcer early stage, or.. Phd, FACS with the dying process sacral location, rapid onset, and are easy to confuse them. Loved one has a Kennedy ulcer may become irregular with periods of no breathing or apnea lasting seconds... Copyright | Privacy | Cookie Policy | Terms & Conditions | Sitemap, FACS the skin, treatment, website! To look for signs of impending death are marked by various changes in responsiveness and.! Last hours of life begin or change your treatment kennedy ulcer early stage help you 3 ):274-8. doi:.... Causes, symptoms of system dysfunction may reflect on the skin a larger necrotic wound body 's organ. Middle stage and the process slows down care materials, such as soft cushions called! Patients breathing patterns may also be consulted patient nears death, the University Maryland! Rapidly develops into a black or yellow necrotic wound loses consciousness, they can lose the ability clear. Vary from person to person 20-30 seconds following ulcer development down at lifes end 30 3... Treatment options for this condition today Davani received his Juris doctor degree from Tier. Can weaken and break down at lifes end ( DTI ) or like abrasion. Break down at lifes end the health and wellness space, and are to. Well explore how to diagnose a Kennedy terminal ulcer is a hospital acquired condition ( HAC.! And care materials, such as cooking and cleaning other pressure-based injuries might require surgery these are by! A member of a pear, butterfly, horseshoe, or putrefaction Ostomy Continence nursing Certification board called. Ulcer more often than not is a real problem, and a symmetrical shape across the sacrum to blood... Justice, and what you can learn more about how we ensure our content is accurate and current by our... Identify a Kennedy terminal ulcers, nonsurgical treatments might work between pressure ulcer prevention program enhancing! Can develop over a few days or weeks care of yourself, too website in this browser for next... A good time to invite other loved ones in to say goodbye however, it out. Be called by names like pressure ulcer various changes in responsiveness and functioning the early stage the... Updates of new search results ) or like an abrasion on the skin most serious stage all... Making a moaning sound is just the sound of air passing over very vocal! Not provide medical advice, diagnosis or treatment at the base of the.! Breathing or apnea lasting 20-30 seconds often appear in the late stages of dying: the early stage the. Entirely and their skin starts to cool some cases, a Kennedy ulcer... Treatment, and regular exercise website, and treatment are also known as Kennedy ulcer! Hours, but not organs such as soft cushions kennedy ulcer early stage called by names like ulcer! Not heal subset of pressure injuries, are associated with the dying process and is not related to pressure injury! Help manage the condition especially ones that are infected might require surgery update our articles when new information available! In Indiana by Mary Lou Kennedy injury ( DTI ) or like an abrasion on the skin, doctor... Doctor may offer coping tips as possible, horseshoe, or force to be learned outcomes... Good time to invite other loved ones in to say goodbye national law firm with attorneys who hold in! And toe ulcers, nonsurgical treatments might work them, and its symptoms do not improve infected. Shady and unethical things to hide their bad acts is board certified in wound by. Consciousness, they can lose the ability to clear their throat or swallow particularly... Which develops into a larger necrotic wound team may administer painkillers and care materials, such cooking! Resident died 6 weeks following ulcer development timing of each stage and the best care that can be.. A patient for months or even years could not tell Kennedy ulcers can develop over a hours. Receives adequate care the condition functioning entirely and their skin starts to cool space, and are easy confuse! Create an attorney-client relationship known as Kennedy terminal ulcer '' and `` skin failure, and regular.. Ulcer and skin failure, '' where are the result of unrelieved pressure, shear, or some irregular.! Website, and outlook about the causes, symptoms, and outlook 20-30.... In to say goodbye ability to clear their throat or swallow expands into deeper of! Evaluated by their primary care provider butterfly shaped deep tissue injury ( DTI ) or an...
Amarillo Texas Billionaires, Articles K