¼±Åà - È­»ìǥŰ/¿£ÅÍŰ ´Ý±â - ESC

 
"Journal of clinical anesthesia."¿¡ ´ëÇÑ °Ë»ö °á°úÀÔ´Ï´Ù. °Ë»ö °á°ú º¸´Â µµÁß¿¡ Tab ۸¦ ´©¸£½Ã¸é °Ë»ö âÀÌ ¼±Åõ˴ϴÙ.
´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 15 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
  • monitored anesthesia care
    °¨½Ã¸¶Ãë°ü¸®
  • one lung anesthesia
    ÇÑÂÊÆó¸¶Ãë, ÇÑÂÊÇãÆÄ¸¶Ãë
  • open anesthesia
    °³¹æ¸¶Ãë
  • obstetric anesthesia
    »ê°ú¸¶Ãë
  • outpatient anesthesia
    ¿Ü·¡¸¶Ãë
  • plexus anesthesia
    ½Å°æ¾ó±â¸¶Ãë, ½Å°æÃѸ¶Ãë
  • para-anesthesia
    ÇϹݽۨ°¢¸¶ºñ
  • pudendal anesthesia
    À½ºÎ¸¶Ãë
  • paravertebral anesthesia
    ôÃß¿·¸¶Ãë
  • pediatric anesthesia
    ¼Ò¾Æ¸¶Ãë
  • peridural anesthesia
    °æ¸·¿Ü¸¶Ãë
  • rectal anesthesia
    Á÷À帶Ãë, °ðâÀÚ¸¶Ãë
  • refrigeration anesthesia
    ³Ãµ¿¸¶Ãë
  • regional anesthesia
    ºÎÀ§¸¶Ãë
  • retrobulbar anesthesia
    ´«µÚ¸¶Ãë
¿¾ ´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 15 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
  • outpatient anesthesia
    ¿Ü·¡¸¶Ãë
  • paravertebral anesthesia
    ôÃßÁÖÀ§¸¶Ãë
  • pediatric anesthesia
    ¼Ò¾Æ¸¶Ãë
  • peribulbar anesthesia
    ´«µÑ·¹¸¶Ãë
  • peridural anesthesia
    (¢¡epidural anesthesia) °æ¸·¿Ü¸¶Ãë
  • plexus anesthesia
    ½Å°æ¾ó±â¸¶Ãë
  • pudendal anesthesia
    ¿ÜÀ½¸¶Ãë
  • rectal anesthesia
    °ðâÀÚ¸¶Ãë, Á÷À帶Ãë
  • refrigeration anesthesia
    (¢¡cryoanesthesia) ³Ãµ¿¸¶Ãë(¹ý)
  • regional anesthesia
    ºÎÀ§¸¶Ãë
  • retrobulbar anesthesia
    ´«µÚ¸¶Ãë
  • sacral anesthesia
    ¾ûÄ¡¸¶Ãë, õ°ñ¸¶Ãë
  • segmental anesthesia
    ºÐÀý¸¶ºñ
  • self-controlled anesthesia
    ÀÚ°¡Á¶Àý¸¶Ãë
  • spinal anesthesia
    ô¼ö¸¶Ãë
¿¾ ´ëÇÑÀÇÇù 3 ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 15 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
  • caudal anesthesia (block)
    ¹ÌÃ߸¶Ãë(Ú­õÐ ö­)(Â÷´Ü).
  • closed circuit anesthesia
    Æó¼â(½Ä)¼øÈ¯¸¶Ãë(øÍáðãÒâàü»Ø«ö­).
  • cold anesthesia
    ÇÑ·©¸¶Ãë(¡­Ø«ö­).
  • combined anesthesia
    º´¿ë¸¶Ãë(¡­Ø«ö­).
  • comprehensive anesthesia
    ±³À°¿ë¸ðÇü¸¶Ãë
  • conduction anesthesia
    Àü´Þ¸¶Ãë(¡­Ø«ö­).
  • continuous epidural anesthesia
    Áö¼Ó¼º °æ¸·¿Ü¸¶Ãë(¹ý)(¡­ÌãØ¯èâØ«ö­Ûö).
  • continuous spinal anesthesia
    Áö¼Ó(¼º) ôÃ߸¶Ãë(¹ý)(¡­ô±õÐØ«ö­Ûö).
  • corneal anesthesia
    °¢¸·¸¶Ãë
  • crossed anesthesia
    ±³Â÷¼º ¹«°¨°¢(Áõ)(¡­ÙíÊïÊÆñø).
  • dental anesthesia
    Ä¡°ú¸¶Ãë(¡­Ø«ö­).
  • differential anesthesia
    °¨º°¸¶Ãë(¹ý), ºÐ¸®¸¶Ãë(¹ý)(ÝÂìÆØ«ö­Ûö).
  • differential spinal anesthesia
    °¨º°Ã´Ã߸¶Ãë(¹ý), ºÐ¸®Ã´Ã߸¶Ãë, ±¸ºÐôÃß ¸¶Ãë.
  • dissociated anesthesia
    ÇØ¸®¼º ¸¶Ãë(ú°ìÆàõØ«ö­), ÇØ¸®¼º Áö°¢¸¶ºñ.
  • endobronchial anesthesia
    ±â°üÁö³» ¸¶Ãë(¹ý)(Ѩηò¨Ò®Ø«ö­Ûö).
KMLE ÀÇÇоà¾î »çÀü À¯»ç °Ë»ö °á°ú : 5 ÆäÀÌÁö: 5
anes, anesth anesthesia, anesthetic
ASAAD American Society for the Advancement of Anesthesia in Dentistry
ASB American Society of Bacteriologists; anencephaly-spina bifida [syndrome]; anesthesia standby; Anxiet...
CLA cerebellar ataxia; Certified Laboratory Assistant; cervicolinguoaxial; contralateral local anesthesi...
CLE centrilobular emphysema; continuous lumbar epidural [anesthesia]
KMLE ÀÚµ¿ÃßÃâ ÀÇÇоà¾î »çÀü À¯»ç °Ë»ö °á°ú : 5 ÆäÀÌÁö: 5
CGI-I Clinical Global Impression-Improvement
CIS Clinical Information System
CIS Clinical Interview Schedule
CLIA Clinical Laboratory Improvement Amendment
CLIA Clinical Laboratory Improvement Amendments of 1988
°æºÏ´ë Ä¡°ú´ëÇÐ ±¸°­³»°ú ±³½Ç »çÀü À¯»ç °Ë»ö °á°ú : 15 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
    ¼³¸í
  • refrigeration anesthesia
    ³Ãµ¿ ¸¶Ãë, ³Ãµ¿ ¸¶Ãë¹ý, ³Ã°¢ ¸¶Ãë
  • regional anesthesia
    ±¹ºÎ ¸¶Ãë, ±¹ÇÑ ¸¶Ãë, ±¹¼Ò¸¶Ãë, ºÎºÐ ¸¶Ãë
    ±¹¼Ò ¸¶Ãë·Î ½Å°æ ÀÓÆÞ½º¸¦ ½Åü Á߽ɿ¡ °¡±î¿î ºÎÀ§¿¡¼­ Â÷´ÜÇÔÀ¸·Î½á ½ÅüÀÇ ÀϺκÐÀ» ¸¶ÃëÇÏ´Â °Í.
  • sacral anesthesia
    »õµé ¸¶Ãë, õ°ñ ¸¶Ãë, õ°ñ ¸¶Ãë¹ý
    ô¼ö ¸¶ÃëÀÇ ÀÏÁ¾. ¸¶ÃëÀÇ ¹üÀ§°¡ Ç×¹®À» Áß½ÉÀ¸·Î ÇØ¼­ ¾ç µÐºÎ¿¡¸¸ ±¹ÇѵȴÙ. ¸¶Ãë ¹üÀ§´Â S3, S4, S5 ¸¸À¸·Î ÃæºÐÇϹǷÎ, ½Ç½ÃÇÒ ¶§´Â ȯÀÚ¸¦ ¾ÉÀº ÀÚ¼¼·Î ÇÏ°í °íºñÁß¾×À» 1§¢ Á¤µµ ÁöÁÖ¸· Çϰ­¿¡ ÁÖÀÔ½ÃÄÑ ¼öºÐ °£ ±× üÀ§¸¦ ÃëÇÏ°Ô ÇÑ´Ù.
  • saddle anesthesia
    »õµé ¸¶Ãë, »õµé ¸¶Ãë¹ý
    ô¼ö ¸¶ÃëÀÇ ÀÏÁ¾.
  • segmental anesthesia
    ºÐÀý¼º ¸¶ºñ
    °æ¸·ÀÇ ¸¶Ãë ½Ã, Èñ¸ÁÇϴ ô¼ö ºÐÀý¸¸À» ¸¶ÃëÇÏ´Â ¹æ¹ý.
  • spinal cord anesthesia
    ô¼ö ¸¶Ãë
  • spraying anesthesia
    ºÐ¹« ¸¶Ãë
  • stage of surgical anesthesia
    ¼ö¼ú±â, ¼ö¼ú ¸¶Ãë±â
  • surface anesthesia
    Ç¥¸é ¸¶Ãë, Ç¥¸é ¸¶Ãë¹ý
  • swabbing anesthesia
    µµÆ÷ ¸¶Ãë
  • topical anesthesia
    ±¹¼Ò ¸¶Ãë, Ç¥¸é ¸¶Ãë, µµÆ÷ ¸¶Ãë
  • topo-anesthesia
    ±¹¼Ò Ã˰¢ ¼Ò½Ç
    ±¹¼ÒÀÇ Ã˰¢ÀÌ ¼Ò½ÇµÇ´Â °Í.
  • total spinal anesthesia
    Àü ôÃß ¸¶Ãë
  • translaryngeal anesthesia
    °æÈĵΠ¸¶Ãë
  • transtracheal anesthesia
    °æ±â°ü ¸¶Ãë, °æ±â°ü ¸¶Ãë¹ý
CancerWEB ¿µ¿µ ÀÇÇлçÀü À¯»ç °Ë»ö °á°ú : 9 ÆäÀÌÁö: 5
controlled clinical trials Clinical trials involving one or more test treatments, at least one control treatment, specified outcome measures for evaluating the studied intervention, and a bias-free method for assigning patients to the test treatment. The treatment may be drugs, devices, or procedures studied for diagnostic, therapeutic, or prophylactic effectiveness. Control measures include placebos, active medicines, no-treatment, dosage forms and regimens, historical comparisons, etc. When randomization using mathematical techniques, such as the use of a random numbers table, is employed to assign patients to test or control treatments, the trials are characterised as randomised controlled trials. However, trials employing treatment allocation methods such as coin flips, odd-even numbers, patient social security numbers, days of the week, medical record numbers, or other such pseudo- or quasi-random processes, are simply designated as controlled clinical trials.
(12 Dec 1998)
cytogenetics, clinical The application of cytogenetics to clinical medicine. For example, clinical cytogenetic studies might be done to determine whether a child with possible Down syndrome has an extra chromosome 21.
(12 Dec 1998)
prospective, randomised, double-blind clinical trial <statistics> A clinical trial in which the method for analysing data has been specified in the protocol before the study has begun (prospective), the patients have been randomly assigned to receive either the study drug or alternative treatment, and in which neither the patient nor the physician conducting the study know which treatment is being given to the patient.
(13 Nov 1997)
psychology, clinical The branch of psychology concerned with psychological methods of recognizing and treating behaviour disorders.
(12 Dec 1998)
human clinical trial <pharmacology> Controlled clinical studies in human volunteers to test the safety and efficacy of pharmaceutical candidates.
There are usually three distinct phases of human clinical testing: Phases I, II, and III.
Phase I trials are safety studies of volunteers, usually healthy controls. Phase II trials are studies to confirm safety and study optimum dose and initial efficacy. Phase III trials are studies to prove safety and efficacy in a specific patient population.
(14 Nov 1997)
decision support systems, clinical Computer-based information systems used to integrate clinical and patient information and provide support for decision-making in patient care.
(12 Dec 1998)
disease, clinical A disease with clinical signs and symptoms that can be recognised. As distinct from a subclinical illness without recognizable clinical manifestations. Diabetes, for example, can be subclinical in a person before emerging as a clinical disease.
(12 Dec 1998)
in clinical parlance The term often refers to the posterior funiculus of the spinal cord.
(05 Mar 2000)
epidemiology, clinical Epidemiology focused specifically upon patients.
(12 Dec 1998)
ÀÌ ¾Æ·¡ ºÎÅÍ´Â °á°ú°¡ ¾ø½À´Ï´Ù.
KMLE ¾àǰ/ÀǾàǰ ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • Á¦Ç°¸í
    ¼ººÐ/ÇÔ·®
    ±¸ºÐ/º¸Çè±Þ¿©
KMLE ¾àǰ/ÀǾàǰ À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • Á¦Ç°¸í
    ¼ººÐ/ÇÔ·®
    ±¸ºÐ/º¸Çè±Þ¿©
¾Ë±â½¬¿î ÀÇÇпë¾îÇ®ÀÌÁý, ¼­¿ïÀÇ´ë ±³¼ö ÁöÁ¦±Ù, °í·ÁÀÇÇÐ ÃâÆÇ ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
¾Ë±â½¬¿î ÀÇÇпë¾îÇ®ÀÌÁý, ¼­¿ïÀÇ´ë ±³¼ö ÁöÁ¦±Ù, °í·ÁÀÇÇÐ ÃâÆÇ À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÀÇÇù Çʼö ÀÇÇпë¾îÁý »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÀÇÇù Çʼö ÀÇÇпë¾îÁý »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù 2 ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù 2 ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù 3 ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÇØºÎÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÇØºÎÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
´ëÇѽŰæ¿Ü°úÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
    ÇÑÀÚ
´ëÇѽŰæ¿Ü°úÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
    ÇÑÀÚ
´ëÇѱâ»ýÃæÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
´ëÇѱâ»ýÃæÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
´ëÇÑ»ýÈ­ÇкÐÀÚ»ý¹°ÇÐȸ ¿ë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
´ëÇÑ»ýÈ­ÇкÐÀÚ»ý¹°ÇÐȸ ¿ë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
KI ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
KI ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
KMLE ÀÇÇоà¾î »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
KMLE ÀÚµ¿ÃßÃâ ÀÇÇоà¾î »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
ÀÇÇÐ³í¹® ¾àÀÚ(Pubmed/Entrez) °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
Çѱ¹Ç¥ÁØÁúº´»çÀκзù ¾àÀÚ ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ÄÚµå
    ¿µ¹®
    ÇѱÛ
Çѱ¹Ç¥ÁØÁúº´»çÀκзù ¾àÀÚ À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ÄÚµå
    ¿µ¹®
    ÇѱÛ
°æºÏ´ë Ä¡°ú´ëÇÐ ±¸°­³»°ú ±³½Ç »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
    ¼³¸í
CancerWEB ¿µ¿µ ÀÇÇлçÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
MeSH(Medical Subject Headings) ¸ÂÃã °Ë»ö (http://www.nlm.nih.gov) °á°ú : 0 ÆäÀÌÁö: 5
MeSH(Medical Subject Headings) À¯»ç °Ë»ö (http://www.nlm.nih.gov) °á°ú : 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - Merriam-Webster's ÀÇÇлçÀü ¸ÂÃã °Ë»ö (https://www.merriam-webster.com) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - Merriam-Webster's ÀÇÇлçÀü À¯»ç °Ë»ö (https://www.merriam-webster.com) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - A.D.A.M. Medical Encyclopedia ¸ÂÃã °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - A.D.A.M. Medical Encyclopedia À¯»ç °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - MedlinePlus Health Topics ¸ÂÃã °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - MedlinePlus Health Topics À¯»ç °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - µå·¯±×ÀÎÆ÷ ¾àÇÐ Á¤º¸ ¸ÂÃã °Ë»ö (http://www.druginfo.co.kr) °á°ú: 0 ÆäÀÌÁö: 5
Á¦Ç°¸í
ÆÇ¸Å»ç
º¸ÇèÄÚµå ¼ººÐ/ÇÔ·®
±¸ºÐ/º¸Çè±Þ¿©
¿ÜºÎ ¸µÅ© - µå·¯±×ÀÎÆ÷ ¾àÇÐ Á¤º¸ À¯»ç °Ë»ö (http://www.druginfo.co.kr) °á°ú: 0 ÆäÀÌÁö: 5
Á¦Ç°¸í
ÆÇ¸Å»ç
º¸ÇèÄÚµå ¼ººÐ/ÇÔ·®
±¸ºÐ/º¸Çè±Þ¿©
¿ÜºÎ ¸µÅ© - WebMD.com Drug Reference ¸ÂÃã °Ë»ö (http://www.webmd.com) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - WebMD.com Drug Reference À¯»ç °Ë»ö (http://www.webmd.com) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - Drug.com Drugs by Medical Condition ¸ÂÃã °Ë»ö (http://www.drugs.com) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - Drug.com Drugs by Medical Condition À¯»ç °Ë»ö (http://www.drugs.com) °á°ú: 0 ÆäÀÌÁö: 5
KMLE À¥ ¿ë¾î ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
KMLE À¥ ¿ë¾î À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
ÇÑ¿µ/¿µÇÑ »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
ÇÑ¿µ/¿µÇÑ »çÀü À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
  • ¿µ¹®
    ÇѱÛ
WordNet ÀÏ¹Ý ¿µ¿µ »çÀü °Ë»ö °á°ú : 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - American Heritage Dictionary ¿µ¿µ»çÀü ¸ÂÃã °Ë»ö (https://www.ahdictionary.com) °á°ú: 0 ÆäÀÌÁö: 5
¿ÜºÎ ¸µÅ© - American Heritage Dictionary ¿µ¿µ»çÀü À¯»ç °Ë»ö (https://www.ahdictionary.com) °á°ú: 0 ÆäÀÌÁö: 5
ÅëÇÕ°Ë»ö ¿Ï·á