Dealing with hyperglycaemia
High blood sugar
Revisado por pares por Dr Hayley Willacy, FRCGP Última actualización por St John AmbulanceÚltima actualización 20 Nov 2016
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En esta serie:Diabetes tipo 1Insulina
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This leaflet is created from first aid advice provided by St John Ambulance, the nation's leading first aid charity. This advice is no substitute for first aid training - encuentra un curso de formación cerca de ti.
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Hyperglycaemia means high blood sugar, caused by too little insulin.
Symptoms include warm, dry skin, thirst, drowsiness, and fruity-smelling breath.
Untreated, it can lead to unresponsiveness, needing emergency treatment.
Call 999 or 112 immediately if you suspect hyperglycaemia.
If unsure if blood sugar is high or low, give something sugary.
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En este artículo:
Too little resistencia a la insulina can cause high blood sugar (hyperglycaemia).
If it's not treated and gets worse, the person can gradually become unresponsive (going into a diabetic coma). So it's important to get them to see a doctor in case they need emergency treatment.
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Warm, dry skin.
Rapid pulse and breathing.
Fruity sweet breath.
Really thirsty.
Drowsiness, leading to unresponsiveness if not treated.
Lo que necesitas hacer
Volver al contenidoCall 999 or 112 straightaway for medical help and say that you suspect hyperglycaemia.
While you wait for help to arrive, keep checking their breathing, pulse and level of response.
If they lose responsiveness at any point, open their airway, check their breathing and prepare to treat someone who's become unresponsive.
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If you're unsure whether their blood sugar is high or low
Volver al contenidoIf you're not sure whether someone has high or low blood sugar, give them something sugary anyway, as this will quickly relieve low blood sugar and is unlikely to do harm in cases of high blood sugar.
If they don't improve quickly, call 999 or 112 for medical help.
If they lose responsiveness at any point, open their airway, check their breathing and prepare to treat someone who's become unresponsive.
Nota: these hints are no substitute for thorough knowledge of first aid. St John Ambulance holds cursos de primeros auxilios throughout the country.
Adapted from the St John Ambulance leaflet: diabetic emergency. Los derechos de autor de este folleto pertenecen a St John Ambulance.
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Preguntas frecuentes
What specifically causes the fruity sweet smell on someone's breath when they have high blood sugar?
The fruity sweet smell on a person's breath is a symptom of hyperglycaemia, which occurs when there is too little insulin in the body. While the article doesn't detail the exact biological process, it indicates it's a key sign to look for in suspected high blood sugar.
Why is it important to seek medical help quickly for high blood sugar?
It's important to seek medical help straightaway for high blood sugar because if it's left untreated and worsens, the person can gradually become unresponsive, which is known as going into a diabetic coma. Emergency treatment may be required to prevent this serious outcome.
What should I do if the person becomes unresponsive while I'm waiting for medical help?
If the person becomes unresponsive at any point while you are waiting for medical help to arrive, you should open their airway, check their breathing, and prepare to treat someone who has become unresponsive. You should also continue to monitor their breathing, pulse, and level of response.
Is there any harm in giving someone sugary food or drink if I'm not sure if their blood sugar is high or low?
If you are unsure whether someone's blood sugar is high or low, giving them something sugary is unlikely to cause harm in cases of high blood sugar. It will, however, quickly relieve low blood sugar, so it's a safe initial action if you're uncertain.
What does 'opening their airway' involve if someone becomes unresponsive?
The article advises to 'open their airway' if someone becomes unresponsive. While it doesn't provide specific instructions on how to perform this, it's a critical step in first aid for an unresponsive person, usually learned in a first aid course.
How can I tell if someone's breathing or pulse is rapid?
The article lists 'rapid pulse and breathing' as signs of high blood sugar. While it doesn't give specific rates or methods to check, a rapid pace would be noticeably faster than normal breathing and heart rate for that individual.
Can a person with high blood sugar suddenly feel better on their own without medical intervention?
The article indicates that high blood sugar (hyperglycaemia) needs to be treated, and if it worsens, the person can become unresponsive. This suggests that without medical intervention, the condition is unlikely to resolve on its own and can become more severe.
Sobre el autor

St John Ambulance
Acerca del revisorVer biografía completa

Dr Hayley Willacy, FRCGP
Médico General, Autor Médico
MBChB (1992), DRCOG, DFFP, MRCOG (Part 1) MRCGP (2007), DFSRH (2013), MSc - medical education (2020)
La Dra. Hayley Willacy fue una médica general del NHS que trabajaba en el noroeste de Inglaterra, quien se retiró de la práctica clínica en 2022 después de 30 años.
Historial del artículo
La información en esta página está escrita y revisada por pares por clínicos calificados.
20 Nov 2016 | Última versión
6 Aug 2013 | Publicado originalmente
Escrito por:
St John Ambulance

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