Sep 26, 2026·1 min read·Graded Spanish · word-by-word audio
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En 1797, al famoso almirante británico Horatio Nelson le amputaron el brazo derecho. Según la leyenda, el único anestésico que le dieron fue un trago de ron. Durante gran parte de la historia, incluso las amputaciones se hacían con los pacientes completamente despiertos. La anestesia general cambió todo esto para siempre.
Hoy se practican más de 350 millones de intervenciones quirúrgicas cada año bajo anestesia general. Sin embargo, todavía no está del todo claro cómo estos misteriosos fármacos nos hacen perder la consciencia. Los expertos tratan de conocer qué áreas del cerebro actúan en este proceso.
El estudio de la anestesia sigue siendo uno de los grandes misterios de la ciencia. Pero su investigación está revelando pistas sobre la naturaleza de la consciencia. Comprender cómo funciona la anestesia puede arrojar luz sobre cómo opera nuestro cerebro.
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Watch out, English speaker
Spanish distinguishes between the preterite (pretérito indefinido) for completed actions and the imperfect (pretérito imperfecto) for ongoing or habitual past actions. English often uses the simple past for both, so you might mistakenly say 'se hacían' as 'they did' instead of 'they used to do' or 'were done.' Pay attention to context: 'amputaron' is a one-time event, while 'se hacían' describes a repeated practice.
Spanish often uses 'se' + third-person verb for passive meaning without specifying the agent, as in 'se practican' (are performed) or 'se introdujo' (was introduced). English typically uses a passive construction with 'by' or an active subject, so you might incorrectly add an agent or change the structure. Remember that 'se' here is not reflexive; it's a passive marker common in news and academic writing.
Key vocabulary
anestesiaf.
anesthesia
“La anestesia general se introdujo en 1846.”— General anesthesia was introduced in 1846.
Pattern anestesia general general anesthesia
Plural: anestesias
💡 From Greek an- (without) + aisthesis (sensation), meaning "without sensation"
amputarv.
to amputate
“Al almirante Nelson le amputaron el brazo derecho.”— Admiral Nelson had his right arm amputated.
💡 des- means "remove," conectar means "connect," together meaning "disconnect"
intervenciónf.
intervention, surgery
“Se practican más de 350 millones de intervenciones quirúrgicas cada año.”— More than 350 million surgical interventions are performed each year.
Pattern intervención quirúrgica surgery
Compare operación (surgery)
Plural: intervenciones
💡 From Latin intervenire, meaning "to intervene, interfere"
almirantem.
admiral
“El almirante Nelson perdió su brazo derecho.”— Admiral Nelson lost his right arm.
Pattern almirante británico British admiral
Plural: almirantes
💡 From Arabic amir (commander), cognate with English admiral
Grammar spotlight
Pretérito indefinido vs. pretérito imperfecto
A2
In Spanish, the pretérito indefinido (simple past) expresses a completed action, as in amputaron (they amputated), cambió (it changed), supuso (it brought about). The pretérito imperfecto (imperfect) expresses repeated past actions or background descriptions, as in se hacían (they used to be done). Using both together makes a narrative more vivid.
“Durante gran parte de la historia, incluso las amputaciones se hacían con los pacientes completamente despiertos.”— For much of history, even amputations were performed with patients fully awake.
⚠️ Don't use the imperfect for a single completed action; for example, don't say "ayer amputaba"; say "ayer amputé".
Passive se + third person
B1
In Spanish, se + a third-person verb is often used to express passive meaning without specifying the agent, as in se practican (are performed), se introdujo (was introduced), se hacían (were done). This structure is very common in news and academic writing.
“Hoy se practican más de 350 millones de intervenciones quirúrgicas cada año bajo anestesia general.”— Today, more than 350 million surgical procedures are performed each year under general anesthesia.
⚠️ Note that the verb after se must agree in number with the subject, e.g., se practican (plural subject) vs. se practica (singular subject).
Sentence patterns to steal
Según la leyenda, el único anestésico que le dieron fue un trago de ron.
According to legend, the only anesthetic he was given was a swig of rum.
Según + noun, el único + noun + que + clause + fue + nounYou can replace leyenda with historia/relato, and anestésico with remedio/medicina.
De pronto, era posible desconectar temporalmente la consciencia de cualquier persona en cualquier momento.
Suddenly, it was possible to temporarily disconnect anyone's consciousness at any moment.
De pronto, era posible + infinitive + objectYou can replace desconectar with cambiar/controlar, and consciencia with mente/vida.
Sin embargo, todavía no está del todo claro cómo estos misteriosos fármacos nos hacen perder la consciencia.
However, it is still not entirely clear how these mysterious drugs make us lose consciousness.
Sin embargo, todavía no está del todo claro cómo + clauseYou can replace fármacos with sustancias/medicamentos, and perder la consciencia with dormir/despertar.
Comprender cómo funciona la anestesia puede arrojar luz sobre cómo opera nuestro cerebro.
Understanding how anesthesia works can shed light on how our brain operates.
Comprender cómo + clause + puede arrojar luz sobre cómo + clauseYou can replace anestesia with tecnología/ciencia, and cerebro with mente/cuerpo.
Admiral Nelson and Rum
Horatio Nelson was one of the most famous naval commanders in British history, and he died at the Battle of Trafalgar in 1805. Legend has it that when he lost his right arm in 1797, he relied only on rum for pain relief. Rum was a traditional ration in the British Navy, and sailors often mixed it with water. This story reflects the harsh reality of surgery before the invention of anesthesia.