Glossary entry (derived from question below)
English term or phrase:
flatline
Spanish translation:
línea plana
English term
flatline
Country and dialect: Mexico
Target audience: adult readers in Mexico
Specific context: a paramedic is telling a doctor, "the patient just lost his pulse. He's flatline".
Flatline in this case refers to having no register on an electric monitor (here is a link for the definition: https://www.merriam-webster.com/dictionary/flatline).
Note: I can't write that the patient is dead because the patient actually survives, and I can't write the he doesn't have a pulse, because, as you can see, they said that in the previous sentence.
| 3 +1 | línea plana |
Beatriz Ramírez de Haro
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| 4 +1 | electro plano |
Chema Nieto Castañón
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| 3 | da una señal plana / tiene un paro cardíaco / la señal del pulso está plana |
JohnMcDove
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PRO (2): JohnMcDove, Beatriz Ramírez de Haro
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Proposed translations
Spain
Golf, Literature and Religion Specialist
Native in: Spanish 
Works in: English to Spanish, French to Spanish, Spanish
línea plana
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Note added at 11 mins (2018-03-23 20:42:16 GMT)
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FLATLINE - Definición y sinónimos de flatline en el diccionario inglés
https://educalingo.com/es/dic-en/flatline
Cuando un paciente presenta una línea plana cardíaca, el tratamiento de elección es una inyección de vasopresina y compresiones torácicas. La reanimación exitosa es generalmente improbable y está inversamente relacionada con el tiempo que pasó intentando la reanimación.
definición de flatline en el diccionario inglés
The definition of flatline in the dictionary is to die or be so near death that the display of one's vital signs on medical monitoring equipment shows a flat line rather than peaks and troughs. Other definition of flatline is to remain at a continuous low level.
Spain
Psychologist & Emergency Physician
Native in: Spanish (Variant: Standard-Spain) 
Works in: English to Spanish
electro plano
El paciente acaba de perder el pulso. Tiene un electro plano
| agree |
JohnMcDove
: También... :-) Como le digo a Beatriz... ¡Buen finde!
1 hr
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Buen finde, John. Grax!
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United States
da una señal plana / tiene un paro cardíaco / la señal del pulso está plana
El paciente no tiene pulso. Está plano en el monitor.
El paciente se ha quedado sin pulso. Mira la línea plana en la pantalla.
El paciente no tiene pulso. La línea está plana (en el monitor).
El paciente sin pulso: la línea plana. (Una opción más telegráfica).
El paciente acaba de perder el pulso. La línea está plana.
Saludos cordiales.
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Note added at 2 hrs (2018-03-23 22:58:12 GMT)
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Otro par de opciones serían:
No tiene signos vitales.
No tiene señales vitales.
O sea, parece que si el médico no hace algo, se va a morir, o parece muerto...
Supongo que le dan al desfibrilador, y restablecen el ritmo cardíaco...
http://dle.rae.es/?id=Cyrt2jE
Eso, o a mano.
Ah, otra idea: "no tiene ritmo cardiaco", "se ha quedado sin respuesta cardíaca", aunque estas opciones resultan más larguitas.
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Note added at 32 days (2018-04-25 04:38:46 GMT) Post-grading
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Ah, otra buena: "sin muestra de constantes vitales"...
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