science

Los Angeles Prehospital Stroke Screen

Los Angeles Prehospital Stroke Screen is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Los Angeles Prehospital Stroke Screen rather than just read about it. In short: The Los Angeles Prehospital Stroke Screen (abbreviated LAPSS) is a method of identifying potential stroke patients in a pre-hospital setting. Screening criteria No history of seizures or epilepsy Age 45 years or older At baseline, patient is not bedridden and does not use a wheelchair Blood glucose between 60 and 400 mg/dL Obvious asymmetry-unilateral weakness with any of the following motor exams: Facial Smile/Grim…

Key takeaways

Los Angeles Prehospital Stroke Screen belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Los Angeles Prehospital Stroke Screen to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Los Angeles Prehospital Stroke Screen from memory before moving on to harder problems.

Reference excerpt

The Los Angeles Prehospital Stroke Screen (abbreviated LAPSS) is a method of identifying potential stroke patients in a pre-hospital setting.

Screening criteria No history of seizures or epilepsy Age 45 years or older At baseline, patient is not bedridden and does not use a wheelchair Blood glucose between 60 and 400 mg/dL Obvious asymmetry-unilateral weakness with any of the following motor exams: Facial Smile/Grimace Grip Arm Strength If all of the above criteria are met (or not ascertainable) the LAPSS is positive for stroke. Patients may still be experiencing a stroke even if LAPSS criteria are not met.

Validity A January 2000 study, conducted by 3 teams of Los Angeles-based paramedic units resulted in "sensitivity of 91% (95% CI, 76% to 98%), specificity of 97% (95% CI, 93% to 99%), positive predictive value of 86% (95% CI, 70% to 95%), and negative predictive value of 98% (95% CI, 95% to 99%). With correction for the 4 documentation errors, positive predictive value increased to 97% (95% CI, 84% to 99%)." In a Chinese study, Beijing paramedics using the protocol, completed LAPSS screenings in an average of 4.3±3.0 minutes (median, 5 minutes). The study resulted in a sensitivity of 78.44% and a specificity of 90.22%.

See also FAST (stroke) Cincinnati Prehospital Stroke Scale

References

Worked examples

Example 1 — a first encounter with Los Angeles Prehospital Stroke Screen

Start with the simplest possible case. Write down what Los Angeles Prehospital Stroke Screen claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Los Angeles Prehospital Stroke Screen before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Los Angeles Prehospital Stroke Screen ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Los Angeles Prehospital Stroke Screen

In research: Los Angeles Prehospital Stroke Screen appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Los Angeles Prehospital Stroke Screen in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Los Angeles Prehospital Stroke Screen is common in secondary-school and first-year university syllabi. It links to neighbouring topics Emergency medical services in the United States, Medical assessment and evaluation instruments, Stroke, so understanding it makes those chapters shorter.
In everyday life: Look for Los Angeles Prehospital Stroke Screen outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Los Angeles Prehospital Stroke Screen in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Los Angeles Prehospital Stroke Screen means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Los Angeles Prehospital Stroke Screen out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Los Angeles Prehospital Stroke Screen in simple terms?

The Los Angeles Prehospital Stroke Screen (abbreviated LAPSS) is a method of identifying potential stroke patients in a pre-hospital setting. Screening criteria No history of seizures or epilepsy Age 45 years or older At baseline, patient is not bedridden and does not use a wheelchair Blood glucose…

Why does Los Angeles Prehospital Stroke Screen matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Los Angeles Prehospital Stroke Screen?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Los Angeles Prehospital Stroke Screen.