ModulePublishedclinician-educationstroke-escalationlocalization

Supplementary motor area (SMA) strokes — initiation problems, ‘alien hand’, and detection (Advanced)

Advanced course: SMA strokes (often ACA/MCA border) can cause trouble initiating movement/speech, gait-start hesitation, and sometimes ‘alien hand’ phenomena. Learn ischemic vs hemorrhagic differences and how MRI/CT localize.

Recovery & RehabCaregiver, SurvivorAdvanced24 minGrade 11

Educational only

Educational only — not medical advice.

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If a patient develops new or worsening stroke symptoms, reduced consciousness, seizure, severe headache, airway/swallowing danger, or unstable vital signs, activate emergency response and follow local stroke escalation protocols.

Key takeaways

  • Recognize SMA-related symptoms (initiation, akinesia, gait start)
  • Explain ‘alien hand’ as a brain network symptom
  • Explain how ACA territory and medial frontal location relate to SMA deficits
  • Know how CT/MRI detect ischemic vs hemorrhagic injury and what rehab targets help

Why this matters

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Clinical frame

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Core clinical idea

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Assessment and workup

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Clinical reasoning pathway

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Management and team actions

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Common pitfalls

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Patient-safe explanation

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Escalation and safety signals

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Applied case

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Clinical scenario

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Common misconceptions

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Reflect

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Key takeaways

  • Recognize SMA-related symptoms (initiation, akinesia, gait start)
  • Advanced stroke care requires reconciling the clinical syndrome with timing, imaging, medication risk, patient context, and local pathway capacity.
  • A safe plan names escalation thresholds, responsible clinicians, patient-facing instructions, and the next step if results or symptoms change.

Practice check

What you’ll practice

These questions are untimed. After you answer all of them, you’ll see your score and a clear next lesson or reference step.

0 of 4 answered

Question 1

1. A learner is applying this lesson on Supplementary motor area (SMA) strokes — initiation problems, ‘alien hand’, and detection. Which approach best reflects advanced clinical reasoning?

Question 2

2. Which actions show safe handling of Supplementary motor area (SMA) strokes — initiation problems, ‘alien hand’, and detection? Select all that apply.

Question 3

3. Place the safe clinical sequence for Supplementary motor area (SMA) strokes — initiation problems, ‘alien hand’, and detection in order.

Question 4

4. For Supplementary motor area (SMA) strokes — initiation problems, ‘alien hand’, and detection, a normal or non-specific early test result is enough to stop reassessment when the clinical syndrome still suggests risk.

References

  1. Tier 2RadiologyInfo.org2025
    CT Angiography of the Head
  2. Tier 2RadiologyInfo.org2025
    Magnetic Resonance Imaging (MRI) - Head
  3. Tier 1American Heart Association/American Stroke Association2019
    Guidelines for the Early Management of Patients With Acute Ischemic Stroke: 2019 Update