In a patient with an acute non‑hemorrhagic infarct in the left temporo‑parietal region within the middle cerebral artery (MCA) territory, what clinical findings can be expected, and what are the prognosis and recommended treatment?

Clinical Presentation of Left Temporo-Parietal MCA Infarct

A left temporo-parietal MCA territory infarct typically presents with right-sided hemiparesis (face, arm, and leg), right hemisensory loss, right homonymous hemianopia, and global aphasia (or Wernicke's aphasia if primarily temporal), often with reduced consciousness in larger infarcts 1.

Expected Clinical Findings

The left MCA territory supplies critical language and sensorimotor cortex. You should specifically assess for:

• Motor deficits: Right-sided weakness affecting face, arm, and leg (arm typically worse than leg due to MCA distribution)
• Sensory loss: Right hemisensory deficits in the same distribution
• Visual field defects: Right homonymous hemianopia from involvement of optic radiations
• Language dysfunction:
  • Global aphasia if both Broca's and Wernicke's areas are affected
  • Wernicke's (receptive) aphasia if primarily temporo-parietal
  • Conduction aphasia if arcuate fasciculus is involved
• Cortical signs: Neglect, apraxia, agnosia
• Level of consciousness: Alertness initially, but watch for deterioration with large infarcts

The combination of hemiplegia, hemisensory loss in face/arm/leg, hemianopia, and global aphasia has a positive predictive value of 0.73 for large MCA infarction 1.

---

Prognosis

Size-Dependent Outcomes

Prognosis depends critically on infarct size and whether the patient develops malignant cerebral edema.

Large/Complete MCA Territory Infarcts

If the infarct involves ≥2 of 3 MCA subterritories (deep, superficial anterior, superficial posterior):

• Mortality: 17-78% depending on development of malignant edema 2, 1
• Severe disability: 50% of survivors 1
• Brain edema deaths: Occur in younger patients (mean age 57 vs 73 years) and earlier (mean 5 days vs 37 days) 1

Prognostic Warning Signs

Independent predictors of death or severe disability 1:

• Reduced consciousness on admission
• Hemianopia
• Complete MCA territory involvement
• Coma on day of admission strongly predicts brain death from herniation

Smaller/Strip Infarcts

For limited cortical strip infarcts in the MCA territory: prognosis is generally good with mild-to-moderate deficits 3.

---

Treatment

Acute Phase (<24 Hours)

1. Reperfusion Therapy (Time-Critical)

Mechanical thrombectomy with stent retrievers is the first-line treatment for proximal MCA (M1) occlusions when initiated within 6 hours of symptom onset 4, 5.

Key treatment algorithm:

• IV alteplase (tPA): Administer within 4.5 hours if eligible; do NOT delay for imaging if thrombectomy is planned 5
• Mechanical thrombectomy:
  • Class I indication for M1 MCA occlusions within 6 hours 5
  • Use stent retrievers (preferred over older MERCI devices) 5
  • Target TICI 2b/3 reperfusion 5
  • Consider proximal balloon guide catheter with stent retrievers 5

Blood pressure management during thrombectomy 4:

• Maintain BP ≤180/105 mmHg during and for 24 hours after procedure
• If successful reperfusion achieved, keep BP <180/105 mmHg

2. Antiplatelet Therapy

Administer aspirin 160-300 mg within 24-48 hours of stroke onset 4.

• If IV alteplase given: delay aspirin until 24 hours post-tPA
• Exception: May give earlier if withholding poses substantial risk from concomitant conditions

3. Monitoring for Malignant Edema

Critical monitoring period: Days 2-5 post-stroke 2, 1.

Watch for:

• Declining consciousness
• Pupillary changes
• Worsening motor deficits
• Signs of herniation

Decompressive hemicraniectomy should be considered early in patients developing malignant edema, particularly in younger patients, though outcomes remain poor even with surgery 6.

---

Secondary Prevention

Identify Stroke Mechanism

The temporo-parietal location suggests embolic etiology. Investigate for 3, 1:

1. Cardiac sources (most common for large MCA infarcts):

   • Atrial fibrillation (33% of large MCA infarcts without ICA occlusion) 1
   • Other cardioembolic sources (54% total) 1

2. Large artery disease:

   • ICA occlusion (41% of large MCA infarcts) 1
   • ICA dissection (12%) 1
   • Artery-to-artery embolism 3

Anticoagulation for Atrial Fibrillation

If atrial fibrillation is identified, initiate direct oral anticoagulants (DOACs) within 4 days for minor-to-moderate strokes 7.

• Early initiation (within 4 days) reduces recurrent ischemic events (RR 0.77) without increasing hemorrhagic complications 7
• Even in severe strokes, early DOAC initiation is indicated over delayed treatment 7

---

Common Pitfalls

1. Delaying thrombectomy to observe tPA response: This is NOT recommended and worsens outcomes 5

2. Underestimating malignant edema risk: The 2-5 day window is critical; younger patients with large infarcts are highest risk 2, 1

3. Missing atrial fibrillation: Obtain ECG and cardiac monitoring, as AF may be newly diagnosed and is present in one-third of large MCA infarcts 1, 6

4. Inappropriate BP targets: Maintain BP ≤180/105 mmHg after thrombectomy, not the higher targets sometimes used in non-reperfused strokes 4