MRI

Question 1

Acute to chronic blood appearance on MRI?

Answer 1

Iddy biddy baby daddy

Question 2

What are pathological ICP waveforms?

Answer 2

1. Lundberg A waves (plateau waves).
   These indicate an abrupt increase in ICP ≥50 mm Hg for 5–20 minutes followed by rapid fall in ICP. The plateau wave represents a transient increase CBV, possibly secondary to CO2 retention.
2. Lundberg B waves (pressure pulses).
   Amplitude of 10–20 mmHg with rhythmic variation 0.5–2 min.
3. Lundberg C waves.
   Frequency of 4–8/min. Low amplitude C waves may be seen in a normal ICP waveform. High amplitude C wave may be pre-terminal, and may sometimes be seen on top of plateau waves.

Question 3

Risk factors of high ICP even if normal CT?

Answer 3

• age over 40 years,
• unilateral or bilateral motor posturing,
• or systolic blood pressure <90 mm Hg.