Neonatal rhythmic/periodic duration, polarity, and sharpness modifiers

Criteria & assessment

• Record typical duration and preferably longest continuous duration: very long >=1 hour; long 5-59 minutes; intermediate 1-4.9 minutes; brief 10-59 seconds; very brief <10 seconds without evolution.
• Determine predominant-phase polarity in a traditional bipolar montage as positive, negative, or unclear.
• Measure sharpness at baseline for predominant and sharpest phase: spiky <100 ms; sharp 100-200 ms; sharply contoured theta/delta is >200 ms with steep or pointed morphology; blunt is smooth or sinusoidal.