When looking the waveform of your patient with ongoing intracranial pressure monitoring, you know that which of the following is normal and to be expected?

A. The P2 wave is higher than P1 is incorrect because P2 reflects intracranial compliance, or the brain’s ability to accommodate changes in volume. When P2 becomes equal to or higher than P1, it indicates reduced compliance and rising intracranial pressure. This pattern is associated with conditions such as cerebral edema, intracranial bleeding, or mass lesions and represents an abnormal finding rather than a normal waveform. B. P1 wave is higher than P2 is correct because this represents a normal intracranial pressure waveform. P1, also known as the percussion wave, is generated by arterial pulsations transmitted from the choroid plexus during systole. When P1 is the highest peak, it indicates normal transmission of arterial pressure and normal intracranial compliance. The expected normal ICP waveform follows the pattern P1 greater than P2 greater than P3. C. P3 wave is higher than P1 is incorrect because P3, the dicrotic wave, corresponds to closure of the aortic valve during diastole and is normally the smallest component of the ICP waveform. An elevated P3 is not expected and suggests abnormal cerebrovascular dynamics or increased intracranial pressure. D. P3 is higher than P2 is incorrect because under normal conditions P3 remains lower than P2. If P3 exceeds P2, the waveform is considered abnormal and may indicate disrupted cerebral blood flow or altered pressure transmission within the cranial vault.