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DR Medhat MRCP

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Nerve Conduction Studies (NCS)<br />

- Are useful to determine axonal/demyelinating pathology:<br />

Demyelinating<br />

Axonal<br />

Reduced conduction velocity. Normal conduction velocity.<br />

Normal amplitude<br />

Reduced amplitude<br />

Autonomic Neuropathy<br />

features<br />

Impotence, inability to sweat.<br />

Postural hypotension e.g. Drop of 30/15<br />

mmHg.<br />

Loss of in heart rate following deep<br />

breathing.<br />

Pupils: dilates following adrenalin instillation<br />

Causes<br />

1) Diabetes<br />

2) Guillain-Barre syndrome<br />

3) Multisystem atrophy (MSA),<br />

Shy-Drager<br />

4) Parkinson's<br />

5) Infections: HIV, Chagas',<br />

neurosyphilis<br />

6) Drugs: antihypertensives,<br />

tricyclics<br />

7) Craniopharyngioma<br />

135

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