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Category Differential diagnosis
CCC Critical Care Compendium 680

Asterixis DDx

Asterixis is the sudden loss of muscle tone during sustained contraction of an outstretched limb. It is associated with a silent period on EMG, distinguishing it from myoclonus, and is sometimes referred to as ‘negative myoclonus’.
CCC Critical Care Compendium 680

Intracranial calcification DDx

Intracranial calcification may be divided into neoplastic, vascular, infectious or miscellaneous causes; basal ganglia calcification suggests specific underlying causes.
CCC Critical Care Compendium 680

Fixed dilated pupil DDx

Suspect herniation due to an intracranial mass lesion as a cause of fixed dilated pupil in an unconscious patient. A fixed dilated pupil in an awake patient is NOT due to herniation.
CCC Critical Care Compendium 680

Pseudofracture DDx

There are multiple reasons why lucent lines may appear in bones, or why bone contours may appear abnormal, mimicking fractures.
CCC Critical Care Compendium 680

Bronchiectasis DDx

Bronchiectasis is a suppurative lung disease characterised by the presence of permanently and abnormally widened (dilated) bronchial airways. Bronchiectasis may be the end result of a number of etiological processes.
CCC Critical Care Compendium 680

Arthritis DDx

Arthritis is inflammation of a joint (redness, warmth, pain, swelling, loss of function) that may be acute or chronic, and affect one or multiple joints.
CCC Critical Care Compendium 680

Hilar adenopathy DDx

Hilar lymphadenopathy, seen on chest x-ray or chest CT, can be classified as unilateral or bilateral, and if bilateral as symmetrical or asymmetrical.
CCC Critical Care Compendium 680

Atrial Fibrillation DDx

Atrial fibrillation is an irregularly irregular tachydysrhythmia characterised by the presence of chaotic fibrillation waves on ECG, rather than p waves, due to disorganised electrical activity in the atria.