Ingestion of foreign bodies

Hazardous objects that can be ingested include:

• button batteries and other batteries
• sharp objects
• magnets
• very large objects
• filled balloons, etc

Read more about the causal effects of ingestion of foreign objects, both hazardous and non-hazardous, and the assessment and management .

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All you need to know about ‘U’ waves

A U wave is a small, rounded wave that follows the T wave on an electrocardiogram. Normally its polarity is that of the T wave. Its mechanism is unknown. The U wave becomes taller in hypokalaemia and inverted in heart disease. It may signify decreased potassium levels in the blood. Read more about U waves here.