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What are the indications and contraindications of iron lung,hearing aids,ventillator,suction and ultrasound? - suction ironing board

The type of polio iron lung in 1940. Now we use the positive pressure ventilation through a tube or tracheotomy.

Notes on a ventilator have trouble breathing, or a condition that the ventilation) (and a lot of general anesthesia.

Ultrasound is too broad - there are hundreds of signs of use of ultrasound. The same with aspiration.