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Medicine

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Respiratory

Question
11 out of 11
 

Caisson's disease is (AIIMS Nov 2010)



A Gas embolism

B Fat embolism

C Amniotic fluid embolism

D Tumor embolism

Ans. A

Gas embolism

Ref. Robbins (Basic of Pathology), 7th edition, Page no 136,446

Decompression (Caisson) Disease.

1). Encountered in deep-sea divers and underwa­ter workers.

2). As the underwater depth and consequent atmospheric pressure increase, increasing amounts of oxygen and

3). accompanying gases (nitrogen or helium) dissolve in the blood and tissue fluids.

4). Once ascent begins (decompression), the dissolved gases come out of solu­tion and form minute bubbles in the bloodstream and tissues,

5). Coalescence of these bubbles produces even larger masses capable of becoming significant emboli in the bloodstream.

6). Peri­articular bubbles produce the bends. Bubbles formed within the lung or gaseous emboli give rise to respiratory difficulties, with severe substernal pain referred to as the chokes.

7). Gas emboli may also induce focal ischemia in a number of tissues, including brain and heart (machinery murmur). In the lungs, edema, hemorrhages, and focal atelectasis or emphysema may appear, leading to respiratory distress, the so-called chokes.

8). Treatment: placing the individual in a compression chamber where the baromet­ric pressure may be raised, thus forcing the gas bubbles back into solution.

Respiratory Flashcard List

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