Pathological changes in the sinoatrial node tissues of rats caused by pulsed microwave exposure.

To observe microwave induced dynamic pathological changes in the sinus nodes,wistar rats were exposed to 0,5,10,50 mW/cm2 microwave.In 10 and 50 mW/cm2 groups,disorganized sinoatrial node cells,cell swelling,cytoplasmic condensation,nuclear pyknosis,and anachromasis,swollen,and empty mitochondria,and blurred and focally dissolved myofibrils could be detected from1 to 28 d,while reduced parenchymal cells,