What is the Casimir Effect? The Casimir effect is a small attractive force that acts between two close parallel uncharged conducting plates. It is due to quantum vacuum fluctuations of the electromagnetic field. The effect was predicted by the Dutch physicist Hendrick Casimir in 1948. According to the quantum theory, the vacuum contains virtual particles which are in a continuous state of fluctuation (see physics FAQ article on virtual particles).
1 Mild high blood pressure. 2  Hypothyroidism may slow the heart rate to less than 60 beats per minute, reduce the heart's pumping capacity, and increase the stiffness of blood vessel walls. 3  All of these effects may lead to high blood pressure.
In some patients with these symptoms, TSH and T4 levels can be within normal limits, which could lead health care providers to rule out low thyroid function. However, thyroid metabolism is complex, and each step can be influenced by nutrition, prescription medications and lifestyle factors. Considering these influences can help practitioners in their understanding of how patients can suffer from symptoms of hypothyroidism even when their blood levels appear normal.