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Systolic and diastolic pressures approaching each other is a sign of pericardial tamponade which is when fluid begins to fill the sac around the heart (pericardium). This will cause pressure to increase on the heart which will decrease the pumping power of the heart. The heart will not be able to circulate the blood effectively so the body will begin to go into shock (diaphoretic extremities, increased pulse, increased respirations). As the pressure on the heart increases, the heart is working so hard that it begins to tire and could go into arrest. Cardiac arrest, if not defibrillated, will lead to death.

- Ben, NREMT-B student

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Q: What will happen if the diastolic is equal to the systolic?
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