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Heart flutter meaning1/24/2024 ![]() The cause of premature ventricular contractions isn't always clear. The contractions usually beat sooner than the next expected heartbeat. PVCs are irregular contractions that start in the ventricles instead of the atria. In a typical heart, this heart signaling process usually goes smoothly, resulting in a resting heart rate of 60 to 100 beats a minute. ![]() When the electrical signals reach the ventricles, the chambers contract and pump blood to the lungs or to the rest of the body. This slight delay allows the ventricles to fill with blood. Next, the signals arrive at a cluster of cells called the AV node, where they slow down. These electrical signals move across the atria, causing the heart muscles to squeeze (contract) and pump blood into the ventricles. The sinus node sends electrical signals that typically start each heartbeat. The heart's rhythm is controlled by a natural pacemaker (the sinus node) in the right upper chamber (atrium). The heart is made of four chambers - two upper chambers (atria) and two lower chambers (ventricles). To understand the cause of premature ventricular contractions (PVCs), it might help to learn more about how the heart typically beats. The signal travels through the atria to the atrioventricular (AV) node and then passes into the ventricles, causing them to contract and pump out blood. In a typical heart rhythm, a tiny cluster of cells at the sinus node sends out an electrical signal (impulse).
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