As a medical professional with expertise in cardiology, I can provide you with an accurate description of sinus rhythm. Sinus rhythm is the normal electrical activity of the heart. It originates from the sinoatrial (SA) node, which is the heart's natural pacemaker located in the upper right chamber, known as the right atrium. The SA node sends electrical impulses that travel through the heart muscle, causing the atria to contract and pump blood into the ventricles. Following this, the impulses reach the atrioventricular (AV) node, which is located in the lower part of the heart, and then the ventricles contract to pump blood out to the body. The rate of a sinus rhythm typically ranges from 60 to 100 beats per minute (BPM) for adults at rest. However, this rate can vary depending on factors such as age, physical fitness, and certain medications. A sinus rhythm that is faster than 100 BPM is called tachycardia, and one that is slower than 60 BPM is referred to as bradycardia. It's important to note that while a sinus rhythm is the desired heart rhythm, variations within the normal range are not typically a cause for concern unless accompanied by symptoms or other health issues. read more >>

Sinus rhythm: The normal regular rhythm of the heart set by the natural pacemaker of the heart called the sinoatrial (or sinus) node. It is located in the wall of the right atrium (the right upper chamber of the heart).read more >>