The coronary sinus is the largest cardiac venous structure. It arises from the confluence of the oblique vein (of Marshall) of left atrium and the great cardiac vein. The sinus then courses for about 2 or 3 cm within the posterior atrioventricular groove, between the left atrium and left ventricle.

What are the symptoms of a sinus infection? Sinusitis symptoms can be similar to cold symptoms. But it may also cause: facial pain or pressure infected nasal discharge nasal congestion.

By convention, the term "normal sinus rhythm" is taken to imply that not only are the P waves (reflecting activity of the sinus node itself) normal in morphology but that all other ECG measurements are also normal.[3] [5] Criteria therefore include: Normal heart rate (classically 60 to 100 beats per.

As such, sinus tachycardia can be thought of as a sinus-driven rhythm (normal-appearing P wave axis on the surface ECG) which is occurring at a rate of greater than 100 beats per minute ( waveform 2 ). However, the "normal" heart rate is, in part, the result of the complex interplay between the sympathetic and parasympathetic nervous systems.

Some signs that you may have sinus bradycardia include: being lightheaded or dizzy. feeling fatigued or weak. having trouble exercising. chest pain. shortness of breath. fainting.

Sinus bradycardia is a type of slow heartbeat. A special group of cells begin the signal to start your heartbeat. These cells are in the sinoatrial (SA) node. Normally, the SA node fires at about 60 to 100 times per minute at rest. In sinus bradycardia, the node fires less than 60 times per minute. Skip to main content Kettering Health Search Menu

Within the upper right chamber of the heart (right atrium) is a group of cells called the sinus node. The sinus node is the heart's natural pacemaker. It produces the signal that starts each heartbeat. Bradycardia occurs when these signals slow down or are blocked. Sinus node problems

Normal sinus rhythm (NSR) is the rhythm that originates from the sinus node and describes the characteristic rhythm of the healthy human heart. The rate in NSR is generally regular but will vary depending on autonomic inputs into the sinus node. When there is irregularity in the sinus rate, it is termed "sinus arrhythmia."

Others may experience: Fainting (syncope) Lightheadedness or dizziness Rapid heartbeat or palpitations Fluttering in the chest Bounding pulse Chest discomfort Shortness of breath Fatigue

This is referred to as normal sinus rhythm. With exercise, the heart rate will increase to above 100 times per minute. A person’s peak heart rate can be calculated by subtracting their age from 220. For example, the peak heart rate for a 40 year old is 220 − 40 = 180. What are the symptoms of arrhythmia?

2 Answers Sorted by: 6 Basically you have a normal ECG reading according to the machine. Sinus rhythm ( as explained in the first section of this book chapter) is normal, meaning that the heart is depolarized by a wave starting in the sinus node. That is the first part of the message.

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