Symptoms appear when the disease cause heart failure (weakness) or cardiac arrhythmia within coronary sinus anatomy.

These are:

• Fatigue and weakness
• Shortness of breath when you are active or lying on a flat
• Reduced exercise tolerance
• Dizziness, fainting
• Dry cough
• Swelling of the lower legs and feet
• Island abdomen (due to the presence of fluid)
• Rapid weight gain due to fluid retention in the body
• Lack of appetite, nausea
• Difficulty concentrating and drowsiness
• Feeling palpitations and / or irregular heartbeat

If you experience difficulty breathing or some of these symptoms, see your doctor.

What are the complications of function of coronary sinus?

Heart failure: poor blood flow through the left ventricle leads to heart failure

Restoring blood through the heart valve: enlargement of the left heart may aggravate heart valves to completely close, so the blood during contractions of the left ventricle back into the left atrium. This makes the heart pump less efficiently which leads to heart failure.

Edema (islands): because the heart cannot pump effectively, there is an accumulation of fluid in the lungs, abdomen, lower legs and feet.

Arrhythmia: changes in the structure of the heart cavities and hollows pressure and lead to heart rhythm disturbances.

Sudden cardiac arrest

Embolism: stagnation of blood in the left ventricle may lead to thrombus formation, which can be fired into the circulation and to block the flow of blood through an organ, and thus lead to stroke, heart attack, lung, kidney and so on.

Sources:

http://stop-sinusitis.net/antibiotics/what-is-the-best-antibiotic-for-a-sinus-infection

http://www.patient.co.uk/health/pilonidal-sinus