The sinus of your heart has nothing to do with your nose as you might guess; it’s a structure in the right atrium where blood ...

The sinoatrial (SA) node is the natural pacemaker of the heart. It generates electrical impulses that cause the heart’s chambers to contract, setting the heart rate. The SA node typically generates 60 ...

Subscribe to The St. Louis American‘s free weekly newsletter for critical stories, community voices, and insights that matter. Sign up Most patients whose breast cancer has spread to their lymph nodes ...

Lymph node dissections, or lymphadenectomies, are surgical procedures that play an important role in cancer treatments. A healthcare professional will remove the lymph nodes and check a tissue sample ...

A genomic test co-developed by Mayo Clinic and SkylineDx can identify whether people with melanoma are at low or high risk for cancer in their lymph nodes—a finding that could guide treatment ...

Most older patients with ER-positive DCIS undergoing mastectomy can avoid axillary surgery, reducing unnecessary procedures. Axillary surgery is overused in patients aged 70 and older, with 93% ...

Dear Dr. Roach: At age 76, I was diagnosed with sinus node dysfunction last year after several episodes of what I’d call being “spaced out” (for lack of a better term). I couldn’t explain these ...