Table of Contents
- Blood clot facts
- What are blood clots? What does a blood clot look like?
- What causes blood clots (blood clots in veins or arteries)?
- What causes blood clots (blood clots in the heart, leaking, and other causes)?
- What are the risk factors for blood clots?
- What types of conditions are caused by blood clots (DVT and pulmonary embolism)?
- What types of conditions are caused by blood clots (AFib, atrial thrombosis, and others)?
- What are the symptoms of blood clots?
- How are blood clots diagnosed?
- What tests are used to diagnose blood clots?
- What is the treatment for blood clots?
- What are the complications of blood clots?
- How can blood clots be prevented?
What types of conditions are caused by blood clots (AFib, atrial thrombosis, and others)?
An arterial thrombus stops the blood supply to the tissues beyond the blockage, depriving cells of oxygen and nutrients. This quickly leads to tissue death. Arterial thrombus is the mechanism that causes:
- heart attack (when it occurs in the coronary arteries that supply blood to the heart)
- stroke (when it occurs in arteries within the brain),
- peripheral vascular disease (occurring in the arteries of the legs), or
- ischemic bowel or mesenteric ischemia (when it occurs in the arteries that supply blood to the intestine)
Atrial fibrillation (AFib, AF)
In atrial fibrillation (AFib, AF), small clots may form along the walls of the atrium or the upper chambers of the heart. Should one of these clots break off, it may embolize, or travel in the bloodstream to the brain, blocking an artery and causing a stroke. Other arteries also may be involved when blood clots caused by the presence of AFib lodge and stop blood flow (embolize), including those that supply blood to the bowel. This can cause bowel ischemia and tissue death (potential necrosis) of the intestine. Clots also can affect blood supply to fingers and toes.
Other types of blood clots
Blood should clot anytime it becomes stagnant. This also means that clots will form when blood leaks out of blood vessels.
Examples include some of the following:
- With bleeding peptic ulcers, patients may rectal bleeding may also have clot mixed with the bloody stool if there has been time for the clot to form.
- Sometimes patients with urinary tract or bladder infections develop associated bleeding in their urine, and small clots can form. On occasion these clots may be so big that they cannot be passed and block the urethra, preventing urination and causing urinary retention.
- Vaginal bleeding is a normal event for most women in the reproductive years and occasionally, blood can pool in the vagina and form clots before being expelled. If clots form in the uterus, they may cause significant pain and pressure as they pass through the cervix while being expelled.