Bladder, overactive: A condition in which sudden involuntary contractions of the muscular wall of the bladder cause urinary urgency, immediate and unstoppable needs to urinate. Overactive bladder is a form of urinary incontinence (the unintentional loss of urine) and is relatively common, particularly in older adults. Treatment may include pelvic muscle strengthening, behavioral therapy, and medications. Also called urge incontinence.
- Blade bone
Blade bone: Familiar term for the scapula, also called the shoulder blade or wing bone, the flat triangular bone at the back of the shoulder.
- Blalock-Taussig operation
Blalock-Taussig operation: A pioneering operation to treat children born with the heart malformation tetralogy of Fallot named for the US surgeon Alfred Blalock and the US pediatric cardiologist Helen B. Taussig.
- Blast phase
Blast phase: Refers to advanced chronic myelogenous leukemia. In this phase, the number of immature, abnormal white blood cells in the bone marrow and blood is extremely high. Also called blast crisis.
Blastocyst: A thin-walled hollow structure in early embryonic development that contains a cluster of cells called the inner cell mass from which the embryo arises. The outer layer of cells gives rise to the placenta and other supporting tissues needed for fetal development within the uterus while the inner cell mass cells gives rise to […]
- Blastocystis hominis
Blastocystis hominis: The parasitic organism that causes blastocystosis. See Blastocystosis.