In extreme circumstances, such as for a major bleed when stocks of D-negative blood units are very low at the blood bank, D-positive blood might be given to D-negative females above child-bearing age or to Rh-negative males, providing that they did not have anti-D antibodies, to conserve D-negative blood stock in the blood bank. The converse is not true; Rh D-positive patients do not react to D negative blood. This same matching is done for other antigens of the Rh system as C, c, E and e and for other blood group systems with a known risk for immunization such as the Kell system in particular for females of child-bearing age or patients with known need for many transfusions. Plasma compatibility
Blood plasma compatibility is the inverse of red blood cell compatibility. Type AB plasma carries neither anti-A nor anti-B antibodies and can be transfused to individuals of any blood group; but type AB patients can only receive type AB plasma. Type O carries both antibodies, so individuals of blood group O can receive plasma from any blood group, but type O plasma can be used only by type O recipients. Table note
1. Assuming absence of strong atypical antibodies in donor plasma

Rh D antibodies are uncommon, so generally neither D negative nor D positive blood contain anti-D antibodies.
If atrial fibrillation with pre-excitation occurs, treatment options include procainamide, flecainide, propafenone, dofetilide, and ibutilide, since these medications slow conduction in the accessory pathway causing the tachycardia and should be administered before considering electrical cardioversion. Intravenous amiodarone may also convert atrial fibrillation and/or slow the ventricular response. Surgery
The Canadian Cardiovascular Society (CCS) recommends surgical intervention for these indications:
Limited exercise capacity (NYHA III-IV)
Increasing heart size (cardiothoracic ratio greater than 65%)
Important cyanosis (resting oxygen saturation less than 90% - level B)
Severe tricuspid regurgitation with symptoms
Transient ischemic attack or strokeThe CCS further recommends patients who require operation for Ebsteins anomaly should be operated on by congenital heart surgeons who have substantial specific experience and success with this operation. Every effort should be made to preserve the native tricuspid valve. History
Ebsteins anomaly was named after Wilhelm Ebstein, who in 1866 described the heart of the 19-year-old Joseph Prescher. References


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