Splenectomy and post-splenectomy complications are a common topic in the SAQs. Specific details have been explored in Question 18 from the second paper of 2007. There are two main issues of management: one, of asplenic immunosuppression, and two- of protection from post-splenecotmy thrombocytosis.
Thrombosis after splenectomy has an incidence of about 5%, and can be managed wth either aspirin or (in extreme circumstances) with hydroxyurea.
The vaccinations prevent severe infection by encapsulated organisms - because the encapsulated organisms are poorly opsonised by complement, and the spleen was the only organ which could remove them. Thus, one must protect this patient from these bugs. There has been a 2011 revision of the guidelines for such prophylaxis:
Cadili, Ali, and Chris de Gara. "Complications of splenectomy." The American journal of medicine 121.5 (2008): 371-375.
Di Sabatino, Antonio, Rita Carsetti, and Gino Roberto Corazza. "Post-splenectomy and hyposplenic states." The Lancet 378.9785 (2011): 86-97.
Hirsh, J., J. A. McBride, and J. V. Dacie. "Thrombo-embolism and increased platelet adhesiveness in post-splenectomy thrombocytosis." Australasian annals of medicine 15.2 (1966): 122-128.
Davies, John M., et al. "Review of guidelines for the prevention and treatment of infection in patients with an absent or dysfunctional spleen: Prepared on behalf of the British Committee for Standards in Haematology by a Working Party of the Haemato‐Oncology Task Force." British journal of haematology 155.3 (2011): 308-317.
Khan, Palwasha N., et al. "Postsplenectomy reactive thrombocytosis."Proceedings (Baylor University. Medical Center) 22.1 (2009): 9.