Leucocyte scintigraphy or computed tomography for the febrile post-operative patient?
OBJECTIVE
The optimal initial investigation for the post-operative patient with suspected occult intra-abdominal sepsis is controversial, although the diagnostic accuracy of a variety of techniques is known. Our objective is to determine which investigation has the greatest positive effect on patient management.


METHODS
We reviewed 67 consecutive post-operative patients investigated for suspected occult sepsis retrospectively and analysed the sequence of investigations required to achieve the diagnosis depending on the choice of initial investigation, and the interval between between initiating investigations and performing definitive percutaneous drainage.


RESULTS
Forty patients had scintigraphy as the initial investigation and 21 of these went on to require CT. None of the 27 patients who had CT as the initial investigation required any other imaging (chi 2 = 20.6, P < 0.0001) and appropriate percutaneous drainage was offered immediately. Conversely, the average interval to drainage in those who had scintigraphy first was 3.1 days. Fourteen out of 20 patients (70%) who had scintigraphy as the initial investigation following recent surgery, and 7 of 20 (35%) following old surgery, needed subsequent CT. None of the 20 and 7 patients in the recent and old surgery groups respectively who had CT initially required further imaging.


CONCLUSIONS
Our results suggest recommending CT as the initial investigation in the early post-operative period as this will reduce the total number of investigations required to achieve the diagnosis and the time to definitive drainage. In the late post-operative period, scintigraphy will resolve the majority of problems.
Bearcroft
P W
PW
Department of Radiology, Addenbrooke's Hospital, Cambridge, UK. pwpb@radiol.cam.ac.uk
Miles
K A
KA
D000005:Abdomen / Q000601:surgery*; D018784:Abdominal Abscess / Q000000981:diagnostic imaging* / Q000628:therapy; D001012:Aorta, Abdominal / Q000601:surgery; D001062:Appendectomy / Q000009:adverse effects; D003106:Colon / Q000601:surgery; D003287:Contrast Media; D004322:Drainage; D005334:Fever; D006801:Humans; D007205:Indium Radioisotopes; D007479:Iopamidol; D016030:Kidney Transplantation / Q000009:adverse effects; D007813:Laparotomy / Q000009:adverse effects; D007962:Leukocytes; D016031:Liver Transplantation / Q000009:adverse effects; D011183:Postoperative Complications / Q000000981:diagnostic imaging* / Q000628:therapy; D011877:Radionuclide Imaging; D012189:Retrospective Studies; D018805:Sepsis / Q000000981:diagnostic imaging; D013997:Time Factors; D014057:Tomography, X-Ray Computed
D003287:Contrast Media; D007205:Indium Radioisotopes; D007479:Iopamidol