[Preoperative coagulation screening prior to adenoidectomy and tonsillectomy]. / Präoperatives Screening auf Gerinnungsstörungen vor Adenotomie und Tonsillektomie.

ABSTRACT

BACKGROUND: Laboratory tests are widely used to screen children with planned surgery to detect unknown coagulation defects. This study investigates the predictive value of commonly used coagulation tests (thromboplastin time, partial thromboplastin time and thrombocyte count) compared with a standardized bleeding history. PATIENTS In 702 patients 500 adenoidectomies and 500 tonsillectomies were done, results of laboratory evaluation and individual bleeding history were evaluated. RESULTS: 9.4 % of all laboratory tests showed abnormal results. 30.5 % of the children awaiting adenoidectomy had a suspicious bleeding history as had 22 % of patients undergoing tonsillectomy. In the clinical course of adenoidectomy no bleeding occurred. After tonsillectomy 15 children (3 %) showed moderate, 12 patients (2.4 %) severe postoperative bleeding. The positive predictive value of coagulation screening reached 6.8 % whereas history alone predicted 9.2 % of observed post tonsillectomy bleeding. CONCLUSIONS: The results of this study demonstrate the lacking effect of laboratory tests to predict postoperative bleeding complications. Taking a careful history of bleeding risks and testing only patients with suspicious history reduces the risk of bleeding more effective. Counseling about bleeding symptoms and postoperative survey of patients are additional measures which may protect the children.