Aim: To establish if the NELA risk calculator underestimates mortality risk in older adults undergoing laparotomy for mesenteric or colonic ischaemia. Methods: A retrospective search of the operative database was performed for all patients over age 65 years who underwent laparotomy across two tertiary centres over a 3-year period. Cases of mesenteric or colonic ischaemia were identified from the operative records. Cases where ischaemia occurred secondarily to a primary obstructive or other pathology were excluded. Cases where a NELA score was not documented preoperatively were excluded. We then compared the NELA scores to the observed 30-day mortality rate. Secondary outcomes were hospital length of stay and intensive care unit length of stay. Results: Sixty cases were included in our analysis. There were 27 cases of colonic ischaemia and 33 cases of mesenteric ischaemia (mesenteric ischaemia group included five cases of distal small-bowel and colonic ischaemia). The overall mean NELA score was 21.9%, while the actual 30-day mortality was 43.3% (p=0.0094). Mean NELA score for mesenteric ischaemia cases only was 20.6% with an actual mortality rate of 45.5%. Mean NELA score for the colonic ischaemia cases was 23.5% with an actual mortality rate of 40.7%. The median time from operation to mortality was 8 days. Mean age was 77 years. Length of stay for survivors was a mean 27 days with intensive care unit length of stay of 9.3 days. Conclusion: The NELA risk score for mortality post-emergency laparotomy underestimates mortality risk by a factor of two in older adults where the primary pathology is mesenteric or colonic ischaemia.

We present a case of extensive stage small cell lung cancer presenting as perforated appendicitis secondary to an appendiceal metastasis. This is a rare presentation with only six reported cases in the literature. Surgeons must be aware of unusual causes for perforated appendicitis as in our case the prognosis can be dire. A 60-year-old man presented with an acute abdomen and septic shock. Urgent laparotomy and a subtotal colectomy were performed. Further imaging suggested the malignancy was secondary to a primary lung cancer. Histopathology demonstrated a ruptured small cell neuroendocrine carcinoma in the appendix with thyroid transcription factor 1 positive immunohistochemistry. Unfortunately, the patient deteriorated due to respiratory compromise and was palliated day six postoperatively. Surgeons should consider a broad differential diagnosis for the cause of acute perforated appendicitis as this can rarely be due to a secondary metastatic deposit from a widespread malignant process.

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