Israel Medical Association Journal

Background: Postoperative atrial fibrillation (POAF) is well recognized after cardiac surgery; however, its incidence and clinical course following non-cardiac surgery (NCS) remain unclear.

Objectives: To evaluate the association between POAF after NCS, patient co-morbidities, and type of surgery.

Methods: In this retrospective cohort study, patients who underwent NCS at a private hospital network between 2016 and 2023 were included. Patients with a history of atrial fibrillation (AF) were excluded. Patients who developed POAF within 24-48 hours were compared with those who did not. To address baseline differences, propensity score matching (1:10) and inverse probability weighting combined with Firth’s penalized logistic regression were applied. Odds ratios with 95% confidence intervals were calculated.

Results: POAF developed in 174 patients within 24–48 hours postoperatively, compared with 391,329 controls. Older age, ischemic heart disease, diabetes, and prior stroke were associated with increased odds of POAF, although significance diminished after multivariable adjustment. Weighted regression confirmed these findings with narrower confidence intervals. Higher POAF risk was observed after laparoscopic pancreatectomy, hepatectomy, rectopexy, synovectomy, and gastrectomy. Total knee replacement was the most common procedure among POAF cases, representing 22% of cases and a fourfold increased risk.

Conclusions: Advanced age and cardiovascular co-morbidities were associated with increased POAF risk after NCS, although attenuated after adjustment. Consistent findings across statistical models support the robustness of the results. Targeted monitoring in high-risk patients may improve postoperative outcomes.

Background: During an influenza pandemic, clinicians need easily available clinical and laboratory criteria to distinguish influenza from similar respiratory illnesses. We compared A/H1N1/2009-polymerase chain reaction (PCR)-positive and matched PCR-negative hospitalized patients with suspected H1N1 influenza to identify factors that could assist physicians at patient admission.

Objectives: To identify factors significantly associated with A/H1N1/2009 infection.

Methods: A group of 145 patients with PCR-confirmed A/H1N1 2009 influenza admitted between 27 May 2009 and 3 December 2009 was matched with 145 PCR-negative patients by age, epidemiological week and pregnancy status. Epidemiological and clinical parameters and radiological findings on initial chest X-ray were compared between the two groups.

Results: Asthma (PCR+ 26%, PCR- 12%, P = 0.006) and military service (PCR+ 13%, PCR- 4%, P = 0.15) were associated with PCR-positive status in non-pregnant patients. At presentation, fever, cough, myalgia and fulfilling the pandemic influenza case definition were significantly more frequent in non-pregnant PCR+ patients (62/90/43/59% in PCR+ versus 38/69/30/35% in PCR-). In pregnant patients, fever and fulfilling the case definition were significantly associated with PCR-positive status. Mean leukocyte and absolute lymphocyte counts were significantly lower in both pregnant and non-pregnant PCR-positive patients. Significantly more PCR-negative non-pregnant patients (43% vs. 22% PCR+, P = 0.004) had abnormal chest X-ray (CXR) findings on presentation. In PCR-positive patients, patchy consolidation and interstitial infiltrates were the most common abnormalities.

Conclusions: Under the conditions generated by the A/H1N1/2009 pandemic, radiological findings did not distinguish reliably between influenza and other febrile respiratory illnesses. Asthma, military service, the pandemic case definition (particularly fever, cough and myalgia) and lymphopenia were associated with confirmed H1N1 infection.