Comparison of impact on death and critical care admission of acute kidney injury between common medical and surgical diagnoses

Acute kidney injury risk in orthopaedic trauma patients pre and post surgery using a biomarker algorithm and clinical risk score

Acute kidney injury (AKI) after major trauma is associated with increased mortality. The aim of this study was to assess if measurement of blood biomarkers in combination with clinical characteristics could be used to develop a tool to assist clinicians in identifying which orthopaedic trauma patients are at risk of AKI. This is a prospective study of 237 orthopaedic trauma patients who were consecutively scheduled for open reduction and internal fixation of their fracture between May 2012 and August 2013. Clinical characteristics were recorded, and 28 biomarkers were analysed in patient blood samples. Post operatively a combination of H-FABP, sTNFR1 and MK had the highest predictive ability to identify patients at risk of developing AKI (AUROC 0.885). Three clinical characteristics; age, dementia and hypertension were identified in the orthopaedic trauma patients as potential risks for the development of AKI. Combining biomarker data with clinical characteristics allowed us to develop a proactive AKI clinical tool, which grouped patients into four risk categories that were associated with a clinical management regime that impacted patient care, management, length of hospital stay, and efficient use of hospital resources.

Factors associated with the development of acute general surgical pathology in medical in-patients

BACKGROUND

Medical inpatients can develop acute general surgical conditions. However, this is rare. The presence of multiple acute pathologies delays diagnosis and these patients have poorer prognoses.

AIM

To determine the incidence, risk factors and prognosis of medical inpatients developing acute general surgical conditions.

METHODS

A single-centre retrospective case-control study was conducted over one year in the United Kingdom. Medical patients developing acute surgical pathology were identified using the local referral system. For each case, two controls were selected from a pool of medical in-patients receiving no general surgical input during their admission. Patient records were used to collect hospital admission details, demographic and laboratory data. Univariate analysis and multi-variable analysis were performed.

RESULTS

The study included 42 cases and 84 controls. The incidence of general surgical pathology in medical in-patients was 2.3/1000 admissions/year. In multivariate analysis, risk factors associated with developing general surgical pathology were previous abdominal surgery (Odds Ratio [OR] =3.68, 95% Confidence interval [CI]: 1.43 to 9.48, p=0.007) and doubling from baseline creatinine (OR=18.9, 95%CI: 2.57 to 139, p=0.004). Patients with surgical pathology had longer in-patient stays (22.8 vs 9.4 days, p<0.001) and a higher inpatient mortality (23.8% vs 7.1%, p=0.011). Development of surgical pathology was strongly associated with mortality (OR=4.06, 95%CI: 1.36 to 12.1).

CONCLUSION

The development of acute surgical pathology in medical in-patients is rare but associated with longer in-patient stays and higher mortality. We have identified risk-factors associated with the development of surgical pathology which can be used to identify patients at risk of surgical pathology. This article is protected by copyright. All rights reserved.

Potential Prognostic Markers of Acute Kidney Injury in the Early Phase of Acute Pancreatitis

Acute kidney injury (AKI) is a serious complication of acute pancreatitis (AP), which occurs in up to 70% of patients with severe AP and significantly increases the risk of mortality. At present, AKI is diagnosed based on dynamic increase in serum creatinine and decreased urine output; however, there is a need for earlier and more accurate biomarkers. The aim of the study was to review current evidence on the laboratory tests that were studied as the potential biomarkers of AKI in AP. We also briefly summarized the knowledge coming from the studies including sepsis or ICU patients since severe acute pancreatitis is associated with systemic inflammation and organ failure. Serum cystatin C and serum or urine NGAL have been shown to predict or diagnose AKI in AP; however, this evidence come from the single center studies of low number of patients. Other markers, such as urinary kidney injury molecule-1, cell cycle arrest biomarkers (tissue inhibitor metalloproteinase-2 and urine insulin-like growth factor-binding protein 7), interleukin-18, liver-type fatty acid-binding protein, or calprotectin have been studied in other populations suffering from systemic inflammatory states. In AP, the potential markers of AKI may be significantly influenced by either dehydration or inflammation, and the impact of these factors may be difficult to distinguish from kidney injury. The subject of AKI complicating AP is understudied. More studies are needed, for both exploratory (to choose the best markers) and clinical (to evaluate the diagnostic accuracy of the chosen markers in real clinical settings).