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Risk factors for adverse cardiac events in hip fracture patients: an analysis of NSQIP data

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Abstract

Purpose

Cardiovascular complications constitute morbidity and mortality for hip fracture patients. Relatively little data exist exploring risk factors for post-operative complications. Using the American College of Surgeons National Surgical Quality Improvement (ACS-NSQIP) database, we identified significant risk factors associated with adverse cardiac events in hip fracture patients and provide recommendations for practising orthopaedists.

Methods

A cohort of 27,441 patients with hip fractures from 2006 to 2013 was identified using Current Procedural Terminology codes. Cardiac complications were defined as cardiac arrests or myocardial infarctions occurring within 30 days after surgery. Bivariate analysis was run on over 30 patient and surgical factors to determine significant associations with cardiac events. Multivariate logistical analysis was then performed to determine risk factors most predictive for cardiac events.

Results

Of the 27,441 hip fracture patients, 594 (2.2 %) had cardiac complications within 30 days post-operatively. There was no significant association with respect to type of hip fracture surgery and adverse cardiac event rates (p = 0.545). After multivariate analysis, dialysis use (OR: 2.22, p = 0.026), and histories of peripheral vascular disease (OR: 2.11, p = 0.016), stroke (OR: 1.83, p = 0.009), COPD (OR: 1.69, p = 0.014), and cardiac disease (OR: 1.55, p = 0.017) were significantly predictive of post-operative cardiac events in all hip fracture patients.

Conclusion

Orthopaedic trauma surgeons should be aware of cardiac disease history and atherosclerotic conditions (PVD, stroke) in risk stratifying patients to prevent cardiac complications. Our recommendations to reduce cardiac events include simple pre-operative lab-work to full-fledged cardiac work-up and referrals to specific medicine disciplines based on the specific risk factors present.

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Conflicts of interest

Author William Obremskey has previously consulted for biometrics, done expert testimony in legal matters, has a grant from the Department of Defense, and has been a Board Member of the OTA and SEFC.

The remaining authors have no competing interests to declare.

Ethical review committee statement and approval

This study was performed in accordance with the relevant regulations of the US Health Insurance Portability and Accountability Act (HIPAA) and the ethical standards of the 1964 Declaration of Helsinki. The protocol was approved by the Vanderbilt Institutional Review Board.

This study used no previously copyrighted materials or signed patient consent forms.

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Corresponding author

Correspondence to Manish K. Sethi.

Appendix: Patient factors included in analysis

Appendix: Patient factors included in analysis

Patient demographics

Age (>65 years vs <65 years), gender (male vs. female), and race (Caucasian, African American, Asian, other)

Preoperative patient comorbidities

History of chronic obstructive pulmonary disease (COPD), diabetes, cigarette use, ventilator use, ascites, disseminated cancer, wound infections, steroid use, weight loss, bleeding disorder, alcohol use, pneumonia, varices, hypertension requiring medications, peripheral vascular disease (PVD), rest pain as a result of peripheral vascular occlusion, renal failure, dialysis use, altered sensorium, coma, hemiplegia, paraplegia, quadriplegia, transient ischemic attack (TIA), cerebral vascular accident (CVA), CNS tumour, transfusion, radiation therapy, chemotherapy, dyspnea, and sepsis

Surgical factors

ASA score (1–2 vs 3–4), type of anaesthesia (general vs. other), do not resuscitate (DNR) status, operation within the previous 30 days, and whether the case was deemed emergent (based on timing of between operation and diagnosis reported by the surgeon which usually occurred within 48 h of hospitalization)

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Sathiyakumar, V., Avilucea, F.R., Whiting, P.S. et al. Risk factors for adverse cardiac events in hip fracture patients: an analysis of NSQIP data. International Orthopaedics (SICOT) 40, 439–445 (2016). https://doi.org/10.1007/s00264-015-2832-5

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  • DOI: https://doi.org/10.1007/s00264-015-2832-5

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