Active surveillance for cardiac complications after major noncardiac surgery: implications on resource utilization and safety in high-risk patients
Authors: Pargger M , Puelacher C , Gualandro D , Glarner N , Burri K , Hure G , Bolliger D , Steiner L , Lampart A , Hammerer-Lercher A , Mueller C 
Published: October 2024

Abstract

Background
The 2022 ESC guidelines on cardiovascular assessment and management of patients undergoing noncardiac surgery recommend that high-risk patients should undergo active surveillance for cardiac complications, including perioperative myocardial infarction/injury (PMI), following major noncardiac surgery. Unfortunately, little is known about the resource use and safety of active surveillance compared to a control cohort (i.e. without active surveillance).

Objective
To quantify the impact of active surveillance for cardiac complications, by perioperative cardiac troponin (cTn) measurements and a systematic PMI work-up on working days, on resource usage and safety.

Methods
We did a retrospective comparison of non-randomised pre- vs post-implementation of an active surveillance program for cardiac complications in patients at elevated cardiovascular risk undergoing noncardiac surgery at two hospitals in Switzerland. The two cohorts' resource use and safety were compared. Resource use encompassed perioperative cTn measurements, ECGs, cardiac imaging, cardiology consultations as well as coronary angiography (CAG) and revascularisation procedures. Safety was assessed based on the number of "seemingly normal CAG" and complications arising from CAG and revascularisation procedures.

Results
A total of 13’147 patients, 10’346 in the active surveillance cohort and 2’805 in the standard-of-care (SOC) cohort, were eligible for this analysis. Patient characteristics between both cohorts were comparable (e.g. median age of 74 vs 73 and 44.8% vs 43% female, respectively). Patients in the active surveillance cohort underwent significantly more perioperative cTn measurements (86.4% vs 3.5%, respectively), postoperative ECGs (13.5% vs 5.7%), postoperative cardiac consultations (5.9% vs 2.4%), postoperative transthoracic echocardiogram (TTE) (7.5% vs 6.1%), postoperative myocardial perfusion imaging (MPI) (1.2% vs 0.6%), and postoperative CAG (0.8% vs 0.4%, all p &lt;0.05). The increased resource use led to a substantial increase in detected cardiac complications within the first 48h after surgery: active surveillance 1’207 (12%) (95%CI 11%-12%) vs SOC 68 (2.4%) (95%CI 1.9%-3.1%). The active surveillance cohort generated an overall cardiac management cost of 236 Euros (95%CI 223–250) per patient vs 133 Euros (95%CI 110–160) per patient in the SOC cohort, resulting in an incremental cost for the active surveillance of 103 Euros (95%CI 110–160) per patient. Thereby the cost of detecting one additional cardiac complication within 48h was 989 Euros. Concerning safety, no significant differences in the number of "seemingly normal CAG" (6.4% vs 15%, p=0.1) and complications due to CAG and revascularisation (0.6% vs 5.1%, p=0.08) were observed.

Conclusion
The active surveillance for cardiac complications is safe when compared to a standard-of-care cohort while 989 Euros per additional detected cardiac complication seems reasonably priced.Resource-utilization tableOverview