The American Journal of Medical Sciences and Pharmaceutical Research
90
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TYPE
Original Research
PAGE NO.
90-92
10.37547/tajmspr/Volume07Issue03-12
OPEN ACCESS
SUBMITED
25 January 2025
ACCEPTED
24 February 2025
PUBLISHED
23 March 2025
VOLUME
Vol.07 Issue03 2025
CITATION
S.N. Gulomitdinov, & M.M. Bakhadirkhanov. (2025). Risk factors and
predictive markers of postoperative stroke following coronary artery
bypass surgery. The American Journal of Medical Sciences and
Pharmaceutical Research, 7(03), 90
–
92.
https://doi.org/10.37547/tajmspr/Volume07Issue03-12
COPYRIGHT
© 2025 Original content from this work may be used under the terms
of the creative commons attributes 4.0 License.
Risk factors and predictive
markers of postoperative
stroke following coronary
artery bypass surgery
S.N. Gulomitdinov
Republican Scientific Center for Emergency Medical Care, Uzbekistan
M.M. Bakhadirkhanov
Republican Scientific Center for Emergency Medical Care, Uzbekistan
Abstract:
Postoperative stroke remains one of the most
serious complications following coronary artery bypass
grafting (CABG), contributing significantly to increased
mortality, prolonged hospitalization, and long-term
disability. Despite improvements in surgical techniques
and perioperative care, identifying patients at risk of
postoperative stroke remains a clinical challenge.
This study aims to evaluate the key clinical and surgical
predictors associated with the development of ischemic
stroke in patients undergoing CABG, with a focus on
identifying modifiable risk factors and predictive
markers.
A retrospective analysis was conducted on patients who
underwent CABG over a two-year period. Variables
assessed
included
age,
comorbid
conditions
(hypertension, diabetes mellitus, atrial fibrillation),
carotid artery disease, duration of cardiopulmonary
bypass (CPB), intraoperative hemodynamic instability,
and cerebral perfusion strategies. Statistical methods
were employed to determine the significance of
associations between these factors and stroke
occurrence.
Advanced
age
over
70
years,
pre-existing
cerebrovascular disease, prolonged CPB time over 120
minutes, poorly controlled diabetes, and intraoperative
hypotension were identified as independent predictors
of postoperative stroke. Carotid artery stenosis and
atrial fibrillation also significantly increased stroke risk.
A high comorbidity index and prolonged aortic cross-
clamping were associated with worse neurological
The American Journal of Medical Sciences and Pharmaceutical Research
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The American Journal of Medical Sciences and Pharmaceutical Research
outcomes. Early identification of high-risk patients was
found to improve decision-making in terms of surgical
planning and perioperative management.
Postoperative stroke after CABG is influenced by a
combination of patient-related, surgical, and
hemodynamic
factors.
A
comprehensive
risk
assessment protocol incorporating both clinical and
procedural markers is essential for prevention.
Tailoring surgical and anesthetic strategies based on
individual risk profiles may reduce the incidence and
severity of neurologic complications.
Keywords:
Coronary
artery
bypass
grafting,
postoperative stroke, risk factors, ischemic stroke,
predictive markers, cardiopulmonary bypass, aortic
cross-clamping,
cerebrovascular
disease,
comorbidities, intraoperative management.
Introduction:
Postoperative stroke is one of the most
severe complications associated with coronary artery
bypass grafting (CABG). It is linked with increased
hospital stays, long-term disability, and elevated
mortality rates. Despite significant advances in cardiac
surgical techniques and perioperative monitoring, the
risk of ischemic events remains a prominent concern.
Studies report stroke incidence in CABG patients
ranging from 1.5% to 5% depending on age,
comorbidities, and intraoperative conditions (Bucerius
et al., 2003; Stamou et al., 2016) [1, 2].
Elderly patients are particularly vulnerable due to
preexisting cerebrovascular disease, atherosclerotic
changes, and reduced cerebral autoregulation.
Goldstein et al. (2011) demonstrated that patients
above 70 years have a significantly higher risk of stroke
after CABG [3]. Comorbidities such as hypertension,
diabetes mellitus, and atrial fibrillation are widely
recognized as contributing factors. Carotid artery
stenosis, even when asymptomatic, has been linked to
increased perioperative stroke rates (Whitlock et al.,
2018) [4].
Intraoperative
factors
such
as
prolonged
cardiopulmonary bypass (CPB) time, typically beyond
120 minutes, have been consistently associated with
increased neurologic events (Gaudino et al., 2021) [5].
Hemodynamic instability, including hypotension and
perfusion mismatches, can result in cerebral
hypoperfusion and microembolic damage. In
particular, aortic manipulation during CPB can lead to
plaque dislodgement and embolism, causing ischemic
stroke.
Temperature management strategies such as
moderate hypothermia during surgery have shown
neuroprotective benefits by reducing cerebral
metabolic demands. However, rewarming must be
carefully controlled as rapid or excessive rewarming can
cause cerebral hyperthermia and edema, potentially
worsening neurologic outcomes (Johnson et al., 2020;
Mohr et al., 2013) [6, 7].
Pharmacologic management also plays a critical role.
Beta-blockers reduce sympathetic tone and the risk of
arrhythmia but have been associated in some studies
with a paradoxical increase in stroke risk when not
properly titrated (Lamy et al., 2016) [8]. Anticoagulants
such as heparin, although essential during CPB, may
pose a risk for hemorrhagic transformation, particularly
in elderly or high-risk patients (Lee & Kim, 2019) [9].
Insulin therapy in diabetic and non-diabetic patients has
shown benefits in reducing deep sternal infections and
postoperative ischemia, but tight glucose control is
essential to avoid hypoglycemic episodes that may also
impact neurologic function.
Early identification of at-risk individuals using risk
stratification tools and targeted imaging, such as carotid
Doppler ultrasonography and preoperative brain
imaging, has been shown to improve clinical outcomes.
Tailoring the surgical strategy and optimizing
perioperative monitoring, including cerebral oximetry,
can reduce the incidence and severity of neurologic
complications.
CONCLUSION
In conclusion, postoperative stroke following CABG is a
multifactorial event driven by patient-specific, surgical,
and systemic factors. Elderly patients and those with
multiple comorbidities are particularly at risk. Careful
preoperative evaluation, intraoperative precision, and
evidence-based pharmacologic strategies are essential
in minimizing neurologic injury and improving patient
outcomes.
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