What question did this study set out to answer?

This research aims to investigate the protective effects of carvedilol on myocardial injury caused by ischemia-reperfusion in rat models.

January 17, 2026

The Potential Protective Effect of Carvedilol on Induced Myocardial Ischemia-Reperfusion Injury in Rats: A Histological and Immunohistochemical Study

Q: What does this research mean for the field?

Carvedilol pretreatment significantly preserves cardiac function in rats with myocardial ischemia-reperfusion injury, reducing CK-MB and cTnI levels. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.SUPPORTS_CONSENSUS.

Key Result

Carvedilol pretreatment significantly preserved cardiac function in rats with myocardial ischemia-reperfusion injury, reducing CK-MB and cTnI levels.

Key Points

This research aims to investigate the protective effects of carvedilol on myocardial injury caused by ischemia-reperfusion in rat models.
Induced myocardial IR injury in rats for 45 min followed by 120 min of reperfusion
Administered carvedilol at 2 mg/kg/day for 7 days prior to injury induction
Assessed cardiac effects through physiological measurements and serum biomarkers
Utilized immunohistochemical techniques and microscopy for tissue analysis
Performed statistical analysis to evaluate outcomes
Carvedilol preserved cardiac function in IR-injured rats by reducing QTc and ST-segment elevations
Serum CK-MB and cTnI levels were significantly reduced following carvedilol treatment
Expression of Bax decreased while Bcl-2 increased, indicating reduced apoptosis
Histological evaluation showed mitigated necrosis and cellular degeneration
Ultrastructural integrity of myocardial tissue was preserved with maintained capillary patency

Structured PICO

Does carvedilol pretreatment reduce myocardial ischemia-reperfusion injury in a rat model?

Population

40 Wistar rats subjected to surgically induced myocardial ischemia-reperfusion (IR) injury (45 min ischemia followed by 120 min reperfusion).

Intervention

Carvedilol 2 mg/kg/day administered orally for 7 days prior to ischemia-reperfusion induction.

Comparator

Control group (no IR) and IR group (IR without carvedilol pretreatment).

Outcome

Cardiac effects assessed via physiological measurements (QTc, ST-segment, arrhythmias), serum biomarkers (CK-MB, cTnI), immunohistochemical detection (Bax, Bcl-2), and histological/ultrastructural evaluation.surrogate

Carvedilol pretreatment protects against myocardial ischemia-reperfusion injury in rats by improving electrical stability, reducing apoptosis, and preserving tissue ultrastructure.

Main Result

Absolute Event Rate: 0% vs 0%

Abstract

Abstract Reperfusion injury is a paradoxical response following ischemic heart disease that exacerbates myocardial damage, resulting in ischemia reperfusion (IR) injury. This study explored the protective effect of carvedilol (CAR) on cardiac tissue in myocardial IR injury. Forty Wistar rats were randomly allocated into control, IR, and CAR + IR groups. Myocardial IR injury was surgically induced for 45 min followed by 120 min of reperfusion. CAR (2 mg/kg/day) was administered orally for 7 days prior to IR induction. Cardiac effects were assessed via physiological measurements, serum biomarkers of creatine kinase-MB (CK-MB) and cardiac troponin I (cTnI), immunohistochemical detection of Bcl-2-associated X-protein (Bax) and B cell lymphoma 2 (Bcl-2), light and electron microscopy, histopathological grading, and morphometric and statistical analysis. CAR pretreatment markedly preserved cardiac function in IR-injured rats by significantly reducing QTc and ST-segment elevations and suppressing ventricular arrhythmias. Biochemically, serum CK-MB and cTnI levels were significantly lowered, while Bax expression decreased and Bcl-2 increased. Histologically, CAR mitigated necrosis, hemorrhage, and cellular degeneration. Ultrastructurally, myocardial integrity, capillary patency, and telocyte morphology were preserved. CAR pretreatment effectively mitigated myocardial IR injury through multifaceted mechanisms including improving cardiac electrical stability, reducing biochemical and apoptotic damage, and preserving histological and ultrastructural integrity.

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