Randomized Trial of a Tailored Exercise Protocol Versus Standard Cardiac Rehab for Reversing Microvascular Dysfunction Post-Stent

Q: What are the key findings of this study?

A tailored exercise protocol increased coronary flow reserve compared to standard cardiac rehabilitation over 12 months.

Q: What is the clinical evidence from this study?

Study design: RCT. Population: Coronary microvascular dysfunction following percutaneous coronary intervention (PCI) (n=100). Intervention: Tailored exercise protocol vs. Standard cardiac rehabilitation (moderate-intensity aerobic exercise 3x/week for ~40 minutes/session). Primary outcome: Change in coronary flow reserve (CFR) from baseline to 12 months (MD 0.40, 95% CI 0.31 to 0.49, p=<0.001).

Q: What does this research mean for the field?

A tailored exercise protocol produces significantly greater improvements in coronary flow reserve and microvascular function compared to standard cardiac rehabilitation in post-PCI patients. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Q: What question did this study set out to answer?

To compare the effects of an individualized, tailored exercise protocol versus standard cardiac rehabilitation on coronary microvascular function in patients with persistent dysfunction following percutaneous coronary intervention.

Muhsin Zia Muhammad; Serish Fatima; Humzah Syed Kahlid; Muhammad Akram; Ehab Noori Ahmed Tlala; Neehal Shahid

doi:10.61919/dcnw5055

March 15, 2026Journal of Health Wellness and Community ResearchOpen Access

Randomized Trial of a Tailored Exercise Protocol Versus Standard Cardiac Rehab for Reversing Microvascular Dysfunction Post-Stent

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Key result

Tailored exercise protocol boosts coronary flow reserve by ~0.40 over standard rehab.

MD +0.40
95% CI 0.31 to 0.49
P<0.001
n=100

Why the study?

Coronary microvascular dysfunction may persist after successful PCI and contribute to incomplete physiological and functional recovery, and individualized exercise rehabilitation may offer greater benefit than conventional rehabilitation.

Does a tailored, physiology-informed exercise rehabilitation protocol improve coronary flow reserve compared to standard cardiac rehabilitation in patients with coronary microvascular dysfunction following percutaneous coronary intervention?

Key Points

To compare the effects of an individualized, tailored exercise protocol versus standard cardiac rehabilitation on coronary microvascular function in patients with persistent dysfunction following percutaneous coronary intervention.
Two-arm randomized controlled trial conducted at a tertiary care hospital in Lahore, Pakistan, enrolling 100 post-PCI patients with documented coronary microvascular dysfunction.
Participants were randomized 1:1 to either tailored exercise (n=50) or standard cardiac rehabilitation (n=50) and followed for 12 months with repeated-measures intention-to-treat analyses.
Coronary flow reserve increased by +0.76 ± 0.24 in the tailored exercise group compared with +0.36 ± 0.22 in the standard group, representing a between-group difference of +0.40 (95% CI 0.31 to 0.49; p<0.001).
Index of microcirculatory resistance decreased by −8.5 ± 3.7 in the tailored group versus −4.6 ± 3.1 in the standard group, yielding a between-group difference of −3.90 units (95% CI −5.26 to −2.54; p<0.001).
Tailored exercise also produced greater improvements in VO₂peak (between-group difference 3.30 mL/kg/min; 95% CI 1.87 to 4.73; p<0.001) and flow-mediated dilation (difference 1.80 percentage points; 95% CI 1.38 to 2.22; p<0.001), with no major adverse events reported.

Study Design

Type

RCT (n=100)

Blinding

Open-label

Randomization

1:1 ratio using a computer-generated random allocation sequence

Multicenter

No

Structured PICO

Does a tailored, physiology-informed exercise rehabilitation protocol improve coronary flow reserve compared to standard cardiac rehabilitation in patients with coronary microvascular dysfunction following percutaneous coronary intervention?

P

Population

100 post-PCI adults aged 40-75 years (mean age 61.1 years, 27% female) with documented coronary microvascular dysfunction (CFR <=2.5 or IMR >=25) and LVEF >=45%, followed for 12 months at a single center in Pakistan.

I

Intervention

Tailored, supervised exercise program (n=50) over 12 months, individualized according to baseline cardiopulmonary exercise capacity and coronary physiological findings: aerobic exercise (treadmill, cycle ergometer, or brisk walking) 3 times/week at 60–80% of measured VO₂peak (progressively modified), plus resistance exercise targeting major muscle groups twice weekly at 50–60% of 1-repetition maximum, and counseling on habitual physical activity, dietary optimization, and stress management, added to guideline-directed medical therapy.

C

Comparator

Standard institutional cardiac rehabilitation program (n=50) over 12 months comprising moderate-intensity aerobic exercise (predominantly walking or stationary cycling) 3 times/week for approximately 40 minutes per session without individualized adjustment based on microvascular indices and without resistance training, added to guideline-directed medical therapy (antiplatelet agents, statins, beta-blockers, and ACE inhibitors or ARBs).

O

Outcome

Change in coronary flow reserve (CFR) from baseline to 12 monthssurrogate

Main Result

Mean Difference: 0.4 (95% CI 0.31–0.49)

Absolute Event Rate: 0.76% vs 0.36%

p-value: p=<0.001

In patients with coronary microvascular dysfunction post-PCI, a tailored exercise protocol combining individualized aerobic training, resistance exercise, and lifestyle counseling significantly improved coronary microvascular function (CFR and IMR), cardiorespiratory fitness, endothelial function, and quality of life over 12 months compared to standard cardiac rehabilitation.

Limitations

Single tertiary care center with a modest sample size, limiting generalizability
Lack of participant and therapist blinding, and unclear blinding of outcome assessors
Intervention and control groups were not matched for all components (tailored group included resistance training and lifestyle counseling)
Absence of reported 6-month outcome data despite planned assessment
Detailed adherence and exercise-dose data were not presented
Not designed or powered to evaluate major clinical cardiovascular events
Formal mediation analysis was not performed to prove that changes in nitric oxide or inflammation directly mediated the improvement in coronary microvascular function.
The intervention differed from standard rehabilitation in several respects beyond personalization alone (including resistance exercise and counseling on physical activity, diet, and stress management), demonstrating the effect of a comprehensive package rather than isolating the independent effect of physiological tailoring.

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Implication

Tailored exercise may enhance microvascular function post-PCI; extends randomized evidence on rehabilitation effects on coronary flow reserve.

Abstract

Background: Coronary microvascular dysfunction may persist after successful percutaneous coronary intervention (PCI) and contribute to incomplete physiological and functional recovery. Individualized exercise rehabilitation may provide greater benefit than conventional rehabilitation. Objective: To compare the effects of a tailored exercise protocol with standard cardiac rehabilitation on coronary microvascular function after PCI. Methods: This two-arm randomized controlled trial included 100 post-PCI patients with documented coronary microvascular dysfunction at a tertiary care hospital in Lahore, Pakistan. Participants were randomized to tailored exercise (n=50) or standard cardiac rehabilitation (n=50) and followed for 12 months. The primary outcome was change in coronary flow reserve (CFR); secondary outcomes included index of microcirculatory resistance (IMR), VO₂peak, flow-mediated dilation (FMD), biochemical markers, and health-related quality of life. Longitudinal outcomes were analyzed using repeated-measures methods with intention-to-treat analysis. Results: CFR increased by 0.76 ± 0.24 in the tailored group versus 0.36 ± 0.22 in controls, yielding a between-group difference of 0.40 (95% CI 0.31–0.49; p<0.001). IMR decreased by 8.5 ± 3.7 versus 4.6 ± 3.1, respectively, with a between-group difference of −3.90 (95% CI −5.26 to −2.54; p<0.001). Greater improvements were also observed in VO₂peak, FMD, nitric oxide, hs-CRP, and physical and emotional quality-of-life domains. No major adverse events were reported. Conclusion: Tailored rehabilitation was associated with greater improvement in coronary microvascular, functional, endothelial, and selected patient-reported outcomes than standard rehabilitation over 12 months

Discussion

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Cite This Study

Muhammad et al. (2026) conducted an RCT in Coronary microvascular dysfunction following percutaneous coronary intervention (PCI) (n=100). Tailored exercise protocol vs. Standard cardiac rehabilitation (moderate-intensity aerobic exercise 3x/week for ~40 minutes/session) was evaluated on Change in coronary flow reserve (CFR) from baseline to 12 months (MD 0.40, 95% CI 0.31 to 0.49, p=<0.001). A tailored exercise protocol increased coronary flow reserve compared to standard cardiac rehabilitation over 12 months.

synapsesocial.com/papers/6af0db863c845ca7837cecf1 https://doi.org/10.61919/dcnw5055

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Randomized Trial of a Tailored Exercise Protocol Versus Standard Cardiac Rehab for Reversing Microvascular Dysfunction Post-Stent

Key Points

Study Design

Structured PICO

Main Result

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Randomized Trial of a Tailored Exercise Protocol Versus Standard Cardiac Rehab for Reversing Microvascular Dysfunction Post-Stent

Key Points

Study Design

Structured PICO

Main Result

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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