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He is known case of dyslipidemia, history of cag 12 yrs back s/o myocardial bridgee...now has dizziness for 2 days subsided with vertin.his pr: 54/ min bp 135/85mmhg, echo normal, ecg wnk.advice on weather to start betaboicker and on dyslipidemia control .he was intially on rosuvas 5 should it be converted to rosuvas ez

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myocardial bridge treatment beta blocker management

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myocardial bridge coronary artery management

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PMID: 34823663

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I now have enough information to give a comprehensive, evidence-based response. Let me compile it.

Clinical Assessment: Mr. Rajaram Hadawale, 58M

Lipid Profile (12/07/2026):
  • Total Cholesterol: 203 mg/dL (borderline high)
  • LDL: 134 mg/dL (borderline high - needs urgent attention given his risk profile)
  • HDL: 44 mg/dL (low normal)
  • Non-HDL: 159 mg/dL (desirable range 130-159)
  • TG: 121 mg/dL (normal)
  • Fasting Glucose: 86 mg/dL (normal)

Key Issues to Address

1. BETA-BLOCKER - Should you start one?

Answer: Exercise caution - not indicated right now, and potentially contraindicated.
Regarding myocardial bridge (MB): Beta-blockers are traditionally recommended in symptomatic MB because they reduce heart rate, prolong diastole (allowing compressed tunneled vessel to recover), and reduce contractility - all of which reduce systolic compression of the bridged segment. Per the JACC State-of-the-Art Review on MB (Sternheim et al., 2021, PMID 34823663), beta-blockers are first-line medical therapy for symptomatic MB.
However - his current HR of 54 bpm is a significant red flag:
  • A resting HR of 54/min is already bordering on bradycardia (< 60 bpm)
  • Starting a beta-blocker on a HR of 54 risks symptomatic bradycardia (HR may drop to 40s), especially since he is already experiencing dizziness (though likely labyrinthine given response to betahistine/vertin)
  • Echo is normal and ECG is within normal limits - no heart failure or reduced EF to drive beta-blocker use
Recommendation on beta-blocker:
  • Do NOT start a beta-blocker at this time given HR of 54/min
  • Verify whether the 54 bpm is his baseline resting HR or whether he has been on any rate-slowing drug
  • If the dizziness was cardiac in origin (vasovagal, sinus bradycardia), beta-blockers would be absolutely contraindicated
  • If and when beta-blocker is needed for MB symptoms (angina, ischemia), start at the very lowest dose (e.g., metoprolol succinate 12.5 mg OD) under HR monitoring
  • Ivabradine (5 mg BD) is an alternative heart rate-reducing agent that avoids negative chronotropy-related bradycardia risk and is particularly useful in MB with normal EF - worth considering if HR-reduction is clinically needed
  • Consider a 24-hour Holter to rule out sick sinus syndrome, pauses, or AV block before making any HR-modifying decision

2. DYSLIPIDEMIA MANAGEMENT - Is his LDL adequate? Should Rosuvas 5 be converted to Rosuvas-EZ?

His risk category: Very High Risk / Secondary Prevention
  • Known dyslipidemia
  • CAG 12 years back showing myocardial bridge (a structural coronary anomaly, though not atherosclerotic, places him in a monitored category)
  • Age 58, male
  • LDL currently 134 mg/dL on Rosuvastatin 5 mg
LDL target: For very high cardiovascular risk / secondary prevention, current guidelines (ACC/AHA and ESC) recommend:
  • ACC/AHA: LDL < 70 mg/dL (high-intensity statin recommended) - per Harrison's 22E
  • ESC 2019/2023: LDL < 55 mg/dL for very high risk, with ≥50% reduction from baseline
  • His current LDL of 134 is far above either target. He is on a low-intensity statin (Rosuvas 5 mg).
Step 1 - Intensify statin first: Rosuvastatin 5 mg provides approximately 30-35% LDL reduction. He needs high-intensity therapy:
  • Rosuvastatin 20-40 mg is preferred first step (high-intensity statin; reduces LDL by ~50-55%)
  • Atorvastatin 40-80 mg is the alternative
  • Per Harrison's 22E: "Current recommendations are to use high-intensity statin therapy in patients with ASCVD or deemed at high risk of ASCVD"
Step 2 - Add Ezetimibe if target not met: If after 6-8 weeks of Rosuvas 20-40 mg the LDL is still > 70 mg/dL (or > 55 if targeting ESC goal), then yes, convert to Rosuvas-EZ (Rosuvastatin + Ezetimibe 10 mg).
  • Ezetimibe adds a further 18-25% LDL reduction on top of statin (Harrison's 22E)
  • The IMPROVE-IT trial showed statin + ezetimibe combination significantly reduced major CV events vs statin alone
  • The combination is safe and well-tolerated; monitor LFTs when combining
Practical recommendation:
StepActionExpected LDL
NowUpgrade to Rosuvas 20 mg~90-100 mg/dL (est.)
At 6-8 weeksIf LDL > 70, add Ezetimibe 10 (i.e., Rosuvas-EZ)~70-75 mg/dL
If still not at goalConsider PCSK9 inhibitor referral< 55 mg/dL
Rosuvas-EZ now without dose escalation? Not ideal - it is better to first optimize rosuvastatin dose to 20 mg, then add ezetimibe if needed. Jumping to Rosuvas-EZ 5/10 would still leave him on a suboptimal statin dose.

3. OTHER CONSIDERATIONS

  • Dizziness / Vertin: The resolution with betahistine (Vertin) strongly suggests benign positional vertigo or labyrinthine etiology, not cardiac (no syncope, no HR drop noted, normal ECG/echo). Reassuring. Follow Dix-Hallpike if recurs.
  • Non-HDL 159 mg/dL: Still elevated (desirable < 130). This will improve with statin intensification.
  • HDL 44 mg/dL: Low-normal. No drug indicated for isolated low HDL currently; lifestyle (exercise, smoking cessation) is key.
  • Fasting glucose 86 mg/dL: Normal. No diabetes risk currently.
  • Lifestyle: Emphasize Mediterranean diet, regular aerobic exercise (30 min/day), avoid smoking - all lower LDL and improve HDL.

Summary Advice

IssueAction
Beta-blockerHold - HR 54/min too low; get Holter to rule out conduction disease
LDL 134 (on Rosuvas 5)Upgrade to Rosuvastatin 20 mg immediately
Rosuvas-EZ?After 6-8 weeks, if LDL still > 70, then yes - switch to Rosuvas 20/EZ 10
DizzinessLikely vestibular; reassuring with normal echo/ECG
Follow-upRepeat lipid profile in 6-8 weeks after dose change
References: Harrison's Principles of Internal Medicine 22E; Fuster & Hurst's The Heart 15th Ed; Sternheim et al. JACC 2021 - Myocardial Bridging Review (PMID 34823663)
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