Summary of "PCI of severe coronary calcium. Calcium modification strategies: when, what, how. Case scenarios"

Main ideas and concepts

The speaker provides an interventional cardiology overview focused on severe coronary calcium and calcium modification strategies, emphasizing:

• How to define “severe” coronary calcium (fluoroscopy and intravascular imaging)
• When calcium modification is needed vs standard PCI
• Which modality to choose among laser, rotational/orbital atherectomy, and intravascular lithotripsy (IVL/Shockwave)
• How to manage different case scenarios, including:
  • Calcified nodules
  • Stent-related calcification
  • Uncrossable/undilatable lesions
  • Dissections
  • ACS/MI settings

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Scenarios covered (as outlined in the talk)

• Define severe coronary calcium
• Decide when to perform calcium modification
• Determine whether calcium modification is needed for:
  • 360°/270° arcs of calcium
  • Calcified nodules (including eruptive vs non-eruptive)
  • Calcium with negative vessel remodeling
  • Superficial vs deep calcium
  • Minimum calcium thickness criteria (OCT-based)
• Choose among:
  • IVL (Shockwave/intravascular lithotripsy)
  • Rotational atherectomy
  • Orbital atherectomy
  • Laser atherectomy
• Additional scenario-based guidance:
  • Eccentric calcium / calcified nodules
  • Balloon uncrossable vs balloon undilatable lesions
  • Stent underexpansion (“stent regret”)
  • Calcium inside stents
  • Long calcified lesions (non-severe culprit spot but severe surrounding calcium)
  • Post–calcium-modification imaging considerations
  • Tool combinations (e.g., laser-assisted, rota + IVL)

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How to define “severe coronary calcium”

1) Fluoroscopic definition (base level)

• Severe fluoroscopic calcium:

  • Long > 50 mm calcification
  • Present on both sides of the vessel
  • Visible on still images (even without cardiac motion and before contrast injection)

• If calcium is only on one side or is only obvious on motion video (not still images):

  • Consider moderate fluoroscopic calcium (speaker’s note: “moderate” by IVIS/OCT context, with auto-caption ambiguity)

2) Intravascular imaging (IVI/OCT/IVUS) definition

Severe calcium is defined by any of the following three major imaging features (may prompt modification; not automatically mandatory):

1. Arc of calcium = 360° for any length
2. Arc of calcium > 270° over > 5 mm length
3. Calcified nodule
   • Defined as eccentric calcium protruding into the lumen (“bulge” into the lumen)

Additional features that further favor calcium modification

• Longer calcium length → worse (more likely calcium modification is needed)
• Negative vessel remodeling:
  • External elastic membrane diameter < distal external elastic membrane
  • Vessel appears “shrunk,” making stent expansion harder
• Small vessel size + negative remodeling:
  • Less wall tension from balloon inflation
  • Calcium tends to be superficial, and superficial calcium is worse for stent expansion than deep calcium
• Minimum calcium thickness > 0.5 mm (by OCT only; not reliably measured by IVUS/IVI)
• Example visualization (OCT):
  • External elastic lamina smaller proximally than distally

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Calcified nodules (major subtopic)

Core definition

• Calcified nodule = Eccentric calcium bulging/protruding into the lumen
  • Likely originates from fracture of calcified sheets

Subtypes

1. Eruptive calcified nodule

   • Bulges and ruptures the cap
   • Causes thrombus formation → associated with acute coronary syndrome
   • Associated with worse long-term outcome due to ACS
   • However, described as having better stent expansion because softer components (e.g., lipid/thrombus elements) may be present

2. Non-eruptive calcified nodule

   • Bulges but does not rupture cap
   • Bleeds at its base, then that bleed progressively calcifies
   • Described as stiffer/harder → worse stent expansion
   • More “stable” vs eruptive; less immediately thrombotic/ACS-driven

How to differentiate eruptive vs non-eruptive (per speaker)

• Typically not reliably distinguished by IVI (IVUS/auto-caption “IVIS”)—both may look similar.
• OCT differentiation:
  • Non-eruptive: thick cap around calcium without cap disruption/thrombus
  • Eruptive: cap fracture with thrombus

Imaging appearance differences on OCT vs IVUS (as described)

• General calcium sheets/plates on OCT:
  • Dark, well-demarcated, granular heterogeneous
  • Often no deep shadowing
• Calcified nodule on OCT:
  • Causes attenuation and deep shadowing
  • Not well demarcated
  • Explained by a necrotic/lipid core (and possibly thrombus/RBC) promoting fracture and bulge

Epidemiology and clinical implications

• Calcified nodules account for ~4–8% of culprit lesions but are more prevalent in heavily calcified lesions.
• More likely in:
  • Hinge points (e.g., ostial and mid RCA)
  • Regions with necrotic/lipid core
  • Areas with high lipid/necrotic core mixed with calcium (e.g., left main bifurcation, proximal coronary tree)
• After stenting, calcified nodules may show repr protrusion/regrowth inside the stent
• Named as a likely predominant cause of target lesion revascularization after PCI in calcified nodule patients

Treatment challenges specific to calcified nodules (atherectomy limitations)

• Calcified nodules:
  • Impede stent expansion
  • Are not well treated if atherectomy “shaves” in the wrong orientation
• Rotational atherectomy:
  • More effective when the rotor wire hugs the nodule (wire bias against it)
  • Non-ideal wire bias reduces effectiveness for rotational and orbital approaches
• Orbital atherectomy:
  • More successful than rotational for calcified nodules because it may modify eccentric components
  • Higher risk of perforation → use low speed and very careful/slow technique

Suggested order for calcified nodules (per speaker)

1. IVL (lithotripsy) tends to be best
2. Orbital atherectomy
3. Rotational atherectomy (especially with favorable wire bias)

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When to perform calcium modification (framework + logic)

Three questions the speaker answers

1. In severe calcium, is calcium modification required or can standard PCI work?
2. If modification is chosen, choose atherectomy (rotational/orbital/laser) vs IVL
3. If atherectomy is chosen, how to select rotational vs orbital vs laser, and when to use laser

Definite indications (direct procedural reasons)

• A) Balloon-crossable vs balloon-uncrossable

  • If balloon cannot cross → calcium modification is required (atherectomy or laser route implied)

• B) Balloon undilatable despite high pressure

  • If balloon does not fully expand on two orthogonal views despite ≥20 atm
  • Treat as an indication for calcium modification
  • Emphasis: confirm in 3D using cine shots (not single-view impression)

Imaging-based indications (IVI features)

Classic imaging scenarios that favor calcium modification include:

• Denser/thicker/longer calcium
• Multiple IVI features, not just one
• Examples:
  • >270° arc over >5 mm plus spots of 360°
  • Calcified nodule
  • Negative vessel remodeling
  • External elastic membrane diameter < 3.5 mm

Nuance: Some guidelines recommend modification if any one major IVI feature is present, but the speaker does not fully agree, citing trials showing no outcome improvement from systematic atherectomy when only one feature is present.

Trial-based perspective (as described)

• ECLIPSE trial (orbital atherectomy vs conventional balloon prep):
  • Systematic orbital atherectomy for severely calcified lesions did not improve outcomes
  • More complications and more 30-day mortality
  • Only ~5% in the conventional arm required cross-over for uncrossable/undilatable lesions
• ROTAXIS and PREPARE-CAL:
  • Rotational atherectomy also not shown to improve outcomes with systematic strategies
  • Potential trend toward more intraprocedural lumen loss
• Takeaway:
  • A single imaging feature alone may not justify routine modification
  • Stronger justification tends to be combination of features and/or procedural failure (uncrossable/undilatable)

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Modality selection: IVL vs rotational vs orbital vs laser

“Lumping” the modification options

Main calcium modification tools discussed:

• IVL (Shockwave)
• Rotational atherectomy
• Orbital atherectomy
• Laser atherectomy

Laser is described as generally inferior to other atherectomy methods, but important for specific situations.

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Procedural instruction-style comparisons (when to choose which)

A) Choose IVL (lithotripsy) when

The speaker’s main preferences include:

• Eccentric calcium or calcified nodule with bulge (IVL favored over orbital/rotational)
• Balloon crosses but the lesion does not fully dilate
• Severe tortuosity/angulation
  • Especially where atherectomy perforation risk is high
• Distal disease / long calcified segments / small vessels
  • Concern for burr entrapment with atherectomy
• Small vessels (~2.5 mm)
  • IVL favored due to safer burr-to-vessel considerations (burr size ratio risk)
• Stent-related underexpanded stent due to calcium behind the stent
  • IVL top choice, then laser, then rotational (as described)
• STEMI/NSTEMI with heavy thrombus
  • Prefer flow restoration + high-pressure ballooning
  • Avoid atherectomy acutely; IVL may be considered only if thrombus burden is acceptable (conditional approach)
• Dissection situations
  • If balloon uncrossable/disrupted plan:
    • Re-establish flow first; then consider staged atherectomy or IVL if it can cross

B) Choose Rotational atherectomy when

• Balloon uncrossable lesion
• Balloon uncrossable / microcatheter exchange difficulty
  • Rotational wire system described as helpful
• Severely angled or tortuous lesions
  • If IVL cannot cross, rotational may be favored over orbital
• Inside stent calcium
  • Speaker generally prefers laser or IVL over orbital in-stent
  • Rotational may be used in some circumstances

C) Choose Orbital atherectomy when

• Large vessels (speaker emphasizes repeatedly)
• Eccentric lesions and calcified nodules
  • Orbital can modify eccentric components even if wire bias is not ideal
• Certain balloon uncrossable and undilatable lesions
• Cautions:
  • Higher risk of perforation
  • Especially if orbiting into non-calcified segments
  • Requires low-speed, slow pecking
• Trial nuance:
  • Orbit’s advantages did not consistently translate in at least one OCT-related trial (rotational sometimes achieved better atherectomy width/expansion)

D) Choose Laser atherectomy when (explicit, limited roles)

• Underexpanded stent with calcium behind stent
  • Use laser (with contrast described) to vaporize plaque and allow expansion
• Balloon uncrossable lesions when you cannot exchange wires
  • If microcatheter cannot cross and you cannot advance an atherectomy wire:
    • Use laser advanced over any wire to soften/vaporize and facilitate later crossing/exchange

E) Combination strategies (explicit examples)

• Laser-assisted atherectomy
  • Laser first to enable later atherectomy
• Laser → IVL in some uncrossable lesion scenarios
• Rota → IVL
  • If balloon still won’t yield perfectly after rotational, and calcium still not adequately fractured on imaging
• Atherectomy → IVL
  • If calcium thickness/density makes IVL delivery difficult upfront, or if superficial vs deep fracture requires both tools

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Shockwave / IVL mechanics (instruction-style bullet summary)

• Advance IVL catheter over a 0.014” wire
• Inflate balloon to ~4–6 atm
• Activate generator to create electrical discharges
  • Vaporize fluid inside balloon → create acoustic sonic shock waves
• Sonic shock waves fracture calcified plaque superficially and deeply
• Dosing pattern described:
  • 10 pulses over ~10 seconds while balloon is inflated
  • Deflate for ≥10 seconds to reduce eschar/ischemia risk and allow recovery
  • Repeat up to 12 cycles
• Limitation:
  • Worse crossing profile/deliverability than non-compliant balloons (thicker profile)
  • Often requires pre-dilation with a high-pressure balloon
  • Sometimes requires atherectomy first if calcium is too thick/dense for IVL delivery

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Atherectomy wire/catheter and laser logistics (procedural flow)

Balloon uncrossable lesions: speaker-described atherectomy approach

• Cross with 0.014” Whisper wire
• Exchange for a rotational/orbital atherectomy wire (via microcatheter)
• If microcatheter cannot cross:
  • Place microcatheter at lesion inlet
  • Remove Whisper wire
  • Attempt direct wiring using rotational wire or orbital wire
• If you cannot wire/modify sufficiently:
  • Use laser over any wire to vaporize/soften
  • Then re-attempt microcatheter advancement and later wire exchange to proceed

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Special clinical scenario guidance

1) Severe calcified lesion with dissection during ballooning

• Major dissection (Grade C or more / extensive planes):
  • Atherectomy generally not advised
• Minor dissection (Grade A/B or limited plane not reaching media):
  • Atherectomy may be possible but with higher perforation risk
• If flow impaired:
  • Re-establish flow with further ballooning
  • Stage definitive calcium modification 4–6 weeks later

2) Heavy calcium with STEMI/NSTEMI + thrombus burden

• First: restore flow
• Prefer high pressure ballooning
• Try to avoid atherectomy acutely (microvascular compromise risk)
• IVL:
  • Generally avoid if thrombus burden is high
  • Consider IVL if thrombus burden is acceptable; otherwise stage
• Staging approach:
  • Consider returning 1–2 days later as thrombus resolves and no-reflow risk declines

3) Stent-related calcium (two types)

Type 1: Underexpanded stent with calcium behind it (“stent regret”)

• Top choice: IVL
• Then: laser
• Rotational atherectomy: described as riskier
  • Potential for burr/stent entrapment
  • Mechanism via heating/melting rather than reliable fracturing

Type 2: Calcium inside the stent

• Causes:
  • Calcified neoatheroma (often after 3+ years)
  • Instant calcium from protrusion through stent cells (can be very early)
• Preferred: IVL or laser
• Caution:
  • Orbital atherectomy has higher in-stent risk (burr stuck)

4) Long calcified lesions

• Even if the tightest culprit spot looks moderate fluoroscopically:
  • Surrounding heavy calcium may represent a calcified nodule
  • Fractured sheets may not be plainly visible
• If surrounding calcium is hemodynamically significant and needs coverage:
  • Perform calcium modification even if the culprit appears only moderate

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Post-modification imaging / endpoint concept

• Repeat OCT/IVI is suggested to assess calcium fracture (especially in 360°/270° arc areas)
• However, absence of visible fracture does not necessarily mean no further modification is needed:
  • Microfracture may have occurred
  • Vessel compliance may have improved
• If balloon still under-expands:
  • Consider additional strategy
  • Speaker suggests:
    • If you don’t see fracture, proceed with 1:1 high-pressure ballooning (after modification)
    • Ensure full expansion in two views

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Speaker/source(s) referenced

• Dr. Shin (review paper on calcified nodules and PCI outcomes; multiple mentions)
• Jack Intervention Review (context for calcified nodules work reviewed by Dr. Shen)
• ECLIPSE trial (orbital atherectomy strategy vs conventional balloon prep)
• ROTAXIS trial
• PREPARE-CAL trial
• Dr. Shen (mentioned in connection with calcified nodule regrowth/revascularization and related review)

Category

Educational

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