16. AngioClub: A Nightmare in the Left Main: Atherectomy, Perforation, and Bailout

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CathMasters (Drs. Amit Goyal, Daniel Ambinder, and Nazli Okumus), with guests Drs. Mina Fares, Fariyal Cheema, and Jeremy Langrish discuss the management of an unprotected distal left main (LM) percutaneous coronary intervention (PCI) complicated by an Ellis grade III coronary perforation. An 88-year-old man presented with a non–ST-elevation myocardial infarction (NSTEMI), heavily calcified critical distal LM disease (culprit), and a chronic total occlusion (CTO) of the right coronary artery (RCA). The team walks through heart-team decision-making for palliative-intent LM PCI, the choice to forgo upfront mechanical circulatory support (MCS), rotational atherectomy and intravascular ultrasound (IVUS)–guided calcium modification, a provisional LM-to-left anterior descending (LAD) stent strategy, and the real-time, stepwise rescue of a large perforation — balloon tamponade, pericardiocentesis with autotransfusion, and a covered stent landed at the LAD ostium to spare the circumflex.

CathMasters is for educational purposes only.

CathMasters is for educational purposes only. Music by Elijah K from Pixabay

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Pearls

  1. “ST elevation in aVR” is a barometer of global distress, not a culprit locator. aVR ST elevation with diffuse ST depression signals left main/three-vessel disease or circumferential subendocardial supply–demand mismatch; only roughly 10–25% of such patients have an acute thrombotic occlusion. In this case, the changes resolved once pain/hemodynamics normalized.
  2. After CHIP-BCIS3, mechanical support is a selective — not reflexive — decision. In complex high-risk PCI with ejection fraction ≤35%, routine elective left-ventricular unloading with a microaxial flow pump did not improve the composite outcome and showed a signal toward higher cardiovascular death. A hemodynamically stable patient with preserved EF, as here, generally does not warrant upfront support — and a 14-French femoral sheath carries real risk in a frail 88-year-old.
  3. “The last 5% can guarantee you a 100% complication.” For a disease-free, favorably angulated circumflex ostium (Medina 1,1,0), the stepwise provisional single-stent LM-to-LAD strategy is the default and reduces target-lesion revascularization compared with upfront two-stent approaches. Define the procedural goal first — here, symptom relief, not survival — which justified leaving the RCA CTO untouched.
  4. Ellis III perforation: tamponade buys time, the covered stent provides the definitive seal — and post-dilation is mandatory. Immediate balloon inflation at/across the perforation stabilizes the patient while the team mobilizes; a polytetrafluoroethylene/polyurethane covered stent seals large-vessel perforation, but residual “endoleak” around the stent is common and must be addressed with high-pressure post-dilation before reaching for a second stent.
  5. In a left main bifurcation perforation, land the covered stent at the LAD ostium to spare the circumflex — and manage the bleed in parallel. Deliberately avoiding the distal LM/circumflex preserves flow and allows full wall apposition; keep an LM-sized covered stent on standby as bailout. Pericardiocentesis with autotransfusion (cell saver) is salvage therapy for hemorrhagic tamponade — heparinize each collection bag (10,000 units) so the perfusionist can re-infuse the patient’s own blood.

Notes

1. How should the high-risk ECG pattern of aVR ST elevation with diffuse ST depression be interpreted?

  • The pattern reflects a net ST vector toward aVR from widespread subendocardial injury; it is associated with left main or three-vessel disease and increased mortality, but has only ~10–14% positive predictive value for acute occlusive myocardial infarction.
  • Broad differential includes nonocclusive coronary disease and demand/supply mismatch (hypotension, sepsis, severe anemia, aortic stenosis) and repolarization abnormalities; resolution with pain relief or hemodynamic correction argues against acute occlusion.
  • In this NSTEMI presentation, the pattern correctly flagged critical distal LM disease as the culprit, confirmed angiographically.

2. How does the heart team frame revascularization in a frail elderly patient with complex disease?

  • The intent was explicitly palliative — symptom relief rather than prognostic gain — which removed the RCA CTO from consideration and focused treatment on the LM.
  • The patient was deemed a non-surgical candidate; after continued angina despite optimal medical therapy, the multidisciplinary team, patient, and family accepted PCI with a frankly stated 5–10% risk of a serious periprocedural complication.
  • Procedural planning emphasized “planning for success”: daytime timing, a full team brief, and preparation for complex PCI with calcium-modification algorithms available.
  • Shared-decision making with the patient and their family guided by their own goals is paramount in these complex cases.

3. When is mechanical circulatory support indicated for high-risk PCI?

  • CHIP-BCIS3 randomized 300 patients with complex disease and EF ≤35% to elective microaxial flow pump (Impella CP) versus standard care; routine unloading did not improve the hierarchical composite outcome and trended toward higher cardiovascular death.
  • A CHIP-BCIS3 hemodynamic substudy showed the pump reduced inotrope use but increased loss of pulse pressure and did not prevent myocardial stunning.
  • Randomized evidence does not support routine MCS outside cardiogenic shock; selection should weigh EF, baseline blood pressure, lesion predictability, and access risk. This patient — stable, normal biventricular function — had PCI without upfront support, with femoral access and bailout strategies kept in mind.
  • Enjoy CathMastes Ep 4 (Data to Delivery: CHIP-BCIS3 — Microaxial Flow Pump Support for High-Risk Complex PCI with Dr. Saraschandra Vallabhajosyula) to learn more about CHIP-BCIS3.

4. How is heavily calcified left main disease modified and assessed?

  • Left main atherectomy can be performed from the radial or femoral artery. Adequate support and appropriate guide selection are key. In this case, the setup was: right radial, 7.5-French sheathless guide for maximal support; workhorse wire and microcatheter exchanged for a dedicated 0.009-inch rotational wire; upfront rotational atherectomy chosen because the stenosis was too tight to safely balloon or image first.
  • Burr selection: aim for a burr-to-artery ratio of ~0.5–0.6; a relatively larger burr (here 1.75 mm) can be chosen when debulking nodular calcium rather than simply creating a channel. Note: the recording’s “no more than two-thirds” rule of thumb is more liberal than the published 0.5–0.6 ratio.
  • Technique: rotational speed ~160,000 rpm (within the safe 135,000–180,000 rpm range), short runs of 10–15 seconds (≤30 s) with a pecking motion and rest between runs, avoiding decelerations >5,000 rpm.
  • No-reflow prevention: continuous flush of heparinized saline with verapamil and nitroglycerin in the bag or vasodilators through the manifold between runs; left-sided atherectomy rarely needs temporary pacing, so pacing wires were abandoned for LM cases (a small atropine dose is used for large dominant RCA atherectomy instead). Aminophylline pre-treatment can also mitigate atherectomy-related bradyarrhythmias.
  • IVUS findings guided the plan: distal LM was the tightest concentric calcium with fractures at 2, 7, and 11 o’clock; ostial LAD showed nodular calcium (a difficult subset with no single effective device); landing zones measured ~4.0 mm (proximal LAD) and ~5.0 mm (LM body). A 1:1 (4.0 mm) non-compliant balloon confirmed good expansion before stenting.

5. Why a provisional single-stent strategy for the distal left main bifurcation?

  • In this case, the circumflex ostium was widely patent with a favorable (~90°) take-off (Medina 1,1,0), so side-branch compromise risk was low; it was protected with a jailed wire.
  • EBC MAIN established the stepwise provisional approach as the default for true LM bifurcation disease, with lower target-lesion revascularization and comparable death/MI versus upfront two-stent strategies, especially for smaller/shorter side branches.
  • Stent selected by IVUS: 4.0 × 28 mm drug-eluting stent capable of expansion to 5.0 mm in the LM body.

6. How is an Ellis grade III perforation recognized and managed step by step?

  • Recognition: during non-compliant balloon inflation, the patient developed chest pain, hypotension (110/70 to 80/50 mmHg), and tachycardia; angiography showed frank contrast extravasation (Ellis III) with an uncertain LM-versus-LAD source. Sharp pain during balloon/stent work should always raise suspicion.
  • First step — balloon tamponade: the 4.0 mm balloon already in the guide was readvanced into the LM and inflated to stop bleeding and buy thinking time; note this occludes the only remaining vessel (RCA CTO), so inflations had to be intermittent to allow perfusion.
  • Reduce cognitive load and mobilize the team in parallel: alert the cath-lab staff, call a colleague from the adjacent lab, and involve intensive care for airway/hemodynamic support while the operator focuses on source control.
  • A drug-eluting stent (4.0 × 28 mm) was deployed LAD-to-LM in the hope a flap would seal the channel; but bleeding continued.
  • Hemorrhagic tamponade management: pericardial drain with autotransfusion via cell saver (~1,500 mL aspirated over the case), large-bore femoral venous access for volume/blood, and successful resuscitation from a brief pulseless electrical activity arrest. Heparinize each autotransfusion collection bag (10,000 units).
  • Definitive seal: a PK Papyrus covered stent (3.5 mm) was landed precisely at the LAD ostium — deliberately sparing the distal LM and circumflex to preserve flow and achieve wall apposition. Residual leak was addressed with high-pressure post-dilation using a 4.0 mm non-compliant balloon; repeat angiography confirmed no further leak and drain output fell. Covered stents are the primary emergency treatment for large-vessel perforation.
  • Bailout thinking: an LM-sized covered stent was on standby in case of upstream leak, accepting circumflex occlusion; limited covered-stent expandability and vessel-size mismatch make LM covered-stenting challenging.
  • Anticoagulation: a reasonable activated clotting time was maintained while equipment remained in the coronaries (two stent layers, ongoing manipulation); reversal is considered only after equipment is removed with ongoing leak and no planned further intervention. Here heparin was not reversed because source control was achieved — reversal/protamine is used more commonly after wire-perforation coiling, where thrombus (not the coil) seals the hole.
  • Finish: final IVUS confirmed well-apposed, well-expanded stents from LAD to LM. The patient recovered over the following days with a good angiographic result and no need for staged re-intervention.

References

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