Clinical Pearls & Daily Advice

Structural Heart Pearls

#001

TAVR · Sizing

Annular Area vs. Mean Diameter — Why CT Sizing Matters More Than You Think

CT-derived annular area is the gold standard for TAVR sizing — not mean diameter. A 3mm difference in CT-measured mean diameter can correspond to a 20% difference in annular area, potentially changing your valve size selection. Always review area, perimeter, AND diameter. Never size on a single measurement.

#002

TAVR · Access

Femoral Access Height Determines Everything — Identify the CFA Before You Puncture

The common femoral artery bifurcation is typically at the inferior border of the femoral head on fluoroscopy. Puncture above the bifurcation but below the inguinal ligament — too low risks pseudoaneurysm and AV fistula; too high risks retroperitoneal hemorrhage. Always use ultrasound guidance and confirm with fluoroscopy before large-bore access.

#003

Tricuspid · TEER

The TR Severity Trap — Echo Underestimates Torrential TR

Standard PISA-based TR quantification systematically underestimates severe and torrential TR. Use vena contracta width, hepatic vein systolic flow reversal, and RV size/function together — not PISA alone. Torrential TR (Grade 5) requires 3D echo or cardiac MRI for accurate quantification before TEER or TTVR planning.

#004

Watchman · LAA

LAA Morphology Predicts Closure Difficulty — Know the Anatomy Before You Start

Chicken-wing and cauliflower LAA morphologies are most challenging for Watchman FLX deployment. Minimum LAA depth 10mm from ostium to tip required for adequate compression. Chicken-wing LAAs with a bend less than 20mm from the ostium may need alternative sizing. Always measure depth, ostium diameter, and morphology on CT before the case.

#005

TAVR · Conduction

New LBBB After TAVR — Not Benign, Needs a Plan

New left bundle branch block after TAVR occurs in 10–30% of cases depending on valve platform. New LBBB with PR prolongation or pre-existing RBBB is a high-risk combination for complete AV block. Current consensus: monitor for 48–72 hours minimum, lower threshold for PPM implantation. A post-TAVR electrophysiology plan should be part of every pre-procedure discussion.

#006

TMVR · Planning

LVOTO Risk in TMVR — Calculate the Neo-LVOT Before Every Case

Left ventricular outflow tract obstruction is the most feared complication of transcatheter mitral valve replacement. Neo-LVOT area less than 170–189 mm² on CT planning predicts high LVOTO risk. In high-risk anatomy, LAMPOON (intentional anterior leaflet laceration to prevent LVOTO) should be pre-planned. Never proceed with TMVR without CT neo-LVOT calculation.

Coronary & High-Risk PCI Pearls

#007

IVUS · Left Main

MSA Targets in Left Main PCI — Don't Guess, Measure

Minimum stent area on IVUS predicts outcomes in LM PCI. Target MSA ≥8.0 mm² for ostial/body LM and ≥6.3 mm² for distal LM (ILUMIEN III/OPTIMAL criteria). Suboptimal MSA is the most common cause of LM restenosis. Post-dilate aggressively — achieve MSA targets before leaving the lab.

#008

Rotablator · Atherectomy

Rotablator Speed Matters — Stay Between 135,000–155,000 RPM

Rotational atherectomy works through orthogonal displacement of friction — not drilling. Speed drops greater than 5,000 RPM during ablation signal inadequate burr advancement and risk of burr entrapment. Keep runs under 30 seconds. If you're decelerating significantly, stop, flush, and reassess. Slow, steady advancement beats aggressive pushing every time.

#009

Aspiration Thrombectomy

Aspiration Thrombectomy in STEMI — Select Patients, Not All Patients

TOTAL and TAPAS trials showed routine aspiration thrombectomy does NOT improve outcomes in STEMI and may increase stroke risk. Reserve aspiration for large visible thrombus burden (TIMI thrombus grade 4–5) where you see impaired flow that is clearly thrombus-mediated. Selective use in high thrombus burden remains clinically reasonable; routine use is not recommended.

#010

IVL · Calcification

IVL Before Stenting — Crack the Calcium, Then Deploy

Intravascular lithotripsy modifies calcified plaque by delivering sonic pressure waves that selectively fracture calcium without damaging soft tissue. IVL significantly improves MSA vs. conventional balloon in severely calcified lesions (DISRUPT CAD III) and reduces procedural complications vs. rotablator in some anatomies. Ideal for circumferential calcium where atherectomy has higher perforation risk.

#011

High-Risk PCI · MCS

Protected PCI — Hemodynamic Support BEFORE You Start, Not After You're In Trouble

In protected PCI, the goal of MCS is prophylactic hemodynamic stabilization — not rescue. Impella placement before balloon inflations in unprotected LM or last-remaining-vessel PCI maintains perfusion pressure during ischemic time, allowing deliberate, unhurried technique. Inserting Impella after hemodynamic collapse is reactive and carries much higher risk than prophylactic insertion.

#012

FFR / iFR · Physiology

FFR vs. iFR — When They Disagree, Trust the Context

FFR and iFR concordance is ~80%. When they disagree: in microvascular disease (post-STEMI, T2DM, HFpEF), iFR may be falsely low due to altered diastolic microvascular resistance. In diffuse disease, FFR underestimates focal severity due to pressure wire drift. Know your patient phenotype before choosing your tool.

Cardiogenic Shock & MCS Pearls

#013

SCAI Shock · Staging

SCAI Shock Stages — Use Them in Real Time, Not Retrospectively

The SCAI shock classification (A–E) is most useful as a dynamic reassessment tool every 6–12 hours, not a static label on admission. Stage B patients who deteriorate to Stage C within 24 hours have significantly higher mortality than those who present de novo at Stage C. Serial reassessment changes management.

#014

Impella · Positioning

Impella Positioning — The Inlet Should Be 3.5cm Below the Aortic Valve

Optimal Impella CP/5.5 positioning: inlet port 3.5cm below the aortic valve annulus in the LV, confirmed on echo (PLAX view) and motor current signal (P-signal). Too deep = suction events from apical trabeculations. Too shallow = device in LVOT, aortic regurgitation, and hemolysis. Monitor motor current waveform continuously — flat waveform signals malposition.

#015

VA-ECMO · Configuration

VA-ECMO and LV Distension — Monitor for It, Plan for It

VA-ECMO increases LV afterload by retrograde aortic flow. In severe LV dysfunction, this causes LV distension, pulmonary edema, and thrombus formation. Pulmonary artery pulsatility index (PAPi) less than 0.9 predicts RV failure and LV distension on VA-ECMO. Have an LV venting strategy ready: Impella + ECMO (ECMELLA), Tandem Heart, or percutaneous balloon atrial septostomy.

#016

Shock · RHC

Right Heart Catheterization in Shock — You Cannot Manage What You Don't Measure

Clinical assessment of hemodynamics in cardiogenic shock is notoriously inaccurate. Pulmonary capillary wedge pressure, cardiac output (Fick preferred over thermodilution in low-flow states), and SVR cannot be reliably estimated clinically. Place a PA catheter early in all SCAI Stage C-E shock — it changes management in over 50% of cases and guides MCS escalation decisions.

Imaging & Echo Pearls

#017

Diastology · Echo

The 4-Variable Diastology Algorithm — When 3 of 4 Isn't Enough

ASE 2016 diastology algorithm: if ≥3 of 4 variables are abnormal (e/e' >14, septal e' <7 cm/s, TR Vmax >2.8 m/s, LA Vol index >34 mL/m²) → Grade II or III diastolic dysfunction. The algorithm fails most in HFpEF patients in sinus rhythm with normal LA volume — consider supplementary exercise stress echo if clinical suspicion is high despite normal resting echo.

#018

IVUS · Napkin Ring

IVUS Napkin Ring Sign — Near-Fatal Stenosis Missed by Angiography

The napkin ring sign on IVUS (circumferential calcium with abluminal necrotic core) predicts adverse cardiovascular events independent of stenosis severity. Angiography can severely underestimate left main severity in diffuse disease due to positive remodeling and absence of a normal reference segment. Treat the IVUS, not the angiogram. MSA <6mm² in LM on IVUS predicts outcomes regardless of percent diameter stenosis.

#019

TEE · Structural

TEE During Structural Procedures — Communicate With Your Imager Before You Start

The structural cardiologist-echocardiographer relationship is a procedural partnership. Pre-procedure TEE review should include agreement on: key measurements, imaging planes needed for guidance, and a real-time communication protocol during device deployment. Surprises in the lab (unexpected anatomy, device malposition) are managed better when the echo team knows what to look for before the case starts.

Radiation Safety Pearls

#020

Radiation · Distance

The Inverse Square Law — Your Most Powerful Radiation Protection Tool

Radiation dose decreases with the square of the distance from the source. Doubling your distance from the X-ray tube reduces your dose by 75%. Step back from the table during cine acquisition whenever possible. Even 30cm of additional distance during a 2-hour TAVR case significantly reduces cumulative operator dose over a career.

#021

Radiation · Scatter

Primary vs. Scatter Radiation — The Scatter Comes From the Patient, Not Just the Tube

Most operator radiation exposure comes from scatter radiation generated by the patient's body, not directly from the X-ray tube. The left side of the table (where operators typically stand) receives higher scatter dose during LAO projections — use pelvic lead shields and under-table drapes. Ceiling-mounted lead glass shields reduce head and neck dose by up to 90% when positioned correctly.

#022

Radiation · Fluoroscopy

Fluoro vs. Cine — Know the Difference in Dose

Cine acquisition delivers 10–20x more radiation per frame than low-dose fluoroscopy. Use fluoroscopy for navigation and cine only for critical anatomical documentation — pre-deployment positioning, valve expansion, final result. Unnecessary cine runs are the single biggest modifiable source of excess radiation in structural procedures. Review your DAP at the end of every case.

#023

Radiation · Pregnancy

Pregnant Operators in the Cath Lab — Policy Matters

The occupational dose limit for the embryo/fetus is 1 mSv per month once pregnancy is declared. Pregnant operators should wear a second dosimeter under the lead apron at waist level in addition to the standard collar dosimeter. Case volume, case complexity, and table position should be reviewed after pregnancy declaration. A written institutional policy protects both the operator and the institution.

Pharmacology Pearls

#024

P2Y12 · ACS

P2Y12 Timing in NSTEMI — Withhold Until Anatomy Is Known

The 2025 ACS guideline moves away from routine pre-hospital P2Y12 loading in NSTEMI. Withhold P2Y12 inhibitor until coronary anatomy is known in NSTEMI managed invasively — up to 40% have anatomy favoring CABG where pre-loading increases surgical bleeding risk without ischaemic benefit. Pre-load only in STEMI without planned immediate CABG.

#025

SGLT2i · Heart Failure

Starting SGLT2i In-Hospital — Earlier Than You Think

EMPULSE and SOLOIST-WHF data support initiating SGLT2 inhibitor during hospitalization for acute decompensated HF once hemodynamically stable and off IV diuretics — not waiting for outpatient follow-up. In-hospital initiation improves 90-day outcomes and is now endorsed by the 2022 ACC/AHA/HFSA HF guideline. Don't discharge without it.

#026

Heparin · ACT

ACT Targets in Structural Procedures — Higher Than You Think

For large-bore access structural cases (TAVR, TEER, Watchman), target ACT is higher than standard PCI. Target ACT 250–350 seconds during TAVR and structural procedures to prevent thrombus formation on delivery systems and valves. Check ACT every 30–60 minutes. Heparin clearance varies significantly — don't assume a bolus lasts the whole case.

Physiology & Decision-Making

#027

Heart Team · Decision Making

The Heart Team Is Not a Formality — It Is the Standard of Care

For all TAVR, TMVR, TTVR, and complex structural decisions, ACC/AHA guidelines mandate a multidisciplinary heart team. The heart team decision should be documented in the medical record with the rationale for transcatheter vs. surgical approach. This is not just best practice — it is a regulatory and medicolegal requirement. A solo operator unilaterally proceeding to TAVR without documented heart team discussion is not compliant with current guidelines.

#028

Frailty · Risk

STS Score Is Not the Only Risk Tool — Frailty Changes Everything

The STS-PROM predicts 30-day surgical mortality based on anatomical and physiological factors, but misses frailty — which is an independent predictor of outcomes after both surgical and transcatheter procedures. A 5-meter gait speed greater than 6 seconds (or inability to complete) identifies frailty and predicts 1-year mortality after TAVR independent of STS score. Always assess frailty independently of the STS score.

#029

Communication · Patient

Informed Consent Is a Conversation, Not a Signature

Informed consent for structural heart procedures — where alternatives exist (TAVR vs. SAVR vs. medical therapy) and outcomes are nuanced — requires a real conversation. Discuss: procedure-specific risks, expected benefits, recovery, valve durability, and what happens if nothing is done. A patient who understands their options and chooses TAVR is a partner in care. A patient who signed a form they don't understand is a liability. Take the time.