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In heart failure with CRT device implantation, problem solving
Typology: Summaries
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Definitions Responder: LVESV reduction ≥15% and/or meaningful clinical improvement. Non-responder: LVESV reduction <15%, minimal clinical improvement, or persistent HF events. Super-responder: LVESV reduction ≥30%, marked reverse remodeling, often LVEF normalization or increase ≥15–20%.
Scenario: BiV pacing falls to 85% Answer: AF with rapid ventricular response Reasoning: Loss of effective CRT due to conducted beats; control rate or consider AV node ablation.
Case 2 Scenario: Wide paced QRS after implant Answer: Suboptimal LV lead position Reasoning: Lateral/posterolateral veins usually provide better resynchronization.
Case 3 Scenario: Persistent HF despite 99% pacing Answer: Scar at LV pacing site Reasoning: Electrical capture may not produce mechanical benefit.
Case 4 Scenario: Diaphragmatic stimulation Answer: Phrenic nerve capture Reasoning: Reprogram vector/output or reposition LV lead.
Case 5 Scenario: Sudden loss of LV capture Answer: LV lead dislodgement Reasoning: Check thresholds, impedance, and chest X-ray.
Case 6 Scenario: High LV threshold Answer: Lead maturation/scar Reasoning: Increase output or revise lead if battery impact is excessive.
Case 7 Scenario: BiV pacing 92% in AF Answer: Insufficient CRT delivery Reasoning: Aim for >98% pacing.
Case 8 Scenario: Frequent PVCs reduce pacing Answer: PVC burden Reasoning: Ablation or antiarrhythmic therapy may improve CRT.
Case 9 Scenario: No symptomatic improvement at 6 months Answer: CRT non-responder Reasoning: Evaluate lead position, pacing %, scar, AF, and diagnosis.
Case 10 Scenario: Narrow intrinsic QRS Answer: Poor CRT candidate Reasoning: Benefit is lower in many narrow-QRS patients.
Case 11 Scenario: LBBB with QRS 180 ms improves dramatically Answer: Super-responder Reasoning: Typical profile with marked reverse remodeling.
Scenario: CRT patient develops new AF Answer: Reduced response Reasoning: AF management becomes critical.
Case 24 Scenario: QRS narrows significantly with CRT Answer: Good electrical response Reasoning: Often predicts favorable outcomes.
Case 25 Scenario: LVEF rises from 25% to 55% Answer: Super-responder Reasoning: Marked reverse remodeling and recovery.
