BACKGROUND: Although cardiac resynchronization therapy (CRT) is beneficial in heart failure patients with left bundle branch block, 30% of these patients do not respond to the therapy. Identifying these patients before implantation of the device is one of the current challenges in clinical cardiology. METHODS: We verified the diagnostic contribution and an optimized computerized approach to measuring ventricular electrical activation delay (VED) from body surface 12-lead ECGs. We applied the method to ECGs acquired before implantation (baseline) in the MADIT-CRT trial (Multicenter Automatic Defibrillator Implantation-Cardiac Resynchronization Therapy). VED values were dichotomized using its quartiles, and we tested the association of VED values with the MADIT-CRT primary end point of heart failure or death. Multivariate Cox proportional models were used to estimate the risk of study end points. In addition, the association between VED values and hemodynamic changes after CRT-D implantation was examined using 1-year follow-up echocardiograms. RESULTS: Our results showed that left bundle branch block patients with baseline VED <31.2 ms had a 35% risk of MADIT-CRT end points, whereas patients with VED ≥31.2 ms had a 14% risk (P<0.001). The hazard ratio for predicting primary end points in patients with low VED was 2.34 (95% confidence interval, 1.53-3.57; P<0.001). Higher VED values were also associated with beneficial hemodynamic changes. These strong VED associations were not found in the right bundle branch block and intraventricular conduction delay cohorts of the MADIT-CRT trial. CONCLUSIONS: Left bundle branch block patients with a high baseline VED value benefited most from CRT, whereas left bundle branch block patients with low VED did not show CRT benefits.

• Klíčová slova
• bundle-branch block, cardiac resynchronization therapy, electrocardiography, heart failure, prognosis,
• MeSH
• akční potenciály * MeSH
• blokáda Tawarova raménka diagnóza   mortalita   patofyziologie   terapie   MeSH
• časové faktory MeSH
• defibrilátory implantabilní * MeSH
• elektrická defibrilace škodlivé účinky   přístrojové vybavení   mortalita   MeSH
• elektrokardiografie * MeSH
• klinické rozhodování MeSH
• lidé středního věku MeSH
• lidé MeSH
• multicentrické studie jako téma MeSH
• obnova funkce MeSH
• prediktivní hodnota testů MeSH
• randomizované kontrolované studie jako téma MeSH
• retrospektivní studie MeSH
• senioři MeSH
• srdeční frekvence MeSH
• srdeční resynchronizační terapie * škodlivé účinky   mortalita   MeSH
• srdeční selhání diagnóza   mortalita   patofyziologie   terapie   MeSH
• výběr pacientů MeSH
• výsledek terapie MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

BACKGROUND: Percutaneous coronary intervention (PCI) performed within 12 h from symptom onset enables complete blood flow restoration in infarct-related artery in 90% of patients. Nevertheless, even with complete restoration of epicardial blood flow in culprit vessel (postprocedural Thrombolysis in Myocardial Infarction (TIMI) flow grade 3), myocardial perfusion at tissue level may be insufficient. We hypothesized that the outcome of patients with STEMI/bundle branch block (BBB)-myocardial infarction and post-PCI TIMI 3 flow is related to the time to reperfusion. METHODS: Observational study based on a retrospective analysis of population of 635 consecutive patients with STEMI/BBB-MI and post-PCI TIMI 3 flow from January 2009 to December 2011 (mean age 63 years, 69.6% males). Mortality of patients was evaluated in relation to the time from symptom onset to reperfusion. RESULTS: A total of 83 patients (13.07%) with postprocedural TIMI 3 flow after PCI had died at 1-year follow-up. Median TD in patients who survived was 3.92 h (iqr 5.43), in patients who died 6.0 h (iqr 11.42), P = 0.004. Multiple logistic regression analysis identified time delay ≥ 9 h as significantly related to 1-year mortality of patients with STEMI/BBB-MI and post-PCI TIMI 3 flow (OR 1.958, P = 0.026). Other significant variables associated with mortality in multivariate regression analysis were: left ventricle ejection fraction < 30% (P = 0.006), age > 65 years (P < 0.001), Killip class >2 (P <0.001), female gender (P = 0.019), and creatinine clearance < 30 mL/min (P < 0.001). CONCLUSION: Time delay to reperfusion is significantly related to 1-year mortality of patients with STEMI/BBB-MI and complete restoration of epicardial blood flow in culprit vessel after PCI.

• Klíčová slova
• PCI, STE myocardial infarction, TIMI 3 flow, microcirculation, mortality, time-delay,
• MeSH
• blokáda Tawarova raménka mortalita   chirurgie   MeSH
• čas zasáhnout při rozvinutí nemoci MeSH
• infarkt myokardu mortalita   chirurgie   MeSH
• Kaplanův-Meierův odhad MeSH
• koronární angioplastika mortalita   MeSH
• koronární stenóza mortalita   chirurgie   MeSH
• lidé středního věku MeSH
• lidé MeSH
• mikrocirkulace fyziologie   MeSH
• pooperační komplikace mortalita   MeSH
• reperfuze myokardu mortalita   MeSH
• retrospektivní studie MeSH
• senioři MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• pozorovací studie MeSH
• práce podpořená grantem MeSH
• Geografické názvy
• Česká republika epidemiologie   MeSH

BACKGROUND: Electric left ventricular lead position, assessed by the electric delay from the beginning of the QRS complex to the local LV electrogram (QLV), was found in previous studies to be a strong predictor of short-term response to cardiac resynchronization therapy. We hypothesized that suboptimum electric position of the left ventricular lead is associated with an excess of heart failure events and mortality. METHODS AND RESULTS: We analyzed the clinical outcome of patients with left bundle branch block or intraventricular conduction delay treated with cardiac resynchronization therapy at our institution during 9 years. Baseline clinical characteristics, QLV/QRS duration (QLV ratio) at cardiac resynchronization therapy implant, and data about heart failure hospitalization and mode of death were collected in 329 patients who were followed for a period of 3.3±1.9 years. Of them, 83 were hospitalized for heart failure and 83 died. Event rates for all-cause mortality, cardiac mortality, noncardiac mortality, heart failure mortality, and sudden death were 25.2%, 14.9%, 10.3%, 12.2%, and 2.1%, respectively. Patients with a QLV ratio ≤0.70 had significantly worse event-free survival for all study end points--hazard ratio, 1.6; 95% confidence interval, 1.0 to 2.4; P=0.05 for heart failure hospitalization; hazard ratio, 2.9; 95% confidence interval, 1.6 to 5.5; P=0.001 for heart failure mortality; hazard ratio, 1.8; 95% confidence interval, 1.1 to 2.7; P=0.01 for cardiac mortality; and hazard ratio, 2.1; 95% confidence interval, 1.2 to 3.7; P=0.01 for all-cause mortality. In multivariable analysis, QLV ratio ≤0.70 remained associated with all study end points. CONCLUSIONS: Electric left ventricular lead position in cardiac resynchronization therapy patients was a significant predictor of heart failure hospitalization and mortality.

• Klíčová slova
• bundle-branch block, cardiac resynchronization therapy, heart failure, hospitalization, mortality,
• MeSH
• blokáda Tawarova raménka mortalita   patofyziologie   terapie   MeSH
• Brugadův syndrom MeSH
• lidé MeSH
• míra přežití MeSH
• nemoci převodního systému srdečního MeSH
• prediktivní hodnota testů MeSH
• převodní systém srdeční abnormality   patofyziologie   MeSH
• prostředky srdeční resynchronizační terapie * MeSH
• retrospektivní studie MeSH
• senioři MeSH
• srdeční arytmie mortalita   patofyziologie   terapie   MeSH
• srdeční komory patofyziologie   MeSH
• Check Tag
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH

• MeSH
• blokáda Tawarova raménka mortalita   patofyziologie   MeSH
• časové faktory MeSH
• dospělí MeSH
• elektrokardiografie MeSH
• kardiopulmonální resuscitace * MeSH
• lidé středního věku MeSH
• lidé MeSH
• následné studie MeSH
• prognóza MeSH
• prospektivní studie MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• srdeční zástava mortalita   terapie   MeSH
• urgentní zdravotnické služby * MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• Publikační typ
• dopisy MeSH
• Geografické názvy
• Česká republika epidemiologie   MeSH