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1.
Indian Heart J ; 73(3): 325-330, 2021.
Article in English | MEDLINE | ID: mdl-34154750

ABSTRACT

BACKGROUND: Fragmented QRS (fQRS) is defined as any QRS complex with duration of less than 120 ms (ms) and at least one notch in the R or S wave in two or more leads belonging to the same coronary territory. The fQRS represents a delay in ventricular conduction caused by a myocardial scar associated to arrhythmic events. METHODS: This is a descriptive, retrospective, cross-sectional study of a total of 123 patientsadmitted with ischemic heart disease. The aim was to correlate the presence of fQRS in a conventional 12-leads electrocardiogram (ECG) with myocardial regional motility disorders. RESULTS: A total of 62% of the patients were male, the mean age was 63 ± 12 SD. fQRS was observed in 44% (64% men and 36% women), the most frequent location being the inferior wall (61%), followed by the anteroseptal and lateral walls (14% for both). Of the 36 patients with fQRS, 30 had segmental disorders, while 6 did not. Of the 45 patients without fQRS, 28 had segmental disorders, but 17 did not, which gives us a sensitivity of 52% (moderate SnNout) and specificity of 74% (high SpPin), with a positive predictive value of 83%, a negative predictive value of 38% and a prevalence of 72%. CONCLUSION: The presence of fQRS in the ECG has high specificity and a high positive predictive value of the existence of segmental myocardial motility disorders in patients with documented coronary artery disease.


Subject(s)
Coronary Artery Disease , Aged , Coronary Artery Disease/diagnosis , Cross-Sectional Studies , Electrocardiography , Female , Humans , Male , Middle Aged , Myocardium , Predictive Value of Tests , Retrospective Studies
2.
Arq. bras. cardiol ; Arq. bras. cardiol;112(1): 59-64, Jan. 2019. tab, graf
Article in English | LILACS | ID: biblio-973844

ABSTRACT

Abstract Background: Fragmented QRS (fQRS) is a sign of adverse cardiovascular events in various cardiovascular diseases. It is also associated with increased blood pressure and non-dipping in hypertensive patients. However, no study has investigated the importance of fQRS in prehypertensive patients. Objectives: The aim of our study is to investigate the relationship between fQRS and non-dipper status in prehypertensive patients. Methods: Two hundred and sixteen eligible, newly diagnosed prehypertensive patients who underwent 24-hour ambulatory blood pressure monitoring (ABPM) for further evaluation of blood pressure between June 2015 and July 2016 were included into the study. Patients were divided into three groups according to ABPM results: normotensives, dipper prehypertensives, and non-dipper prehypertensives. Groups were compared regarding presence of fQRS on electrocardiography. Additionally, multinomial logistic regression analysis was used to determine the relationship between fQRS and blood pressure pattern in prehypertensive patients. Results: According to ABPM recordings, 61 patients had normotensive blood pressure pattern (systolic blood pressure < 120 mmHg and diastolic blood pressure < 80 mmHg). Of the remaining 155 prehypertensive patients, 83 were dippers and 72 were non-dippers. Non-dipper prehypertensives had a significantly higher frequency of fQRS compared to normotensives (p = 0.048). Furthermore, multinomial logistic regression analysis revealed that fQRS is an independent predictor of non-dipping blood pressure pattern in prehypertensive patients (p = 0.017, OR: 4.071, 95% CI: 1.281-12.936). Conclusions: We found that fQRS is a predictor of non-dipping in prehypertensives. As a marker of fibrosis and higher fibrotic burden within myocardium, fQRS may be useful in identifying high-risk prehypertensive patients before the development of hypertension.


Resumo Fundamento: A fragmentação do QRS (fQRS) é um sinal de eventos cardiovasculares adversos em várias doenças cardiovasculares. É associado também à pressão arterial elevada e à ausência de descenso da pressão arterial durante o sono (non-dipping) em pacientes pré-hipertensos. Objetivos: O objetivo do estudo presente é investigar a relação entre fQRS e ausência de descenso da pressão arterial durante o sono em pacientes pré-hipertensos. Métodos: Duzentos e dezesseis pacientes elegíveis, recém-diagnosticados com pré-hipertensão, que foram submetidos a monitorização ambulatorial da pressão arterial (MAPA) durante 24 horas para avaliação mais aprofundada da pressão arterial entre junho de 2015 e julho de 2016, foram incluídos no estudo. De acordo com os resultados da MAPA, os pacientes foram divididos em três grupos: normotensos, pré-hipertensos com descenso da pressão arterial durante o sono (padrão dipping) e pré-hipertensos com ausência de descenso da pressão arterial durante o sono (padrão non-dipping). Os grupos foram comparados quanto à presença de fQRS no eletrocardiograma. Adicionalmente, utilizou-se a análise de regressão logística multinomial para determinar a relação entre a fQRS e o padrão de pressão arterial em pacientes pré-hipertensos. Resultados: De acordo com os registos da MAPA, 61 pacientes apresentavam padrão de pressão arterial normotenso (pressão arterial sistólica < 120 mmHg e pressão arterial diastólica < 80 mmHg). Dos 155 pacientes pré-hipertensos, 83 tinham padrão dipping e 72 tinham padrão non-dipping. Os pacientes pré-hipertensos com padrão non-dipping tinham uma frequência significativamente mais alta de fQRS em comparação com os pacientes normotensos (p = 0,048). Além disso, a análise de regressão logística multinomial revelou que fQRS é um preditor independente do padrão non-dipping de pressão arterial em pacientes pré-hipertensos (p = 0,017, OR: 4,071, 95 % CI: 1,281-12,936). Conclusões: Verificamos que a fQRS é um preditor do padrão non-dipping em pacientes pré-hipertensos. Como marcador de fibrose e aumento na carga fibrótica do miocárdio, a fQRS pode ser útil na identificação de pacientes pré-hipertensos de alto risco antes do desenvolvimento da hipertensão.


Subject(s)
Humans , Male , Female , Middle Aged , Electrocardiography/methods , Prehypertension/physiopathology , Hypertension/physiopathology , Reference Values , Time Factors , Blood Pressure/physiology , Case-Control Studies , Logistic Models , Predictive Value of Tests , Risk Factors , Analysis of Variance , Statistics, Nonparametric
3.
Curr Health Sci J ; 45(4): 398-404, 2019.
Article in English | MEDLINE | ID: mdl-32110442

ABSTRACT

BACKGROUND: The fragmented QRS complex (FQRS) was found to be associated to malignant ventricular arrhythmias and sudden death in patients with hypertrophic cardiomyopathy and other entities. There is scant data available correlating the presence of FQRS with QT interval prolongation in patients with ischemic heart disease (IHD). METHODS: A descriptive, retrospective, cross-sectional study was performed in 123 patients with IHD to analyze and correlate the presence of FQRS with QT interval prolongation in the conventional 12-leads electrocardiogram in patients with documented chronic IHD. RESULTS: There were 62% male patients. The mean age was 63.8±12.6 years. Thirty six (44%) patients had fragmented QRS (64% men and 36% women). The duration of QT and QTc, the mean values were 413±59ms, and 463±67ms, respectively. Of the 36 patients with FQRS, 23 patients have prolongation of the QTc interval, and 13 patients did not present it. Of the 45 patients without FQRS, 21 of them have prolongation of the QTc interval, and 24 patients did not have it. These data resulted in a sensitivity of 52% with a moderate SnNout, a specificity of 65% with moderate SpPin, a positive predictive accuracy of 64%, a negative predictive accuracy of 53%. These data resulted in a prevalence of 54%. CONCLUSION: the presence of FQRS in the ECG has a moderate sensitivity and specificity, as well as, moderate negative and positive predictive value of the existence of QT interval prolongation in patients with ischemic heart disease.

4.
Arq. bras. cardiol ; Arq. bras. cardiol;107(4): 299-304, Oct. 2016. tab, graf
Article in English | LILACS | ID: biblio-827851

ABSTRACT

Abstract Background: Only a small proportion of patients referred for coronary angiography with suspected coronary artery disease (CAD) have the diagnosis of obstructive CAD confirmed by the exam. For this reason, further strategies for risk stratification are necessary. Objective: To investigate the relationship of the presence of fragmented QRS (fQRS) on admission electrocardiogram with angiographically detected CAD and CAD severity in patients without known vascular diseases and myocardial fibrosis, undergoing first diagnostic coronary angiography. Methods: We enrolled 336 consecutive patients undergoing coronary angiography for suspected CAD. The patients were divided into two groups according to the presence or absence of fQRS on admission. We compared the groups regarding the presence and severity of CAD. Results: Seventy-nine (23.5%) patients had fQRS on admission. There was not a statistically significant difference between patients with fQRS (41.8%) and non-fQRS (30.4%), regarding the presence of CAD (p = 0.059). However, there was a statistically significant difference between patients with fQRS and non-fQRS regarding the presence of stenotic CAD (40.5% vs. 10.5%, p<0.001) and multi vessel disease (25,3% vs. 5.1%, p<0.001). The frequency of fQRS was significantly higher in patients with SYNTAX score >22 compared to patients with SYNTAX score ≤22. Conclusions: Our findings suggest that fQRS may be an indicator of early-stage myocardial damage preceding the appearance of fibrosis and scar, and may be used for risk stratification in patients undergoing first diagnostic coronary angiography


Resumo Fundamento: Somente uma pequena proporção dos pacientes com suspeita de doença arterial coronariana (DAC), encaminhados para realizarem angiografia coronária, tem o diagnóstico de DAC obstrutiva confirmado pelo exame. Por isso, outras estratégias de estratificação de risco são necessárias. Objetivo: Investigar a relação da presença de QRS fragmentado (QRSf) no eletrocardiograma na admissão com DAC detectada por angiografia e gravidade da DAC em pacientes sem diagnóstico de doenças vasculares, ou fibrose miocárdica, submetidos à primeira angiografia coronária de diagnóstico. Métodos: Recrutamos 336 pacientes consecutivos que se submeteram à angiografia coronária por suspeita de DAC. Os pacientes foram divididos em dois grupos de acordo com a presença ou ausência de QRSf na admissão. Nós comparamos os grupos quanto à presença e gravidade de DAC. Resultados: Setenta e nove (23,5%) pacientes apresentaram QRSf na admissão. Não houve diferença estatisticamente significativa entre pacientes com QRSf (41.8%) e sem QRSf (30,4%) (p = 0,059) quanto à presença de DAC. No entanto, houve uma diferença estatisticamente significativa entre pacientes com e sem QRSf quanto à presença de DAC (40.5% vs. 10.5%, p < 0,001) e de doença de múltiplos vasos (25,3% vs. 5,1%, p < 0,001). A frequência de QRSf foi significativamente maior em pacientes com escore SYNTAX > 22 em comparação a pacientes com escore SYNTAX ≤ 22. Conclusões: Nossos achados sugerem que o QRSf pode ser um indicador de danos iniciais no miocárdio antecedendo o aparecimento de fibrose e cicatrização, e pode ser usado para estratificação de risco em pacientes submetidos à primeira angiografia coronária de diagnóstico.


Subject(s)
Humans , Male , Middle Aged , Coronary Artery Disease/physiopathology , Coronary Artery Disease/diagnostic imaging , Coronary Angiography/methods , Risk Assessment/methods , Electrocardiography/methods , Patient Admission , Severity of Illness Index , Fibrosis , Predictive Value of Tests , Reproducibility of Results , Risk Factors , Statistics, Nonparametric , Myocardium/pathology
5.
Insuf. card ; 8(1): 2-8, mar. 2013. ilus, tab
Article in Spanish | LILACS | ID: lil-694718

ABSTRACT

Introducción. El QRS fragmentado (QRSf) representa un retraso en la conducción ventricular causada por una cicatriz miocárdica y podría asociarse a un mayor riesgo de mortalidad y eventos arrítmicos. Objetivo. Correlacionar el QRSf con trastornos de motilidad regional y su asociación con el resultado de la cinecoronariografía y obtener el valor clínico del QRSf para identificar población de riesgo en el curso de un síndrome coronario agudo (SCA). Materiales y métodos. Se evaluaron retrospectivamente pacientes ingresados en nuestra institución con diagnóstico de SCA. Se buscó en el electrocardiograma (ECG) la presencia de QRSf y se lo relacionó con el compromiso de la motilidad parietal por ecocardiograma y con la anatomía coronaria. Resultados. Se analizaron 116 pacientes, edad promedio de 64,6 años (75%, hombres), el 78,2% correspondió a SCA sin elevación del segmento ST, de los cuales el 36% tuvo QRSf, al igual que el 68% de los que tuvieron elevación del ST. El 47,4% del total de pacientes presentó QRSf. En el 72% de los pacientes con QRSf se observó algún trastorno de motilidad parietal en el ecocardiograma (p< 0,03). En el 28% de los casos, se evidenció una correlación entre la región con QRSf en el ECG y la región hipoquinética o aquinética por ecocardiograma. La mortalidad global intrahospitalaria fue del 6,9%; de los cuales el 12,5% mostró QRSf. De los pacientes con enfermedad de más de un vaso, el 74,2% evidenció QRSf (p< 0,05), mientras que el 41% presentó enfermedad de tres vasos. Conclusiones. El QRSf se asoció de manera significativa a la presencia de enfermedad de más de un vaso y shock cardiogénico, pero no con la mortalidad. Encontramos una significativa asociación entre la presencia de trastornos regionales de contractilidad y la anatomía coronaria, pudiendo relacionar entre sí datos ecocardiográficos, hemodinámicos e imagenológicos.


Introduction. The fragmented QRS (fQRS) represents a ventricular conduction delay caused by a myocardial scar and may be associated with an increased risk of mortality and arrhythmics events. Objective. The fQRS correlate with regional motility disorders and their association with the outcome of coronary angiography and get fQRS clinical value to identify the population at risk in the course of an acute coronary syndrome (ACS). Materials and methods. It retrospectively evaluated patients admitted our institution with a diagnosis of ACS. Searched the electrocardiogram (ECG) the presence of fQRS and related it to the commitment of wall motion by echocardiography and coronary anatomy. Results. There were evaluated 116 patients, average age 64.6% years (75% male). The 78.2% corresponded to ACS without ST segment elevation, of which 36% had fQRS, like 68% that had ST elevation. Among the whole of patients, the 47.4% presented fQRS. In 72% of patients showed some kind of parietal motility disorders in echocardiogram (p< 0.03). The 28% of remaining cases had demonstrated the correlation between the wall with fQRS in the ECG and the hypokinetic or akinetic area by echocardiogram. The in-hospital global mortality was of 6.9%, of which 12.5% had fQRS. Among the patients with more than one vessel disease, 74.2% showed fQRS (p< 0.05) and 41% presented three vessels disease. Conclusions. The fQRS was associated significantly with the presence of more than one vessel disease and cardiogenic shock, but not with mortality. We found a huge association between the presence of regional contractility disorders and coronary anatomy, making possible the relationship between echocardiographic, hemodynamic and imaging data.


Introdução. O QRS fragmentado (QRSf) representa um atraso de condução ventricular causada por uma cicatriz do miocárdio e pode estar associada com um risco aumentado de mortalidade e de eventos arrítmicos. Objetivo. Correlacionar o QRSf com distúrbios de motilidade regionais e sua associação com o resultado da angiografia coronária e obter o valor clínico do QRSf para identificar populações em risco no curso de uma síndrome coronária aguda (SCA). Materiais e métodos. Foram avaliados retrospectivamente os pacientes internados em nossa instituição com um diagnóstico de SCA. Procurando a presença de QRSf no ECG e relacionado para o compromisso do movimento da parede por meio de ecocardiografia e anatomia coronária. Resultados. Foram avaliados 116 pacientes, com idade média de 64,6 anos (75% do sexo masculino), O 78,2% corresponderam a SCA sem elevação do segmento ST, dos quais 36% tinham QRSf, como 68% dos que tinham elevação de ST. O 47,4% dos pacientes presenteou QRSf. Em 72% dos pacientes com QRSf apresentavam algum transtorno de movimento da parede no ecocardiograma (p< 0,03). Em 28% dos casos foi encontrada uma correlação entre a região com QRSf no ECG e a região hipoquinética ou região acinético pelo ecocardiograma. Mortalidade hospitalar global foi do 6,9%, dos quais 12,5% com QRSf. Dos pacientes com doença de mais de um vaso arterial, o 74,2% apresentaram QRSf (p< 0,05), enquanto que o 41% tinham doença de três vasos. Conclusões. O QRSf significativamente associados com a presença da doença de mais de um vaso arterial e choque cardiogénico, mas não com a mortalidade. Encontramos uma associação significativa entre a presença de distúrbios de contratilidade regional e anatomia coronária, tornando possível a relação entre dados ecocardiográficos, hemodinâmicos e os de imagem.

6.
Insuf. card ; 8(1): 2-8, mar. 2013. ilus, tab
Article in Spanish | BINACIS | ID: bin-130859

ABSTRACT

Introducción. El QRS fragmentado (QRSf) representa un retraso en la conducción ventricular causada por una cicatriz miocárdica y podría asociarse a un mayor riesgo de mortalidad y eventos arrítmicos. Objetivo. Correlacionar el QRSf con trastornos de motilidad regional y su asociación con el resultado de la cinecoronariografía y obtener el valor clínico del QRSf para identificar población de riesgo en el curso de un síndrome coronario agudo (SCA). Materiales y métodos. Se evaluaron retrospectivamente pacientes ingresados en nuestra institución con diagnóstico de SCA. Se buscó en el electrocardiograma (ECG) la presencia de QRSf y se lo relacionó con el compromiso de la motilidad parietal por ecocardiograma y con la anatomía coronaria. Resultados. Se analizaron 116 pacientes, edad promedio de 64,6 años (75%, hombres), el 78,2% correspondió a SCA sin elevación del segmento ST, de los cuales el 36% tuvo QRSf, al igual que el 68% de los que tuvieron elevación del ST. El 47,4% del total de pacientes presentó QRSf. En el 72% de los pacientes con QRSf se observó algún trastorno de motilidad parietal en el ecocardiograma (p< 0,03). En el 28% de los casos, se evidenció una correlación entre la región con QRSf en el ECG y la región hipoquinética o aquinética por ecocardiograma. La mortalidad global intrahospitalaria fue del 6,9%; de los cuales el 12,5% mostró QRSf. De los pacientes con enfermedad de más de un vaso, el 74,2% evidenció QRSf (p< 0,05), mientras que el 41% presentó enfermedad de tres vasos. Conclusiones. El QRSf se asoció de manera significativa a la presencia de enfermedad de más de un vaso y shock cardiogénico, pero no con la mortalidad. Encontramos una significativa asociación entre la presencia de trastornos regionales de contractilidad y la anatomía coronaria, pudiendo relacionar entre sí datos ecocardiográficos, hemodinámicos e imagenológicos.(AU)


Introduction. The fragmented QRS (fQRS) represents a ventricular conduction delay caused by a myocardial scar and may be associated with an increased risk of mortality and arrhythmics events. Objective. The fQRS correlate with regional motility disorders and their association with the outcome of coronary angiography and get fQRS clinical value to identify the population at risk in the course of an acute coronary syndrome (ACS). Materials and methods. It retrospectively evaluated patients admitted our institution with a diagnosis of ACS. Searched the electrocardiogram (ECG) the presence of fQRS and related it to the commitment of wall motion by echocardiography and coronary anatomy. Results. There were evaluated 116 patients, average age 64.6% years (75% male). The 78.2% corresponded to ACS without ST segment elevation, of which 36% had fQRS, like 68% that had ST elevation. Among the whole of patients, the 47.4% presented fQRS. In 72% of patients showed some kind of parietal motility disorders in echocardiogram (p< 0.03). The 28% of remaining cases had demonstrated the correlation between the wall with fQRS in the ECG and the hypokinetic or akinetic area by echocardiogram. The in-hospital global mortality was of 6.9%, of which 12.5% had fQRS. Among the patients with more than one vessel disease, 74.2% showed fQRS (p< 0.05) and 41% presented three vessels disease. Conclusions. The fQRS was associated significantly with the presence of more than one vessel disease and cardiogenic shock, but not with mortality. We found a huge association between the presence of regional contractility disorders and coronary anatomy, making possible the relationship between echocardiographic, hemodynamic and imaging data.(AU)


IntroduþÒo. O QRS fragmentado (QRSf) representa um atraso de conduþÒo ventricular causada por uma cicatriz do miocárdio e pode estar associada com um risco aumentado de mortalidade e de eventos arrítmicos. Objetivo. Correlacionar o QRSf com distúrbios de motilidade regionais e sua associaþÒo com o resultado da angiografia coronária e obter o valor clínico do QRSf para identificar populaþ§es em risco no curso de uma síndrome coronária aguda (SCA). Materiais e métodos. Foram avaliados retrospectivamente os pacientes internados em nossa instituiþÒo com um diagnóstico de SCA. Procurando a presenþa de QRSf no ECG e relacionado para o compromisso do movimento da parede por meio de ecocardiografia e anatomia coronária. Resultados. Foram avaliados 116 pacientes, com idade média de 64,6 anos (75% do sexo masculino), O 78,2% corresponderam a SCA sem elevaþÒo do segmento ST, dos quais 36% tinham QRSf, como 68% dos que tinham elevaþÒo de ST. O 47,4% dos pacientes presenteou QRSf. Em 72% dos pacientes com QRSf apresentavam algum transtorno de movimento da parede no ecocardiograma (p< 0,03). Em 28% dos casos foi encontrada uma correlaþÒo entre a regiÒo com QRSf no ECG e a regiÒo hipoquinética ou regiÒo acinético pelo ecocardiograma. Mortalidade hospitalar global foi do 6,9%, dos quais 12,5% com QRSf. Dos pacientes com doenþa de mais de um vaso arterial, o 74,2% apresentaram QRSf (p< 0,05), enquanto que o 41% tinham doenþa de trìs vasos. Conclus§es. O QRSf significativamente associados com a presenþa da doenþa de mais de um vaso arterial e choque cardiogénico, mas nÒo com a mortalidade. Encontramos uma associaþÒo significativa entre a presenþa de distúrbios de contratilidade regional e anatomia coronária, tornando possível a relaþÒo entre dados ecocardiográficos, hemodinÔmicos e os de imagem.(AU)

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