Electrical vs mechanical systole in heart failure with symptoms of systolic dysfunction.
Translated title
Electrical vs mechanical systole in heart failure with symptoms of systolic dysfunction
Author
Liu, Haiyong
Term
4. term
Publication year
2014
Submitted on
2014-01-03
Pages
52
Abstract
Hjertesvigt er hyppigt og ofte forbundet med nedsat systolisk funktion i venstre ventrikel, hvilket øger risikoen for symptomer, elektrisk ustabilitet og tidlig død. Da et normalt EKG kan overse systolisk dysfunktion, undersøger dette projekt, om koblingen mellem elektrisk systole (QT-interval på EKG) og mekanisk systole (QS2 målt med fonokardiogram, PCG) kan forbedre identificeringen af systolisk hjertesvigt. På baggrund af tidligere fund—hvor QT normalt er lidt kortere end QS2, men QT > QS2 er beskrevet ved koronararteriesygdom—formuleredes forskningsspørgsmålet: Kan QT > QS2 bruges som kriterium for systolisk dysfunktion? Studiet omfattede 10 patienter med symptomer på systolisk dysfunktion (8 mænd, 2 kvinder), alle med biventrikulær pacemaker (CRT), samt 2 raske mandlige kontrolpersoner. Samtidige EKG- og PCG-optagelser i hvile blev udført i forskellige pacingsituationer, hvorefter QT- og QS2-intervaller blev udmålt og analyseret statistisk. Resultaterne viser, at QT > QS2 kan observeres hos patienter med hjertesvigt og systolisk dysfunktion, men at denne relation ikke er egnet som selvstændigt diagnostisk kriterium for systolisk hjertesvigt. Fundene peger på, at kombinerede elektriske og mekaniske mål kan give indsigt i systolisk funktion, men ikke alene bør danne grundlag for diagnosen.
Heart failure is common and often linked to left ventricular systolic dysfunction, which increases symptoms, electrical instability, and premature death. Because a normal ECG can miss systolic dysfunction, this project examined whether combining electrical systole (QT interval on ECG) and mechanical systole (QS2 from phonocardiography, PCG) could improve identification of systolic heart failure. Building on prior observations—that QT is normally slightly shorter than QS2, whereas QT > QS2 has been reported in coronary artery disease—the research question was whether QT > QS2 could serve as a criterion for systolic dysfunction. The study included 10 patients with symptoms of systolic dysfunction (8 men, 2 women), all with cardiac resynchronization therapy (CRT) devices, and 2 healthy male controls. Simultaneous ECG and PCG recordings were obtained at rest under different pacing conditions, QT and QS2 intervals were extracted, and statistical analyses were performed. The results indicate that QT > QS2 can be observed in heart failure patients with systolic dysfunction, but it is not suitable as a standalone diagnostic criterion for systolic heart failure. These findings suggest that combined electrical and mechanical measures add insight into systolic function but should not be used alone for diagnosis.
[This summary has been generated with the help of AI directly from the project (PDF)]
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