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the claim

The cardiac interval between heart sounds S1 and S2 represents systole

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the cardiac interval between heart sounds S1 and S2 represents systole?

Yes. Medical references and studies confirm that the cardiac time interval between the first heart sound (S1) and the second heart sound (S2) corresponds to ventricular systole.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked

How claims like this are judged

Judged against reference works: claims of this kind are settled by reference works, not journal abstracts.

Evidence for · 5
Book: Medical Semiology Guide of the Cardiovascular System and the Hematologic System
2019
Explicitly notes that between S1 and S2 lies systole.
Get citation
Stoicescu, M. (2019). Book: Medical Semiology Guide of the Cardiovascular System and the Hematologic System. Academic Press. https://play.google.com/store/books/details?id=2ey_DwAAQBAJ&source=gbs_api

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More for · 4
Book: Fundamentals of Nursing Practice
1987
States that S1 occurs at the beginning of ventricular systole, marking the start of the interval.
Get citation
Narrow, B. W. (1987). Book: Fundamentals of Nursing Practice. John Wiley & Sons. http://books.google.com/books?id=xBhtAAAAMAAJ&dq=The+cardiac+interval+between+heart+sounds+S1+and+S2+represents+systole&hl=&as_pt=BOOKS&source=gbs_api

Российский кардиологический журнал: DIAGNOSIS OF ARRHYTHMIA DISEASES USING HEART SOUNDS AND ECG SIGNALS
2014
States phonocardiogram segmentation places systole between S1 and S2.
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Kalaivani, V. (2014). Российский кардиологический журнал: DIAGNOSIS OF ARRHYTHMIA DISEASES USING HEART SOUNDS AND ECG SIGNALS. Российский кардиологический журнал. https://doi.org/10.15829/1560-4071-2014-1-ENG-35-41

2 recorded entries grouped as this source

Additional records of the same source are shown below. They are not counted as additional sources.

OpenAIRE: DIAGNOSIS OF ARRHYTHMIA DISEASES USING HEART SOUNDS AND ECG SIGNALS
2014
Segments heart sounds into S1, systole, S2, and diastole in sequence.
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OpenAIRE: DIAGNOSIS OF ARRHYTHMIA DISEASES USING HEART SOUNDS AND ECG SIGNALS. (2014). OpenAIRE. https://doi.org/10.15829/1560-4071-2014-1-eng-35-41

OpenAIRE: Computer-Based Detection and Analysis of Heart Sound and Murmur
2005
Identifies the systolic segment as occurring between the first and second heart sounds.
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OpenAIRE: Computer-Based Detection and Analysis of Heart Sound and Murmur. (2005). OpenAIRE. https://doi.org/10.1007/s10439-005-4053-3

OpenAIRE: Characterization of cardiac time intervals in healthy bonnet macaques (Macaca radiata) by using an electronic stethoscope.
2011
Measures the time interval between the first and second heart sounds (S1S2) representing ventricular ejection (systole).
Get citation
OpenAIRE: Characterization of cardiac time intervals in healthy bonnet macaques (Macaca radiata) by using an electronic stethoscope.. (2011). OpenAIRE. https://explore.openaire.eu/

Receipt History
first checked05 Aug 2026
judged → SUPPORTED · 7505 Aug 2026
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