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the claim
The cardiac interval between heart sounds S1 and S2 represents systole
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
5 sources for · 0 against

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.

Evidence for · 5
Book: Medical Semiology Guide of the Cardiovascular System and the Hematologic System
2019 · cited by 0
Explicitly notes that between S1 and S2 lies systole.
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How claims like this are judged

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

More for · 4
Book: Fundamentals of Nursing Practice
1987 · cited by 0
States that S1 occurs at the beginning of ventricular systole, marking the start of the interval.
Российский кардиологический журнал: DIAGNOSIS OF ARRHYTHMIA DISEASES USING HEART SOUNDS AND ECG SIGNALS
2014 · cited by 0
States phonocardiogram segmentation places systole between S1 and S2.
OpenAIRE: Computer-Based Detection and Analysis of Heart Sound and Murmur
2005 · cited by 0
Identifies the systolic segment as occurring between the first and second heart sounds.
OpenAIRE: Characterization of cardiac time intervals in healthy bonnet macaques (Macaca radiata) by using an electronic stethoscope.
2011 · cited by 0
Measures the time interval between the first and second heart sounds (S1S2) representing ventricular ejection (systole).
Everything we examined (18)
  1. Wikipedia: Heart soundsreferenceno side takennot shown: read and judged not to bear on this claim
  2. Wikipedia: Systolereferenceno side takennot shown: read and judged not to bear on this claim
  3. Book: Medical Semiology Guide of the Cardiovascular System and the Hematologic Systemreferencesupports
  4. Book: Fundamentals of Nursing Practicereferencesupports
  5. Book: Myles' Textbook for Midwives E-Bookreferenceno side takennot shown: read and judged not to bear on this claim
  6. Book: 13th International Conference on Biomedical Engineeringreferenceno side takennot shown: read and judged not to bear on this claim
  7. Book: AACN Core Curriculum for Pediatric High Acuity, Progressive, and Critical Care Nursing, Third Editionreferencesupportsnot shown: beyond the two books we show per side
  8. Book: Encyclopedia of Medical Devices and Instrumentation, Hydrocephalus, Tools for Diagnosis and Treatment of - Monoclonal Antibodiesreferenceno side takennot shown: read and judged not to bear on this claim
  9. Pesquisa Veterinária Brasileira: Auscultatory and electrocardiographic characteristics of Crioulo horsespeer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Российский кардиологический журнал: DIAGNOSIS OF ARRHYTHMIA DISEASES USING HEART SOUNDS AND ECG SIGNALSpeer-reviewedsupports
  11. Sensors: Development of a Finger-Ring-Shaped Hybrid Smart Stethoscope for Automatic S1 and S2 Heart Sound Identificationpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. Journal of Sport and Health Science: Effect of yelling on maximal aerobic power during an incremental test of cycling performancepeer-reviewedno side takennot shown: read and judged not to bear on this claim
  13. OpenAIRE: Computer-Based Detection and Analysis of Heart Sound and Murmurpeer-reviewedsupports
  14. OpenAIRE: Delayed timing of heart and arterial sounds in patients with implanted pacemakerspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  15. OpenAIRE: MAXIMAL OVERLAP DISCRETE WAVELET TRANSFORM-BASED ABRUPT CHANGES DETECTION FOR HEART SOUNDS SEGMENTATIONpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  16. OpenAIRE: Characterization of cardiac time intervals in healthy bonnet macaques (Macaca radiata) by using an electronic stethoscope.peer-reviewedsupports
  17. OpenAIRE: DIAGNOSIS OF ARRHYTHMIA DISEASES USING HEART SOUNDS AND ECG SIGNALSpeer-reviewedsupports
  18. OpenAIRE: The prevalence of the third and fourth heart sounds in clinically healthy Holstein cattlepeer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → SUPPORTED · 7505 Aug 2026
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