Systole

Systole
The time period when the heart is contracting. The period specifically during which the left ventricle of the heart contracts. The final letter in "systole" is pronounced as a long "e" as in "lee." The adjective for systole is systolic. The systolic pressure is specifically the maximum arterial pressure during contraction of the left ventricle of the heart. In a blood pressure reading, the systolic pressure is typically the first number recorded. For example, with a blood pressure of 120/80 ("120 over 80"), the systolic pressure is 120. By "120" is meant 120 mm Hg (millimeters of mercury). A systolic murmur is a heart murmur heard during systole, the time the heart contracts, between the normal first and second heart sounds. "Systole" came without change from the Greek systole meaning "a drawing together or a contraction." The term has been in use since the 16th century to denote the contraction of the heart muscle.
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Contraction of the heart, especially of the ventricles, by which the blood is driven through the aorta and pulmonary artery to traverse the systemic and pulmonary circulations, respectively; its occurrence is indicated physically by the first sound of the heart heard on auscultation, by the palpable apex beat, and by the arterial pulse. [G. s., a contracting]
- aborted s. a loss of the systolic beat in the radial pulse through weakness of the ventricular contraction.
- atrial s. contraction of the atria. SYN: auricular s..
- auricular s. SYN: atrial s..
- electrical s. the duration of the QRST complex ( i.e., from the earliest Q wave to the end of the latest T wave on the ECG).
- electromechanical s. the period from the beginning of the QRS complex to the first (aortic) vibration of the second heart sound. SYN: QS2 interval.
- late s. SYN: prediastole.
- ventricular s. contraction of the ventricles.

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sys·to·le 'sis-tə-(.)lē n the contraction of the heart by which the blood is forced onward and the circulation kept up compare DIASTOLE (1)
sys·tol·ic sis-'täl-ik adj

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n.
the period of the cardiac cycle during which the heart contracts. The term usually refers to ventricular systole, which lasts about 0.3 seconds. Atrial systole lasts about 0.1 seconds.
• systolic adj.

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sys·to·le (sisґto-le) [Gr. systolē a drawing together, contraction] the contraction, or period of contraction, of the heart, especially that of the ventricles; sometimes divided into components, as preejection and ejection periods, or isovolumic and ejection.

Medical dictionary. 2011.

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Look at other dictionaries:

  • systole — [ sistɔl ] n. f. • 1541; lat. systole, gr. sustolê « contraction » ♦ Physiol. Contraction du cœur par laquelle le sang est chassé dans les artères, qui commence par la contraction simultanée des deux oreillettes (systole auriculaire), suivie de… …   Encyclopédie Universelle

  • Systole — can mean the following:*Systole (medicine) is a term describing the contraction of the heart. *Systole (mathematics) is a term used in mathematics. *Systole (literature) is a term used to describe entry into the imagination/surreal in a text …   Wikipedia

  • systole — (n.) periodic contraction of the heart and arteries, 1570s, from Gk. systole contraction, from syn together (see SYN (Cf. syn )) + stem related to stellein to bring together, draw in; to put (see STALL (Cf. stall) (n.1)) …   Etymology dictionary

  • systole — [sis′tə lē΄] n. [ModL < Gr systolē < systellein, to draw together: see SYSTALTIC] the usual rhythmic contraction of the heart, esp. of the ventricles, following each dilatation (diastole), during which the blood is driven onward from the… …   English World dictionary

  • Systole — Sys to*le, n. [NL., fr. Gr. ?, fr. ? to contract; sy n with + ? to set, place.] 1. (Gram.) The shortening of the long syllable. [1913 Webster] 2. (Physiol. & Biol.) The contraction of the heart and arteries by which the blood is forced onward and …   The Collaborative International Dictionary of English

  • Systŏle — (gr., d.i. Zusammen , Einziehen), 1) der Moment, wo das Herz u. die Arterien durch ihre Zusammenziehung am meisten verengert sind u. das Blut aus ihnen fortgetrieben wird; vgl. Puls u. Arterien 2) c); 2) so v.w. Herzgespann; 3) in der Grammatik u …   Pierer's Universal-Lexikon

  • Systŏle — (griech., »Zusammenziehung«), in der Metrik im Gegensatz zur Diastole (s. d.) die Verkürzung einer langen Silbe vor der folgenden Hebung durch die Aussprache, z. B. »Obstupui stĕtĕruntque comae«. In der Physiologie die Zusammenziehung der… …   Meyers Großes Konversations-Lexikon

  • Systole — Systŏle (grch.), s. Diastole …   Kleines Konversations-Lexikon

  • Systole — Systole, griech., die kurze Aussprache einer langen Sylbe; in der Medicin die Zusammenziehung des Herzens …   Herders Conversations-Lexikon

  • Systole — Systole, Kontraktionsphase in der ⇒ Herzarbeit …   Deutsch wörterbuch der biologie

  • systole — ► NOUN ▪ the phase of the heartbeat when the heart muscle contracts and pumps blood into the arteries. Often contrasted with DIASTOLE(Cf. ↑diastolic). DERIVATIVES systolic adjective. ORIGIN Greek sustol , from sustellein to contract …   English terms dictionary

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