S1

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S1

Symbol for first heart sound.

S1

the first heart sound in the cardiac cycle, occurring at the outset of ventricular systole. It is associated with closure of the mitral and tricuspid valves and is synchronous with the apical pulse. Auscultated at the apex, it is longer, and lower than the second sound (S2), which follows it. The sound of the mitral valve is loudest at the apex of the heart, and that of the tricuspid valve is loudest at the left sternal border in the fourth intercostal space. See also lubb.

S1, S2, . . .

symbols for sacral nerves.

S1

First heart sound, which corresponds to the closure of the mitral and tricuspid valves, which is a long, low, “lubb” that occurs during systole. See S2, S3, S4.

S1

Abbreviation for first heart sound.
References in periodicals archive ?
What is the difference between filing a Form S-1 registration statement and filing Form 10 registration statement in a going public transaction?
NYSE:PVR), today announced that it will commence an initial public offering of 6,300,000 of its common units pursuant to a registration statement on Form S-1 previously filed with the Securities and Exchange Commission.
The resale of 84% of the shares (issued, and issuable on exercise of most of the warrants) originally was covered by the Company's Form S-1 registration statement which was filed in 2004.
In addition, the Company has filed its quarterly reports on Form 10-Q for the periods ended March 31, 2006 and June 30, 2006 and its Form S-1 registration statement seeking registration of the common shares issued in private placements completed in July 2005, March 2006 and June 2006.
The lawsuit claimed the contract award was "arbitrary and capricious," contending that the Lottery should have ignored questions raised by disclosures VLT made in a Form S-1 Stock Registration Statement filed with the Securities and Exchange Commission at the time VLT acquired Automated Wagering.
Miller, which was expected as disclosed in the Company's Registration Statement on Form S-1.
Consummation of the offer is subject to certain conditions, including consummation of certain financing transactions contemplated by the registration statement on Form S-1 filed with the Securities and Exchange Commission by American Seafoods Corporation.
com also announced that the Registration Statement on Form S-1, which was initially declared effective by the Securities and Exchange Commission at the close of business on May 11, 2004 (and most recently amended and supplemented on November 7, 2005), will no longer be effective.
NYSE: FHT) announced that it has filed a Form S-1 Registration Statement with the Securities and Exchange Commission regarding a proposed public offering of up to 5.
SAN DIEGO -- Ligand Pharmaceuticals Incorporated (Pink Sheets:LGND) announced today that it has filed a Form S-1 Registration Statement with the Securities and Exchange Commission for its existing employee stock plans: the employee and director stock incentive plan and the employee stock purchase plan.
reflecting the dELiA*s spin-off) will commence on the trading date immediately following the effectiveness date of the dELiA*s registration statement on Form S-1.
BPI) (TSX VENTURE:BPR), an independent energy company engaged in the exploration, production and commercial sale of coalbed methane (CBM) in the Illinois Basin, today announced that its Form S-1 Registration Statement has been declared effective by the U.