What is the difference between s1 and s2

The "lub" is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second heart sound, "dub" or S2, is caused by the closure of the aortic and pulmonic valves, marking the end of systole. Thus the time period elapsing between the first heart sound and the second sound defines systole ventricular ejection and the time between the second sound and the following first sound defines diastole ventricular filling.

Please listen to an example of a normal heart sound:. An important fact for some, Spectra is owned and operated by women who are doctors, nurses, lactation consultants, and, most importantly, moms! Knowing that a woman helped to design and market this pump makes me feel better about buying it, since I know women will understand more about the needs of a pumping mom.

While there are few, they are significant. The big difference between the Spectra S1 and Spectra S2 breast pumps is that the the S1 has a rechargeable battery. This obviously makes it more portable than the S2 version. The leading alternative also has a rechargeable battery. The Spectra S1 does have a feature which the S2 lacks, it comes with a rechargeable battery. This means that you can pump anywhere. At a playdate in the park? At a baseball game?

Of course! On an airplane? Sure, why not! Just charge up the battery and you are good to go. If you are a pumping, working mom, this feature might be worth the extra cost. Also a good choice if you travel frequently, you can literally pump anywhere, no electricity needed.

The other major difference is price. The extra battery power that the S1 offers will cost you extra. Oh, and just so you know, the Spectra S1 is white and blue, while the S2 is white and pink. Not a big difference, but I wanted to let you know! You can only buy them in one color. I find that both the S1 and S2 are a great value for the cost. However, it may still be out of your range. If you are on a super tight budget and need a pump, you can pick up a basic hand pumps for less than a couple of cups of coffee.

So while I do agree that the Spectra pumps are worth the expense, the cost can be prohibitive for some. Some insurance companies offer basic pumps free through insurance, as well as the ability to pay the price difference between the basic pump and an upgraded pump.

Built-in Battery. Yes lasts 3 hours of pumping. Cycle Speed Control. Both single and double. Night Light. LCD Screen. Two years from date of purchase 90 days on pump parts. Spectra Baby Australia. I was using another one before this and I felt it wasn't powerful enough. The Spectra 2 has great power and is very comfortable. It's true what their motto says "our pumps don't suck they suckle!

Spectra and Medela are both top breast pump brands. The choice between Spectra and Medela really comes down to personal needs and preference.