When an ectopic pacemaker initiates a beat, premature contraction occurs.

But one notable difference between the groups was that the residents had a higher rate of premature contractions that required bed rest or hospitalization.

She was conscientious, monitoring her uterus for premature contractions, taking drugs to stop preterm labor, staying in bed.

But premature contractions returned, despite additional lidocaine.

There were no premature contractions.

It is often associated with factors that affect the electrical signal for contraction and trigger a premature contraction before complete relaxation.

Pre-excitation syndrome is a condition where the ventricles of the heart become depolarized too early, which leads to their partial premature contraction.

Women may present with vaginal bleeding, abdominal or back pain, abnormal or premature contractions, fetal distress or death.

The concealed form is characterized by an asymptomatic dog with ventricular premature contractions (VPCs).

The enhanced automaticity means that the ectopic centre fires more regularly than usual and is protected from depolarisation that results in premature contractions.

After carrying the children for 21 weeks, Mrs. Utti suffered from premature contractions and had to spend six weeks at Kings County Hospital.

These preparations are mediated by the hormone progesterone, which prevents premature contractions and bleeding so that the uterus can build up a place for the embryo to grow.

"This has to be the same problem that they had in the OR," said Bellows, watching the premature contractions increase in frequency until the rhythm dissolved into fibrillation.

"How about premature contractions such as auricular, nodal, and ventricular, auricular tachycardia, auricular flutter, auricular fibrillation, not to mention night cramps?"

A premature contraction will not follow the normal signal transduction pathway, and can render the heart refractory or incapable of transmitting the normal signal from the SA node.

Experts on multiple births say some of the pregnancies falter because some doctors fail to treat them as high-risk cases needing specialists, and some women are not counseled about bed rest, nutrition and monitoring for premature contractions.

Having infections detected and treated, if necessary, can help diminish the risk of premature rupture of the membranes, premature contractions and a preterm birth, although no treatment has yet stemmed the effect of bacterial vaginosis.

They are likely to have "flip flopping" sensations where it feels like the heart is flipping over or pounding due to there being a pause after the premature contraction and then a powerful contraction after the pause.

An example of ventricular premature contraction without pathology is the classic athletic heart syndrome: the sustained training induces a cardiac adaptation in a way that at rest, the SAN rate is slower (sometimes around 40/min) and gives time to some ventricular cells to spontaneously reach the threshold potential (-40mV) and depolarize.