Sentence:  During a short cycle or premature contraction, LV ejection begins before pressure in the aorta has completely decreased, and it remains higher than with longer <WSD>diastoles</WSD> [4, 5]. 
Meaning of the word marked with <WSD> tags:  The phase or process of relaxation and dilation of the heart chambers, between contractions, during which they fill with blood; an instance of the process.