Can what I eat help prevent future kidney stones? You may be able to prevent future kidney stones by making changes in how much sodium, animal protein, calcium, or oxalate you consume. A dietitian who specializes in kidney stone prevention can help you plan meals. You can make changes to what you eat based on the type of kidney stone you had.
Here are some simple steps on how to measure the PR interval: 1  Find the P-wave on the EKG strip. 2  Determine where the PR interval is, and to do this you start measuring at the beginning of the p-wave until the beginning of the QRS complex. 3  Count the SMALL boxes between there measurements.  Remember each box represents 0.04 seconds.
Standard ECG paper allows an approximate estimation of the heart rate (HR) from an ECG recording. 1  Each second of time is represented by 250 mm (5 large squares) along the horizontal axis. So if the number of large squares between each QRS complex is: 2  5 - the HR is 60 beats per minute. 3  3 - the HR is 100 per minute. 4  2 - the HR is 150 per minute.