1. Cardio Pulmonary Resuscitation

2. Ratio and Rate We use these terms in CPR but they have their origin in mathematics. Ratio a comparison of two quantities Teachers to student = 1 to 25 or 1:25 or 1 25 Rate a comparison by ratio of two different units Miles per hour, miles per gallon Can you think of any rates?

3. Determine Ratios and Rates Determine the ratio of boys to girls in your classroom Each of you should now check your own pulse rate

4. CPR Compression Rates All age groups require the compression rate of 100 compressions per minute

5. Compression : Breathes Ratio The ratio of 30 compressions : 2 breaths breaks the rhythm of CPR much like a stoplight interrupts the driving rate (speed) on your way to school. The goal of the American Heart Association is to complete 5 cycles of 30:2 in 2 minutes.

6. A Little Math in CPR How many compressions are you actually performing in this 2 minute period? CompressionsBreathes Cycle#Time (sec)# 1302028 2302028 3302028 4302028 5302028

7. A Little Math in CPR Total compressions = 150 Total compression time = 100 seconds Total breathes = 10 Total breathing time = 40 seconds Total Time = 140 seconds

8. It doesn’t add up!!! 30 x 5 = 150 and 150 compressions in 2 minutes is not equivalent to 100 compressions in 1 minute. This is because we are not actually doing compressions continuously for the full 2 minutes.

9. Let’s Integrate! Jane’s mom drives her to school every day; it is approximately 2 miles. On Tuesday, Jane decided to keep track of her mom’s driving time and “pausing” time (at stop lights) in seconds.

10. Let’s Integrate! She found the following: Driveway to first stop light 52 secs Time at first stop light 23 secs First stop light to second stoplight 12 secs Time at second stop light 9 secs second stop light to third stoplight 15 secs Time at third stop light 22 secs third stop light to fourth stoplight 37 secs Time at fourth stop light 26 secs fourth stop light to school 44 secs

11. How long did it take Jane to get to school on Tuesday?

12. Calculate the average speed of Jane’s car.

13. Let’s think… On Wednesday, Jane’s mom made it to school in 160 seconds (2 minutes and 40 seconds). If she maintained an average rate of approximately 45 mph (the same as Tuesday), what could explain the difference in times?

14. The take-home message The rate doesn’t change!

15. CPR at its Best Consistent compressions of 100 per minute Smooth transitions to breathing