Part 1: Valsalva maneuver Follow the procedures below. Save all data and make notes on experimental observations and questions asked. Place some gel on your wrist and obtain a signal for arterial blood flow. Observe the signal. Perform a Valsalva maneuver, which is a forceful exhalation against a closed glottis. The increased pressure that develops within the thorax decreases venous return and increases heart rate. Use a watch and record the change in heart rate over 10 seconds (deliverable). Occlude blood flow by pressing your finger on the artery inside your elbow. Observe and record the resulting signal (deliverable). Part 2: Heart Valve Motion Detection Position over the mitral valve (about 5 cm under left nipple between the ribs via the intercostal muscles). Listen to the motion of the mitral valve. Move the transducer so it is over a rib, then between ribs. What happens? Why do you suppose this happens (deliverable)? Part 3: Measuring Infusion Pump/Gravity Feed Flow Fill cup with fluid (i.e., water, milk, soda, etc.) Feed tubing through infusion pump and set the pump to flow at a velocity of your choosing. (If you are using gravity feed bag on an IV rack, fill the bag with distilled water and clamp off flow with tube clamp until you are ready to measure.) Apply acoustic gel to the transducer and place in a fixed position over tubing. Point in various directions to detect the best fluid flow sound. Listen to the motion of the fluid. How does this differ from the artery sounds? Is the sound smooth or pulsed? What would account for this (deliverables)?
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