Heart Rate Case Study

After further questioning you learn she is strictly following the fl uid and salt restriction ordered during

At the latter end of the p-q interval, atrial contraction occurs forcing additional blood into the ventricles. At the beginning of the QRS interval on an ECG reading, the mitral valve closes and the ventricles are at EDV (135ml). During the QRS interval, ventricular contraction occurs increasing the pressure in the ventricle and the aorta. When the pressure continues in the ventricle exceeds the pressure in the arteries, the aortic valve opens and blood is ejected. The increased pressure continues through the t peak. The ventricles are now in ESV (65ml) and the aortic valve is closed. Now the ventricles are relaxed causing pressure to fall and the cardiac cycle starts over again. This ECG reading was from a normal tracing. Keep in mind that an ECV is easy to obtain, but there are some subtleties that are very complex.

A heart rate monitor could have been used instead of the manual method, which would produce a more accurate result of the heart rate measurement. (http://www.topendsports.com/testing/heart-rate-measure.htm).

4) Compare and contrast oscillations in heart rate observed at rest (Activity 1), during exercise and recovery exercise (Activity 2). Is the relative magnitude of the oscillations the same? Provide a physiological explanation in your answer.

In addition a small rise in breathing rate and this is called anticipatory rise, this happens when exercising. The average reading for breaths per minute during exercise is 23-30. This shows that with more blood pumping through the body more oxygen is needed to keep the body at a sustainable rate to help our body create more energy. Our breathing rate will keep increasing until

TROPONINS – Markers of choice. Elevated between 4 and 6 hours after the onset of an acute MI and remains elevated for 8-12 days.

You need to explain to him the s/s of blood clotting (since he may have too low an INR d/t treatment and he needs to know this). Explain that his a-fib puts him at risk for blood clots.

The pulse rate increases each time due to the acknowledgment of the pulse and I therefore was able to get more accurate results.

The effects of heart rate on differing durations of exercise were studied in this experiment. For people, heart rate tends to increase as they perform physical exercises. The amount of beats per minute gradually increases as people perform physical activities. Heart rates taken before exercise are relatively low, and heart rates taken one minute after exercise increase significantly. Heart rates slowly begin to decrease after they are taken two minutes and three minutes after performing the step test, which is to be expected. The rates of intensity throughout exercise relates with changes in heart rate throughout the step test performed in the experiment (Karvonen 2012). The age of the participants affected the experiment, since the heart rate during physical exercise, in this case the step test, is affected by age (Tulppo 1998).

The right ventricle fills up  tricuspid valve closes  right ventricle contracts  pulmonary valve opens  the blood flows into the pulmonary artery  pulmonary valve closes  pulmonary artery splits into two vessels each going to the lungs.

The purpose of lab six, is demonstrate how different activities like exercise, postural changes, and cognitive thinking change arterial pressure as well as heart rate. Blood pressure, which is abbreviated as BP is the force that is placed onto vessel walls by the blood that it contains. In healthy individuals, BP should be 120/80 mmHg, but recent research has shown that healthy individuals BP should be lower than 120/80 mmHg. The first number, in this case 120 is known as the systolic number. The systolic number is known as the amount of pressure placed onto the vessel wall by blood during ventricular contraction. When someone is taking another persons blood pressure, this is the first sound that the person will hear. This is because the blood vessel opened up enough to allow blood to begin passing through. The second number, 80 represents the diastolic number. The diastolic number represents when the vessel is relaxing and blood is getting through without any extra force. Also, this number is represented by the last sound an individual hears in their stethoscope. Aside from BP, heart rate also known as pulse rate, is the number of times a persons heart beats in a minute. (Marieb & Hoehn, 2014, pp. 708-710).

The heart is able to do this thanks to the specialized cardiac muscle it contains. The contraction of the heart displays excitatory- contraction coupling (EC coupling) similar to skeletal muscles except the action potential in the heart originates spontaneously at the peace maker of the heart (Silverthorn, 2013). Contraction happens when a rapid depolarization occurs due to the influx and opening of sodium voltage gated channels to raise the membrane potential toward the threshold value causing a firing of action potential. The conduction and cardiac cycle starts at a resting distol state for both ventricles and atriums and is initiated with the depolarization at the SA node (Silverthorn, 2013). This causes an action potential which moves rapidly towards the AV node where the signal gets slowed down (Silverthorn, 2013).When the signal reaches this point it causes a contraction/systole stage of the right and left atriums. This causes blood to be pumped into the ventricles through the AV valves (Silverthorn, 2013). The action potential then travels to the ventricles down the bundle branches out towards the Purkinje fibers (Silverthorn, 2013). In terms of the cardiac cycle an isovolumetric contraction occurs during the pause of the signal at the AV node allowing the AV valves to close, followed by ventricular systole where the ventricles expel blood into circulation (Silverthorn, 2013). The final stage in the cardiac cycle occurs between stimulations of action potential when the ventricles and atriums are in diastole and the chambers fill with blood once again (Silverthorn,

5 minutes was given to the individual in between each trial so the heart rate was at its resting stage.

The atrial contraction is represented by the P wave. This is an upward, or positive wave of the line on the graph. The ventricular contraction is displayed by the QRS complex. The QRS

The cardiac cycle can be subdivided into two major phases, the systolic phase and the diastolic phase. Systole occurs when the ventricles of the heart contract. Accordingly, systole results in the highest pressures within the systemic and pulmonary circulatory systems. Diastole is the period between ventricular contractions when the right and left ventricles relax and fill.