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HRV Reading Guide

HRV Reading Guide. Reading Basic Guide & CASES. < HRV Reading Guide>. 1 st , HR / SDNN 2 nd , TP / LF / HF 3 rd , LF / HF ratio 4 th , Stress Index. SDNN (Standard Deviation NN or RR interval) : Representative parameter that shows the Heart Rate variable status

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HRV Reading Guide

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  1. HRV Reading Guide Reading Basic Guide & CASES

  2. < HRV Reading Guide> • 1st, HR / SDNN • 2nd, TP / LF / HF • 3rd, LF / HF ratio • 4th, Stress Index

  3. SDNN (Standard Deviation NN or RR interval) • : Representative parameter that shows the Heart Rate • variable status • : Most important indicator of Autonomic Nerve function • evaluation • : Ex) Although ANS balance is good, it is evaluated as • the lowering activity of ANS and excessive stress state • if SDNN is still lowering level. • Lowering in SDNN • -Drop the function of ANS • Drop the function of body regulation • Lower in stress resistance • Lower in general health status

  4. <Graph with the Heart Rate Variability> Please explain with SDNN parameter.

  5. 2. Frequency Domain - TP / LF/ HF : Evaluate the activity of SNS, PNS, ANS compared with age, gender and normal reference. : It may not be visible for SNS or PNS dominant clearly because it is compared with the normal reference. Check this evaluation at the ratio rate. : Ex) ANS activity is lowered by the stress, and SNS is highly dominant. 1. Check if SNS and PNS are below the normal. 2. SNS is higher than PNS when compared with each. -> Express the rate as SNS : PNS.

  6. 2. Frequency Domain - TP / LF/ HF

  7. 3. LF / HF Ratio Clarify the balance of SNS and PNS “ Autonomic Nerve System……. ? Parasympathetic Nerve System Sympathetic Nerve System ANS • It is changing continuously. • ▶ Only with SNS/PNS rate, it is not arguable. • 2. If the central axis is rusted, the seesaw doesn’t move. • ▶ Check the SDNN parameter. • 3. Therefore, if SDNN is lowered, it is not activating in seesaw. • ▶ Currently, if SNS/PNS has a balance, but it causes problems.

  8. 3. LF / HF Ratio ▣ SNS:PNS = 6 : 4 (Best) ( In a healthy, it can be variable of SNS and PNS by a constant emotion. If one of them is not mostly higher, it is not saying that the balance is broken.) KEY POINT

  9. 4. Check Stress Index Evaluate the stress level ▣ Pressure Index : -> Based on mean HR , SDNN activity, it is calculated the Pressure for Regulation System. As much as distance from the Normal, the stress level is getting worse. ▣ Emotional State : Decide by the balance of SNS & PNS High – Anxiety, Irritation, Nervous, Panic, Distractable, Hyper-arousal Low – Slow mental speed, Hypo-arousal, Lethargy, Chronic Neurasthenia

  10. 5. Be noticed while reading the report! - Check the Tachogram at the beginning stage • CASE #1. Respiration Control • SDNN,TP,LF,HF ,PSI = All normal • However, SNS in ANS balance is excessively high. It can be possible to show as the balance is broken instantly by the stress. You may measure the test again. • Throughout the respiration control with HRV Tachogram, it is seen that HR is changing in a regular pattern. • In this case, the change of respiration influences the HR and it is not easy to get the correct data. • (If the HR is changing by the respiration control, it will be getting a better result.) • Take a test again while the position is stable.

  11. CASE #2. Abnormal HR in high quantity • Before evaluation, should be known as Tachogram is abnormal. It can be happening this result when she talked or moved, but also when she may have an arrhythmia. • It will be necessary to measure the test again for the analysis in detail. • Did the patient move or talk during the measurement? • Was the sensor working properly? • Was there any similar signal as like arrhythmia? • In case of 3), it will be necessary to get consultation with a doctor.

  12. # CASE 8 CASE #3. Bronchial Asthma, allergy It is found that tachogram of HRV is changing regularly, but its range is big. In this case of patients, it is normal pattern that those who have bronchial asthma or allergy have the similar tachogram and also if the patient has a respiration control as inhaling or exhaling.

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