What causes a pulse oximeter to show fluctuating heart rate readings, sometimes high and sometimes low?

Apr 15, 2023 Source: Cainiu Health

Dr. Tian Hongbo

Introduction

An oximeter showing fluctuating heart rate readings may be due to device malfunction or improper measurement technique, which affects the accuracy of results. It could also result from arrhythmia caused by myocardial ischemia, or impaired cardiac systolic and diastolic function, which disrupts normal blood flow and leads to irregular heartbeat. Besides these common causes, respiratory failure and other conditions cannot be ruled out as potential reasons.

Blood oxygen monitor readings showing fluctuating heart rates may be due to physiological factors, or could result from pathological conditions such as severe anemia or heart failure. The specific analysis is as follows:

I. Physiological Factors

If the device is malfunctioning or if measurement techniques are incorrect, this may affect the accuracy of results, leading to fluctuating readings. It is recommended to replace the device and take measurements again.

II. Pathological Conditions

1. Severe Anemia

In cases of severe anemia, myocardial ischemia may lead to arrhythmia, causing the heart rate to fluctuate during instrument measurement. This can be alleviated through dietary improvements, blood transfusion therapy, or taking ferrous sulfate syrup or ferrous fumarate tablets as prescribed.

2. Heart Failure

Impaired cardiac systolic and diastolic function can disrupt normal blood flow, resulting in irregular heartbeat. Medications such as enteric-coated aspirin tablets, triamterene tablets, or atorvastatin calcium tablets may be used as directed by a physician to relieve symptoms.

In addition to the above common causes, respiratory failure and other conditions cannot be ruled out. Timely examinations such as electrocardiogram (ECG) or CT scans are necessary for accurate diagnosis.

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Methods for self-measuring blood oxygen

In general, the most commonly used method for self-measuring blood oxygen levels currently is using a pulse oximeter. A pulse oximeter is a basic medical device that can monitor pulse rate, blood oxygen saturation, and perfusion index. The specific operating steps are as follows: 1. Remain emotionally stable before measurement and ensure your hands are warm. 2. Keep your hand, the pulse oximeter, and your heart at the same level.

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How many minutes should a blood oxygen monitor be used to measure?

Under normal circumstances, a pulse oximeter should be used for about half a minute, and it is recommended to perform the measurement under a doctor's guidance to help reduce measurement errors. A pulse oximeter is a medical device used to measure blood oxygen saturation and pulse rate. Typically, the measurement takes about 30 seconds and uses optical technology to detect the level of oxygen in the blood, providing immediate results.