Hailey Tran
Non-invasive blood pressure (NBP) monitoring is a standard of care in inpatient and outpatient surgeries. NBP is also known as ambulatory blood pressure monitoring (ABPM) and is considered the gold standard for monitoring nocturnal blood pressure (NBP). Nocturnal blood pressure is important for predicting mortality and morbidity related to blood pressure. NBP is also crucial in managing abnormal blood pressure and blood pressure morning surge. NIBP recording for cardiovascular research allows for the continuous measurement and recording of arterial pressure through a hand-based cuff.
| Characteristics | Values |
|---|---|
| Full Form | Non-invasive Blood Pressure |
| Type of blood pressure | Nocturnal Blood Pressure |
| Measurement technique | Fully automatic monitoring |
| Importance | Helpful in controlling abnormal BP |
| Monitoring method | Ambulatory BP monitoring (ABPM) |
| Measurement device | Sphygmomanometer |
| Measurement procedure | Measurements taken at 22:00, 02:00, 06:00, 10:00, 14:00 and 18:00 h |
| Comparison with ABPM | All-day, daytime and night-time BP did not differ significantly from 24-hour ambulatory systolic BP |
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What You'll Learn
Non-invasive blood pressure monitoring
Non-invasive blood pressure (NBP) monitoring is a standard method of measuring blood pressure in hospitals. It is a safe and convenient alternative to invasive blood pressure monitoring, which can be painful, time-consuming, and carry a risk of complications. NBP monitoring does not require cannulation and instead uses an upper-arm cuff or finger cuff technologies.
NBP monitoring is typically intermittent, with a frequency of no more than one measurement every 5 minutes, due to patient discomfort and the risk of skin and nerve damage. This intermittent nature, however, can increase the risk of late recognition and delayed correction of hypotensive episodes.
Continuous non-invasive blood pressure monitoring is an emerging technology that can provide real-time, beat-to-beat blood pressure measurements without any interruptions. This is achieved through techniques such as arterial applanation tonometry and volume clamp techniques (also known as vascular unloading techniques or finger cuff technologies). These techniques use inflatable cuffs and photoplethysmographic (PPG) absorbance to measure arterial expansion and blood volume changes, which are then transformed into pressure readings.
The accuracy of continuous non-invasive blood pressure devices is an important consideration for clinical decision-making. While these devices provide continuous measurements, there can be substantial differences in blood pressure readings when compared to invasive monitoring methods. Therefore, clinicians must be aware of the range of uncertainty associated with these devices.
Recent advances in non-invasive blood pressure monitoring include the development of algorithm-based blood pressure sensors that utilize machine learning techniques to extract blood pressure values from the shape of the pulse waveform. These advancements aim to improve the accuracy and convenience of NBP monitoring, making it an even more valuable tool in hospitals and communities for the diagnosis and treatment of various medical conditions.
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Nocturnal blood pressure
During the night, an individual's blood pressure should decrease by 10% to 20%, and promptly increase again upon waking. However, certain abnormal variations may occur, such as an extreme dip of more than 20%, a minimal dip of less than 10%reversal, where blood pressure rises instead of falling. These abnormal patterns are associated with greater cardiovascular and cerebrovascular disease risks.
Nocturnal hypertension, or high blood pressure during sleep, can lead to severe health complications, including heart attack, stroke, and kidney failure. It may be asymptomatic, but symptoms can include frequent waking to urinate, sleep apnea, and difficulty breathing. Risk factors include diabetes, kidney disease, stress, high salt intake, and a sedentary lifestyle.
Diagnosing nocturnal hypertension can be challenging because it occurs when individuals are at home and asleep. To obtain an accurate diagnosis, a person may need to wear an ambulatory blood pressure monitoring cuff overnight, which will test and monitor their blood pressure throughout the night. This information can then be used to inform treatment decisions, which may include blood pressure medications and lifestyle changes, such as increased physical activity and a healthier diet.
The management of NBP is crucial in controlling abnormal blood pressure and preventing associated health complications. While there are limitations to current monitoring methods, such as indirect intermittent ABPM, the recognition of the importance of NBP has led to a focus on improving measurement techniques and understanding abnormal NBP patterns, diagnostic thresholds, and effective management strategies.
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Intermittent, non-invasive blood pressure
Non-invasive blood pressure (NBP) monitoring is the standard of care in all inpatient and outpatient surgeries. It provides either intermittent or continuous readings. Intermittent non-invasive blood pressure monitoring is usually sufficient for stable, low-risk patients. It is typically measured using non-invasive oscillometric devices every 3 to 5 minutes. This method can potentially lead to unrecognised periods of hypotension.
Intermittent non-invasive blood pressure monitoring can be performed manually or automatically. For manual measurement, an inflatable cuff is wrapped around the upper arm of a patient, and the manometer connected to the cuff by a tube shows the pressure applied. For automatic measurement, an occluding upper arm cuff is used, and BP values are obtained by oscillometry.
Intermittent non-invasive blood pressure monitoring is generally safer and more reliable than invasive arterial blood pressure monitoring. However, due to its discontinuous character, dangerous hypotensive episodes might be missed. For instance, in women undergoing Caesarean sections, CNAP detected hypotensive phases in 39% of cases, whereas only 9% were detected by the standard NBP.
Continuous non-invasive blood pressure monitoring techniques became available in recent years, enabling a real-time BP curve and numerical BP values to be assessed. Continuous monitoring allows for the early detection of hypotension, which may lead to timely treatment. It is recommended for patients at lower risk.
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Continuous noninvasive arterial pressure
CNAP technology from the Austrian group obtains a standard NBP measurement at the beginning of the measurement. An individual transfer function from finger to upper arm is then calculated and applied to the CNAP signal. This allows for the detection of hemodynamic instabilities and provides insight into the hemodynamic control function and fluid management.
The evaluation of Pulse Pressure Variation (PPV) allows for goal-directed fluid management in sedated and ventilated patients. The mathematical analysis of CNAP pulse waves also enables the non-invasive estimation of stroke volume and cardiac output. This can lead to lower rates of morbidity and mortality in moderate and high-risk surgical procedures.
CNAP2GO is a novel method of continuous noninvasive blood pressure measurement that is based on the volume control technique (VCT). It performs blood volume control more slowly, allowing for the use of small-scale hardware that does not require a pump or valve. CNAP2GO can be used with two-finger rings on contralateral hands or a double finger sensor on the same hand.
In summary, continuous noninvasive arterial pressure (CNAP) is a valuable tool for measuring beat-to-beat arterial blood pressure in real time without interruptions or cannulation. It combines the advantages of continuous and invasive blood pressure measurement methods, providing valuable insights into hemodynamic optimization and fluid management. CNAP2GO is a recent innovation that offers a slower and more controlled approach to continuous noninvasive blood pressure measurement.
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Calibration to the non-invasive gold standard
Non-invasive blood pressure (NBP) monitoring is the standard of care for all inpatient and outpatient surgeries except in 15% to 18% of inpatient surgeries where blood pressure is measured continuously with invasive catheters (IBP). NBP monitoring is intermittent and, as such, dangerous hypotensive episodes might be missed.
Continuous non-invasive arterial pressure (CNAP) is a method of measuring beat-to-beat arterial blood pressure in real time without any interruptions and without cannulating the human body. CNAP combines the advantages of the two clinical "gold standards": it measures blood pressure continuously in real time like the invasive arterial catheter system (IBP) and it is non-invasive like the standard upper arm sphygmomanometer (NBP).
Calibration to the non-invasive "gold standard" NBP is performed in most devices currently marketed, although the calibration methods differ. The CNAP technology from the Austrian group obtains a standard NBP measurement at the beginning of the measurement. An individual transfer function from finger to upper arm is then calculated and applied to the CNAP signal. All Finapres successor devices apply a global transfer function for finger-to-brachial values.
PhysioCal is used in Finapres and its successor devices. The PhysioCal algorithm eliminates changes in the tone of smooth muscles in the arterial wall, haematocrit, and other finger volume changes during measurement periods of constant pressure. PhysioCal is achieved by opening the Vascular Unloading feedback loop. A new pressure ramp search is then performed before the measurement starts again. This algorithm needs to interrupt the blood pressure tracings for recalibration purposes, which results in short data loss during that time.
For other methods like PTT, a closed-meshed recalibration to NBP can overcome vasomotor changes. The overall accuracy of CNAP devices has been demonstrated in comparison with the current gold standard invasive blood pressure (IBP) monitoring in numerous studies during the last few years.
Accurate continuous non-invasive blood pressure (CNIBP) monitoring is the holy grail of digital medicine but remains elusive largely due to significant drifts in signal and motion artifacts that necessitate frequent device recalibration. To address these challenges, a novel intra-beat biomarker (Diastolic Transit Time, DTT) was developed to achieve highly accurate blood pressure (BP) estimations. This approach demonstrated superior performance compared to other common signal processing techniques in eliminating stochastic baseline wander, while maintaining signal integrity and measurement accuracy, even during significant hemodynamic changes. This new algorithm was applied to BP data collected using non-invasive sensors from a diverse cohort of high-acuity patients and demonstrated close agreement with the gold standard invasive arterial line BP measurements for up to 20 minutes without recalibration.
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Frequently asked questions
NBP stands for Non-Invasive Blood Pressure.
NBP is measured using a finger-based oscillometric blood pressure cuff. This cuff is comfortable and easy to use, and can be worn on the hand or upper arm.
IBP stands for Invasive Blood Pressure and involves cannulating the human body. NBP does not require this invasive procedure.
NBP is used to monitor blood pressure over long periods of time, without causing discomfort to the patient. This can be useful for both inpatients and outpatients.
