Tessa Quinn
Hospital heart monitors can be intimidating, with their multi-coloured numbers and wavy lines, but they are essential for clinicians to quickly and efficiently evaluate patients' vital signs. The monitors collect real-time data, helping healthcare professionals identify signs of deterioration and reducing manual errors. While there are many different types of heart monitors, most work in the same way. Small sensors attached to the body carry information to the monitor, which is then displayed through numbers and waveforms. This data can include heart rate, blood pressure, body temperature, respiration rate, and oxygen saturation.
| Characteristics | Values |
|---|---|
| Heart Rate | Typically displayed using green numbers in the right corner of the screen. The number is identified with HR, RR, or ECG next to or above it. The normal resting heart rate is between 60-100 BPM for an adult. |
| Blood Pressure | Systolic (SYS/SYST) and diastolic (DIA/DIAS) blood pressure are displayed on the screen. Systolic blood pressure is between 90-120 mm Hg, and diastolic is between 60-80. An average BP is around 120/80. |
| Oxygen Saturation | Located under "SpO2" on the monitor, this measures the amount of oxygen in the patient's blood. A normal saturation level is 95% or greater, and it is measured on a scale up to 100. |
| Respiratory Rate | Reported in breaths per minute under "RR" on the monitor, with normal values between 12 and 20 for an adult at rest. |
| ECG Readout | Represents one lead, usually lead II, with electrodes attached to the patient's right arm and left leg. It records the electrical activity of the heart. |
| Respiratory Waveform | Useful for monitoring respiratory issues such as apnea or dyspnea. |
| SpO2 Waveform | Helps determine issues with circulation or peripheral perfusion. Each peak should correlate with a heartbeat. |
| CO2 Waveform | Visualizes the amount of CO2 a patient is exhaling. |
| IBP Waveform | Visualizes invasive blood pressure. |
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Heart rate
Hospital monitors are devices used to keep track of a patient's health in real-time. They measure vital signs like heart rate, blood pressure, breathing rate, and sometimes oxygen levels. The monitor displays this information on a screen, allowing doctors and nurses to quickly assess a patient's condition and detect any problems.
To measure heart rate, hospital monitors use sensors that detect the electrical signals produced by the heart. These sensors can be patches that stick to the skin or clips attached to a finger. Chest-strap devices are also common and are considered the most accurate as they directly measure heart rate rather than pulse rate. These sensors transmit information to the monitor, which then displays the heart rate in numbers and graphs.
In addition to the heart rate number, the monitor may also display waveforms, which are visual representations of the heart's electrical activity. The ECG waveform is usually the top wavy line on the monitor, and healthcare practitioners are trained to interpret these waveforms to assess the heart's functioning. Irregularities in the waveform can indicate issues such as arrhythmias or heart palpitations.
It is important to note that alarms on hospital monitors may go off due to factors other than clinical problems. For example, a loose or malfunctioning sensor may cause the alarm to sound. Additionally, vital signs may fluctuate due to factors such as fever or physical activity, so it is essential to consider the patient's overall condition and context before interpreting the heart rate data.
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Blood pressure
According to the latest guidelines, increases in systolic pressure are more consistently associated with increases in disease risk when compared with diastolic pressure. However, elevated diastolic pressure is also a risk factor for disease. For example, if you have a "normal" systolic pressure but "stage 1" diastolic hypertension, you would be diagnosed with stage 1 hypertension.
To measure blood pressure, a cuff is placed directly on the upper arm, which should be at heart level. The cuff inflates, and the result is the two numbers representing systolic and diastolic pressure. To ensure an accurate reading, it is important to prepare appropriately. This includes not smoking, consuming caffeine, or exercising within 30 minutes before taking the measurement. It is also recommended to use the bathroom and wear a short-sleeved shirt. When taking the measurement, the patient should sit with their back straight and supported, feet flat on the floor, and their arm supported on a flat surface. They should sit quietly for at least five minutes before the measurement.
Home blood pressure monitoring can be useful for people with high blood pressure or a family history of hypertension or heart disease. It can help determine whether treatments are working and confirm diagnoses. However, it is important to use a quality monitor, such as an automatic, cuff-style, upper-arm monitor, and to ensure the cuff fits correctly. Home monitoring should not replace regular doctor visits or adjustments to medication without consulting a healthcare professional.
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Oxygen saturation
Pulse oximeters are small, painless, and non-invasive devices that can be used to measure blood oxygen saturation. They can be clipped onto a fingertip, forehead, nose, foot, ear, or toe, and send beams of light through the tissues. The amount of oxygen in the tissue affects how well the light is absorbed. They are commonly used in hospitals and doctors' offices, and can also be prescribed or purchased for home use.
It is important to note that pulse oximeters may be less accurate for individuals with darker skin tones due to lower SpO2 readings. Other factors that can affect accuracy include poor circulation, cool skin temperature, tobacco use, and the presence of nail polish, long nails, or artificial nails. To ensure accurate readings, it is recommended to keep the hand warm and relaxed, with the fingernails clean, clipped, and polish-free, and to remain still during the measurement.
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Respiratory rate
The respiratory rate is typically identified by the abbreviation "RR" or "RESP" on the hospital monitor. It is often displayed in breaths per minute (bpm) and may be presented using a specific colour, such as yellow or white. The respiratory waveform, represented by a wavy line on the monitor, provides valuable information about the patient's breathing patterns. It helps clinicians monitor for any respiratory issues, such as apnea (sudden cessation of breathing) or dyspnea (difficulty in breathing).
While the hospital monitor provides real-time information about the patient's respiratory rate, it is important to note that the machine measurement of respiratory rate is generally unreliable. It is recommended to always measure respiratory rate manually, especially for patients who are not on a ventilator. Bedside nurses are a valuable resource for interpreting and adjusting monitor settings, and they can provide insights into the nuances of monitor usage.
In addition to the respiratory rate, the hospital monitor also displays other vital signs such as heart rate, blood pressure, and oxygen saturation levels. These parameters collectively provide a comprehensive overview of the patient's respiratory and cardiovascular status, enabling healthcare professionals to make informed decisions and interventions.
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Electrocardiogram (ECG)
An Electrocardiogram (ECG) is a simple, fast, and low-risk test used to evaluate the heart. It involves placing electrodes (small, plastic patches) on the skin of the chest, arms, and legs. These electrodes are connected to an ECG machine by lead wires and measure the electrical activity of the heart. This activity is then interpreted and printed out by the machine. The process is painless, and no electricity is sent into the body.
Before the test, you will be asked to remove any objects that may interfere with the ECG, such as jewellery. You will also need to remove clothing from the waist up and will be given a sheet or gown to wear. During the test, it is important to lie still and not talk to ensure accurate results. The technician will attach the electrodes and lead wires, and input identifying information about you into the machine's computer. The ECG tracing is completed quickly, after which the leads and electrodes are removed.
The ECG records the natural electrical impulses that coordinate the contractions of the heart, showing how fast it is beating, the rhythm of the beats, and the timing of the electrical impulses as they move through the heart. It is printed on graph paper, with each small box on the standard 25mm/s ECG paper representing 40 milliseconds of time on the x-axis and 0.1 millivolts on the y-axis.
ECGs are useful for detecting various heart-related conditions and are often used as a baseline for future comparisons. However, they may sometimes indicate problems that do not exist, leading to potential misdiagnosis and overtreatment.
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Frequently asked questions
The numbers on a hospital heart monitor represent the patient's pulse rate, body temperature, and blood pressure. The heart rate is usually displayed using green numbers in the top right corner of the screen. The body temperature is typically in the TEMP box, and blood pressure is expressed as a ratio with systolic blood pressure over diastolic blood pressure.
The waveforms provide visual information about the patient's respiratory, circulatory, and cardiac functions. The SpO2 waveform, for example, helps determine issues with circulation or peripheral perfusion, while the respiration waveform indicates the patient's breathing efficiency.
A normal resting adult has a heart rate between 60 and 100 beats per minute (bpm). Blood pressure readings should have systolic pressure between 90 and 130 and diastolic pressure between 60 and 80. Body temperature can vary, but a reading above 99 Fahrenheit indicates a fever, and below 95 Fahrenheit indicates hypothermia.
