1.1 Introduction
Monitoring (to monitor) is a term that involves the observation, actions, measuring, and understanding of many human activities in time. The origin of the word monitoring comes from the Latin monitor , -oris , derived from the verb monre (literally, to warn) and means a continuous or repeated observation, measurement, and evaluation of health and/or environmental or technical data for defined purposes, in accordance with predetermined programs in space and time. Monitoring can be implemented using comparable methods for the detection and collection of data []. The term originated in industrial environment, to indicate the continuous control of an operating machine, with appropriate instruments which measure some characteristic parameters (speed, consumption, production, etc.). The original meaning was later expanded: from the machine to the whole process, for an operational structure, and also human resources. Monitoring is widespread used in technical and in social sciences, with the general meaning of data collections significant for context.
Historically, monitoring started as a physiological measurement problem (Table ) and probably will end up as an overall assessment of intensive care unit (ICU) patient. This chapter has an introductory function for the first section: the concept of generality of instrumental monitoring, the monitoring carried out through applying scales at patients bed, to propose a new monitoring model for ICU patient.
Table 1.1
Short history of physiological data measurements []
When | Who | What |
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1625 | Santorio | Measurement of body temperature with spirit thermometer. Timing pulse with pendulum. Principles were established by Galileo. These results were ignored |
1707 | Sir John Foyer | Published pulse watch |
1852 | Ludwig Taube | Course of patients fever measurement. At this time temperature, pulse rate, and respiratory rate had become standard vital signs |
1896 | Scipione Riva-Rocci | Introduced the sphygmomanometer (blood pressure cuff) |
1900 | Nikolaj Sergeevi Korotkov | Applied the cuff with the stethoscope (developed by Rene LaennecFrench physician) to measure systolic and diastolic blood pressures |
1900 | Harvey Cushing | Applied routine blood pressure in operating rooms |
1903 | Willem Einthoven | Devised the string galvanometer to measure ECG (Nobel Prize 1924) |
19391945 | World War II: development of transducers |
19481950 | George Ludwig , Ian Donald , Douglass Howry , and Joseph Holmes | Pioneers of ultrasounds in health science |
1950 | The ICUs were established to meet the increasing demands for more acute and intensive care required by patients with complex disorders |
1953 | Danish patients with poliomyelitis received invasive mechanical ventilation |
1963 | Hughes W. Day | Reported that treatment of post-myocardial infarction patients in a coronary care unit reduced mortality by 60% |
1968 | Maloney | Suggested that having the nurse record vital signs every few hours was only to assure regular nurse-patient contact |
Early 1970s | Bedside monitors built around bouncing balls or conventional oscilloscope |
1972 | Takuo Aoyagi | Developed a pulse oximeter based on the ratio of red to infrared light absorption in blood. After obtained an US patent, oximetry became clinically feasible |
1973 | Jeremy Swan and William Ganz | Pulmonary artery balloon flotation catheter starts advanced hemodynamic study |
1990s | Computer-based patient monitors; systems with database functions, report-generation systems, and some decision-making capabilities |
ICUs are very different, such as medical and surgical wards, because of different staff availability (especially nurses) and expertise, skills, technologies, and environments. Monitoring activity involves the entire ICU staff (nurses, physician, respiratory therapists and rehabilitation therapists, dietitians) and is based on different operational models implemented in several countries around the world. Nurses, wherever present 24 h a day, often act as liaison between the various staff components, ensuring security, continuity, and harmony and coordinating and communicating all aspects of treatment and care the patient needs. Nurses also provide continuous monitoring and caring for patients and equipment and for their interactions [].
1.2 Instrumental Monitoring
Technology is extremely pervasive and is continuously increasing in ICU. It is commonly used in a multitude of tools for monitoring and supporting patients vital functions: the brain, lung, heart, and kidney. The widespread use of electronic monitoring and support to vital function has probably helped to prevent errors and to improve outcomes [].
The monitoring tools are able to detect multiple parameters, such as continuous electrocardiogram (ECG), end-tidal carbon dioxide (EtCO)2, various measurements of peripheral oxygen saturation (SpO2), cardiac output, and intracranial and cerebral perfusion pressure. The supporting devices can affect the respiratory system (noninvasive mechanical ventilation), circulatory (pacemakers, intra-aortic balloon pump, ventricular devices), cardiorespiratory (extracorporeal membrane oxygenationECMO), and kidney (continuous renal replacement therapy (CRRT) and slow low-efficiency daily dialysis (SLEDD)). All these supporting systems contextually also provide monitoring parameters (e.g., the ventilator). Understanding the functions of the devices commonly used in ICU can help in caring for patients in critical conditions [].
The monitoring technique in intensive care has risks and benefits. Intensive monitoring provides a high data value and information, but it can increase some risks of complications. For example, intensive monitoring could be useful in acute medical interventions aiming to maintain the essential variables within a narrow physiological range and improve the outcome in people with acute stroke [).