BP Management System User Acceptance Testing

Not Applicable

Completed

Conditions: Hypotension and Shock

Registration Number: NCT04688450

Lead Sponsor: Andrew Tomas Reisner

Brief Summary: This is a feasibility study for an investigational clinical decision support system ("the System") intended to optimize the management of blood pressure (BP) for patients during vasopressor infusion. The investigational outcomes are the perceptions of the nurse-subjects who are managing the BP of the patient-subjects; the operational performance of the System; and any technical failures of the software during real-time operation.

Detailed Description: This is a feasibility study for an investigational clinical decision support system ("the System") intended to optimize the management of blood pressure (BP) for patients during vasopressor infusion. Enrollment is planned of a convenience sample of 20 individual patient-subjects and also the 20 nurse-subjects who correspond to the primary nurses managing the patient-subjects. Consent will be obtained by the investigative team from the patient-subject (or close family member or healthcare proxy) and from the nurse-subject. The nurse will receive training in the intended use and important limitations of the System. The System will be deployed to the patient's bedside and the System will be initiated. This intervention will continue for a duration of between 4 to 8 hours. A Technical Observer ("TO") will be present to continually oversee the operation of the System, watching to ensure that there are no observable technical failures. The TO will also watch to see if any early termination conditions are met (specifically any concerns by the clinical staff or the patient or the patient's family; any observed technical operational problems; maximum dose vasopressors or hypoxia despite maximum respiratory support; or unplanned bedside response by the clinical care team) and also will make annotations about the exact time that specific clinical interventions are performed. After the intervention, the nurse-subject will be surveyed. Prior to enrollment of a subsequent subject, additional data analysis -- sufficient to identify or exclude any early stoppage condition -- will be performed on the System's archived electronic data and log files. Any adverse events will be reported to the IRB and the FDA as per FDA and institutional policy.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 20

Inclusion Criteria

Adult patient (18 years or older) receiving continuous vasopressor infusion to maintain blood pressure;
Clinician treating patient estimates future duration of vasopressor infusion likely at least 4 additional hours;
Provider order has been made that sets lower limit for mean arterial pressure;
Indwelling arterial catheter has been placed for continuous blood pressure monitoring.

Exclusion Criteria

Lack of consent or at the discretion of the patient's primary nurse;
The discretion of any of the patient's other clinical providers;
People who do not speak English will be excluded. The rationale is that this protocol involves the bedside deployment of an investigational system plus longitudinal observation. Our mitigation for psychosocial risk involves a continual observer who can monitor for any evidence of subject psychosocial discomfort, which involves the ability to effectively communicate with the subject throughout the duration of the protocol. This therefore excludes patients who do not speak English.
Patients who are on two simultaneous vasopressors running at maximum doses (per the ICUs own protocols) or who is on one maximum-dose vasopressor and has a contraindication to receiving a second vasopressor (e.g., insufficient vascular access).
Patients who are hypoxic (SpO2 < 90%) despite maximum inspired oxygen (100% for patients receiving mechanical ventilation, or 10L high-flow in patients who are not candidates for mechanical ventilation).
Provider order has been made that sets lower limit for SBP (because our system does not have the capability to provide decision-support for an SBP lower limit).
Enhanced respiratory precautions for COVID.

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Primary Outcome Measures

Name	Time	Method
Quantitative Nurse-subject Survey Response	Up to 8 hours	Nurse-subject quantitative survey response (yes/no) about any confusion or perceived inaccuracies of the system; perceived risk of patient management error; or perceived distraction that impacted care delivery
Software Operation (Based on Real-time Observation)	Up to 8 hours	System malfunction (yes/no) observed in real-time by the Technical Observer
Data Completeness	Up to 8 hours	Completeness (yes/no) of flowsheet (data archive of the investigational System) without any lapses in input data from the bedside monitor during connectivity; and without lapses in associated BP forecasts.
Software Operation (Based on Review of Error Logs)	Up to 8 hours	Error-level and critical-level software errors in the runtime log (yes/no)

Secondary Outcome Measures

Name	Time	Method
Percentage of Time That the BP Forecast is Operative (Outcome 2.1)	up to 8 hours	Median percentage (%) of time, per patient, during the session when inclusion criteria were otherwise met that the BP forecast was operative (i.e., time intervals when no InOp criteria detected by the System leading to the InOp state)
Accuracy of the MAP Forecast (Outcome 2.2)	Up to 8 hours	Accuracy of the future 20 min median MAP forecast (average error between the MAP forecast and the future 20 min median MAP; for purposes of computing future 20 min median MAP, MAP \< 10 mmHg and MAP \> 250 mmHg is treated as a missing number) over time intervals during the session when inclusion criteria were otherwise met; the BP forecast was operative; and the analysis window criteria were met \[at least 19 minutes remaining to the end of the record from the time of the forecast; and the analysis window has no more than 9 min of non-physiological MAP data (non-physiological MAP criteria are MAP \< 10mmHg or MAP \> 250mmHg or 'NaN')\].
Percentage of Time That the True Future 20 Min Median MAP Falls Within the Forecast Cone (Outcome 2.3)	Up to 8 hours	Median percentage (%) of time, per patient, that the true future 20 min median MAP falls within the computed forecast cone over time intervals during the session when inclusion criteria were otherwise met; the BP forecast was operative; and the analysis window criteria were met \[at least 19 minutes remaining to the end of the record from the time of the forecast; and the analysis window has no more than 9 min of non-physiological MAP data (non-physiological MAP criteria are MAP \< 10mmHg or MAP \> 250mmHg or 'NaN')\]
AWTs for SHEs Predicted by {Index > User's Index Threshold Setting} After Continuous Hypotension Onset (Outcome 3.4.4)	Up to 8 hours	AWTs for SHEs predicted by an SHE-contiguous notification event (i.e., Index \> user's Index threshold setting) after onset of continuous hypotension. NOTE: A positive AWT denotes a notification event that occurs chronologically in advance of the onset of the SHE event. For example, an AWT of +3 would mean the first notification event occurred 3 minutes before the onset of the SHE event.
Percentage of Total SHEs With False Resolutions (Outcome 3.5.1)	Up to 8 hours	Percentage of total SHEs with false resolutions \[i.e., MAP \>= goal transiently during SHE\]
Percentage of Total SHEs Predicted by {Index > 35%} Prior to Earliest Hypotension (Outcome 3.2.1)	Up to 8 hours	Percentage (%) of total SHEs predicted by an SHE-contiguous notification event (i.e., Index \> 35%) prior to the SHE's earliest hypotension \[hypotension is defined as MAP \< goal, with the exclusion of MAP \< 10 mmHg, which is treated as a missing number\]. Notification events are intervals that begin when there is an Index value that meets the notification criteria and terminate when there is an Index value output that does not meet the notification criteria.
Percentage of Total SHEs Predicted by {Index > User's Index Threshold Setting} Prior to Earliest Hypotension (Outcome 3.2.3)	Up to 8 hours	Percentage (%) of total SHEs predicted by an SHE-contiguous notification event (i.e., Index \> user's Index threshold setting) prior to the SHE's earliest hypotension \[i.e., MAP \< goal\]
Percentage of Total SHE False Resolutions Detected by {Index > User's Index Threshold Setting} (Outcome 3.5.5)	Up to 8 hours	Percentage (%) of total SHE false resolutions with a contiguous notification event where {Index \> user's Index threshold setting}
Percentage of Total SHE False Resolutions Not Detected by {Index > User's Index Threshold Setting} With InOp State During False Resolution (Outcome 3.5.6)	Up to 8 hours	Percentage (%) of total SHE false resolutions that were not detected by {Index \> user's Index threshold setting} and had InOp state occurring during the index false resolution episode
Incidence of Notification Events {Index > User's Index Threshold Setting} That Are Sentinel Notifications (Outcome 3.6.4)	Up to 8 hours	Incidence of notification events {Index \> user's Index threshold setting} that are sentinel notifications, excluding notification events with onset during an SHE. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > User's Index Threshold Setting} That Are False Notifications (Outcome 3.6.6)	Up to 8 hours	Incidence of notification events {Index \> user's Index threshold setting} that are false notifications. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
AWTs for Stuttering Hypotension Episodes Detected by {Index > 35%} Prior to the Stuttering Hypotension's First Hypotension (Outcome 3.7.3)	Up to 8 hours	AWTs for stuttering hypotension episodes detected by {Index \> 35%} prior to the stuttering hypotension's first hypotension. NOTE: A positive AWT denotes a notification event that occurs chronologically in advance of the onset of the SHE event. For example, an AWT of +3 would mean the first notification event occurred 3 minutes before the onset of the SHE event.
Percentage of Total Stuttering Hypotension Episodes Detected by {Index > User's Index Threshold Setting} Prior to the Stuttering Hypotension's First Hypotension (Outcome 3.7.4)	Up to 8 hours	Percentage (%) of total stuttering hypotension episodes detected by {Index \> user's Index threshold setting} prior to the stuttering hypotension's first hypotension
AWTs for Stuttering Hypotension Episodes Detected by {Index > User's Index Threshold Setting} Prior to the Stuttering Hypotension's First Hypotension (Outcome 3.7.5)	Up to 8 hours	AWTs for stuttering hypotension episodes detected by {Index \> user's Index threshold setting} prior to the stuttering hypotension's first hypotension. NOTE: A positive AWT denotes a notification event that occurs chronologically in advance of the onset of the SHE event. For example, an AWT of +3 would mean the first notification event occurred 3 minutes before the onset of the SHE event.
Percentage of Total Stuttering Hypotension Episodes Detected by {Index > 35%} Prior to 10 Cumulative Min of Hypotension (Outcome 3.7.6)	Up to 8 hours	Percentage (%) of total stuttering hypotension episodes detected by {Index \> 35%} prior to the occurrence of 10 cumulative minutes of hypotension within that stuttering hypotension episode (excluding episodes detected prior to first hypotension)
AWTs for Stuttering Hypotension Episodes Detected by {Index > 35%} Prior to 10 Cumulative Min of Hypotension (Outcome 3.7.7)	Up to 8 hours	AWTs for stuttering hypotension episodes detected by {Index \> 35%} prior to 10 cumulative min of hypotension. NOTE: A positive AWT denotes a notification event that occurs chronologically in advance of the onset of the SHE event. For example, an AWT of +3 would mean the first notification event occurred 3 minutes before the onset of the SHE event.
SHE Incidence (Outcome 3.1)	Up to 8 hours	SHE incidence per 24 hrs \[Sustained hypotensive event "SHE" is any interval commencing upon MAP \< goal \& 20-min future median MAP is also \< goal; terminating upon time point when MAP \>= goal and \& 20-min future median MAP \>= goal; SHEs occurring sequentially within 10 min are merged; any remaining SHEs not persisting at least 10 min are excluded\]. \[Clarification: We are reporting the mean "events per patient-day" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Advance Warning Times (AWTs) for SHEs Predicted by {Index > 35%} Prior to Earliest Hypotension (Outcome 3.2.2)	Up to 8 hours	AWTs (median) for SHEs predicted by an SHE-contiguous notification event (i.e., Index \> 35%) prior to the SHE's earliest hypotension \[i.e., MAP \< goal\]. NOTE: A positive AWT denotes a notification event that occurs chronologically in advance of the onset of the SHE event. For example, an AWT of +3 would mean the first notification event occurred 3 minutes before the onset of the SHE event.
AWTs for SHEs Predicted by {Index > User's Index Threshold Setting} Prior to Earliest Hypotension (Outcome 3.2.4)	Up to 8 hours	AWTs for SHEs predicted by an SHE-contiguous notification event (i.e., Index \> user's Index threshold setting) prior to the SHE's earliest hypotension \[i.e., MAP \< goal\]. NOTE: A positive AWT denotes a notification event that occurs chronologically in advance of the onset of the SHE event. For example, an AWT of +3 would mean the first notification event occurred 3 minutes before the onset of the SHE event.
Percentage of Total SHEs Predicted by {Index > 35%} Prior to Continuous Hypotension (Outcome 3.3.1)	Up to 8 hours	Percentage (%) of total SHEs predicted by an SHE-contiguous notification event (i.e., Index \> 35%) prior to continuous hypotension \[intervals of ≥ 10 minutes of physiological MAP continuously below the hypotension threshold (physiological MAP are samples that do not meet the non-physiological criteria)\]. NOTE: excluding SHEs predicted prior to earliest hypotension
AWTs for SHEs Predicted by {Index > 35%} Prior to Continuous Hypotension (Outcome 3.3.2)	Up to 8 hours	AWTs for SHEs predicted by an SHE-contiguous notification event (i.e., Index \> 35%) prior to continuous hypotension and excluding SHEs predicted prior to earliest hypotension. NOTE: A negative AWT denotes a notification event that occurs chronologically after the onset of the SHE event. For example, an AWT of -3 would mean the first notification event occurred 3 minutes after the onset of the SHE event, although still in advance of continuous hypotension.
Percentage of Total SHEs Predicted by {Index > User's Index Threshold Setting} Prior to Continuous Hypotension (Outcome 3.3.3)	Up to 8 hours	Percentage (%) of total SHEs predicted by an SHE-contiguous notification event (i.e., Index \> user's Index threshold setting) prior to continuous hypotension \[intervals of ≥ 10 minutes of physiological MAP continuously below the hypotension threshold (physiological MAP are samples that do not meet the non-physiological criteria)\]. NOTE: excluding SHEs predicted prior to earliest hypotension
AWTs for SHEs Predicted by {Index > User's Index Threshold Setting} Prior to Continuous Hypotension (Outcome 3.3.4)	Up to 8 hours	AWTs for SHEs predicted by an SHE-contiguous notification event (i.e., Index \> user's Index threshold setting) prior to continuous hypotension and excluding SHEs predicted prior to earliest hypotension. NOTE: A negative AWT denotes a notification event that occurs chronologically after the onset of the SHE event. For example, an AWT of -3 would mean the first notification event occurred 3 minutes after the onset of the SHE event, although still in advance of continuous hypotension.
Percentage of Total SHEs Detected by {Index > 35%} After Continuous Hypotension Onset (Outcome 3.4.1)	Up to 8 hours	Percentage (%) of total SHEs predicted by an SHE-contiguous notification event (i.e., Index \> 35%) after onset of continuous hypotension
AWTs for SHEs Predicted by {Index > 35%} After Continuous Hypotension Onset (Outcome 3.4.2)	Up to 8 hours	AWTs for SHEs predicted by an SHE-contiguous notification event (i.e., Index \> 35%) after onset of continuous hypotension. NOTE: A positive AWT denotes a notification event that occurs chronologically in advance of the onset of the SHE event. For example, an AWT of +3 would mean the first notification event occurred 3 minutes before the onset of the SHE event.
Percentage of Total SHEs Detected by {Index > User's Index Threshold Setting} After Continuous Hypotension Onset (Outcome 3.4.3)	Up to 8 hours	Percentage (%) of total SHEs predicted by an SHE-contiguous notification event (i.e., Index \> user's Index threshold setting) after onset of continuous hypotension
Percentage of Total SHE False Resolutions Detected by {Index > 35%} (Outcome 3.5.2)	Up to 8 hours	Percentage (%) of total SHE false resolutions with a contiguous notification event where {Index \> 35%}
Percentage of Total SHE False Resolutions Not Detected by {Index > 35%} With InOp State During False Resolution (Outcome 3.5.3)	Up to 8 hours	Percentage of total SHE false resolutions that were not detected by {Index \> 35%} and had InOp state occurring during the index false resolution episode
Percentage of Total SHE False Resolutions Not Detected by {Index > 35%} Without InOp State During False Resolution (Outcome 3.5.4)	Up to 8 hours	Percentage (%) of total SHE false resolutions that were not detected by {Index \> 35%} and did not have InOp state occurring during the index false resolution episode
Percentage of Total SHE False Resolutions Not Detected by {Index > User's Index Threshold Setting} Without InOp State During False Resolution (Outcome 3.5.7)	Up to 8 hours	Percentage (%) of total SHE false resolutions that were not detected by {Index \> user's Index threshold setting} and did not have InOp state occurring during the index false resolution episode
Incidence of Notification Events {Index > 35%} That Are Contiguous With SHEs (Outcome 3.6.1)	Up to 8 hours	Incidence of notification events {Index \> 35%} that are contiguous with SHEs, excluding notification events with onset during an SHE. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > User's Index Threshold Setting} That Are Contiguous With SHEs (Outcome 3.6.2)	Up to 8 hours	Incidence of notification events {Index \> user's Index threshold setting} that are contiguous with SHEs, excluding notification events with onset during an SHE. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > 35%} That Are Sentinel Notifications (Outcome 3.6.3)	Up to 8 hours	Incidence of notification events {Index \> 35%} that are sentinel notifications \[sentinel notification is a notification event that occurs within 60 min prior to an SHE; recorded dose increase; or during stuttering hypotension (defined in 3.7.1)\], excluding notification events with onset during an SHE. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > 35%} That Are False Notifications (Outcome 3.6.5)	Up to 8 hours	Incidence of notification events {Index \> 35%} that are false notifications (defined as notification events not contiguous with an SHE and not a sentinel notification, excluding notification events with onset during an SHE. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > 35%} Contiguous With an SHE False Resolution (Outcome 3.6.7)	Up to 8 hours	Incidence of notification events {Index \> 35%} contiguous with an SHE false resolution. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > User's Index Threshold Setting} Contiguous With an SHE False Resolution (Outcome 3.6.8)	Up to 8 hours	Incidence of notification events {Index \> user's Index threshold setting} contiguous with an SHE false resolution. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > 35%} Contiguous With an SHE True Resolution, Overall (Outcome 3.6.9)	Up to 8 hours	Incidence of notification events {Index \> 35%} contiguous with an SHE true resolution. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > User's Index Threshold Setting} Contiguous With an SHE True Resolution, Overall (Outcome 3.6.10)	Up to 8 hours	Incidence of notification events {Index \> user's Index threshold setting} contiguous with an SHE true resolution. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > 35%} Contiguous With an SHE True Resolution, Suppressible (Outcome 3.6.11)	Up to 8 hours	Incidence of notification events {Index \> 35%} contiguous with an SHE true resolution after excluding all notification event interval that were within 8 min of a documented clinical intervention. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > User's Index Threshold Setting} Contiguous With an SHE True Resolution, Suppressible (Outcome 3.6.12)	Up to 8 hours	Incidence of notification events {Index \> user's Index threshold setting} contiguous with an SHE true resolution after excluding all notification event interval that were within 8 min of a documented clinical intervention. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > 35%} With Onset During an SHE (Outcome 3.6.13)	Up to 8 hours	Incidence of notification events {Index \> 35%} with onset during an SHE. \[Clarification: We are reporting the mean "notification events / patient-day (24h)" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Incidence of Notification Events {Index > User's Index Threshold Setting} With Onset During an SHE (Outcome 3.6.14)	Up to 8 hours	Incidence of notification events {Index \> user's Index threshold setting} with onset during an SHE. \[Clarification: We are using "notification events / patient-day (24h)" as the Unit of Measure for several reasons. First, different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Duration of False Notification Events {Index > 35%} (Outcome 3.6.15)	Up to 8 hours	Median duration of false notification events {Index \> 35%}
Duration of False Notification Events {Index > User's Index Threshold Setting} (Outcome 3.6.16)	Up to 8 hours	Median duration of false notification events {Index \> user's Index threshold setting}
Stuttering Hypotension Incidence (Outcome 3.7.1)	Up to 8 hours	Stuttering hypotension incidence \[Stuttering hypotension event commences upon hypotension and with \>= 10 min of cumulative hypotension within subsequent 60 min; terminates upon next time point when onset condition is no longer met AND when MAP \>= goal; intervals that qualify as an SHE are excluded from stuttering hypotension\]. \[Clarification: We are reporting the mean "events per patient-day" as the Unit of Measure. Different subjects were observed for different intervals of time, with a maximum 8 hours specified in the protocol. Because subjects were observed for different time intervals, it is helpful to standardize findings as events per unit of time. Standardizing the events to units of time allows for valid inter-subject comparison when subjects have differing observation intervals. Next, events per DAY is a conventional Unit of Measurement that is both valid and easy to interpret, even though subjects were not observed for an entire day.\]
Percentage of Total Stuttering Hypotension Episodes Detected by {Index > 35%} Prior to the Stuttering Hypotension's First Hypotension (Outcome 3.7.2)	Up to 8 hours	Percentage (%) of total stuttering hypotension episodes detected by {Index \> 35%} prior to the stuttering hypotension's first hypotension
Percentage of Total Stuttering Hypotension Episodes Detected by {Index > User's Index Threshold Setting} Prior to 10 Cumulative Min of Hypotension (Outcome 3.7.8)	Up to 8 hours	Percentage (%) of total stuttering hypotension episodes detected by {Index \> user's Index threshold setting} prior to the occurrence of 10 cumulative minutes of hypotension within that stuttering hypotension episode (excluding episodes detected prior to first hypotension)
AWTs for Stuttering Hypotension Episodes Detected by {Index > User's Index Threshold Setting} Prior to 10 Cumulative Min of Hypotension (Outcome 3.7.9)	Up to 8 hours	AWTs for stuttering hypotension episodes detected by {Index \> user's Index threshold setting} prior to 10 cumulative min of hypotension. NOTE: A positive AWT denotes a notification event that occurs chronologically in advance of the onset of the SHE event. For example, an AWT of +3 would mean the first notification event occurred 3 minutes before the onset of the SHE event.
Percentage of Total Stuttering Hypotension Episodes Not Detected by {Index > 35%} Prior to 10 Cumulative Min of Hypotension (Outcome 3.7.10)	Up to 8 hours	Percentage (%) of total stuttering hypotension episodes not detected by {Index \> 35%} prior to the occurrence of 10 cumulative minutes of hypotension within that stuttering hypotension episode
Percentage of Total Stuttering Hypotension Episodes Not Detected by {Index > User's Index Threshold Setting} Prior to 10 Cumulative Min of Hypotension (Outcome 3.7.11)	Up to 8 hours	Percentage (%) of total stuttering hypotension episodes not detected by {Index \> user's Index threshold setting} prior to the occurrence of 10 cumulative minutes of hypotension within that stuttering hypotension episode

Trial Locations

Locations (1): Massachusetts General Hospital
🇺🇸
Boston, Massachusetts, United States
Massachusetts General Hospital
🇺🇸Boston, Massachusetts, United States