A Practical Note on Transferring Ideas and Methods from Consultancy Practice to the MPA Classroom: A Personal Account from a Danish Case Study.
Summary (2 min read)
1. Introduction
- Over 500000 people all over the world suffer from cardiac arrest every year.
- The probability of survival is highly dependent on correct treatment of the patient, which relies on knowledge of the current state of the patient, such as type of rhythm and circulatory information.
- This knowledge is difficult to obtain manually.
- The task of performing the carotid pulse check has for example been shown to be very inaccurate and time consuming [1].
- A simple, objective and noninvasive way of monitoring circulatory parameters is therefore of great interest and may potentially increase survivability of cardiac arrest patients.
2. Methods
- Medicine, Medical University of Vienna from March 2003 to January 2005.
- The impedance measurements were recorded using commercially available self-adhesive electrode defibrillator pads (Heartstart Pads, Philips Medical Systems, Seattle, WA, USA), by passing a 32 kHz, 3 mA peak-to-peak sinusoidal current between them and measuring the resulting voltage difference between the electrodes.
- The blood pressure was measured via an arterial line in the arteria radialis.
- Measurements periods where the patient did not have a pulse were excluded from the study, and 49 episodes therefore had to be discarded.
2.1. Extracting information from the measurements
- Figure 1 shows the electrocardiogram (ECG), the impedance, its first derivative and the blood pressure trace of a measurement from the UN data.
- The mean of the impedance signal was first removed, since the authors are only interested in the temporal changes of the measurement.
- The impedance measurement and its derivative is flipped since the negative peaks of the fluctuations historically have been the parameters used for estimation of SV [2].
- For each heartbeat the authors calculate the magnitude of the negative peak of the impedance fluctuation and its first time derivative (d).
- From the blood pressure measurement the authors extract the systolic (Ps), diastolic (Pd), the pulse pressure (PP) and the mean arterial pressure (MAP).
2.2. Correlation study
- For each patient the authors now have averages of Zpeak and dZpeak per heart beat for which they also have parameters describing the blood pressure.
- The authors now want to see if any of the parameters are correlated over the patient group.
- The sample set of the different parameters are compared by computing their correlation coefficient ρ defined as [7].
- Ρxy = Cxy√ σxσy (2) where x and y are the two random processes with variance σx and σy the authors want to compare.
3. Results
- Table 1 summarizes the results of the correlation study.
- The correlation is generally higher for the CA data than for the UN data.
- There are none of the correlations that are statistically significant for the UN data.
- The distributions of the parameters are plotted in Figure 2, where each point represents one patient.
4. Discussion and conclusions
- It would be valuable for a rescuer to have circulatory information about a patient undergoing resuscitation due to cardiac arrest.
- It has been suggested [3] to measure the thoracic impedance through the defibrillator pads, and thereby acquire information related to blood circulation [2].
- The authors wanted to explore the information that could be drawn from such measurements, and therefore simultaneously recorded the thoracic impedance by using standard defibrillator pads and the blood pressure arterially from 79 patients undergoing resuscitation and 37 hemodynamically stable patients.
- Figure 2(a) shows the parameters with the highest correlation, ρ = 0.4338, and illustrates that even the best relation in terms of correlation appears for the human eye to be close to random.
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Frequently Asked Questions (9)
Q2. What are the dimensions of the helicopter perspective?
The teachers and fellow participants provide the helicopter perspective with theories, cases, discussions, and assignments – the distance and objectivity dimensions.
Q3. What were the activities used to increase involvement?
The involvement strategies used included : 10 cross sectional project groups which yielded a 10% improvement in patient care (Nicolaisen:2015); meetings for all staff, in the sections, in the joint committee and with top management ; interactive project days for all staff; a newsletter and an annual report.
Q4. What did the participants learn from the reflective journalling process?
From the reflective journalling process, managers could see themselves as role models for collaboration across sections in the department.
Q5. What was the purpose of the seminars?
The seminars provided a forum to discuss the future of the organisation since the Capital Region had just announced a merger of the G-hospital with the much larger and very much prestigious National Hospital.
Q6. What was the result of the group dialogue?
In the group dialogue afterwards it was obvious that the members had become more conscious about their managerial and leadership roles.
Q7. What was the key to the development and learning model?
From the start of the consultancy, creating psychological safety for those involved was key, although the development and learning model was not introduced immediately.
Q8. What was the author's attitude towards the merger process?
The author came to the process with an open mind in the Engelundian mode, ready to work with organization as it evolved and to work with the ideas that emerged from the merger process.
Q9. What was the main benefit of the merger?
The openness in the organization not only enabled the merger process and Nicolaisen’s constructive evaluation but also facilitated development of this pedagogical perspective, generating new tools and methods and expanding the teaching repertoire for mid-career classrooms.