The Tandem t:slim X2
Safety Reminder: When preventing DKA while using a hybrid closed loop pump
- Place the pump in manual mode before giving insulin by pen or syringe.
- Keep the pump in manual mode for at least 4 hours after the last injection of insulin by pen or syringe.
- After resuming automated insulin delivery, check that the desired glucose target is set.
- Colour touch screen
- Dexcom G6 CGM enabled
- Rechargable battery
- Tubed proprietary infusion sets
- Upgrades are done via software downloads after learning module completions.
- Basal IQ, the feature in older models, only reduces basal insulin but also allows for individualization of glucose targets e.g. in pregnancy. Tandem provides loaners for clients on Control IQ currently wishing to transfer to Basal IQ during their pregnancy.
- Control-IQ is in the newest upgrade. It adjusts insulin delivery to help prevent highs (automated partial corrections and increased basal insulin) and lows (temp basal suspensions), while requiring the user to manually bolus for meals. Individualization of glucose targets is not an option. The algorithm uses a patient's programmed basal rates, and correction factors (ISF) and potentially other factors to make automated dose adjustments. Carbohydrate counting and food boluses are still required. When Control IQ is active, a patient can adjust basal rates, ISF, carb ratios but not insulin duration, and not glucose targets.
How Control IQ Works
- SIMULATOR or VIRTUAL PUMP: Tandem t:simulator app for iPhone & Android
- t:slim X2 User Manuals (choose the model) & link for other resources
- Analyzing Basal IQ data in Diasend
- Analyzing Control IQ data in t:Connect PDF
- Tandem Transfer Pump Settings Worksheet
- Patient education: Tandem FAQs and Tandem Guide for Successful Pumping
- Personal PIN over-ride is 314159
- CARES- Calculate, Adjust, Revert, Educate, Sensor
- Training Videos
- Specific Programming Videos (also see Tandem YouTube Channel)
- Navigating the Touch Screen
- Setting up Personal Profile - Options > My Pump > (choose profile)
- For each time segment, the following are required: basal rate, ISF, ICR.
- Loading and filling a cartridge
- Cartridge Fill Expectations
- Control IQ - Turning on
- Control IQ: Exercise Mode
- Control IQ: Sleep Mode
- Extend a Bolus
- Bolus Calculator
- Quick Bolus Button
- Set Temporary Basal Rate
- Stop and Resume Insulin
- Enter CGM Transmitter ID
- Home Screen Shortcut
- Turn Off Your Pump
- Unintended Touch Protection
- Understand the Wake Button Colored LEDs
- Cannula Fills
- t:90 set 6 mm cannula requires 0.3 units of insulin
- t:90 set 8 mm cannula requires 0.5 units of insulin
- Time Limited Training: Getting the Most Out of Control-IQ™Technology:
- Case Reviews: A“mini-series” of weekly, quick-learning, advanced case reviews (sleep, exercise, complex meals, gastroparesis, challenging situations, etc.) for health care professionals. There is a new case each week.Register in advance for these meetings:
- 12:00 – 12:30 PM ET Wednesdays September 8th to October 27th, 2021
- 3:00 - 3:30 PM ET Thursdays September 9th to October 28th, 2021
Indications, TDD, Weight & other FYI
- TDD and weight Indications for Control IQ are TDD 10-100 units per day and weight 25-140 kg. Patients beyond these indication levels have still used Control IQ; it is then an off-label usage. These are the maximum allowable entries into the system at initiation.Control-IQ uses these initial entries to enable the algorithm to start working right immediately without awaiting past data for the algorithm. However, as time passes, the algorithm uses actual delivered TDD based on a rolling 6 day average.
- Max Basal Rate:
If programmed basal rate is > 3u/hr, the system will deliver it if the CGM signal is active. However, for safety, if a CGM signal is lost for > 20 minutes the system reverts to 3u/hr as max even if their programmed rate is >3u/hr. To avoid this being an issue, suggest having the patient turn Control-IQ OFF during the two hour warm up on a new sensor every 10 days.
- For basal modulations and automated corrections in Control IQ, the algorithm requires the following.
- Programmed basal rates
- Programmed correction factor (ISF)
- The last 6 days of total daily insulin dose or the inputted total daily dose and weight at the start of using Control IQ. It’s recommended, but not required, to update these values on occasion. These should be updated to current values if resuming pump after having been off it.
- Current and predicted glucose reading 30 minutes out
- Glucose target (default, sleep or exercise mode)
- Insulin on board
- Bolus information
- Maximum bolus size is 25u. Over that, patients would need two boluses for a meal.
- Max extended bolus duration is 2 hours.
- Control IQ suggests manual meal boluse and manual corrections doses using the same calculations of the pump in manual mode.
- This cannot be changed in Control IQ
- Duration of insulin action (set at 5 hours)
- This can be changed in Control IQ
- Basal rate and alternate basal profile
- Carb Ratio
- Insulin Sensitivity Factor e.g. Correction (may wish to make stronger if people are used to a shorter duration of insulin action e.g. from ISF of 3 to 2.5)
- The preset target from default (6.1 mmol/L) to sleep to activity
Control IQ Start Tips, Suggestions, Experiences
Starting Control IQ (CIQ) at the time of pump start requires a conversation with the patient and healthcare team. As a reminder, patients can self-train and start on their own; that needs to be kept in mind with the conversations. Safety is the priority, especially with switches from considerably longer acting injected basals (Tresiba) to CIQ. Some suggestions for discussion are below.
- When setting up CIQ, consider inputting only 75% of total daily insulin into the field requesting this data.
- Consider using Exercise Activity (higher target) if using CIQ at time of pump start.
- Depending on when Tresiba (degludec) or potentially other injected basal insulin was reduced or stopped, it may be safer to use one day (or more) of manual pump with a signifcant temp basal reduction before proceeding to CIQ using the Exercise Activity for the second day on pump.
- Prioritize your problem solving and change doses for actual hypoglycemia events that occur despite Control IQ suspending low.
- Frequent basal suspensions in the reports (red bars) do not necessarily indicate hypoglycemia or indicate a need for a change in therapy. Problem solve or change doses if the suspensions are for longer periods of time and/or with a regular pattern. Tandem indicates short suspensions are 5-30 minutes. Long suspensions are more than 30-45 minutes.
- Tandem suggests using 5-10 g or rapid acting carbohydrate to treat hypoglycemia and evaluate. Since basal insulin delivery had already been suspended for some period of time, the full carbohydrate treatment may not be needed.
- Frequent auto basal increases or hourly auto corrections in the Diasend reports do not necessarily indicate a need for change in therapy.
- Assess problem areas of high readings where the automated insulin delivery cannot address the hyperglycemia.
- The Tandem user guide reports the maximum insulin delivery rate is calculated using ISF (Insulin Sensitivity Factor or Correction Factor), estimated and recorded total daily insulin, and IOB (current insulin on board).
- Hyperglycemia occuring in repeated patterns may be addressed with basal rate changes or depending on the timing, ICR.
- Hyperglycemia that is frequent but sporadic in timing and non responsive may, after troubleshooting, be addressed with changes to ISF. Tandem uses an insulin action time of 5 hours. Some patients have found they need a more agressive ISF when in Control IQ.
- Patients may wish to set different basal profiles: A manual profile with usual (less aggressive) ISF when not using Control IQ; A profile for when control IQ is used on a usual day (may have a more aggressive ISF); A profile for when sick or menstruating which may have increased basal rates beyond the settings used for their usual Control IQ profile.
- Tandem Diabetes Care Canada Website
"Office Hours" for Healthcare Professionals ONLY to connect with Tandem Trainers are below:
Monday’s 3pm – 7pm ET hosted by Teri Currie RN, CDE
Wednesday’s 12pm – 4pm ET hosted by Jessica Eichler RD, CDE
Thursday’s 12pm – 4pm ET hosted by Donna McGlennon RN, CDE
Thursday’s 10am – 2pm ET hosted by Jennifer Rene RN, CDE (FRENCH)
Friday’s 11am – 3pm ET hosted by Amanda Coschi RN, CDE