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<blockquote data-quote="tim2000s" data-source="post: 1281550" data-attributes="member: 30007"><p>The way the 640 suspends is based on a predictive model. </p><p></p><p>It will suspend when:</p><ul> <li data-xf-list-type="ul">Your Sensor Glucose (SG) value is at or within 3.9 mmol/L above your low limit & </li> <li data-xf-list-type="ul">Your SG is predicted to reach or fall below a level that is 1.1 mmol/L above your low limit within approximately 30 minutes.</li> </ul><p>This combination proves to be very effective at heading off lows (I wrote something about it <a href="http://www.diabettech.com/artificial-pancreas/medtronicuk-640g-smartguard-suspend-some-analysis-of-my-own-activity-and-a-few-useful-lessons-gbdoc/" target="_blank">here</a>). My experience of this was that with a carb counted meal, you could overbolus by around 20% and it would still stop you hitting low glucose levels with the suspend model it employs. In fact, you can set your low level at something like 4.8 and it becomes really quite difficult to go low due to the way this algorithm works. </p><p></p><p>Obviously it goes without saying that you should always have emergency carbs - that's always the risk with exogenous insulin.</p></blockquote><p></p>
[QUOTE="tim2000s, post: 1281550, member: 30007"] The way the 640 suspends is based on a predictive model. It will suspend when: [LIST] [*]Your Sensor Glucose (SG) value is at or within 3.9 mmol/L above your low limit & [*]Your SG is predicted to reach or fall below a level that is 1.1 mmol/L above your low limit within approximately 30 minutes. [/LIST] This combination proves to be very effective at heading off lows (I wrote something about it [URL='http://www.diabettech.com/artificial-pancreas/medtronicuk-640g-smartguard-suspend-some-analysis-of-my-own-activity-and-a-few-useful-lessons-gbdoc/']here[/URL]). My experience of this was that with a carb counted meal, you could overbolus by around 20% and it would still stop you hitting low glucose levels with the suspend model it employs. In fact, you can set your low level at something like 4.8 and it becomes really quite difficult to go low due to the way this algorithm works. Obviously it goes without saying that you should always have emergency carbs - that's always the risk with exogenous insulin. [/QUOTE]
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