单腔鉴别诊断.ppt

Parameters Stability – Interval threshold used to identify unstable ventricular intervals. Off(N); 30; 40 … 100 ms Considerations Review the following information before programming Stability parameters. Stability interval – A small Stability value may not allow for normal VT interval variation and may decrease the sensitivity of the device to detect VT. So, it should be programmed large? 4.3.1.0 450-40030,未到3 VT Monitor events and Stability – Stability can also reset the VTM event count but does so independently from its operation on the VT event count. The VTM event count must be at least three before Stability is applied to events in the VT Monitor zone. See Section 6.7, “Monitoring VT episodes” NID,RNID QRS complexes Cautions: The EGM Width criterion should not be used for patients with fast or poorly tolerated VTs. The EGM Width criterion is less likely to be effective in patients with narrow complex VTs, with bundle branch block, or whose QRS complexes are affected by antiarrhythmic medications. EGM Width On, Off, or Passive Width Threshold (ms) A sensed event is designated wide if its QRS complex equals or exceeds this width. Slew Threshold (mV/s) Defines the beginning and end of each sensed QRS complex, using the rate of amplitude change in the EGM 2 waveform. The EGM Width test (9) helps you find the most effective parameter settings by measuring the patient’s QRS complexes during sinus rhythm. – QRS Snapshots (25) show how the parameters settings are being applied during automatic detection. – The Passive criterion setting (16) provides ambulatory monitoring of the ICD’s ability to discriminate between VT and SVTs. . Slew Threshold (mV/s) Defines the beginning and end of each sensed QRS complex, using the rate of amplitude change in the EGM 2 waveform. The Wavelet Dynamic Discrimination criterion is designed to withhold detection of rapidly conducted SVT episodes. only in VR devices. 7274－7230 When it is available:NID The Wavelet Dynamic Discriminatio