Performance Measurement Network

Question: Comprehensive Stroke (CSTK Sub-Populations)

Karen, would you please confirm the measures that apply to each sub-population? From my review it appears that the measures that correspond to the 3 sub-populations are as follows:

CSTK-1: The count of all patients in sub-population 1 – Ischemic Stroke

CSTK-2, CSTK-5 (5a/5b, CSTK-7, CSTK-8: The count of all patients in sub-population 2 - Ischemic Stroke with IV t-PA, IA t-PA or MER

CSTK-3,(3a/3b CSTK-4, CSTK-6: The count of all patients in sub-population 3 – Hemorrhagic Stroke

Appreciate your response.)


The measures that the subpopulation applies to is under the quarterly and monthly descriptions on pages 9-11 of the implementation guide and is as follows:

Sub-population 1 - CSTK-01 Measure

Sub-Population 2 - Measures CSTK-01, CSTK-02, CSTK-05, CSTK-07, CSTK-08

Sub-population 3 - Measures CSTK-03, CSTK-04, and CSTK-06

CSTK-01 NIHSS Score Performed for Ischemic Stroke Patients requires a sample from BOTH CSTK-01 sub-population1 and CSTK sub-population 2 (i.e., two individual sample selections to meet the minimum sample requirement for this measure because ischemic stroke w/o procedures is the 60-70% of all cases. The other approx. 25%-30% have a reperfusion procedure. We want to make sure that both sub-groups are adequately represented in the sample selection.

If you had 50 principal diagnoses of ischemic stroke for the month of June and 10 had a reperfusion therapy/procedure, your required sample for CSTK-01 is 10 for sub-population 2 PLUS 14 cases randomly selected from the remaining 40 cases that did not have a procedure (sub-population 1)for a total minimum sample requirement of 34 cases for CSTK-01. Using the same example of 50 principal diagnoses of ischemic stroke for the month of June and 10 ischemic cases with reperfusion procedures, your minimum required sample for CSTK-02, CSTK-05, CSTK-07, CSTK-08 is the 10 cases that had a procedure.

Sampling for CSTK will only benefit those HCOs with a large volume of hemorrhagic cases or large number of ischemic strokes who receive reperfusion therapies. Many HCOs may not meet the minimum required sample size for CSTK sub-population 2 and CSTK sub-population 3 and will need 100% review of cases in these two sub-groups. )

Question Details
Focus area(s): Chart Abstracted Measure Specifications – Clinical
Related documents: CSTK,

Copyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding Performance Measurement Network? Send feedback
This website is using cookies. More info. That's Fine