How To Determine Pad
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- Nathaniel Moore
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1 Process Representation #1 : The PAD algorithm as a sequential flow thru all sections An exploded version of the above scoped section flow is shown below. Notes: The flow presupposes existing services ( Partner Links ) for extracting EHR data such as codes and medications The boxes that end in Rules could contain hard coded rules (e.g., Java, XPath, SQL) OR more flexibly represent invocation of an external rule engine in which such rules are stored and then able to be dynamically reconfigured during process execution As we proceed from Section 2 5, the # of matches are accumulated. A final tally and PAD assessment is made prior to return of definite, probable or negative assessment for PAD NHGRI U01 HG EMR Phenotypes and Community Engaged Genomic Associations Last Updated: July 8,
2 NHGRI U01 HG EMR Phenotypes and Community Engaged Genomic Associations Last Updated: July 8,
3 Process Representation #2: The PAD algorithm with early exit on a definite assessment This is an alternate flow in which we decide to exit the process on immediate determination of a definite PAD assessment. All other internal processing within the grey scoped sections is reused from representation #1 above. This just demonstrates the agility a process based approach to design can bring. Algorithms can be adjusted as new evidence based criteria is discovered via easy changes to rules or process flow representation without affecting other components (i.e., services, data access layers, etc.). NHGRI U01 HG EMR Phenotypes and Community Engaged Genomic Associations Last Updated: July 8,
4 Peripheral Arterial Disease (PAD) Peripheral Arterial Disease (PAD) is prevalent with approximately million adults in US affected. For those with PAD, morbidity and mortality are high and quality of life is markedly impaired. The genetic basis of PAD is poorly understood and is the focus of the Mayo Clinic Electronic Medical Records and Genomics (emerge) Network study. In this document, we provide pseudocode modeling a standardized diagnostic algorithm for PAD. A set of gold standard rules were developed for the Mayo Clinic population as well as billing rules for transportability to sites without vascular laboratory data. Depending on the values of relevant variables, the rules classify a patient into one of the 2 classes: presence of PAD, and absence of PAD. Ankle brachial index (ABI) for ascertaining PAD The ankle brachial index (ABI) was measured in Mayo Clinic s non invasive vascular laboratory in Rochester MN using a standardized protocol. Following a 5 min rest, subjects were evaluated in the supine position. Appropriately sized BP cuffs were placed on each arm and ankle, and a Doppler ultrasonic instrument (Medisonics, Minneapolis MN) was used to detect arterial signals. The cuff was inflated to 10 mm Hg above SBP and deflated at 2 mm Hg/s. The first reappearance of the arterial signal was taken as the SBP. To calculate the ABI, the SBP at each ankle site (posterior tibial and dorsalis pedis arteries) was divided by the higher of the two brachial pressures. The lower of the average ABIs from the two legs was used to define PAD. An ABI cut point of less than or equal to 0.90 was used to diagnose PAD. Subjects with poorly compressible arteries due to medial arterial calcification were also classified as having PAD. The criteria for poorly compressible arteries in the Mayo vascular lab are as follows: an ABI >1.4, an ankle BP >255 mmhg, or having non reproducible ankle BP measurements. EMR Extraction of ABI Phenotype To define a definite PAD case population, patients will: meet the algorithmic vascular lab criteria in Section 1 or have any of the two related codes or presence of indicative phrases in Sections 2 5. To define a probable PAD case population for further investigation, patients will beet any one of the related codes or presence of indicative phrases in Sections 2 5. Section 1: Vascular Lab Criteria NHGRI U01 HG EMR Phenotypes and Community Engaged Genomic Associations Last Updated: July 8,
5 Ankle brachial index <0.9 at rest or post exercise; ankle systolic blood pressure >255 mmhg, or any ABI >1.4 Exclude non atherosclerotic causes of PAD: 2 occurrences of the following codes , 237.7, 443.1, 446.0, 446.4, 446.5, 446.6, 446.7, 447.6, 710.1, 747.1, Section 2: ICD 9 CM Diagnosis Codes For PAD 440.2, 440.3, or Section 3: Procedure Codes Related To PAD One of the ICD 9 CM/CPT 4 procedure codes for lower extremity artery angiography: 88.48, 75710, 75711, 75712, 75716, 75717, 75718, 75630, PLUS one (concurrent) of the codes below for non coronary vessel stents: 39.50, 39.90, 37205, 37206, 37207, 37208, 37184, 37185, OR One of the ICD 9 CM/CPT 4 procedure codes for lower extremity artery surgical and percutaneous vascular interventions: 38.18, 39.50, 39.25, 39.29, 38.08, 38.38, 38.48, 39.49; 39.56, 39.57, 39.58, 39.90, 35302, 35303, 35304, 35305, 35306, 35331, 35351, 35355, 35361, 35363, 35371, 35372, 35381, 35452, 35454, 35456, 35459, 35470, 35472, 35473, 35474, 35481, 35482, 35483, 35485, 35491, 35492, 35493, 35495, 35521, 35533, 35537, 35538, 35539, 35540, 35541, 35546, 35548, 35549, 35551, 35556, 35558, 35563, 35565, 35566, 35571, 35582, 35583, 35585, 35587, 35621, 35623, 35637, 35638, 35641, 35646, 35647, 35651, 35654, 35656, 35661, 35663, 35665, 35666, 35671, 35226, 35256, 35286, 35700, 35721, 35741, 35876, 35879, 35881, 35883, 35884, 37184, 37185, 37186, 37205, 37206, 37207, Exclude if one of the following ICD 9 CM codes for alternate reasons for surgery is also present: 736.3, 736.4, 736.5, 736.6, 736.7, 736.8, 736.9, 735., 754.3, 754.4, 754.5, 754.6, 754.7, , , , 755.3, 755.4, 755.6, 755.8, 759.7, , 895., 896., 897., 820., 821., 822., 823., 824., 825., 826., 827., 828., 829., 835., 836., 837., 838., 904., 928., 929., 959.6, 959.7, 996.4, , , , OR One of the ICD 9 CM/CPT 4 procedure codes for lower extremity amputation: 84.1, 84.91, 27295, 27590, 27591, 27592, 27598, 27880, 27781, 27782, 27888, 27889, 28800, Exclude if one of the following ICD 9 CM codes for non vascular amputation is also present: 170.6, 170.7, 170.8, 170.9, 171.3, 172.7, 173.7, 198.5, 344.1, 711.0, , 733.2, 736.3, 736.4, 736.5, 736.6, 736.7, 736.8, 736.9, 735., 754.3,754.4,754.5,754.6,754.7,755.02, , , 755.3, 755.4, 755.6, 755.8, 759.7, , 820., 821., 822., 823., 824., 825., 826., 827., 828., 829., 835., 836., 837., 838., 890., 891, 895., 896., 897., 904., 905.4, 928., 929.,959.6, 959.7,996.4, , , , NHGRI U01 HG EMR Phenotypes and Community Engaged Genomic Associations Last Updated: July 8,
6 Mutivariable logistic regression model to ascertain PAD. This model was based on billing codes and analysis of the vascular test (ABI) results in the vascular lab database at Mayo Rochester. In this database of individuals studied over the last decade, had PAD and 7748 did not. This model uses the following billing code variables to predict presence of PAD in these patients. Variable DF Estimate StdErr WaldChiSq ProbChiSq Score Intercept CPT4Px CPT4Px CPT4Px CPT4Px CPT4Px ICD9Px ICD9Dx ICD9Dx ICD9Dx ICD9Dx ICD9Dx ICD9Dx ICD9Dx ICD9Dx An integer score based on the betacoefficients was created and used to predict presence of PAD. The results of our study are shown in the ROC curve below. The AUROC was A score of 8 had ~80% sensitivity and specificity for the prediction of PAD. A description of the billing codes is provided in the table below. Code Estimate Score Code Description CPT4Px MRA Lower extremity w/ or w/o contrast CPT4Px CT angiogram - abdominal aorta and bilateral iliofemoral lower extremity runoff CPT4Px Angiography, extremity, unilateral, radiological supervision and interpretation CPT4Px bilateral angiograph extremity CPT4Px Non-invasive physiologic studies of lower extremity arteries, single level, bilateral ICD9Px Arteriography of femoral and other lower extremity arteries ICD9Dx Atherosclerosis of native arteries of the extremities, unspecified ICD9Dx Atherosclerosis of native arteries of the extremities with intermittent claudication ICD9Dx Atherosclerosis of native arteries of the extremities with rest pain ICD9Dx Atherosclerosis of native arteries of the extremities with ulceration ICD9Dx Atherosclerosis of native arteries of the extremities with gangrene ICD9Dx Atherosclerosis of other specified arteries ICD9Dx generalized and unspecified atherosclerosis ICD9Dx Peripheral vascular disease, unspecified NHGRI U01 HG EMR Phenotypes and Community Engaged Genomic Associations Last Updated: July 8,
7 Section 4: NLP Of Radiology Reports Assess presence of phrases indicative of lower limb artery stenosis/occlusion in one or more sentences through Natural Language Processing (NLP) annotation techniques. Key words for lower extremity arteries: left leg; right leg; left lower extremity; right lower extremity; bilaterally; Iliac artery (arteries); femoral artery (arteries); SFA; Superficial (arteries); Profunda (arteries); Deep femoral (arteries); Popliteal (arteries); tibioperoneal trunk (trunks); peroneal (arteries); Anterior tibial (arteries); AT; Posterior tibial (arteries); PT; runoff; femoral femoral (arteries); femoral to peroneal artery; fem pop; fem fem; calf artery (arteries); common femoral; external iliac; common iliac artery; internal iliac arteries; iliac systems; origin of iliac; CFA; femoropopliteal artery; ileofemoral; aortobifemoral; axillobifemoral; aortobiiliac; aortobi iliac Key words for occlusive arterial disease: extensive collateral formation; collateral; occluded; occlusion; occludes; proximal occlusion; complete occlusion; one vessel runoff; one vessel run off; single vessel runoff; single vessel run off; high grade stenosis; high grade stenosis; severe atherosclerotic stenosis; significant stenosis; moderate stenosis; moderate focal stenosis; multi focus stenosis; moderate focal stenosis; severe narrowing; moderate narrowing; moderate atheromatous changes; moderate atheromatous plaque; not demonstrate flow; significant atheromatous plaque; severe plaque; significant atheromatous; moderate atheromatous changes; severe atherosclerotic disease; ASO; PTA; angioplasty; recanalization; endarterectomy Section 5: Use Of Medications For Claudication: Assess presence of medications for Claudication. Cilostozol (Pletal) or Pentoxifylline (Trental, Pentoxil, Pentopak). NHGRI U01 HG EMR Phenotypes and Community Engaged Genomic Associations Last Updated: July 8,
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