Description (from AHA Heart & Stroke Encyclopedia)

Ischemia (is-KE'me-ah) is a condition in which the blood flow (and thus oxygen) is restricted to a part of the body. Cardiac ischemia is the name for lack of blood flow and oxygen to the heart muscle. Thus, the term 'ischemic heart disease' refers to heart problems caused by narrowed heart arteries. When arteries are narrowed, less blood and oxygen reaches the heart muscle. This is also called coronary artery disease and coronary heart disease. It can ultimately lead to heart attack.

ICD-9-CM CODES (Tomiak et al, 2000)

410 Acute myocardial infarction
411 Other acute and subacute forms of ischemic heart disease
412 Old myocardial infarction
413 Angina pectoris
414 Other forms of chronic ischemic heart disease

410 Acute myocardial infarction
411 Other acute and subacute forms of ischemic heart disease
412 Old myocardial infarction
413 Angina pectoris
414 Other forms of chronic ischemic heart disease

FORMATS:

$DXnr_cm and $DXn_cL for Roos and Mustard's definition. These formats also define a number of other diagnostic categories used in their paper.

PROGRAMMING NOTES:

Leonard MacWilliam forwarded the following SAS code which should be used in conjunction with the above formats.

*** SAS code to select the first four char. of the PRIMARY diag. field

** and define two diagnoses variables **;

DIAG = substr(dx01,1,4) ;

nprcam = input(put(diag,$DXnr_cm.),2.) ;

*** define conditions used in NPR & Cams paper ***;

• ICD-9-CM manual effective October 1, 1994 in the US; effective April 1, 1995 in Canada.



• Roos N and Mustard C (1997):"Variation in health and health care use by socio-economic status in Winnipeg, Canada: The system works well? Yes and no." Milbank Quarterly;75(1):89-111



• Tomiak M, Berthelot J, Guimond E & Mustard C(2000). Factors associated with nursing-home entry for elders in Manitoba, Canada. Journal of Gerontology: Medical Sciences, 55A(5), M279-M287. [abstract]