Table 8. Short-term risk of death or nonfatal myocardial infarction in patients with unstable angina

High risk          Intermediate risk   Low risk
______________________________________________________________
At least one of    No high-risk        No high- or
the following      feature but must    intermediate- risk
features must be   have any of the     feature but may have
present:           following:          any of the following
                                       features:
______________________________________________________________
Prolonged          Prolonged (>20      Increased angina
ongoing (>20       mins) rest          frequency, severity, or
mins) rest pain    angina, now         duration
                   resolved, with
                   moderate or high
                   likelihood of CAD
______________________________________________________________
Pulmonary edema,   Rest angina (>20    Angina provoked at a
most likely        mins or relieved    lower threshold
related to         with rest or
ischemia           sublingual
                   nitroglycerin)
______________________________________________________________
Angina at rest     Nocturnal angina    New onset angina with
with dynamic ST                        onset 2 weeks to 2
changes >e;1 mm                         months prior to
                                       presentation
______________________________________________________________
Angina with new    Angina with         Normal or unchanged ECG
or worsening MR    dynamic T-wave
murmur             changes
Angina with S3     New onset CCSC[1]
or new/worsening   III or IV angina
rales              in the past 2
                   weeks with
                   moderate or high
                   likelihood of CAD
______________________________________________________________
Angina with        Pathologic Q
hypotension        waves or resting
                   ST depression <e;1
                   mm in multiple
                   lead groups
                   (anterior,
                   inferior,
                   lateral)
______________________________________________________________
                   Age >65 years
______________________________________________________________

[1] CCSC = Canadian Cardiovascular Society classification.
Note: Estimation of the short-term risks of death and nonfatal MI
in unstable angina is a complex multivariable problem that cannot
be fully specified in a table such as this.  Therefore, the table
is meant to offer general guidance and illustration rather than
rigid algorithms.