EchocardiographyExercise StressMiscEchocardiography
Aortic Valve Velocity RatioLV EF (Modified Quinones Equation)Myocardial Performance Index (RV)
AVA (Continuity Equation VTI)LV EF (Simplified Quinones Equation)PCWP by E/Ea (Nagueh Formula)
AVA (Continuity Equation VMax)LV Fractional ShorteningPISA (Mitral regurgitation)
dP/dt (LV contractility)LV Mass and LV Mass IndexPISA (Mitral stenosis)
dP/dt (RV contractility)Mitral valve area (PHT)Qp/Qs
Left atrial pressure (MR)Mitral Valvuloplasty Score (MGH)RVSP (TR)
LA Volume (Biplane Method)Modified Bernoulli EquationStroke Volume, Cardiac Output
LV EF (Dumesnil Method)Myocardial Performance Index (LV)
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Duke Treadmill Score

Calculation


Ex Time
: Max ST
Min Sec mm
Angina Index
0. No angina during exercise
1. Non-limiting angina
2. Exercise limited angina


DTS
Risk
Risk Category
Men Women
1-Yr Mortality
No Stenosis >=75%
1 VD >=75%
2 VD >=75%
3VD >=75% or LM >=75%
Calculate

Clear
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Information

The Duke Treadmill Score (DTS) is a weighted index combining treadmill exercise time using standard Bruce protocol, maximum net ST segment deviation (depression or elevation), and exercise-induced angina. It was developed to provide accurate diagnostic and prognostic information for the evaluation of patients with suspected coronary heart disease. The typical observed range of DTS is from -25 (highest risk) to +15 (lowest risk). A low DTS is actually better at excluding ischemic heart disease in women than men.

DTS = Exercise Time - (5 x Max ST) - (4 x Angina Index)

Ex Time Treadmill exercise time
Max ST Maximum net ST deviation (except aVR)
Angina Index Treadmill angina index
0. No angina during exercise
1.

Non-limiting angina

2. Exercise limited angina

DTS Duke treadmill score
Risk
>=+5 Low risk
+4 to -10

Moderate risk

<= -11 High risk

DTS Risk Category

1-Yr Mortality

No Stenosis >=75%

1 VD >=75%

2 VD >=75%

3VD >=75% or LM >=75%

Men

Low  

0.9%

52.6%

22.4%

13.6%

11.4%

Mod  

2.9%

17.8%

15.6%

27.9%

38.7%

High

8.3%

1.8%

9.1%

17.5%

71.5%

Women

Low  

0.5%

80.9%

9.4%

6.2%

3.5%

Mod  

1.1%

65.1%

14.2%

8.3%

12.4%

High

1.8%

10.8%

18.9%

24.3%

46%

VD = Vessel Disease;  LM = Left Main
References


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