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A review on fuzzy fractional order modeling in health systems with application to cardiovascular disease Cover

A review on fuzzy fractional order modeling in health systems with application to cardiovascular disease

Open Access
|Mar 2026

Figures & Tables

Fig. 1

Schematic diagram.

Fig. 2

Flow chart of numerical scheme.

Fig. 3

Simulation of the Model Compartments at fractional order γ = 1.00.

Fig. 4

Simulation of the Model Compartments at fractional order γ = 0.95.

Fig. 5

Simulation of the Model Compartments at fractional order γ = 0.90.

Fig. 6

Simulation of the Model Compartments at fractional order γ = 0.85.

Fig. 7

Simulation of the Model Compartments at fractional order γ = 0.80.

Fig. 8

Fuzzy envelope of S(t).

Fig. 9

Fuzzy envelope of HA (t).

Fig. 10

Fuzzy envelope of HC(t).

Fig. 11

Fuzzy envelope of I(t).

Fig. 12

Fuzzy envelope of T(t).

Fig. 13

Fuzzy envelope of R(t).

Fig. 14

Fuzzy Surface S(t).

Fig. 15

Fuzzy Surface HA(t).

Fig. 16

Fuzzy Surface I(t).

Fig. 17

Fuzzy Surface I(t).

Fig. 18

Fuzzy Surface T(t).

Fig. 19

Fuzzy Surface R(t).

Simulation results of the model at different time points at γ = 0_80_

TimeSHAHCITR
0500.000035.000020.000041.000015.000015.0000
104.284079.656529.786235.880022.76654.7281
154.578155.605921.469924.716818.16253.3692
204.740642.628817.453818.815214.63622.5637
254.843234.877015.066215.322812.08382.0453
304.914029.850613.472313.066610.23381.6909
354.965926.374412.326611.50748.86931.4370
405.005623.845311.460210.37207.84081.2480
455.037121.929710.78009.51057.04811.1028
505.062620.430910.23068.83526.42420.9884

Simulation results of the model at different time points at γ = 0_85_

TimeSHAHCITR
0500.000035.000020.000041.000015.000015.0000
104.220168.566821.689830.347421.80694.0770
154.597844.180615.561319.269516.19362.6871
204.787232.370512.756414.018412.23551.9164
254.899825.917611.131411.17319.59611.4518
304.974322.015110.06389.45437.82521.1527
355.027019.45509.30548.32396.60740.9494
405.066317.66468.73707.53025.74420.8050
455.096716.34798.29416.94395.11320.6982
505.120815.34057.93876.49354.63840.6166

Parameters’ descriptions_

ParameterDescription
PRate at which individuals enter the population
β˜1{{\tilde \beta }_1}Natural death rate in each compartment
β˜2{{\tilde \beta }_2}Transition rate from chronic cases to heart-attack cases
β˜3{{\tilde \beta }_3}Contact rate of S(t) with HC(t)
β˜4{{\tilde \beta }_4}Contact rate of S(t) with I(t)
β˜5{{\tilde \beta }_5}Rate at which recovered individuals become susceptible again
β˜6{{\tilde \beta }_6}HA(t)’s treatment rate
β˜7{{\tilde \beta }_7}HC(t)’s treatment rate
β˜8{{\tilde \beta }_8}I(t)’s treatment rate
β˜9{{\tilde \beta }_9}Disease-induced death rate for infected individuals
β˜10{{\tilde \beta }_{10}}Transition rate from chronic cases to infected cases
β˜11{{\tilde \beta }_{11}}Rate at which treated individuals move to the recovered class
β˜12{{\tilde \beta }_{12}}Disease-induced death rate for heart-attack individuals

Initial conditions and parameters’ values [100]_

VariableInitial conditionParameterValueParameterValue
S (0)500β˜1{\widetilde \beta _1}0.2β˜7{\widetilde \beta _7}0.01
Ha (0)35β˜2{\widetilde \beta _2}0.486β˜8{\widetilde \beta _8}0.09
Hc (0)20β˜3{\widetilde \beta _3}0.1679β˜9{\widetilde \beta _9}0.019
I (0)41β˜4{\widetilde \beta _4}0.0003β˜10{\widetilde \beta _{10}}0.1981
T (0)15β˜5{\widetilde \beta _5}0.003β˜11{\widetilde \beta _{11}}0.001
P (0)15β˜6{\widetilde \beta _6}0.001β˜12{\widetilde \beta _{12}}0.09
P5

Crisp and fuzzy bounds of all compartments for different fractional orders_

Fractional OrderCompartmentCrispFuzzy MinFuzzy Max
1S3.9185 × 10101.6155 × 10108.0882 × 1010
1HA3.2297 × 1062.0615 × 1064.6590 × 106
1HC000
1I1.3390 × 1068.8027 × 1051.8464 × 106
1T650064090594657
1R1812.41449.92174.9
0.95S2.4488 × 10101.0091 × 10105.0562 × 1010
0.95HA2.3017 × 1061.4691 × 1063.3202 × 106
0.95HC000
0.95I9.4477 × 1056.2001 × 1051.3074 × 106
0.95T463522917167488
0.95R1226.2980.941471.4
0.9S1.5186 × 10106.2546 × 1093.1366 × 1010
0.9HA1.6308 × 1061.0410 × 1062.3526 × 106
0.9HC000
0.9I6.6342 × 1054.3469 × 1059.2108 × 105
0.9T328652068747845
0.9R815.41652.33978.49
0.85S9.3413 × 1093.8451 × 1091.9302 × 1010
0.85HA1.1486 × 1067.3316× 1051.6569 × 106
0.85HC000
0.85I4.6350 × 1053.0326 × 1056.4540 × 105
0.85T231661458533720
0.85R531424.8637.2
0.8S5.6979 × 1092.3438 × 1091.1779 × 1010
0.8HA8.0394 × 1055.1316× 1051.1597 × 106
0.8HC000
0.8I3.2208 × 1052.1045 × 1054.4967 × 105
0.8T162301022123621
0.8R336.82269.46404.19

Simulation results for the model compartments over time at γ = 1_

TimeSHAHCITR
0500.000035.000020.000041.000015.000015.0000
105.508331.08914.079112.431217.29062.0702
155.304912.87004.42434.89268.55150.7879
205.32778.63534.39343.27704.37040.3041
255.32497.64474.39652.92882.62530.1204
305.32527.41284.39612.85371.94010.0505
355.32527.35854.39612.83741.67900.0239
405.32527.34574.39602.83391.58120.0137
455.32527.34274.39602.83311.54490.0099
505.32527.34204.39602.83301.53150.0084

Simulation results of the model compartments over time at γ = 0_90_

TimeSHAHCITR
0500.000035.000020.000041.000015.000015.0000
104.260156.749014.743824.574320.59653.4152
154.701333.052610.814314.062513.92892.0238
204.894723.11649.11289.76429.66981.3170
255.001618.31318.14767.70237.11290.9273
305.068715.66907.52166.56375.56490.6969
355.114314.04707.08125.85974.59640.5516
405.147112.96356.75375.38513.96460.4546
455.171712.19106.50035.04383.53390.3865
505.190711.61236.29814.78643.22770.3366

Simulation results of the model compartments over time γ = 0_95_

TimeSHAHCITR
0500.000035.000020.000041.000015.000015.0000
104.502544.28748.933118.609019.10612.7453
154.925222.51437.12709.225611.37881.3878
205.072515.13136.37536.15707.01690.7761
255.147012.20515.95284.95374.74880.4813
305.190610.82925.68114.38213.56890.3289
355.218810.07045.49144.06062.93220.2443
405.23819.59475.35133.85502.56880.1935
455.25219.26745.24363.71122.34720.1608
505.26269.02695.15813.60452.20290.1383
Language: English
Submitted on: Jan 15, 2026
Accepted on: Feb 20, 2026
Published on: Mar 18, 2026
Published by: Harran University
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year

© 2026 Kottakkaran Sooppy Nisar, Muhammad Farman, published by Harran University
This work is licensed under the Creative Commons Attribution 4.0 License.

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