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PubMed2000

The prevalence of thromboembolic events among women with extended bed rest prescribed as part of the treatment for premature labor or preterm premature rupture of membranes.

OBJECTIVE: This study was undertaken to determine the prevalence of thromboembolic events among women with extended bed rest prescribed as part of the treatment of premature labor or preterm premature rupture of membranes. STUDY DESIGN: A retrospective chart review was undertaken of all women who had bed rest of >/=3 days' duration prescribed as part of the treatment of premature labor or preterm premature rupture of membranes in the Akron General Medical Center Perinatal Unit during the period January 1, 1997-December 31, 1998. The prevalence of thromboembolic events in this population was determined. The charts of all additional gravid women with antepartum or postpartum deep vein thrombosis or pulmonary embolism diagnosed during the study period were also reviewed. The prevalence of these disorders among the pregnant population for whom extended bed rest was not prescribed as part of the treatment of premature labor or preterm premature rupture of membranes was also calculated. Statistical comparison of the prevalences in the 2 populations was undertaken by means of the chi(2) analysis with the Fisher exact test. RESULTS: There were 192 patients admitted during the study period who had extended bed rest prescribed as part of the treatment of premature labor or preterm premature rupture of membranes. Three of these women had thromboembolic events, for a prevalence of 15.6 cases per 1000 women. Five additional gravid women were admitted for the treatment of deep vein thrombosis or pulmonary embolism. There were 6164 deliveries among women not treated with extended bed rest for premature labor or preterm premature rupture of membranes during this period. Thus the prevalence of these phenomena among the remaining pregnant women was 0.8 cases per 1000 women. The prevalences of these disorders in the 2 populations were highly significantly different. CONCLUSION: The prevalence of thromboembolic events among women for whom extended bed rest is prescribed as part of the treatment of premature labor or preterm premature rupture of membranes is significantly increased with respect to that among gravid women who do not receive this therapy and is substantially higher than previously reported. If this finding is confirmed in other populations, it may be prudent to undertake further studies to determine whether this prevalence can be reduced.

Bed Rest↗
PubMed2000

Management of venous thromboembolism in cancer patients.

Venous thromboembolism is a common complication in patients with cancer. The management of deep-vein thrombosis and pulmonary embolism can be a considerable challenge in these patients. Diagnosing venous thrombosis requires objective testing, and noninvasive investigations may be less accurate in patients who have cancer than in those who do not. Treatment of acute venous thrombosis at home with low-molecular-weight heparin is an attractive option in patients with malignant disease, in whom quality of life is especially important. Comorbid conditions, warfarin resistance, difficult venous access, and a potentially high bleeding risk are some of the factors that often complicate the prolonged course of anticoagulant therapy needed in this group. In addition, the use of central venous catheters is increasing, but the optimal treatment of catheter-related thrombosis remains controversial. This article reviews the current diagnostic and treatment approaches to venous thromboembolism in patients with cancer and provides several clinical scenarios to illustrate and discuss some common management problems.

Adult↗
PubMed2006

Arterial and venous thrombosis in rare congenital bleeding disorders: a critical review.

A thorough review of the literature and of personal files has allowed the gathering of 81 patients with rare congenital bleeding disorders and thrombotic phenomena. Sixteen of these patients had congenital afibrinogenemia, eight involved factor V deficiency, 20 factor VII defects, 33 factor XI deficiencies and only one, a factor XIII defect. Altogether 42 patients showed arterial thrombosis (myocardial infarction [MI] in 28 cases; ischemic stroke in 4; arterial occlusion in 8; 2 patients with disseminated intravascular coagulation (DIC)). Ages varied between 13 and 74. Twenty-two patients were males and 16 females. In four cases, sex was not reported. There were three fatalities: two after a MI and one because of heart failure. With regard to venous thrombosis: 9 patients had pulmonary embolism, 15 patients had deep vein thrombosis, 9 patients had both pulmonary embolism and deep vein thrombosis; 1 patient had superficial vein thrombosis, whereas, 5 cases had an unusual site venous thrombosis (two portal systems, two cerebral sinuses, one inferior vena cava) for a total of 39 cases. Age varied between 3 and 86. In this case, 20 patients were males and 17 were females. In two cases, sex was not reported. There were three fatalities: two because of pulmonary embolism and one because of inferior vena cava thrombosis. The fact that thrombosis has never been described in patients with factor II or factor X seems to underscore the central antithrombotic role that these two factors have in the coagulation system.

Adolescent↗
PubMed2000

[Sonographic diagnosis of thrombosis of the calf muscle veins and the risk of pulmonary embolism].

AIM: To determine the frequency of deep vein thrombosis in the veins of the calf muscles. The risk of embolism in relation to the localisation of thrombosis was also evaluated. METHOD: 357 consecutive patients submitted for colour Doppler sonography of the lower extremities were prospectively examined for deep vein thrombosis (DVT). Both axial and muscular calf veins were investigated. 184 of these patients underwent additional investigation for pulmonary embolism. RESULTS: Diagnosis of DVT was made by means of colour Doppler sonography in 179 patients. Soleal veins (n = 88), peroneal veins (n = 84), the popliteal vein (n = 69), and the superficial femoral vein (n = 53) were the most common sites of thrombosis. Thrombosis of the gastrocnemial veins (n = 49) occurred less frequently. 85 patients (47% of all patients having DVT) showed isolated calf vein thrombosis, in 45 patients (25%) the gastrocnemial and/or soleal veins were the only site of thrombosis. 60% of patients with symptomatic DVT also had pulmonary embolism. The embolic frequency for isolated calf vein thrombosis and muscular calf vein thrombosis was 48% and 50%, respectively. CONCLUSION: The veins of the calf muscles are a common site of acute DVT and a source of pulmonary embolism. They should always be investigated in patients with suspected DVT of the calf, and in patients with pulmonary embolism.

Adolescent↗
PubMed1996

D-dimer testing and acute venous thromboembolism. A shortcut to accurate diagnosis?

D-dimer fragments can be measured easily in plasma and whole blood, and the presence or absence of D-dimer could be useful in the diagnostic evaluation of venous thromboembolism. We systematically reviewed the English literature for articles that compared D-dimer results with those of other tests for deep venous thrombosis or pulmonary embolism. Twenty-nine studies were selected for detailed review, and we noted wide variability in assay performance, heterogeneity among subjects, and failure to define absence or presence of venous thromboembolism by a comprehensive criterion standard for diagnosis. These methodologic problems limit the generalizability of the published estimates of D-dimer accuracy for deep venous thrombosis or pulmonary embolism, and the clinical utility of this potentially important test remains unproved.

Acute Disease↗
PubMed2005

Deep venous thrombosis in patients with acute pulmonary embolism: prevalence, risk factors, and clinical significance.

STUDY OBJECTIVES: To determine the prevalence of lower-limb deep venous thrombosis (DVT) that can be detected by compression ultrasonography (CUS) in patients with symptomatic pulmonary embolism (PE) diagnosed with spiral CT pulmonary angiography (CTPA); and to explore the risk factors for positive CUS results and the prognostic significance of such findings. DESIGN: Post hoc analysis of data from a prospective multicenter outcome study of 1,041 patients with clinically suspected non-severe PE. All patients underwent CTPA and CUS within 24 h of enrollment and were followed up for 3 months. PATIENTS: Among the 290 patients with positive CT findings, CUS was diagnostic in 281 patients who constitute the study population. RESULTS: Mean age +/- SD was 64.3 +/- 17.7 years; 128 patients (44.8%) were men. DVT signs or symptoms were present in 90 patients (32%). CUS detected DVT in 169 patients (60.1%; 95% confidence interval [CI], 54.1 to 65.9%), including 127 patients (45.2%; 95% CI, 39.3 to 51.2%) with proximal DVT. Sensitivity and specificity of DVT symptoms for CUS-detectable DVT were 43% and 85%, respectively. Multivariate analysis showed that an age > or = 70 years (odds ratio [OR], 1.90; 95% CI, 1.14 to 3.17) and the presence of DVT signs or symptoms (OR, 4.12; 95% CI, 2.24 to 7.55) were independent risk factors for positive CUS results. DVT symptoms (OR, 4.78; 95% CI, 2.75 to 8.33) and a history of venous thromboembolism (OR, 2.59; 95% CI, 1.46 to 4.62) were independent risk factors for proximal DVT. The 3-month risk of recurrent thromboembolic event or death was not significantly different among patients with and without DVT (6.5% vs 2.7%, p = 0.15). CONCLUSION: These results do not support screening for DVT in patients with CTPA-proven symptomatic PE; however, they suggest that CUS might prove especially efficient and safe as a frontline test in elderly patients with suspected PE. Further studies are needed before these conclusions can be translated into clinical recommendations.

Acute Disease↗
PubMed1992

[A surgically treated case of acute pulmonary embolism owing to deep vein thrombosis of the leg mainly caused by uterine myoma].

A 49-year-old woman with deep vein thrombosis of the left leg suddenly complained of slight dyspnea during her hospitalization. Enhanced chest CT and pulmonary arterial DSA revealed pulmonary emboli, while phlebography of the left leg and lower abdominal CT showed a uterine myoma compressing the left external iliac vein, which was regarded as a chief cause of deep vein thrombosis of the left leg. The patient became dyspneic severely with a rapid increase of pulmonary arterial pressure and a decrease of arterial oxygen pressure. Therefore, pulmonary embolectomy and deep vein thrombectomy of the left leg and pelvis was performed using a cardiopulmonary bypass. Hysterectomy was also performed after weaning the bypass. The postoperative course was uneventful without recurrence of pulmonary embolism. This was a very rare case of pulmonary embolism, because, as far as we investigated, no literature has reported deep vein thrombosis of the leg caused by uterine myoma. We emphasize the availability of the enhanced CT for diagnosis of pulmonary embolism.

Acute Disease↗
PubMed2006

A prospective observational study of a cohort of outpatients with an acute medical event and reduced mobility: incidence of symptomatic thromboembolism and description of thromboprophylaxis practices.

OBJECTIVES: The study was performed to determine the incidence of symptomatic venous thromboembolism in outpatients with an acute medical event causing temporary reduced mobility. Risk factors for venous thromboembolism and thromboprophylaxis practices were also studied. DESIGN: This was a prospective, observational, multicentre, cohort study. SETTING: General practitioners randomly selected from a registry of 25,000 active representative doctors in France including eligible outpatients. SUBJECTS: Outpatients aged at least 40 years anticipated to have reduced mobility for at least 48 h due to an acute medical event were eligible. INTERVENTIONS: None required. MAIN OUTCOME MEASURES: Symptomatic deep-vein thrombosis and pulmonary embolism at 3 weeks were the main study end-points. RESULTS: Overall, 16,532 evaluable patients of mean age 71 years were recruited between October 2002 and June 2003 by 2895 doctors. The main acute medical events leading to reduced mobility were infection, acute rheumatism and falls without fracture. The incidence rates (95% confidence interval) of symptomatic deep-vein thrombosis and pulmonary embolism were 1% (0.84-1.14) and 0.20% (0.13-0.27) respectively. Venous insufficiency in legs, cancer, and a personal or family history of venous thromboembolism were independent risk factors for venous thromboembolism. Pharmacological thromboprophylaxis was initiated in 35.0% (n=5782) of the patients. The principal driver of prescription was a personal history of venous thromboembolism. CONCLUSIONS: The risk of symptomatic venous thromboembolism in outpatients with reduced mobility for medical reasons is close to that reported in medical and surgical inpatients. This risk and the potential need for thromboprophylaxis should be taken into account by primary care doctors.

Acute Disease↗
PubMed1998

Incidence and time course of thromboembolic outcomes following total hip or knee arthroplasty.

BACKGROUND: Little is known about the incidence and time course of clinical thromboembolic events after total hip or knee arthroplasty, particularly after hospital discharge. METHODS: We used a linked hospital discharge database provided by the State of California to identify cases diagnosed as having deep vein thrombosis or pulmonary embolism within 3 months of unilateral total hip or knee arthroplasty. Also, we surveyed orthopedic surgeons to estimate the frequency of postoperative thromboprophylaxis during July 1991 through June 1993. Medical charts were audited to determine the accuracy of the coded records. RESULTS: Among 19,586 primary hip and 24,059 primary knee arthroplasties, the cumulative incidence of deep vein thrombosis or pulmonary embolism within 3 months of surgery was 556 (2.8%) after hip arthroplasty and 508 (2.1%) after knee arthroplasty. The diagnosis of thromboembolism was made after hospital discharge in 76% and 47% of the total hip and total knee arthroplasty cases, respectively (P<.001), with a median time of diagnosis of 17 days and 7 days after surgery, respectively (P<.001). Questionnaire results indicated that 95% of all cases received thromboprophylaxis and that the frequency, type, and duration of thromboprophylaxis was virtually identical after hip and knee arthroplasty. CONCLUSIONS: There is a difference in the temporal patterns of clinically symptomatic thromboembolic complications after total hip and total knee arthroplasty, suggesting differences in pathogenesis or natural history. The findings suggest that to further reduce thromboembolic outcomes, earlier, more intense prophylaxis may be needed for total knee arthroplasty, and more prolonged prophylaxis may be required after total hip arthroplasty.

Aged↗
PubMed2000

Venous thromboembolic complications in obstetrics and gynecology with a focus on the role of low molecular weight heparin.

Venous thromboembolism is a major cause of morbidity, mortality, and economic expense in the field of obstetrics and gynecology. Without prophylaxis, as many as 30% of at-risk patients will suffer deep vein thrombosis, and nearly 1% of these patients will succumb to a fatal pulmonary embolism. Both deep venous thrombosis and pulmonary embolism manifest few specific symptoms, and the presentation of these entities is often clinically silent. Therefore, a prophylactic approach is preferred. We review the pathophysiology, risk factors, prophylactic choices, and treatment of venous thromboembolic complications for the general obstetric and gynecology population. We focus on the role of low molecular weight heparin because of its convenient dosing and favorable risk/benefit profile.

Journal Article↗
PubMed1992

Prevalence of venous disease: a community study in west London.

OBJECTIVE: To find out the prevalence of venous disease in patients aged between 35 and 70 years. DESIGN: Self-administered questionnaire. SETTING: Community study in west London, England. SUBJECTS: A random sample of 2,103 patients aged between 35 and 70 years who were registered with three general practices. RESULTS: 1,338 (64%) subjects filled in the questionnaires. Of these, 323/1,303 (25%) said that they had varicose veins, 81/1,338 (6%) had a deep vein thrombosis or pulmonary embolism, and 52/1,336 (5%) said that they had had phlebitis. In addition, 94/1,326 (7%) had worn support stockings, and 84/1,304 (6%) had been treated with anticoagulants at some time; 31% of responders reported that they had had some form of venous disease. CONCLUSIONS: Increased age and female sex were independent risk factors for varicose veins and phlebitis. Thrombosis and pulmonary embolism were both significantly associated with the presence of diabetes, female sex, and increased age. The facts that a quarter of the sample had varicose veins, and that nearly a third had had venous disease of some kind at some time, suggest that venous disease may place a heavier burden on health resources than had been realised.

Adult↗
PubMed2002

Diagnosing deep vein thrombosis in the lower extremity: correlation of clinical and duplex scan findings.

OBJECTIVE: To identify factors that predict a positive duplex scan examination result in patients with suspected deep vein thrombosis of the lower extremity. DESIGN: Retrospective study. SETTING: Vascular laboratory in a university teaching hospital. PATIENTS AND METHODS: The results of 345 lower extremity duplex venous scans performed between August 1994 and November 1998 were reviewed. All patients were in-patients referred from different specialties due to clinical suspicion of lower extremity deep vein thrombosis. Positive duplex scans were correlated with patients' demographic data (sex, age), medical history (history of malignancy, deep vein thrombosis, and pulmonary embolism) and clinical features (leg swelling, venous insufficiency, calf pain, and leg ulcer). Univariate analysis was performed using the Chi squared test. RESULTS: A total of 345 scans were performed for 313 patients. The mean age was 55 years (range, 19-92 years). Sixty-three patients (49 male, 14 female) had a positive scan, giving a yield of 18.3%. Four factors had a significant association with a positive scan: male sex (P=0.0102), history of malignancy (P=0.0040), history of deep vein thrombosis (P=0.0001), and history of pulmonary embolism (P=0.0265). CONCLUSIONS: Common presenting clinical features do not predict the result of ultrasonographic investigation for deep vein thrombosis. The chance of having a positive scan is significantly higher in male patients and those with a history of malignancy, deep vein thrombosis, or pulmonary embolism.

Adult↗
PubMed1996

Serial duplex ultrasound examinations for deep vein thrombosis in patients with suspected pulmonary embolism.

PURPOSE: We have prospectively evaluated the need for serial venous duplex ultrasound examinations in an inpatient population with an initially normal study result. METHODS: Patients were selected for study on the basis of clinical suspicion of pulmonary embolism and possible lower extremity deep vein thrombosis, a comorbid condition contributing to a nondiagnostic ventilation/perfusion lung scan, and an initially normal bilateral venous duplex ultrasound examination that included complete evaluation of the femoropopliteal system and the deep calf veins. Repeat duplex examinations were done during the same hospital admission between 5 and 14 days after the initial study. RESULTS: Ninety-four patients with an initially normal duplex ultrasound examination result had repeat studies done at an average of 7.9 +/- 2.6 days. Ninety-two examination results remained normal bilaterally. Two patients had isolated intramuscular calf vein deep vein thrombosis: one in the gastrocnemius system of both calves with associated calf tenderness at 11-day follow-up and one in a mid-calf soleal vein without associated symptoms at 10 days. No patients had any evidence of deep vein thrombosis in the femoropopliteal or tibioperoneal venous systems. CONCLUSIONS: Serial follow-up duplex ultrasound evaluation is unnecessary after an initially complete, normal study in patients with symptoms who have suspected pulmonary embolism and nondiagnostic ventilation-perfusion lung scans.

Adult↗
PubMed1998

The incidence of symptomatic venous thromboembolism during and after prophylaxis with enoxaparin: a multi-institutional cohort study of patients who underwent hip or knee arthroplasty. Canadian Collaborative Group.

BACKGROUND: Despite low molecular weight heparin prophylaxis, the incidence of venographically detected, residual deep vein thrombosis after hip and knee arthroplasty remains high, at approximately 15% and 30%, respectively. Most of these thrombi are asymptomatic and of unknown clinical significance. Nevertheless, because they have the potential to grow, limiting prophylaxis to the in-hospital period may provide inadequate protection. METHODS: We studied a cohort of 1984 consecutive patients who had hip or knee arthroplasty at 1 of 28 participating hospitals. Patients received enoxaparin prophylaxis, 30 mg subcutaneously every 12 hours for up to 14 days, and underwent predischarge compression ultrasonography. Study end points were symptomatic deep vein thrombosis or pulmonary embolism during and after prophylaxis, asymptomatic venous thrombosis detected by predischarge compression ultrasonography, and major hemorrhage. The duration of follow-up was 84 days. RESULTS: Enoxaparin treatment was started a mean (+/- SD) of 17.9 +/- 10.4 hours after the completion of surgery and was given for a mean of 18.0 +/- 6.9 doses. Eighty-two patients (4.1%; 95% confidence interval, 3.3%-5.0%) developed venous thromboembolism. The rates of thromboembolic events during and after prophylaxis were 2.1% and 2.0%, respectively. Only 3 patients (0.15%) had abnormal predischarge compression ultrasonography. Three patients (0.15%) died of pulmonary embolism. Major hemorrhage occurred in 58 patients (2.9%; 95% confidence interval, 2.2%-3.7%). CONCLUSIONS: Postoperative prophylaxis with enoxaparin for a mean of 9 days is associated with a clinically acceptable rate of symptomatic venous thromboembolism and major hemorrhage. Predischarge compression ultrasonography cannot be justified.

Adult↗
PubMed2004

Medical management of venous thromboembolic disease.

Venous thromboembolic disease (deep vein thrombosis and pulmonary embolism) are common disorders with serious morbid and mortal complications. Given the varied modes of presentation, a high clinical index of suspicion in patients at risk must exist among physicians. Standard therapy has consisted of intravenous unfractionated heparin and overlapping administration of an oral Vitamin K antagonist, commonly Warfarin. Although an effective strategy, many practical limitations exist, including the need for prolonged hospitalization, frequent laboratory monitoring for anticoagulant effect, and erratic dose-response curves. Recently, subcutaneous low-molecular-weight heparins have emerged as safe and effective alternatives for unfractionated heparin. Appropriate patients may be treated with low-molecular-weight heparins and oral Warfarin entirely as outpatients, with similar efficacy and risk of recurrent thromboembolic events and hemorrhage. Thrombolytic therapy is a reasonable alternative in patients with iliofemoral venous thrombosis and/or pulmonary embolism resulting in hemodynamic compromise or obstructing significant pulmonary vasculature. Risks of serious hemorrhagic side effects including intracranial hemorrhage, along with the added economic burden, have limited widespread acceptance of thrombolytic therapy as primary treatment. Emerging oral direct thrombin inhibitors and other novel agents stand to move the treatment of patients with venous thromboemboli to even greater levels of safety and efficacy.

Anticoagulants↗
PubMed1989

A randomized trial of less intense postoperative warfarin or aspirin therapy in the prevention of venous thromboembolism after surgery for fractured hip.

A randomized trial was carried out with 194 patients to compare the effectiveness of sodium warfarin or aspirin with that of placebo in the prevention of venous thromboembolism after surgery for fractured hip. Prophylaxis was commenced postoperatively and continued for 21 days or until patient discharge, whichever was earlier. All patients underwent surveillance with iodine 125-fibrinogen leg scanning and impedance plethysmography, with subsequent venography. Venous thromboembolism occurred in 13 patients (20.0%) in the warfarin group, 27 patients (40.9%) in the aspirin group, and 29 patients (46.0%) in the placebo group. Proximal vein thrombosis or pulmonary embolism occurred in 6 patients (9.2%) in the warfarin group, 7 patients (10.6%) in the aspirin group, and 19 patients (30.2%) in the placebo group. The results of this study show that sodium warfarin therapy is safe and effective in preventing thromboembolic complications in patients undergoing surgery for fractured hip, and that aspirin therapy is an equally safe and effective method for preventing proximal vein thrombosis or pulmonary embolism.

Adult↗
PubMedDate not supplied

[Acute superficial thrombophlebitis--modern diagnosis and therapy].

Acute superficial thrombophlebitis of the lower extremities is one of the most common vascular diseases affecting the population. Although it is generally considered as a benign disease, it can be extended to the deep venous system and pulmonary embolism. We examined 50 patients (22 males and 28 females), mean age 52.5 years. These patients were surgically treated due to acute superficial thrombophlebitis of the lower limbs that affected great saphenous vein above the knee. The diagnosis was made by palpable subcutaneous cords in the course of great saphenous vein or its tributaries in association with tenderness, erythema and oedema. Of these 50 patients, 26 were examined by duplex ultrasonography before the operation. In 20 patients duplex scanning confirmed that the process was greater than we supposed after clinical examination (77%) and in 6 patients there were no differences (23%) (Figures 1 and 2). The operation included crossectomy, ligation and resection of the proximal part of the great saphenous vein. Intraoperative findings in 38 patients showed that the level of the phlebitic process was higher than the clinical level (76%). There was no difference in 12 patients (24%). Deep vein thrombosis and pulmonary embolism were noted in 14 patients (28%) (Tables 1 and 2). Both complications were found in two patients, and 12 had one of these complications. Generally, there were 12 patients with deep venous thrombosis and 4 patients with pulmonary embolism. Only in one patient deep venous thrombosis appeared postoperatively, while all other complications occurred before surgical intervention (Scheme 1 and Table 3). The most common risk factor was the presence of varicose veins (86%). Obesity, age over 60 years, cigarette smoking are listed in decreasing order of frequency. Patients under 60 years were more likely to have complications while older patients usually followed a benign clinical course (Tables 4 and 5). There was no intrahospital mortality. Average hospitalization was 5.7 days. It was 4 days in patients without complications. After thes urgent operation that practically removed the risk of potentially fatal consequences, the patients were dismissed from hospital. New hospitalization was recommended after two weeks when the second act of surgical treatment was performed. It included stripping of the great saphenous vein and extirpation of varicose veins in the area without acute inflammation. The findings of this study confirm the general opinion that acute superficial thrombophlebitis is a very common vascular disease with usually "benign" clinical course. In its ascending form that affects the great saphenous vein above the knee it can be associated with deep venous thrombosis and pulmonary embolism. The level of phlebitic process is usually much higher than can be palpated clinically. Duplex scanning was a highly reliable, precise, fast non-invasive diagnostic method that is necessary in examining, following and making decision for operative treatment of acute superficial thrombophlebitis. If suspected complications an urgent surgical intervention should be performed. It is short and efficient, contributing to the fast recovery of the patients and their return to normal activities.

Acute Disease↗