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    New onset hypertension after transplantation

    2022-07-29 05:41:40MahmoudNassarNsoNsoSofiaLakhdarRavaliKondaveetiChandanButtarHarangadBhangooMahmoudAwadNaveenSiddiqueSheikhKarimSolimanMostSirajumMuniraFarshidRadparvarVincentRizzoAhmedDaoud
    World Journal of Transplantation 2022年3期

    Mahmoud Nassar, Nso Nso, Sofia Lakhdar, Ravali Kondaveeti, Chandan Buttar, Harangad Bhangoo,Mahmoud Awad, Naveen Siddique Sheikh, Karim M Soliman, Most Sirajum Munira, Farshid Radparvar,Vincent Rizzo, Ahmed Daoud

    Mahmoud Nassar, Nso Nso, Sofia Lakhdar, Ravali Kondaveeti, Chandan Buttar, Harangad Bhangoo, Vincent Rizzo, Department of Medicine, Icahn School of Medicine at Mount Sinai (NYC Health and Hospitals: Queens), New York, NY 11432, United States

    Mahmoud Awad, Department of Medicine, The Memorial Souad Kafafi University Hospital, 6th of October - Giza 0000, Egypt

    Naveen Siddique Sheikh, Department of Physiology, CMH Lahore Medical College and Institute of Dentistry, Lahore - Punjab 0000, Pakistan

    Karim M Soliman, Department of Medicine, Medical University of South Carolina, Charleston, SC 29425, United States

    Most Sirajum Munira, Farshid Radparvar, Division of Cardiology, Department of Medicine, Icahn School of Medicine at Mount Sinai (NYC Health and Hospitals: Queens), New York, NY 11432, United States

    Ahmed Daoud, Department of Medicine, Kasr Alainy Medical School, Cairo University, Cairo 11211, Egypt

    Abstract It has been reported that up to 90% of organ transplant recipients have suboptimal blood pressure control. Uncontrolled hypertension is a well-known culprit of cardiovascular and overall morbidity and mortality. In addition, rigorous control of hypertension after organ transplantation is a crucial factor in prolonging graft survival. Nevertheless, hypertension after organ transplantation encompasses a broader range of causes than those identified in non-organ transplant patients. Hence, specific management awareness of those factors is mandated. An in-depth understanding of hypertension after organ transplantation remains a debatable issue that necessitates further clarification. This article provides a comprehensive review of the prevalence, risk factors, etiology, complications, prevention, and management of hypertension after organ transplantation.

    Key Words: New onset; Hypertension; Organ; Transplantation; Renal

    INTRODUCTION

    The systolic blood pressure of more than 130 mmHg or diastolic blood pressure of above 80 mmHg leads to the development of hypertension requiring medical managementviaantihypertensive medications[1]. The primary and secondary blood pressure elevations potentially increase the risk of various cardiovascular complications. Secondary hypertension develops under the impact of several morbidities and comorbidities. Organ transplantation based on heart, kidney, lung, bone marrow, and liver predisposes 70%-90% of the treated patients to hypertension that potentially impacts their overall survival[2]. The development of posttransplant hypertension also leads to graft-related complications. The systematic prevention and control of organ transplant-related hypertension are paramount to reducing the risk of morbidity/mortality. This review elaborates on the complications, etiology, risk factors, prevalence, incidence, and medical management of hypertension occurring after organ transplantation.

    KIDNEY TRANSPLANTATION

    Most of renal transplant recipients are already hypertensive before transplant. The prevalence of hypertension in end stage renal disease is around 70%-80%. Hypertension improves in some patients after renal transplantation with the improvement of the renal functions, many patients continue to have renal transplantation related hypertension after transplantation[3].

    The renal transplantation-related hypertension prevalence among 47%-82% of children and 50%-80% adults potentially deteriorate their prognostic outcomes. However, the variations in hypertension prevalence between the patient populations potentially deteriorate their medical management and treatment outcomes. More than 27.6% of patients experience hypertension within one year of their organ transplantation. The utilization of immunosuppressants, organ rejection, graft dysfunction, long surgery duration, and advanced donor age are the significant factors that increase the risk of organ transplantation-related hypertension[4]. Other predisposing factors include post-biopsy arteriovenous fistula, post-transplantation glomerulonephritis/renal artery stenosis, and family history of hypertension among organ donors[5].

    HEART TRANSPLANTATION

    Seventy percent of patients who receive heart transplants experience hypertension and its clinical complications[6]. The elderly hypertensive patients with heart transplant status often experience a marked reduction in estimated glomerular filtration rate and elevation in serum creatinine levels. The findings by United Network for Organ Sharing database indicate hypertension predisposition among heart transplant recipients with age sixty years or above compared to other age groups[7]. The clinical studies reveal a reduction in hypertension incidence among patients who undergo heterotrophic cardiac transplants[8]. The patients who receive an orthotopic heart transplant, however, experience a high risk for hypertension. The obese patients undergoing heart transplantation also remain highly predisposed to hypertensive heart disease. The dependence on steroids, calcineurin inhibitors, and other immunosuppressants further increase the risk of hypertension among heart transplant recipients. Medical literature correlates 70%-90% incidence of hypertension with the use of calcineurin inhibitors among heart transplant patients[9].

    LUNG TRANSPLANTATION

    A reportable number of patients develop new-onset/episodic hypertension after undergoing lung transplantation. Medical literature confirms the cumulative prevalence of new-onset hypertension among 45% (at one year), 56% (at two years), and 63% (at three years) of lung transplant recipients. These patients frequently develop comorbidities, including diabetes mellitus and hypercholesterolemia[10]. The lung transplant patients who receive cyclosporine treatment or encounter blood pressure elevation (before transplant) also develop hypertension in many clinical scenarios[11].

    LIVER TRANSPLANTATION

    Liver transplantation is the gold standard in a patient with end-stage liver disease. Immunosuppressive therapy is required to reduce rejection after transplantation[12]. Unfortunately, more than half of the liver transplant patients develop hypertension that impacts their prognosis and treatment outcomes six months after surgery. In addition, post-transplant hypertension develops among liver transplant patients based on their calcineurin inhibitor/steroid use, family history of hypertension, obesity, and older age. However, the tacrolimus use, and race of liver transplantation patients do not increase their risk for episodic hypertension[13].

    BONE MARROW TRANSPLANTATION

    Approximately 2.4% of bone marrow transplant recipients develop pulmonary hypertension that potentially deteriorates their quality of life, life expectancy, and quality-adjusted life-years[14]. The progressive elevation in pulmonary vascular resistance often triggers right ventricular dysfunction and mortality among bone marrow transplant patients. Hemopoietic cell transplantation among adults and children predisposes them to systemic hypertension during the initial two years of their recovery. Sixtyone percent of adults/children experience new-onset hypertension within one month of their hemopoietic cell transplant[15,16].

    Etiology

    The surgical interventions, immunosuppressive therapy/immune system deterioration, and recipient/donor factors potentially impact the hypertension etiology in patients with organ transplant status.

    Donor factors

    Hypertension among organ transplant patients also develops under the impact of deceased donor renal graft[17]. Medical literature provides inclusive findings concerning the impact of donor hypertension on the hypertension predisposition of organ transplant patients; however, it independently increases the risk for renal allograft failure[18]. The donor's age often determines the post-transplant hypertension risk of the organ transplant candidates[19]. The kidney transplant patients whose donors exhibit a history of familial hypertension experience ten times greater risk of blood pressure elevation than the patients whose donors do not report a family history of hypertension[12]. The differences between the donors' age and body surface area and their organ recipients also predispose them to episodic hypertension. The nephron underdosing due to reduced recipient/donor body weight ratio potentially triggers chronic inflammation among organ transplant patients, which eventually predisposes them to diabetes mellitus, post-transplant hypertension, and chronic rejection of transplanted organs[20].

    Recipient factors

    The clinical studies provide inconclusive evidence concerning the impact of behavioral patterns of organ transplant patients on their hypertension predisposition. However, alcohol consumption, smoking, salt intake, and obesity deteriorate the clinical outcomes of organ transplant patients and increase their risk of hypertension compared to the general population. The organ transplant candidates with pretransplant hypertension and obesity experience a high risk of posttransplant hypertension[17-22]. Stable kidney transplant patients with hypovolemia experience a high risk of elevated mean arterial/ diastolic/systolic blood pressures[23]. Post-transplant hypertension also develops under the impact of comorbidities (including endocrine tumors and obstructive sleep apnea) and the age of the recipients.

    Transplant renal artery stenosis

    The development of transplant renal artery stenosis (TRAS) under the impact of renal artery stenosis reduces the vascular supply to the allograft. TRAS triggers hypertension among 1%-5% of renal transplant recipients[24,25]. The initial six months to two years after organ transplant predispose the treated patients to TRAS-related complications[26]. TRAS manifests with transplant dysfunction, water/salt retention, renal function deterioration, and refractory hypertension. The organ transplant patients eventually experience acute pulmonary edema and hypertensive crisis[26]. TRAS-induced hypoperfusion triggers renin-angiotensin-aldosterone system (RAAS) that potentiates renovascular hypertension in patients with organ transplant status[26]. The potential causes of transplant renal artery stenosis include immune-mediated endothelial deterioration, recipient/donor artery trauma, suturing techniques, donor artery atheroma, and renal artery lesions[27]. TRAS assessment relies on conventional angiography; however, TRAS correction and enhancement of blood pressure/renal perfusion warrants renal vascularizationviaPCTA (percutaneous transluminal coronary angioplasty)[26].

    Acute rejection and chronic allograft injury

    Hypertensive crisis in organ transplant patients correlates with acute and chronic allograft injury. However, clinical studies provide inconclusive evidence concerning a causal relationship between hypertension and allograft deterioration[22].

    Acute rejection

    The cases of acute organ rejection warrant diagnostic assessment concerning post-transplant hypertension. The therapeutic management of acute organ rejection often corrects the systolic and diastolic blood pressure elevations in organ transplant patients. These outcomes substantiate the acute organ rejection attribution of hypertension in organ transplant scenarios[22].

    Chronic graft injury

    The chronic renal allograft injury emanates from recurrent glomerular disease, thrombotic microangiography, tubular atrophy, interstitial fibrosis, and chronic antibody-mediated organ rejection. The focal segmental glomerulosclerosis predominantly associates with hypertension in patients with organ transplant status. The current body of evidence provides inconclusive evidence concerning the causeand-effect relationship between renal allograft dysfunction and hypertensive crisis among organ transplant patients. However, the findings from a preclinical study advocate the potential of hypertension to cause allograft deterioration in organ transplant scenarios[28].

    Immunosuppressive drugs

    The toxic effects of immunosuppressive drugs often elevate the risk of hypertension among organ transplant patients.

    Steroids

    The organ rejection prevention protocol concerning transplantation scenarios relies on the systematic administration of methylprednisolone and prednisone. Corticosteroid maintenance therapy potentially triggers a range of morbidities and comorbidities among patients with organ transplant status. It also increases their risk of hypertension to multiple folds. A plausible mechanism concerning steroidinduced hypertension attributes to volume expansion/sodium retention due to mineralocorticoid receptor overstimulation in organ transplant patients. The exclusion of steroids from the immunosuppressive therapy to mitigate the risk of hypertension could, however, trigger organ rejection and its fatal complications. A recently reported meta-analysis confirmed a 48% incidence of acute organ rejection in patients who did not receive steroids with their immunosuppressive therapies compared to 30% organ rejection incidence among patients who received steroid-controlled immunosuppressive treatments[29].

    Calcineurin inhibitors

    The multifactorial characteristics of calcineurin inhibitor-induced hypertension are widely debated in the medical literature. The calcineurin inhibitors impact the function of the sodium-potassium pump/sympathetic nervous system and vascular tone that eventually triggers a hypertensive crisis in patients with organ transplants. They further induce nitric oxide metabolism by triggering nicotinamide adenine dinucleotide phosphate oxidase-induced angiotensin-II release in the context of intrarenal renin-angiotensin system activation[30]. Furthermore, renal/systemic vasoconstriction often develops under the impact of cyclosporine therapy[31]. The endothelial receptor type A across preglomerular arteries triggers endothelin production that eventually leads to renal vasoconstriction in organ transplant recipients[29,32]. The clinical studies demonstrated cardioprotective effects of tacrolimus compared to cyclosporin in the setting of organ transplantation[33]. They also reveal the superiority of tacrolimus over cyclosporin in controlling blood pressure elevations among organ transplant patients[21]. Research evidence confirms blood pressure elevation in organ transplant recipients on cyclosporin treatment after increasing their dietary sodium intake. This increase in blood pressure indicates the incidence of sodium-dependent hypertension among patients after their organ transplantation[34]. However, the clinical studies do not provide conclusive evidence related to the sodium retaining effects of calcineurin inhibitors in organ transplant scenarios[35]. However, the medical literature indicates the potential of cyclosporin inhibitors in elevating the activity of sodium-potassium chloride/sodium chloride cotransporters for maximizing sodium reabsorption in organ transplant patients[36]. The clinical studies also emphasize the possibility of replacing calcineurin inhibitors with sirolimus based on its safety profile and least impact on the 24 h systolic blood pressures of patients with organ transplant status.

    PREVENTION MEASURES

    Organ transplant-related hypertension prevention warrants the mitigation of risk factors that potentially aggravate systolic and diastolic blood pressures in the treated patients. These risk factors include native kidneys, donor hypertension, smoking, drug use, obstructive sleep apnea, and obesity[37,38]. The findings from various clinical studies recommend lifestyle/behavioral modifications and weight reduction strategies for organ transplant recipients to minimize their risk of postprocedural hypertension. They also advocate the need for evaluating suprarenal masses based on their hypertension attribution[39].

    The long-term use of calcineurin inhibitors, including tacrolimus and cyclosporine among organ transplant patients, clinically correlates with their hypertensive crises. The clinical studies reveal a reduced impact of tacrolimus (compared to cyclosporine) on the blood pressure levels of organ transplant patients[40]. The organ transplant recipients who receive tacrolimus also exhibit a limited dependence on antihypertensive drugs for managing their blood pressure levels[37]. The clinicians accordingly recommend tacrolimus over cyclosporine for the medical management of organ transplant patients. The medical literature alternatively recommends the selective T-cell co-stimulation blocker (Belatacept) to control T cell proliferation and cytokine production in renal transplant patients for effectively managing their episodic hypertension[41].

    The clinical studies further advocate the deleterious impact of corticosteroids on the blood pressure management of organ transplant patients. They provide substantial evidence concerning the dosedependent relationship between corticosteroid utilization and hypertensive crisis in organ transplant scenarios. The clinicians accordingly recommend minimal dosages of steroids (for example, 5 mg per day dose of prednisone) to achieve long-term immunosuppression in organ transplant patients without increasing their risk for episodic hypertension[42].

    The worsening of hypertension in kidney transplant patients clinically correlates with their antibodymediated and acute cellular organ rejection[43]. The subsequent administration of immunosuppressive therapy (based on thyroglobulin, immunoglobulins, and steroids for reversing organ rejection) further exacerbates the hypertensive crisis[44]. These findings necessitate the development of comprehensive treatment protocols to minimize hypertensive crisis without compromising the outcomes of immunosuppressive therapies in organ transplantation scenarios.

    The clinical studies reveal the impact of expanded criteria donor recipient status on worsening cardiovascular complications and hypertensive crises in patients with organ transplant status[45]. Organ transplant patients prevalently develop diabetes, chronic rejection, and hypertension under the impact of reduced donor/recipient body weight ratio[20]. Posttransplant hypertension also triggers under the impact of aortorenal donor atheroma in various clinical scenarios[19]. The medical literature accordingly recommends selecting young and normal-weight donors without a confirmed diagnosis of hypertension or atherosclerosis to minimize the risk of hypertension among organ transplant patients.

    A range of genetic factors contributes to the development of hypertensive crises in organ transplant patients. The presence of apolipoprotein L-1 variants in deceased African American donors potentiates early graft dysfunction and eventual blood pressure elevation in the recipients of transplanted organs. The polymorphisms in CYP3A5, ABCC2, and ABC1 transporters further attribute to posttransplant hypertension and poor graft survival in organ transplant scenarios[46,47]. The assessment of these genetic mechanisms and factors is paramount to minimizing the risk of posttransplant hypertension among organ transplant patients.

    Post-transplant hypertension also develops under the impact of transplanted renal artery stenosis following kidney transplantation[48]. The clinical studies reveal substantial improvements in blood pressure levels of organ transplant patients after the medical management of their renal artery stenosis[49]. These findings substantiate early diagnosis and therapeutic management of renal artery stenosis to reduce the incidence of posttransplant hypertension and its critical complications.

    The therapeutic management of posttransplant hypertension relies on the systematic administration of calcium channel blockers, beta-blockers, and loop diuretics (for volume optimization). The normalization of serum potassium levels and enhancement of kidney function of organ transplant patients further depends on angiotensin receptor blockers and angiotensin-converting enzyme inhibitors[38].

    The hypertension risk factors among liver transplant recipients include new-onset hepatic steatosis, alcoholic cirrhosis, and rapamycin use[50]. These findings advocate the need for monitoring organ transplant patients on mTOR inhibitor therapies to reduce their incidence of hypertensive crises.

    The patients with allogenic hematopoietic stem cell/bone marrow transplant experience a high risk of hypertension based on several factors including graftvshost disease, mycophenolate/calcineurin inhibitor therapies, and lymphoma/Leukemia history[51]. Other hypertension predisposing factors concerning stem cell transplant scenarios include serum creatinine elevation, sinusoidal obstruction syndrome, amphotericin-B therapy, and the young age of the patients in pediatric hematopoietic stem cell transplant[15]. The clinical studies accordingly advocate consistent monitoring of the bone marrow transplant patients based on their dependence on amphotericin-B, mycophenolate, and calcineurin inhibitors.

    DIAGNOSTIC PARAMETERS

    The diagnostic assessment of hypertension in organ transplant scenarios relies on 24 h ambulatory/ home/office blood pressure monitoring interventions. The office blood pressure assessment warrants the recording of three consecutive blood pressure readings and calculation of their mean value. The home blood pressure monitoring requires averaging two blood pressure readings obtained at home within a tenure of 4 days. The 24 h ambulatory blood pressure assessment relies on averaging various blood pressure readings obtained within a day's durationviaa digital blood pressure monitor[1]. The 24 h blood pressure evaluation also helps categorize systolic/diastolic blood pressure levels based on their reverse dipping, dipping, and non-dipping patterns.

    The clinical studies emphasize marked differences between clinical blood pressure monitoring, home blood pressure assessment, and ambulatory blood pressure monitoring. These studies also advocate the requirement of practicing care and caution while measuring the blood pressure levels of organ transplant patients. The clinical findings prioritize the use of ambulatory blood pressure monitoring for investigating the occurrence of whitecoat/masked/nocturnal hypertension to rule out the risk of cardiovascular complications[52].

    The medical literature reveals a substantial increase in night-time systolic blood pressure following kidney transplantation[53]. The 24 h ambulatory blood pressure monitoring effectively tracks nocturnal blood pressure variations in organ transplant patients[54]. This blood pressure evaluation approach is the method of choice for tracking posttransplant hypertension and is recommended over home/office blood pressure monitoring interventions[55].

    The diagnostic affirmation of posttransplant hypertension thoroughly relies on the appropriate use of blood pressure recording interventions. The blood pressure monitored at the physician's office may not give an accurate outcome based on the risk of masked/whitecoat hypertension and circadian variation/diurnal rhythm. Masked hypertension could increase the risk of native kidney disease among renal transplant patients[56]. However, clinical studies do not provide conclusive findings determining the impact of masked hypertension on the outcomes of renal transplant patients. These diagnostic intricacies warrant the use of automated electronic devices for blood pressure monitoring to minimize the risk of masked hypertension and the whitecoat effect in organ transplant scenarios[57].

    The medical literature advocates optimizing blood pressure cutoff limits to accurately identify the existence or absence of hypertension and initiate antihypertensive therapies for organ transplant patients. The diagnostic parameters for assessing hypertension in posttransplant scenarios rely on the following parameters[4]: Office blood pressure reading of greater than 140/90 mmHg.

    An ambulatory blood pressure reading of greater than 135/85 mmHg (awake state) and 120/70 mmHg (sleeping state) The recommendations by KDIGO (Kidney Disease Improving Global Outcomes) advocate the need to administer antihypertensive therapies to kidney transplant patients following their blood pressure elevation above 130/80 mmHg[58].

    MAJOR COMPLICATIONS

    Approximately 50%-80% of adult organ transplant recipients develop hypertension and its clinical complications. The past medical history of hypertension further increases the incidence of posttransplant hypertension. Additionally, the old age of donors, elevated body mass index, male gender, and African American race include the significant demographic factors attributing to the development of hypertension among organ transplant patients[43].

    Types of complications

    Medical literature reports a 50% prevalence of hypertensive among patients with organ transplant status[43]. Posttransplant hypertension predominantly triggers graft dysfunction and cardiovascular events in organ transplant patients that eventually lead to their renal failure. The cardiovascular complications related to posttransplant hypertension include coronary artery disease and congestive heart failure. Uncontrolled hypertension in the setting of kidney transplants potentially disrupts cardiorenal outcomes by impacting the overall functions of the heart and renal allograft[21,59].

    Cardiovascular complications due to post-transplant hypertension

    The recipients of kidney transplants experience a 3%-5% incidence of non-fatal/fatal cardiovascular episodes. They further experience a 50-fold predisposition to cardiorenal complications compared to the general population[60]. Posttransplant mortality often attributes to critical cardiovascular complications emanating from hypertensive crises. The cardiovascular compromise develops under the impact of posttransplant hypertension and elevates the incidence of morbidity/mortality among the treated patients. The cardiovascular episodes attribute to forty percent of patient deaths in the setting of a kidney transplant[4]. The predominant cardiovascular complications emanating from posttransplant hypertension include stroke, arterial narrowing, coronary artery disease, congestive heart failure, and ischemic heart disease. The kidney transplant scenarios also report a high incidence of diastolic dysfunction, left atrial enlargement and left ventricular hypertrophy. Heart failure with decreased left ventricular ejection fraction potentially increases the mortality risk among organ transplant patients. The clinical studies reveal a strong association between nocturnal hypertension and left ventricular hypertrophy in various organ transplant scenarios[4].

    Graft dysfunction due to post-transplant hypertension

    The graft dysfunction in posttransplant scenarios predominantly develops under the impact of hypertensive crisis. The deterioration in renal function also correlates with blood pressure elevation in the setting of organ transplants. The renal allograft injury triggered by posttransplant hypertensioninduced kidney failure further aggravates episodic hypertension and its potential manifestations[43]. The clinical studies continue to examine the relationship between independent allograft survival and blood pressure levels of organ transplant patients.

    The retrospective study by Opelzet al[61] (1998) based on 29571 renal transplant recipients revealed the adverse impact of posttransplant hypertension on the renal allograft injury patterns[61]. Another clinical study indicated improvements in cardiovascular mortality and renal allograft function after therapeutic management of systolic blood pressure of patients within 1-3 years of their kidney transplantation[22]. The study outlined positive clinical outcomes in organ transplant recipients with a marked reduction in systolic blood pressure (below 140 mmHg).

    A clinical study revealed improvements in renal transplant survival rates among patients with reduced diastolic pressures (ranging between 89-99 mmHg). The study findings advocated the need for monitoring mean arterial/diastolic/systolic blood pressures of the renal transplant patients until one year after transplantation to enhance their allograft survival. The study outcomes further correlated the risk of allograft failure for every 10 mmHg diastolic/systolic blood pressure elevation[61]. The clinical studies also indicate blood pressure reduction is a protective factor for kidney transplant recipients during the initial year of their recovery[4,22]. The evidence-based findings clinically correlate graft failure/chronic allograft nephropathy, renal failure, and cardiovascular compromise with posttransplant hypertension. Organ transplant patients with hypertension accordingly experience a high risk of morbidity and mortality[61].

    MEDICAL MANAGEMENT

    The treatment guidelines for managing posttransplant hypertension do not differ from the therapeutic protocols adopted for treating hypertension/blood pressure elevation among patients with a high risk for cardiovascular complications (Table 12-3). The clinical studies reveal the impact of diabetes/proteinuria and cardiovascular conditions on the blood pressure elevation in organ transplant patients. The maintenance of systolic/diastolic blood pressure below 140/90 mmHg is highly necessary to reduce the risk of posttransplant hypertensive crisis. The multifactorial origin of posttransplant arterial hypertension in renal transplant cases warrants its systematic monitoring and medical management. Posttransplant hypertension/hypertensive crisis further intensifies under the impact of allograft nephropathy and immunosuppressive therapies. The diagnostic interventions to track and evaluate the causative factors of posttransplant hypertension include assessing 24 h urinary sodium, proteinuria, 24 h urine clearance, renal function tests, and hepatic panel. The candidates for kidney transplantation qualify for renal ultrasound in the context of evaluating their urinary tract blockage and renal artery stenosis.

    Table 1 Management for hypertension following renal transplantation

    Table 2 Target Blood pressure guideline for kidney transplant recipients

    Table 3 Studies regarding the management of posttransplant hypertension

    The pretransplant hypertension of kidney transplant recipients warrant antihypertensive therapy. The clinical studies reveal rare cases (concerning kidney transplantation) that achieve normotensive status in the absence of antihypertensive therapy. These outcomes necessitate pharmacological management of hypertension of kidney transplant patients to reduce the risk of their cardiovascular complications[22]. The non-pharmacological approaches for hypertension management in kidney transplant scenarios rely on lifestyle modification, stress reduction, weight management, smoking cessation, low-salt diet, and exercise management. Clinical studies need to explore the complex interplay between pharmacodynamics and pharmacokinetics of antihypertensive medications to optimize their use in organ transplant scenarios. They also need to investigate drug-drug interactions and their impact on comorbidities and hypertension management of organ transplant patients[62].

    The renal transplant scenarios report a high incidence of hypertension emanating from corticosteroid therapy. The novel organ transplantation protocols advocate the exclusion of corticosteroid treatment to minimize the risk of hypertensive crises or episodic hypertension[22]. However, the clinical studies provide inconclusive evidence concerning the discontinuation timings of steroid therapies for renal transplant patients. The researchers continue to debate regarding the early or late withdrawal of steroid treatments in organ transplant scenarios. Few clinical studies alternatively negate the contention related to the impact of steroid therapies on the hypertensive crisis of organ transplant patients[37].

    The medical literature provides some evidence concerning the need for manipulating the currently deployed immunosuppressive therapies to optimize the hypertension management of patients with organ transplant status. This belief reciprocates with the adverse impact of immunosuppressive treatments on posttransplant hypertension. Clinical studies showed that cyclosporine increases the risk of posttransplant hypertension compared to tacrolimus[63]. Furthermore, clinical studies also confirm a marked reduction in systolic/diastolic blood pressures following the dose reduction of cyclosporine or its replacement with tacrolimus in organ transplant scenarios[41]. These findings warrant investigation concerning the hypertension induction effect of cyclosporine in organ transplant patients. The impact of cyclosporine on renal sodium retention probably triggers vasoconstriction of glomerular arterioles leading to posttransplant hypertension[43].

    Posttransplant hypertension management primarily relies on first-line therapies based on dihydropyridine calcium channel blockers since they effectively minimize calcineurin-induced vasoconstriction. The beta-blocker therapies further improve the survival rate of organ transplant recipients irrespective of their predisposition to cardiovascular complications[64]. The antihypertensive therapies in organ transplant scenarios must exclude ACE (angiotensin-converting enzyme) inhibitors during the initial 3-6 mo based on the risk of hyperkalemia, anemia, and reduction in glomerular filtration rate[2].

    The medical literature provides evidence concerning the development of posttransplant hypertension despite administering antihypertensive therapies. The evidence-based findings elaborate on the necessity for renal arteriography to rule out renal artery stenosis in organ transplant patients. The patients who develop more than 80% renal arterial stenosis qualify for percutaneous transluminal angioplasty. Renal denervation is another viable therapy with the potential to manage refractory hypertension in organ transplant scenarios[4].

    CONCLUSION

    Posttransplant hypertension increases the risk of graft-related complications in patients with a known history of (pretransplant) hypertension. Steroids, cyclosporine, calcineurin inhibitors, and other immunosuppressive drugs further increase the predisposition of organ transplant patients to hypertension. Hemopoietic cell transplantation predominantly adds to the 2-year risk of systemic hypertension in children and adults. The donor factors for episodic hypertension attributes to the donors' age and body surface area. The recipient factors, however, include hypovolemia and preexisting comorbidities. TRAS-induced hypoperfusion triggers RAAS that potentiates renovascular hypertension in organ transplant patients. Posttransplant hypertension is a significant cause of cardiovascular complications and graft dysfunction. The 24 h blood pressure monitoring is, therefore, necessary to effectively manage hypertensive crises in organ transplant recipients. The evaluation also helps categorize systolic/diastolic blood pressure levels based on their reverse dipping, dipping, and non-dipping patterns.

    FOOTNOTES

    Author contributions:All authors contributed equally in writing, editing, and reviewing the manuscript of the article.

    Conflict-of-interest statement:The authors declare that there is no conflict of interest.

    Open-Access:This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BYNC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is noncommercial. See: https://creativecommons.org/Licenses/by-nc/4.0/

    Country/Territory of origin:United States

    ORCID number:Mahmoud Nassar 0000-0002-5401-9562; Nso Nso 0000-0002-0340-169X; Sofia Lakhdar 0000-0001-5320-2990; Ravali Kondaveeti 0000-0003-2335-5296; Chandan Buttar 0000-0003-4777-5439; Harangad Bhangoo 0000-0001-8893-3005; Mahmoud Awad 0000-0002-9243-3449; Naveen Siddique Sheikh 0000-0002-8549-2029; Karim M Soliman 0000-0002-0960-2644; Most Sirajum Munira 0000-0002-4691-1550; Farshid Radparvar 0000-0001-9631-9208; Vincent Rizzo 0000-0002-5530-447X; Ahmed Daoud 0000-0001-6311-3887.

    S-Editor:Wu YXJ

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    P-Editor:Wu YXJ

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