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Management of hypertension for patients undergoing dialysis therapy
Renal Replacement Therapy volume 2, Article number: 21 (2016)
Hypertension is very prevalent among patients undergoing dialysis therapy: hemodialysis (HD) and peritoneal dialysis (PD). Although it is recognized as a great risk of cardiovascular mortality for these populations, how to regulate blood pressure (BP) is poorly understood. For HD patients, we should pay much attention to methods of measuring BP. Out-of-center BP levels and BP variability should be evaluated by ambulatory BP monitoring and home BP measurement because they are closely associated with cardiovascular mortality. Although target BP levels are not clear, several clinical guidelines suggest <140/90 mmHg. However, it must be determined for each individual patient with careful considerations about comorbidities. Based on the underling pathophysiology of hypertension in patients on dialysis, maintaining an appropriate volume of body fluid by dietary salt restriction and optimization of dry weigh should be considered as a first line therapy. Inhibitors for renin-angiotensin system may be suitable to reduce BP and mortality for those patients on dialysis. These drugs may also be effective for preserving residual renal function and peritoneal function for PD patients. β-blockers may have potentials to improve survival for HD patients and can be added to anti-hypertensive medications. Lacking large-scale and good quality clinical trials, there are many questions to be answered. Much effort should continuously be made to create evidences for better management of hypertension for patients on dialysis therapy.
Hypertension is very prevalent in patients undergoing dialysis therapy [1, 2]. As is for general population, it is one of the major causes of cardiovascular mortality for those who take dialysis . It is still challenging to treat hypertension in patients on dialysis because there are many unsolved problems and concerns for the management of hypertension, mainly due to few good quality clinical trials. In this review, these problems will be discussed according to therapy types of dialysis: hemodialysis (HD) and peritoneal dialysis (PD).
Management of hypertension for patients on HD
Concerns about blood pressure (BP) measurement
It is of note that any standard methods to measure BP have not yet been established. Most of clinical studies have used pre-HD BP for determining optimal BP levels or analyzing the effects of BP-lowering therapies . However, there is a great concern about when or how to measure BP . A major determinant of blood pressure in HD patients is body fluid volume. Therefore, individual patient’s BP varies even during an HD session as well as between sessions . This inconsistence is considered as a part of reasons why the association of BP levels and clinical outcomes has been controversial. Although conventional BP measurements during HD sessions is certainly important for the purpose of volume assessment and safety, we should consider other methods to evaluate patient’s BP such as ambulatory BP monitoring (ABPM) and home BP (HBP) measurements. These “out-of-dialysis-unit” BP measurements have shown to be superior to conventional BP measurements as they are linearly associated to the mortality of HD patients. For example, in a prospective cohort study, a 44-h ABP recording or 1-week HBP recording has more predictive power for target organ damage and mortality than conventional BP recordings . Thus, it is recommended to measure BP with multiple methods in clinical guidelines such as by Kidney Disease Outcomes Quality Initiative (K/DOQI) and Japanese Society for Dialysis Therapy (JSDT) [8, 9].
Target BP levels
It has been shown that there is a “U-shape” relationship between BP and mortality by several observational studies [10–12] and a prospective cohort study , meaning that BP below certain levels is even more harmful than high levels. This reverse epidemiology of BP and cardiovascular mortality makes it difficult to determine target BP levels when treating hypertension. However, we should be cautious to interpret the results because low BP in these observational studies does not necessarily mean the consequence of anti-hypertensive treatment. In other words, patients with severe cardiovascular comorbidities may be included in those who have low BP, contributing to the poor prognosis. A multicenter prospective cohort study has recently reported interesting results about the relationship between all-cause mortality and systolic BP (SBP) . In the study, there is a “U-shape” association to “dialysis-unit” SBP. In contrast, “out-of-dialysis-unit” SBP has a linear association to the mortality. These results suggest that optimal target BP for treatment should be determined by ABPM and HBP, although no such target has established yet.
As a target, the guidelines such as by K/DOQI and JSDT recommend BP less than 140/90 mmHg at the beginning of the week, with a caution not to apply uniformly to all patients [8, 9]. The caution includes how to reach the target BP. Aggressive approach to control BP can be a risk of symptomatic intradialytic hypotension, which is a great hazard for HD patients .
Nonpharmacological management of hypertension in HD patients
As mentioned earlier, BP in patients on HD depends on the volume of body fluid. Sodium and volume excess is the most important cause of hypertension. They are often observed when patients have low adherence to restrict dietary salt and water. High salt intake has been shown to associate with high pre-dialysis SBP and cardiovascular death . It is thus a key to maintain proper body fluid volume to manage hypertension in HD patients. For this purpose, providing a patient education to reduce dietary salt should be the first line therapy. Salt consumption stimulates osmotic thirst and water drinking, leading to expand body fluid. Conversely, as far as salt restriction is successfully achieved, water appetite is minimized. Thus, guidelines such as by Kidney Disease/Improving Global Outcomes (KDIGO) and JSDT clearly state the importance of salt restriction [9, 17]. According to these guidelines, dietary salt should be restricted to below 5–6 g/day. Increase in fluid volume can be monitored by body weight, and interdialytic weight gain should not exceed 0.8 kg/day.
Another way to regulate the volume of body fluid is to set an appropriate dry weight (DW) for individual patient. In the dry-weight reduction in hypertensive hemodialysis patients (DRIP) trial, DW reduction by 1 kg at 8 weeks resulted in systolic and diastolic BP decrease by 6.6 and 3.3 mmHg, respectively . This study clearly shows that the reduction of DW is a simple, efficacious, and well-tolerated maneuver to improve BP control. Despite the knowledge that to determine an appropriate DW is important for BP control, it is still challenging and sometimes needs “try and error.” Conventional ways to optimize DW utilize multiple parameters: physical signs of overhydration such as leg edema, cardio-thoracic ratio by chest X-ray, concentrations of serum natriuretic peptides, and so on. The problem is that these parameters are far from reliable. Recently, methods using bioimpedance analysis have been focused as reliable ways to estimate hydration status. Randomized control studies (RCTs) have demonstrated that optimization of DW by bioimpedance-guided methods are safe and capable of improving BP control [19, 20]. Thus, it is worthwhile applying these methods for DW setting.
Dialysis frequency also matters to BP regulation. The Frequent Hemodialysis Network Trial has compared the effect of a six-times-per-week dialysis regimen to the conventional three times weekly regimen . As a result, the frequent HD significantly reduces BP. Another randomized cross-over study has demonstrated that short daily HD compared to conventional HD requires fewer anti-hypertensive medications to achieve the same BP . These studies clearly show that frequent HD can improve BP control.
Hypoxemia by sleep apnea can be a cause of hypertension. In general population, obstructive sleep apnea (OSA) is the frequent underlying disease of secondary hypertension and resistant hypertension . It has been reported that patients with end-stage renal disease and with severe OSA are sevenfold more likely to have resistant hypertension than individuals in general hypertensive population . Fluid overload is considered as a mechanism contributing to the pathogenesis of OSA in patients on dialysis . Whether interventions to OSA can improve BP control and mortality is to be examined.
Treatment by anti-hypertensive drugs for HD patients
Most HD patients require anti-hypertensive drugs to control BP. Almost all patients have past history of hypertension before starting dialysis and have taken multiple anti-hypertensive medications. It has been reported by several cohort studies including JSDT registry  and meta-analyses [27, 28] that BP control by anti-hypertensive drugs leads to better cardiovascular outcomes. However, any optimal regimen to control BP and to reduce mortality has not yet been established.
Dihydropyridine calcium channel blockers (CCBs) are widely used to reduce BP for dialysis patients as well as general hypertensive population. They are effective for overhydrated state commonly observed in HD patients . A randomized study demonstrated that amlodipine significantly reduced BP for subjects undergoing HD as compared with placebo . Although there has been little evidence showing that CCBs reduce mortality, it is still considerable to add CCBs to anti-hypertensive medications.
Inhibitors of renin-angiotensin system (RAS) such as angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin receptor blockers (ARBs) have been widely used to reduce the cardiovascular mortality for chronic kidney disease (CKD) population as well as general population. As a consequence, most of patients have already been prescribed these RAS inhibitors before initiating dialysis therapy. Although no large scale RCTs have not yet been conducted, RAS inhibitors should be continued unless adverse effects are obvious. These agents are particularly beneficial for cardiac comorbidities generally seen in HD patients and have been effective for reducing left ventricular mass and mortality [31–34].
Hypertension and heart failure (HF) are the conditions frequently associated with CKD. In the pathophysiology of both conditions, sympathetic overactivity plays an important role . With an ability to seize sympathetic activity, β-blockers may be suitable for treating both hypertension and HF in CKD . A meta-analysis concluded that treatment with β-blockers improved all-cause mortality in patients with CKD and chronic HF . They seem to be beneficial for HD patients as well. A retrospective cohort study analyzing the US Renal Data System (USRDS) has shown that β-blocker use was associated with a lower risk of new HF and cardiovascular mortality . One prospective cohort study from Japan has also demonstrated that the use of β-blockers is significantly associated with reduced risk of mortality in HD patients . Among β-blockers, there are many differences in pharmacological characteristics. Very recently, Weir and colleagues have provided a potentially important viewpoint regarding the dialyzability of β-blockers. They conducted a retrospective cohort study and found that “low-dialyzability” β-blockers are associated with lower mortality as compared with “high-dialyzability” β-blockers in elder HD patients . Although not analyzed in Weir’s paper, carvedilol is one such β-blocker with “low-dialyzability.” It is the only β-blocker with evidence to reduce mortality rate in HD patients with dilated cardiomyopathy . With these results, it can be a reasonable option to administrate potent β-blockers for HD patients to control BP.
Considerations for blood pressure variability (BPV)
There have been growing evidences showing that BPV is closely associated with worse outcomes in patients with hypertension [42–44]. BPV is also a great threat to patients on HD because they are always experiencing BP change in intra- and inter-HD sessions. It has been demonstrated that visit-to-visit BPV is extremely high in HD patients than non-HD populations and is a strong predictor for cardiovascular events . Pre-dialysis systolic BPV is also associated with cardiovascular and all-cause mortality [46–48]. Not only pre-dialysis BPV but also intra- and post-dialysis BPV are related to adverse outcomes. A higher intradialytic BPV is independently associated with increased cardiovascular and all-cause mortality [49, 50]. Intradialytic BP rise is also a well-known complication of HD. Overhydration and activation of RAS and sympathetic nervous system are thought to underlie in the pathophysiology of this phenomenon . It has been shown that an intra- or post-dialysis BP rise has been an independent predictor for cardiovascular death [52, 53]. Thus, it appears that BPV is a great risk of cardiovascular mortality for patients on HD. We should pay much attention not only to absolute BP values but also to pre- and inter-HD BPV. To detect and evaluate BPV, the importance of ABPM and HBP measurements is emphasized here again.
It becomes evident that BPV and cardiovascular damage are closely associated; however, whether there is causal relationship is still unclear. Among anti-hypertensive drugs, β-blockers or an antiadrenergic drug has been shown to abolish the excess risk for death and CV events associated with a high visit-to-visit SBP variability for CKD patients, not on HD . This result suggests that BPV is indeed a cause of cardiovascular events and raises a hypothesis that these classes of drugs are effective to reduce BPV as well for patients undergoing HD. Nevertheless, clinical studies aiming to investigate whether any interventions to reduce BPV improve mortality will be needed.
Management of hypertension in patients on PD
Hypertension in PD patients is as prevalent as in HD patients . For BP evaluation, ABPM and HBP measurements are recommended because BP levels measured by these methods are closely associated with hypertensive end-organ damage such as left ventricular hypertrophy [56, 57]. A guideline published recently by International Society for Peritoneal Dialysis (ISPD) also recommends HBP measurement at least once a week . As results from observational studies, relationship between BP and mortality is complex. One study showed that a SBP below 110 mmHg was associated with a high mortality . Another study showed that a high BP was associated with a low mortality within the first year of PD initiation, then with a high mortality in the longer term . There have been no RCTs to date to determine the optimal BP levels for PD patients. In the ISPD guideline , target BP below 140/90 mmHg is recommended based on data from general and CKD populations.
Nonpharmacological management of hypertension in PD patients
Salt and water excess is the most important determinant of raising BP in patients on PD [61, 62] as well as HD patients. It has been reported that hypervolemia evaluated by a bioimpedance analysis is indeed associated with high BP . Conversely, dietary salt restriction contributes greatly to manage hypertension. A Turkish group has reported that a strict salt restriction (~4 g/day) significantly reduced BP and improved survival of the patients studied [63, 64]. Thus, as a first line strategy for BP management, dietary salt restriction is essential. ISPD guideline recommends salt restriction (<5 g/day) for all peritoneal dialysis patients unless contraindicated or patients show evidence of volume contraction or hypotension .
Considerations for residual renal function and peritoneal function
Residual renal function (RRF) has been shown to be an independent predictor for survival in dialysis patients including PD . It becomes more difficult to maintain dialysis adequacy for PD patients as RRF declines. Therefore, preserving RRF is particularly important for patients on PD. For the purpose of RRF preservation, some strategies have been reported effective . These include keeping proper body fluid volume and controlling BP. It has been widely accepted that RAS inhibition by ACEIs or ARBs is to be administrated to CKD patients because they have an ability to retard the rate of renal function loss . RRF in PD patients can also be protected by these drugs as demonstrated by randomized clinical trials [68, 69]. Recently, a review by the Cochrane library concluded that ACEIs and ARBs have additional benefits of preserving RRF in patients on PD .
For patients on PD, peritoneal function is certainly important. Deterioration of peritoneal function has been characterized by neoangiogenesis and fibrosis. Among factors involved in this process, local RAS plays an important role . All components of RAS can be produced locally in the peritoneal tissue and stimulate the signals leading to angiogenesiss and fibrosis . In retrospective cohort studies, RAS inhibition was associated with the preservation of ultrafiltration and peritoneal transport rate [73–75], suggesting that administration of ACEIs or ARBs can be a way to slow the deterioration of peritoneal function.
As discussed above, RAS inhibition is beneficial for both preserving RRF and peritoneal function. One retrospective study suggested that use of ACEIs and ARBs improved the survival of PD patients . Although high-quality evidence showing RAS inhibition for reduction of mortality does not exist , this strategy can be considered as a first line medication for hypertension in patients on PD.
Lacking large scale and good quality clinical trials, there are many questions to be answered. These include optimal methods to measure BP, target BP levels, appropriate regulations of body fluid volume, anti-hypertensive drugs to be used, and so on for patients on dialysis therapy. Currently, there is no means of treating hypertension with the best available knowledge, even if it is not perfect. But for the future, we should continue to make efforts to create better evidences about management of hypertension for those people.
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The author thanks Ms. Kumiko Shiota and Kaori Yoshida for their excellent secretarial assistance.
The author declares that he has no competing interests.
YT wrote the entire manuscript and approved it.
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Taniyama, Y. Management of hypertension for patients undergoing dialysis therapy. Ren Replace Ther 2, 21 (2016). https://doi.org/10.1186/s41100-016-0034-2
- Peritoneal dialysis
- Blood pressure measurement
- Body fluid volume
- Dry weight
- Salt restriction
- Renin-angiotensin system
- Residual renal function