What the Intensivist Needs to Know About Hematopoietic Stem Cell Transplantation?
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Hematopoietic stem cell transplantation (HSCT) is a potential curative therapy for some patients with hematologic conditions. There are two main types of HSCT. This includes autologous HSCT, for which the stem cells are obtained from the patient, and allogeneic HSCT, for which the stem cells are obtained from a related or unrelated donor. The most common indications for autologous stem cell transplant are multiple myeloma and relapsed/refractory lymphoma, whereas leukemia and bone marrow failure syndromes remain the most common indications for allogeneic stem cell transplant. This chapter will review the different types, indications, processes, and main complications of HSCT. This chapter will also discuss end-of-life issues that patients and providers face when transplant patients are admitted for the intensive care unit.
KeywordsStem cell transplant Bone marrow transplant Transplant Autologous Allogeneic Graft-versus-host disease (GVHD) Veno-occlusive disease (VOD) Sinusoidal obstruction syndrome (SOS) Idiopathic pulmonary syndrome
Hematopoietic stem cell transplantation (HSCT) remains one of the only potentially curative therapies for some patients with both benign and malignant blood disorders. The concept of HSCT was first recognized in the 1950s in animal models as a means of marrow recovery following lethal doses of total body irradiation . This concept was then reported by Thomas et al. in 1957 in human patients with leukemia [43, 72, 73, 74]. Today, HSCT has broad indications which have expanded to include both benign and malignant conditions.
Types of Transplant
Diseases commonly treated with autologous HSCT 
Light chain amyloidosis
Acute myeloid leukemia
Germ cell tumors
Autoimmune disorders (i.e., scleroderma)
Diseases commonly treated with allogeneic HSCT 
Acute myeloid leukemia
Acute lymphoblastic leukemia
Chronic myeloid leukemia
Chronic lymphocytic leukemia
Paroxysmal nocturnal hemoglobinuria
Sickle cell anemia
Severe combined immunodeficiency
Inborn errors of metabolism (i.e., Gaucher’s disease)
Allogeneic HSCT is one of the first examples of immunotherapy in oncology because of its ability to use the donors immune system as a means of fighting cancer. In addition to changing the hematopoietic progenitor cells, a change in recipient’s with donor’s immune system occurs. Cellular therapy builds on the foundation of collection and infusion of hematopoietic cells used for anti-cancer therapy. The therapeutic immunologic effect of the graft was first described in the field of allogeneic stem cell transplant in the 1950s as a graft-versus-leukemia effect (GVL). The GVL effect is identified following observations of a decrease in relapse rate in leukemia patients who developed graft-versus-host disease (GVHD) after allogeneic stem cell transplant and further supported by the increased relapse rate seen after syngeneic transplants and transplants using T-cell-depleted grafts . The GVL effect, caused mostly by donor lymphocytes, prompted to the use of donor lymphocyte infusions as one of the earlier forms of cellular therapy subsequently modified genetically to be antigen specific [i.e., chimeric antigen receptor (CAR)-modified T-cells], to target different types of leukemias, lymphoma, and other malignances.
Overview of the Transplant Process
Regardless of the type of transplant, patients receiving HSCT undergo a similar process that is centered around the day of stem cell infusion, which is known as “Day 0.” The days prior to transplant are designated with a minus sign. Thus, Day −10 would represent 10 days prior to the planned infusion of the stem cells. The days after infusion of the stem cells are designated with a plus sign such that Day +30 would indicate that the patient is 30 days post infusion of stem cells. The transplant process starts with a referral or consultation by the stem cell transplant team, which initiates the process for insurance/financial clearance, assessment of comorbidities/organ function, and evaluation of the functional status of the patient and decision on what type of transplant is indicated. This process typically takes 2–3 months and will occur concomitantly with the primary or salvage therapy for management of the disease. Once the patient is both clinically suitable and financially approved, arrangements are made to collect the stem cells either via apheresis in the case of both autologous and allogeneic HSCT or bone marrow harvest in select cases of allogeneic stem cell transplantation.
The actual transplant process begins with the patient receiving conditioning chemotherapy, which is known also as the preparative regimen. In general, the pretransplant conditioning regimens consist of a combination of chemotherapy drugs with or without radiation with the goal to immunosuppress the recipient and eliminate as much tumor as possible. These regimens are classified as myeloablative, non-myeloablative, or reduced intensity. Myeloablative regimens are defined by their ability to eradicate the recipient’s bone marrow with associated profound cytopenia and lack of autologous hematopoietic recovery. Non-myeloablative (NMA) regimens typically cause minimal cytopenia and relying primarily on a GVL effect for disease eradication. Reduced-intensity protocols are an intermediate intensity group of regimens, a middle of the road between ablative and NMA conditioning . The preferred preparative regimen is dependent upon a combination of disease- and patient-related factors. The conditioning regimen is typically administered between Day −10 and Day −2 with a day of “rest” prior to the stem cell infusion to allow for clearance of the cytotoxic chemotherapy, thereby avoiding potential damage to the infused stem cells. On “Day 0,” the stem cells are infused into the patient via a central venous catheter.
Complications After Autologous HSCT
With appropriate patient selection, autologous HSCT is generally considered a well-tolerated procedure with an estimated transplant-related mortality (TRM) of less than 3% within the first 100 days posttransplant . In fact, the most common cause of death after autologous HSCT remains disease relapse accounting for up to 69% of such deaths .
The use of myeloablative chemotherapy for autologous HSCT results in profound pancytopenia, which puts the patient at risk for bacterial, fungal, and viral infections. Patients tend to be at greatest risk for bacterial infections in the early posttransplant period (prior to neutrophil engraftment), although other infections like viral or fungal can also occur during this time period. The estimated rate of admission to the ICU after autologous HSCT remains low with one study of 1013 patients showing a rate of only 3.3% . The overall mortality of all patients in the cohort was 1%. However, this increased to 38% for those patients admitted to the ICU . The most common reasons for ICU admission were systemic inflammatory response/sepsis (32%), respiratory failure (29%), and cardiovascular failure (26%) . The majority of patients had an underlying diagnosis of multiple myeloma or AL amyloidosis (85%) with the greatest disease-specific ICU mortality associated with AL amyloidosis patients (54.5%) . The study also found a correlation between mortality and both the Sequential Organ Failure Assessment (SOFA) score and Acute Physiology and Chronic Health Evaluation (APACHE II) score in the first 24 h of ICU admission suggesting possible tools to assist in clinical decision-making regarding the continuation of intensive care delivered after 24 h of ICU admission .
In addition to infectious complications, many of the patients undergoing autologous HSCT will develop gastrointestinal complications from the preparative chemotherapy regimen. The two most common preparative regimens for autologous HSCT are single-agent melphalan (primarily used for plasma cell disorders) and the combination of BCNU/carmustine, etoposide, Ara-C/cytarabine, and melphalan (BEAM) (primarily used for lymphomas). These regimens are considered myeloablative and may result in varying degrees of damage to the GI tract mucosa with mucositis, nausea/vomiting, diarrhea, altered taste, and a period of anorexia. Neutropenia lasts for 1–2 weeks and may be associated with neutropenic fever and bacteremia, requiring broad antimicrobial coverage, occasional sepsis, and need for ICU care. In addition, older patients may be more prone to cardiac toxicity and development of atrial fibrillation, especially if there is a history of atrial fibrillation, and renal insufficiency or volume overload. However, most of these effects tend to resolve within a short period of time after neutrophil engraftment has occurred.
Late effects of autologous HSCT are relatively uncommon with second primary malignancies, obstructive/restrictive lung impairment, and viral infections being the most reported late complications. A study of 1617 lymphoma survivors found a cumulative incidence of secondary neoplasms of 6.5% . The most common type of neoplasm was a hematologic malignancy (43.8%), which included myelodysplastic syndrome (MDS), myeloproliferative disorder (MPN), and acute myelogenous leukemia (AML) . A study of lymphoma patients in Japan reported an incidence of MDS and AML of 1.8% for long-term survivors after autologous HSCT. However, there was increased concern for patients with multiple myeloma who were found in trials of maintenance therapy after autologous HSCT to have an incidence of secondary malignancies of 8–14% when receiving maintenance versus 4–5% without maintenance therapy [3, 31, 44].
While pulmonary complications of autologous HSCT seem to be rare, Stenehjem et al. have reported an incidence of 11.5% and 5.8% for obstructive and restrictive lung impairment, respectively, in 226 lymphoma survivors after autologous HSCT . Current smoking and cumulative doxorubicin dose of 400–775 mg/m2 were risk factors for obstructive disease, while chest radiation greater than 13–66 Gy seemed to increase the risk for restrictive lung disease and pulmonary complications .
Lastly, patients receiving an autologous HSCT remain at risk for viral and atypical infections (i.e., varicella-zoster virus and Pneumocystis jirovecii) for several months post-engraftment while awaiting recovery of the lymphocyte population, which usually reaches a safer level by 100 days posttransplant [51, 75]. It is for this reason that many patients will remain on prophylactic medications like acyclovir or valacyclovir, Bactrim, Mepron, or pentamidine for 3–6 months after transplant. Patients are also recommended to undergo repeat vaccination for measles, mumps, rubella, tetanus, diphtheria, Haemophilus influenzae, polio, and influenza, which typically begins at 6 months after the transplant .
Complications of Allogeneic HSCT
Complications of allogeneic HSCT are generally secondary to chemotherapy side effects, prolonged immunosuppression, or immune-related effects of the donor cells. Unlike with autologous HSCT, there is also a higher risk for graft failure/rejection and higher non-relapse mortality (NRM). Overall NRM after allogeneic HSCT has improved significantly over time due to better HLA typing, improvements in patient selection, and supportive care [27, 28, 32].
The use of antimicrobial prophylaxis, growth factors, preemptive antiviral therapy, and peripheral blood stem cells have contributed to better transplant outcomes. Furthermore, the use of predictive tools in the upfront selection process seems to be beneficial with many US centers incorporating a standardized HSCT Comorbidity Index (HCT-CI) to help in the selection of patients for transplant. The HCT-CI utilizes weighted scores for the presence of a variety of comorbidities to help predict non-relapse mortality. The comorbidities include active gastrointestinal disease, coagulopathy, endocrine disease, hypertension, arrhythmia, inflammatory bowel disease, diabetes, cerebrovascular disease, rheumatologic disease, peptic ulcer, asthma, obesity, infection, psychiatric disturbances, heart valve disease, and prior solid tumor. The HCT-CI yields a calculated score between 0 and 26 allowing for patients to be classified into one of three groups: low risk (score of 0), intermediate risk (score of 1–2), or high risk (score of 3 or higher). Patients with low, intermediate, and high risk have an estimated 2-year non-relapse mortality of 14%, 19–22%, and approximately 40%, respectively . HCT-CI has also been shown to be a valid tool in predicting outcomes for patients receiving allogeneic HSCT who subsequently require critical care. In a single institution review of 377 patients admitted to the intensive care unit (ICU) within 100 days of allogeneic HSCT, Bayraktar et al.  showed that patients with HCT-CI values ≥2 had significantly higher inpatient mortality than patients with values of 0–1 and that HCT-CI values ≥4 were significantly associated with shorter OS compared with values of 0–1 (hazard ratio, 1.74; 95% CI, 1.23–2.47). Factors associated with lower inpatient mortality were ICU admission during the conditioning phase of the transplant and use of a reduced intensity conditioning regimen. The overall inpatient mortality rate was 64%, and the 1-year OS rate was 15%. Among patients with HCT-CI scores of 0–1, 2, 3, and 4, the 1-year OS rates were 22%, 17%, 18%, and 9%, respectively.
Complications of allogeneic HSCT are generally categorized as early and late effects. Early effects include primarily issues that occur within the first 100 days of the transplant. This can be further divided into three time periods: pre-engraftment, early post-engraftment, and late post-engraftment (>100 days post-HSCT).
During the pre-engraftment period, most patients will start to experience side effects of the conditioning chemotherapy regimen. This includes primarily nausea, vomiting, mucositis, and diarrhea. Fever and infection are also common during this time with gram-positive bacteria, gram-negative bacteria, herpes simplex virus, respiratory viruses, enteric viruses, and fungal infections (especially Candida and Aspergillus species) being most prevalent.
Early Post-engraftment Complications
The early post-engraftment period is defined as the time of engraftment through Day +100. During this time, the risk for bacterial infections tends to gradually decline. However, patients tend to develop an increased risk for viral infections, immune-mediated effects of the donor cells, and noninfectious pulmonary, gastrointestinal, and liver toxicities. Patients also continue to have significant anemia and thrombocytopenia in the early post-engraftment period, which tends to persist for roughly 30–60 days posttransplant.
Summary of viral infections in allogeneic HSCT recipients
Herpes simplex virus (HSV)
Mucosal ulcerations from reactivation
Epstein-Barr virus (EBV)
Posttransplant lymphoproliferative disorder (PTLD)
Human herpesvirus (HHV-6, HHV-7, HHV-8)
Common respiratory viruses
Respiratory syncytial virus (RSV)
Parainfluenza viruses (most commonly parainfluenza virus 3)
Rhinovirus and enterovirus
Early noninfectious complications after allogeneic HSCT include fluid overload, acute GVHD, liver complications, pulmonary complications – idiopathic pneumonia syndrome and diffuse alveolar hemorrhage – and hemorrhagic cystitis.
Fluid overload is a common complication of allogeneic HSCT. In a retrospective, single institution study of 594 patients undergoing allogeneic HSCT, Rondon et al.  identified a syndrome of “fluid overload” that occurred early posttransplant in the absence of other known transplant complications. This was characterized by the degree of weight gain and edema necessitating fluid removal with or without organ toxicity. The study proposed the following grading system for fluid overload: grade 1, weight gain <10% from baseline, asymptomatic or mild edema, possibly requiring diuretic therapy or a decrease in intravenous fluid replacement; grade 2, symptomatic fluid retention, with or without weight gain ≥10–<20% from baseline, requiring ongoing diuretic therapy; grade 3, weight gain ≥20% from baseline, not responding to diuretic therapy, with possible renal, pulmonary, or cardiac dysfunction requiring further treatment; and grade 4, progressive dysfunction of more than 1 organ system or requiring intensive care. The study included two cohorts. The first was a study cohort of 145 patients undergoing haploidentical HSCT with melphalan-fludarabine-based conditioning regimens. Fluid overload occurred in 66.2% of this cohort with multivariant analysis showing that grade ≥2 (HR, 13.1; 95% CI, 3.4–50; P <0.001) and serum creatinine level >1 mg/dL at transplantation admission (HR, 3.5; 95% CI, 1.1–11; P = 0.03) were significantly associated with Day +100 non-relapse mortality. This was validated in a cohort of 449 AML/MDS patients undergoing transplant from an HLA-matched related or unrelated donor following a busulfan-fludarabine-based conditioning regimen.
Acute GVHD remains a significant cause of early transplant-related mortality. In the acute setting, GVHD is felt to be primarily a T-cell-driven process that is initiated by tissue damage from the conditioning regimen followed by donor T-cell activation and the associated inflammatory response. Risk factors for acute GVHD include but are not limited to increased donor-recipient HLA disparity/mismatch, increased donor age, multiparity (female donors), use of peripheral blood stem cells, and myeloablative conditioning. Acute GVHD can affect multiple organs with the most common being the skin, gastrointestinal tract, and liver. The skin is the most commonly affected organ in acute GVHD. It typically consists of a maculopapular rash that may be pruritic or even painful. Gastrointestinal (GI) tract involvement is typically categorized as upper or lower and is based upon clinical symptoms that may be supported by a tissue diagnosis or biopsy. Upper GI GVHD typically presents with nausea and anorexia, whereas lower GI tract involvement typically presents as profuse watery diarrhea with abdominal cramping. Liver involvement is less common but typically presents with a cholestatic picture .
Prophylaxis against acute GVHD is aimed at decreasing the expansion and activation of donor T-cells. This can be accomplished through manipulation of the graft to deplete the T-cell population or with pharmacologic agents (e.g., methotrexate, cyclosporine, and the calcineurin inhibitors tacrolimus or sirolimus). Front-line treatment of acute GVHD involves the use of high doses of corticosteroids, which may further suppress the patient’s immune system, thereby increasing the risk for infection.
Clinical criteria for diagnosis of VOD/SOS
Modified seattle criteria 
Baltimore criteria 
Two or more of the following within 20 days of HSCT
Bilirubin >2 mg/dL plus at least two of the following
Serum total bilirubin >2 mg/dL
Hepatomegaly or right upper quadrant pain
>2% weight gain due to fluid retention
>5% weight gain from pre-HSCT baseline
Clinical spectrum idiopathic pneumonia syndrome 
Transfusion-related acute lung injury (TRALI)
Diffuse alveolar hemorrhage (DAH)
Acute respiratory distress syndrome (ARDS)
Restrictive lung disease
Bronchiolitis obliterans organizing pneumonia (BOOP)
Obstructive lung disease
Bronchiolitis obliterans syndrome
Peri-engraftment respiratory distress syndrome (PERDS)
Capillary leak syndrome
Another potential respiratory complication of transplant is the development of diffuse alveolar hemorrhage (DAH). It is a rare condition but with a high mortality rate . Diagnosis is suggested by the finding of patchy bilateral ground glass or consolidative opacities on imaging . It is confirmed by bronchoscopy with samples that show progressively hemorrhagic returns on sequential lavages in the same subsegment of the lung. Samples may also show hemosiderin-laden macrophages on cytology . Treatment is mostly supportive care with broad-spectrum antibiotics for cases that are suspected to be secondary to infection and glucocorticoid steroids for the treatment of underlying inflammation (i.e., capillaritis) or potential acute GVHD that is associated with some cases. The use of steroids in non-GVHD cases remains somewhat controversial since there is mixed data regarding their efficacy [9, 55]. There is also growing evidence for the potential use of recombinant factor VII as treatment for DAH [10, 29, 50, 53].
Hemorrhagic cystitis is a complication that can occur at two different time points in HSCT patients. During the pre-engraftment period, it most commonly associated with the preparative/conditioning regimen. Treatments given during the conditioning regimen associated with hemorrhagic cystitis include high-dose cyclophosphamide, ifosfamide, busulfan, and total body irradiation. However, hemorrhagic cystitis occurring in the post-engraftment period is primarily related to BK polyomavirus infection. This typically occurs within the first 100 days posttransplant and is most likely in alternative donor transplants (e.g., unrelated donors, haploidentical, cord blood transplants) [21, 66]. In haploidentical transplantation, the incidence of grade 2–4 hemorrhagic cystitis is approximately 25%  and can be associated with obstruction and renal insufficiency [33, 38, 48]. The use of alemtuzumab as part of the conditioning regimen has also been associated with increased risk for BK virus-associated hemorrhagic cystitis . Reactivation of BK virus has also been associated with delayed immunologic reconstitution . Treatment includes predominantly drugs or cytotoxic T-cell lymphocytes (CTLs). Cidofovir is the predominant pharmacologic agent used to treat BK virus infections with an estimated overall response rate of 79% that includes about 66% of complete responses . For those patients who fail to respond to pharmacologic therapy or have contraindications to such therapy, the use of CTLs is a potential option [6, 78]. Occasionally patients will require percutaneous nephrostomy tube placement for management of ureteral stenosis or obstruction.
Late Post-engraftment Complications
The late post-engraftment period is defined as anytime beyond Day +100. Disease progression remains the most common cause of mortality in the late post-engraftment period accounting for an estimated 47–58% of deaths over 100 days after allogeneic HSCT. However, patients may experience long-term quality of life and psychosocial issues including concerns over sexuality, fertility, financial toxicity, and integration back to society . Patients also remain at risk for infection with encapsulated organisms and varicella-zoster virus while awaiting complete immune reconstitution, which may take up to 2 years in allogeneic HSCT patients [41, 75]. Much like the early post-engraftment period, those patients requiring prolonged immunosuppression and corticosteroids during this time period remain at increased risk for a variety of viral and fungal infections requiring ongoing prophylaxis .
Another late effect of HSCT is the risk for secondary cancers. While myeloid malignancies (i.e., secondary myelodysplastic syndrome and therapy-related acute myelogenous leukemia) are most common after autologous HSCT, there is a reported incidence of solid cancers in up to 15% of patients who are recipients of autologous or allogeneic HSCT. This incidence does not seem to have a plateau and is responsible for up to 5–10% of late deaths after HSCT. Risk factors include advanced age, the use of total body irradiation, and the development of chronic GVHD. Total body irradiation seems to have a strong association with the development of adenocarcinomas, whereas chronic GVHD seems to be associated with squamous cell carcinoma of the skin. Another unique malignancy that can be seen in EBV seropositive patients after allogeneic HSCT with T-cell-depleted grafts or intensive immunosuppression is posttransplant lymphoproliferative disease (PTLD) .
Lastly, the development of chronic GVHD is a major cause of morbidity and reduced quality of life in long-term survivors of HSCT. Chronic GVHD and its treatment is a severely immunosuppressive condition which could be associated with various infectious complications related to T-cell dysfunction, like fungal or viral infections, which occasionally may need ICU care. Unlike acute GVHD, chronic GVHD tends to have a gradual onset with symptoms starting after 6 months after transplant and may evolve to organ fibrosis with involvement primarily of the skin/fascia. Classic cases of chronic GVHD tend to occur after Day 100 of transplant, but some patients can develop symptoms earlier as a progressive evolution from acute GVHD. This is known as an overlap syndrome whereby patients exhibit signs and symptoms of both acute and chronic GVHD. Approximately 70–80% of cases of chronic GVHD are preceded by acute GVHD with increased risk in patients receiving peripheral blood stem cells from unrelated donors. Treatment includes systemic therapy aimed at controlling the underlying destructive immunologic process (steroids, ruxolitinib, photopheresis) while also providing aggressive supportive care to address symptoms of pain, joint/fascia tightness, chronic dry mouth, and dry eyes. Patients also require ongoing surveillance for skin cancers. This is best accomplished in experienced transplant centers with a multidisciplinary team that includes a transplant physician, physical therapist, occupational therapist, dermatologist, and ophthalmologist as available resources .
End of Life Issues in HSCT Patients Admitted to the ICU
Stem cell transplant can be associated with complications that may require admission to the intensive care unit (ICU). The estimated rate of ICU admission is 3.3% for autologous HSCT  and approximately 16% (range of 9–30%) for allogeneic HSCT [7, 8]. The most commonly reported reasons for ICU admission are respiratory failure, sepsis, and infection. Although, ICU admission of a stem cell transplant patient, especially with an allogeneic graft, has been associated with a poor prognosis, overall, the survival of HSCT patients requiring intensive care unit (ICU) admission has improved over the years. In fact, a single institution study of patients with hematologic malignancies admitted to the ICU showed no difference in survival between those patients who received a transplant and patients who did not receive a transplant . Furthermore, a single center retrospective study of 164 allogeneic HSCT recipients admitted to the ICU showed a long-term survival rate of 61% and 51% at 1 year and 5 years, respectively. This was similar to patients who never required intensive care . van Vliet et al.  also showed that admission to the ICU had no negative impact on long-term health-related quality of life for patients being treated for a hematologic malignancy. Forty-five percent (45%) of the patients in the study were recipients of HSCT. However, one of the ongoing struggles with HSCT patients in the ICU is the ability to predict prognosis and the optimal timing for end-of-life discussions with the patients and caregivers.
Communication between the ICU and transplant teams is a key factor in avoiding conflict over the timing of admission to the ICU and goals of care. This seems to be particularly an issue for those patients who undergo allogeneic HSCT with curative intent where studies of traditional organ function indexes (i.e., APACHE II, APACHE III, and SOFA) seem to provide conflicting results for the ability to predict ICU outcomes in the HSCT population. Afessa et al.  found the APACHE III score to have a moderate discrimination and good calibration in predicting hospital mortality, while the APACHE II score had no prognostic value. Gilli et al.  concluded that the APACHE II score underestimated mortality, while the use of the SOFA score correlated with hospital mortality. Specifically, there were no patients with a SOFA score >11 who survived in this study. Two other studies also showed a correlation of higher SOFA score with increased hospital mortality [47, 77]. Other studies also suggest that the need for mechanical ventilation is associated with shorter survival [2, 52, 68]. Furthermore, the combination of liver failure and renal failure in mechanically ventilated HSCT patients seems to be universally fatal [4, 25, 60].
In addition to communication among providers, it is also imperative that the transplant team has addressed advance care planning (ACP) with the patient prior to HSCT. Ganti et al.  showed in a study of 343 patients undergoing HSCT (including both allogeneic and autologous) that ACP was associated with a decrease risk for post-HSCT mortality with an estimated 1-year probability of survival of 77% without ACP and 89% with ACP (HR for risk of death 2.11; 95% CI, 1.34–3.33; p = 0.001). This group concluded that the patients least likely to have planned for poor outcomes are the most likely to face them and engaging in ACP is not inconsistent with hoping for the best outcome in HSCT [24, 40].
In conclusion, the ICU care for the hematopoietic stem cell transplant patients is complex due to the severely immunosuppressed state of these patients in the early posttransplant period. Complications are primarily related to infections or organ failure from chemotherapy. Even though concerns remain with the need for ICU care in allogeneic hematopoietic transplant recipients, several studies have shown encouraging results, likely related to an overall lower intensity of conditioning regimens, better prevention of infectious complications, expanded availability of treatment options, and better recognition of potential complications that can occur in these patients.
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