Lactic acidosis is commonly observed in clinical situations such as shock and sepsis, as a result of tissue hypoperfusion and hypoxia. Lymphoma and leukemia are among other clinical situations where lactic acidosis has been reported. We present a case of a 59-year-old female with lactic acidosis who was found to have aggressive B-cell lymphoma. There have been 29 cases of lymphoma induced lactic acidosis reported thus far; however all reported cases have abnormal vital signs or concomitant medical conditions that may lead to lactic acidosis. The pathogenesis of malignancy-induced lactic acidosis is not well understood; however associated factors include increased glycolysis, increased lactate production by cancer cells, and decreased hepatic clearance of lactate. When it occurs, lactic acidosis is a poor prognostic sign in these patients. Prompt diagnosis and treatment of underlying lymphoma or leukemia remains the only way to achieve complete resolution of lactic acidosis in these patients.
1. Introduction
Lactic acidosis is a common cause of an anion gap acidosis that often carries a significant risk for mortality. Lactic acidosis most commonly results from an imbalance between oxygen delivery and oxygen demand (Type A). However, it can also occur in the absence of a recognizable impairment in systemic oxygen delivery, resulting from impaired oxidative phosphorylation (Type B). Type B lactic acidosis is associated with numerous conditions, including inborn errors of metabolism, drugs and toxins, systemic diseases (i.e., diabetes and sepsis), and less commonly, malignancy.
Lactic acidosis has been reported in cases of lymphoma and leukemia. The exact pathophysiology and the best way to manage lactic acidosis in this setting remain unclear. We present a case and review the literature relating to lactic acidosis in lymphoma.
2. Case Report
A previously healthy 59-year-old high school teacher presented with severe fatigue, generalized weakness, decreased appetite, weight loss, and increased abdominal swelling for 2 months. She reported no fever, night sweats, cough, or urinary symptoms. On physical examination, she appeared cachectic with temporal muscle wasting. Blood pressure was 113/38, heart rate was 134/min, respiratory rate was 22/min, temperature was 98.6°F, and she was not hypoxic on room air. The spleen tip was palpated at 10 cm below the left costal margin. Physical exam findings were otherwise normal.
Laboratory data revealed sodium 134 mmol/L, potassium 4.4 mmol/L, chloride 93 mmol/L, carbon dioxide <10 mmol/L, anion gap >31 , blood urea nitrogen (BUN) 25 mg/dL, creatinine 0.6 mg/dL, and glucose 87 mg/dL. Other pertinent labs included leukocyte count 6.4×109/L, hemoglobin 4.1 g/dL, platelet count 19×109/L, aspartate transaminase (AST) 103 U/L, alanine transaminase (ALT) 15 U/L, alkaline phosphatase 104 U/L, lactate dehydrogenase (LDH) 647 mmol/L (normal range 0.5–2.2 mmol/L), haptoglobin 55 mg/dL, uric acid 13.6 mg/dL, and lactate 16.5 mmol/L. Arterial blood gas revealed a pH of 7.33, a PCO2 of 21 mmHg, and PO2 of 132 mmHg, with a bicarbonate of 11.2 mmol/L. Peripheral blood smear revealed no blast cells or abnormal leukocytes. Blood cultures were negative. Computed tomography (CT) scan of the abdomen and pelvis revealed massive splenomegaly measuring 25 cm craniocaudally, and extensive lymphadenopathy in the abdomen and pelvis (Figure 1).
Computed tomography scan of the abdomen showed massive splenomegaly and extensive lymphadenopathy . (L: liver, S: spleen, N: lymphadenopathy).
The patient was aggressively hydrated and received blood transfusions to improve her anemia. However, she remained tachycardic. Throughout her hospital course, her blood pressures remained stable. No source of infection or bleeding was identified. With these measures, lactate improved to 6.7 mmol/L but shortly after that rose to 27.7 mmol/L (Figures 2 and 3).
Correlation between lactate level and vital signs.
Correlation between lactate level, pH, bicarbonate, creatinine, and hemoglobin.
While awaiting pathological diagnosis, the patient deteriorated clinically, and on day 4, intravenous corticosteroids were administered for presumed high-grade lymphoma. In addition, a sodium bicarbonate infusion and allopurinol were initiated for tumor lysis syndrome prophylaxis.
Bone marrow biopsy revealed a diffuse (>50%) infiltrate of cells positive for CD 45 and CD 20, negative for CD 5, CD 10, CD 23, and cyclin D1. GTG-banding studies reveal a very complex karyotype. However, morphologically the cells were not large enough to be called large B-cell lymphoma. The final diagnosis was CD 20-positive B-cell lymphoma. Cyclophosphamide, vincristine, and prednisone were started on day 7. On day 8, she developed respiratory distress with new bilateral pulmonary infiltrates concerning for adult respiratory distress syndrome and became hypotensive requiring vasopressor support. Given the severity of the multiple organ failure, her family decided to withdraw support, and she died on hospital day 12. Autopsy revealed extensive lymphoma as well as diffuse pulmonary, kidney, and esophageal hemorrhage.
3. Discussion
Lactate is produced from the anaerobic metabolism of pyruvate, which in turn is generated from glucose via glycolysis. Therefore, lactate production is a surrogate marker of acidosis during a hypoxic state, and not the direct cause. Lactic acidosis is infrequently encountered in malignancies; yet when present portends an extremely poor prognosis [1]. Moreover, the strikingly high mortality associated with lactic acidosis has prompted some oncologists to consider this an oncological emergency [2]. Hematologic malignancies, including acute leukemias and high-grade lymphomas, are the most common neoplastic disorders associated with lactic acidosis. Twenty nine cases of lymphoma induced lactic acidosis have been published in English language journals (Table 1). Seven patients experienced either a partial or complete remission, three of whom subsequently expired from recurrence and there is no long-term followup on an additional two patients. As patients with malignancy induced lactic acidosis are often criticallyill, it is difficult to discern whether the etiology of lactic acidosis is completely a result from the malignancy and not from other potential causes of Type A lactic acidosis (i.e., sepsis, hypotension, hypoxia, etc.). In the patient we present above, she did not have hypoxia or significant hypotension when the lactic acidosis was discovered. The lactic acidosis persisted despite volume repletion, including blood transfusions. Furthermore, we could not identify a source of infection and her lactic acidosis preceded her intensive care visit. However, she was anemic, tachycardic, and tachypneic at presentation. Therefore, it is impossible to conclude there were no additional influences that may have led to Type A lactic acidosis. Upon reviewing the current literature of lymphoma induced lactic acidosis, many cases did have concomitant sepsis, anemia, surgical procedures, or abnormal vital signs (Table 1). Accordingly, every published case that reported vital signs had at least one vital sign indicative of systemic inflammatory response. As the majority of cases to date had concomitant factors that potentially could lead to lactic acidosis, as in the case we present above, the true incidence of lymphoma induced lactic acidosis remains cloudy.
Summary of all reported cases of lactic acidosis associated with lymphoma. (NR: normal range; BP: blood pressure; RR: respiratory rate; P: pulse; T: temperature.)
Reference
Age
Type of lymphoma
Lactate (mmol/L)
Vitals
Directed treatment of lactic acidosis
Chemo
Outcome
Comments
Friedenberg et al. [3]
75
Follicular
5.4
BP NR P104
None
Yes
Died in 2 days
Friedenberg et al. [3]
54
T-cell
12
BP 120/50 P 92
None
Yes
Died in 10 weeks
Friedenberg et al. [3]
54
Diffuse large B-cell
18
BP 96/40 P118
Hemodialysis
Yes
Died in 4 days
Concomitant sepsis (presumed)
He et al. [4]
28
Natural Killer/T-cell
11.2
NR
IV Bicarbonate
Yes
Remission
Died from recurrence after undisclosed period of time
Prikis et al. [5]
65
Large B-cell
18
NR
IV bicarbonate and dialysis
Yes
Remission
Sustained low efficiency dialysis
Dogan et al. [6]
24
Large B-cell
33.0
BP 100/60 P 95 RR18 T 36.7 C
IV Bicarbonate and Hemodialysis
Yes
Died within 10 days
Glasheen and Sorensen [7]
74
Burkitt’s
15.8
NR
None
No
Died in 13 days
Ohtsubo et al. [8]
77
Mantle Cell
26.3
NR
IV Bicarbonate
Yes
Remission
DiComite et al. [9]
64
Large B-cell
9.0
NR
IV Bicarbonate
Yes
Died
Unclear time to death
Sillos et al. [1]
18
Large T-cell
15.4
NR
IV bicarbonate
Yes
Remission
Lymphoma recurred and died in 7 months
Thakur et al. [10]
82
Hodgkin’s
11.5
NR
IV bicarbonate
No
Died in 3 days
Yasin and Hartranft [11]
76
Large B-cell
13.1
NR
None
No
Died in 7 days
Presumed ascending cholangitis. Had two exploratory operations
Durig et al. [12]
71
Non-Hodgkin’s
17.4
BP 120/60 P120
IV Bicarbonate
Yes
Died in 14 days
Scheuleer-Holmes et al. [13]
54
Non-Hodgkin’s
16.4
BP 160/90 P 92 RR 26 T 37.1 C
IV Bicarbonate
Yes
Died within 3 months
Caspar and Oelz [14]
74
Non-Hodgkin’s
14.8
NR
None
No
Died in 2 days
Caspar and Oelz [14]
71
Non-Hodgkin’s
12.2
BP 165/100 P 100
IV Bicarbonate
Yes
Remission
Died in 6 months
Caspar and Oelz [14]
34
Non-Hodgkin’s
23.6
NR
IV Bicarbonate
Yes
Remission
Lactic acidosis occurred after exploratory operation
Doolittle et al. [15]
19
Diffuse Histiocytic
21.8
BP 90/60 P 120 RR 24, Temp 101 F
IV Bicarbonate
Yes
Died in 5 weeks
Blood cultures negative
Doolittle et al. [15]
60
Hodgkin’s
16.3
NR
IV Bicarbonate
Yes
Died in 24 days
Vandermolen et al. [16]
32
Non-Hodgkin’s
32
NR
None
Yes
Remission
Johnson and Whelan [17]
21
Non-Hodgkin’s
16.1
NR
IV Bicarbonate
Yes
Died in 14 days
WBC 27,700 and presumed sepsis
Leyden et al. [18]
47
Hodgkin’s
20.0
NR
IV Bicarbonate
Yes
Died within 6 days
Pneumonia
Leyden et al. [18]
61
Non-Hodgkin’s
46.8
NR
IV Bicarbonate
Yes
Died in one day
Gastrointestinal hemorrhage with hemoglobin of 4.0 g/dL
Nadiminti et al. [19]
30
Hodgkin’s
14
BP 120/80 P106
IV bicarbonate
Yes
Died in 4 weeks
Mintz et al. [20]
65
Histiocytic
21.8
BP 114/66 P 124 RR 32
IV Bicarbonate
No
Died in 4 days
Mintz et al. [20]
34
Histiocytic
14.2
BP 120/75 P100 T 39C
IV Bicarbonate
Yes
Died in 8 days
Mintz et al. [20]
60
Histiocytic
5.9
BP 100/65 P 124 RR 30
None
Yes
Died in 3 weeks
Mintz et al. [20]
58
Histiocytic
4.5
BP 90/60 P 112 RR 50 T 39C
None
Yes
Died in 2 weeks
Scheerer et al. [21]
47
Hodgkin’s
8.8
BP 112/80 P110
IV bicarbonate
Yes
Died in 11 days
The pathogenesis of lactic acidosis in lymphoma is incompletely understood and likely multifactorial. Liver metastasis and dysfunction is often cited as a potential cause because of reduced hepatic utilization of lactate via gluconeogenesis [7]. However, lactic acidosis can occur in the absence of liver dysfunction [1, 22, 23]. In fact, Sillos et al. reported 19% of patients with lactic acidosis in the setting of hematological malignancies did not have liver involvement [1]. Furthermore, lactic acidosis is uncommon in patients with cirrhosis or fulminant hepatic failure in the absence of malignancy [24]. Accordingly, although liver dysfunction may contribute to the development of lactic acidosis, it is unlikely to be the sole cause. Another potential mechanism for lactic acidosis is increased glycolytic activity, with a subsequent increase in lactate acid generation, in cancer cells. Further supporting this hypothesis, several cases have been characterized by recurrent hypoglycemia, presumably related to increased glycolysis [7, 9, 12]. Overexpression of type II hexokinase [25], a glycolytic enzyme found in mitochondria, or increased IGF-binding protein (IGFBP) activity, has been implicated in the increased glycolysis in cancer cells [1]. Finally, excessive lactate production may result from highly aggressive tumors that simply outgrow their blood supply [26]. In essence, there is production of lactate from local hypoxia in the absence of any systemic hypoxia or hypoperfusion.
Regardless of etiology, the treatment for lactic acidosis is to discern and correct the underlying mechanism producing the lactate, as well as to ensure adequate oxygen delivery in cases of hypoxia. Accordingly, in malignancy derived lactic acidosis, chemotherapy is the primary treatment modality. As demonstrated in Table 1, the only treatment modality that consistently leads to remission was initiation of chemotherapy. Of the 29 reported cases of lymphoma induced lactic acidosis, only seven went into remission, all of whom received chemotherapy. Of the seven cases who went into remission, the lactate levels normalized in 6 (one case did not report what happened to the lactate levels after chemotherapy). In five of the six cases, resolution of the lactic acidosis occurred as early as 15 hours and up to 3 days after starting chemotherapy. In the remaining case, the lactate level normalized weeks after chemotherapy was introduced; however, did so within 2 days of starting salvage chemotherapy. Thus, it is probably safe to conclude that if lactic acidosis improves after chemotherapy, it occurs in timely manner. Additionally, it is conceivable that prompt resolution of lactic acidosis could be a surrogate marker of inducing remission.
Both intravenous (IV) bicarbonate and hemodialysis have been used to control the lactic acidosis until chemotherapy can treat the malignancy. The use of IV bicarbonate as an interim treatment of profound acidosis (in either the presence or absence of malignancy) remains a contentious issue [27–30]. As severe acidosis can cause respiratory fatigue and hemodynamic instability, intravenous bicarbonate is often used to attenuate the sequelae of systemic acidosis. However, there are potential side effects from using IV sodium bicarbonate. The most obvious of which are hypervolemia and hypernatremia [31]. Additionally, sodium bicarbonate infusion may actually increase lactic acid production [28]. The rise in lactate levels has been seen in human [32] and animal [33, 34] studies. The decreased oxygen delivery has been postulated to occur from both a reduction in PaO2 [35] as well as increased affinity of oxygen to hemoglobin resulting from the rise in systemic pH following IV bicarbonate infusion [36]. The effect of IV bicarbonate on mortality or lactate concentrations in the setting of malignancy induced lactic acidosis has not been directly studied. From our review of the literature, 20 of the 29 cases used IV bicarbonate to treat the acidosis. Two patients received IV bicarbonate without adjunctive chemotherapy, and both died within days. Of the 7 patients who went into remission, 6 were on IV bicarbonate. Although it is unlikely that bicarbonate administration provides any mortality benefit beyond chemotherapy, this has not been directly studied.
Renal replacement therapy (RRT), including hemodialysis, peritoneal dialysis, or hemofiltration can be used to remove lactate and correct acidosis [37]. Prikis et al. recently reported a case of lymphoma induced lactic acidosis successfully treated with sustained low efficiency dialysis implemented as a temporary measure to correct acidosis and hypervolemia until chemotherapy was initiated [5]. Two other cases of lymphoma induced lactic acidosis have been treated with hemodialysis and chemotherapy, both of whom died within 10 days. As the prognosis of lymphoma induced lactic acidosis is grim, the only hope for remission is starting chemotherapy. Although IV bicarbonate and hemodialysis can be implemented in an attempt to control the acidosis, it must be emphasized that these measures should be viewed as a bridge until the underlying cause is treated.
In conclusion, lactic acidosis is an ominous sign in patients with lymphoma or leukemia. The exact pathogenesis of this condition remains unclear. Prompt diagnosis and early treatment of underlying lymphoma or leukemia is the only way to achieve complete resolution of lactic acidosis in these patients.
SillosE. M.ShenepJ. L.BurghenG. A.PuiC.-H.BehmF. G.SandlundJ. T.Lactic acidosis: a metabolic complication of hematologic malignancies: case report and review of the literature20019292237224610.1002/1097-0142(20011101)92:9<2237::AID-CNCR1569>3.0.CO;2-92-s2.0-0035498763JabrF. I.Lactic acidosis in patients with neoplasms: an oncologic emergency200681111505150610.4065/81.11.15052-s2.0-33750582068FriedenbergA. S.BrandoffD. E.SchiffmanF. J.Type B lactic acidosis as a severe metabolic complication in lymphoma and leukemia: a case series from a single institution and literature review200786422523210.1097/MD.0b013e318125759a2-s2.0-34447504305HeY.-F.WeiW.SunZ.-M.Fatal lactic acidosis and hypoglycemia in a patient with relapsed natural killer/T-cell lymphoma200724350550910.1007/BF028487722-s2.0-34548064872PrikisM.BhasinV.YoungM. P.GennariF. J.RimmerJ. M.Sustained low-efficiency dialysis as a treatment modality in a patient with lymphoma-associated lactic acidosis20072282383238510.1093/ndt/gfm2812-s2.0-34547843583DoganE.ErkocR.SayarliogluH.AliciS.DilekI.AliciO.Fatal lactic acidosis due to leukemic transformation in a patient with non-Hodgkin's lymphoma: case report200522544344610.1007/BF028498632-s2.0-31144460717GlasheenJ. J.jeffrey.glasheen@uchsc.eduSorensenM. D.Burkitt's lymphoma presenting with lactic acidosis and hypoglycemia—a case presentation20054622812832-s2.0-002710463410.1080/10428190400016723OhtsuboK.ImamuraR.SekiR.Blastoid variant of mantle cell lymphoma with lactic acidosis: a case report200480542843110.1532/IJH97.040692-s2.0-19944429312Di ComiteG.DagnaL.PiattiP. M.MontiL. D.TantardiniF.PraderioL.Hypoglycaemia and lactic acidosis in a MALT non Hodgkin's lymphoma2002436134113422-s2.0-0035992328ThakurV.SanderG.RabS. T.Hodgkin's disease and lactic acidosis200188327627710.1159/0000460032-s2.0-0034937236YasinM.HartranftT. H.Primary hepatic lymphoma: unusual presentation and clinical course199763119519532-s2.0-0030729046DürigJ.FiedlerW.De WitM.SteffenM.HossfeldD. K.Lactic acidosis and hypoglycemia in a patient with high-grade non-Hodgkin's lymphoma and elevated circulating TNF-α1996722979910.1007/s0027700501462-s2.0-0029921389Scheurleer-HommesM. L.SchaafsmaM. R.Kluin-NelemansJ. C.Lactic acidosis in a patient with B-cell non-Hodgkin's lymphoma199486106510662-s2.0-23444443834CasparC. B.OelzO.Lactic acidosis in malignant lymphoma19919121971982-s2.0-002600879110.1016/0002-9343(91)90015-PDoolittleG. C.WursterM. W.RosenfeldC. S.BodensteinerD. C.Malignancy-induced lactic acidosis19888145335362-s2.0-0023899274VanderMolenL. A.SwainS.LongoD. L.Lactic acidosis in lymphoma: prompt resolution with therapy directed at lymphoma19888013107710782-s2.0-0023728897JohnsonD. A.WhelanT. V.Lactic acidosis—a review of the association with neoplastic disorder198515042062082-s2.0-0022048260LeydenM.SullivanJ.SzerJ.BrodieG.Fatal lactic acidosis in lymphoma. A report of two cases19831321791802-s2.0-0020515820NadimintiY.WangJ. C.ChouS.-Y.Lactic acidosis associated with Hodgkin's disease. Response to chemotherapy1980303115172-s2.0-0019222003MintzU.SweetD. L.Jr.BitranJ. D.UltmannJ. E.Lactic acidosis and diffuse histiocytic lymphoma (DHL)1978443593652-s2.0-0018124314ScheererP. P.PierreR. V.SchwartzD. L.Reed-Sternberg-Cell leukemia and lactic acidosis; unusual manifestations of Hodgkin's disease1964270274278RaoK. S.MehtaR.FerlinzJ.Unusual presentation of cancer-induced lactic acidosis1988647524752-s2.0-0024033109FujimuraM.ShirasakiH.KasaharaK.MatsudaT.Small cell lung cancer accompanied by lactic acidosis and syndrome of inappropriate secretion of antidiuretic hormone199822325125410.1016/S0169-5002(98)00081-62-s2.0-0032413282RecordC. O.IlesR. A.CohenR. D.WilliamsR.Acid base and metabolic disturbances in fulminant hepatic failure19751621441492-s2.0-0016612242MazurekS.BoschekC. B.EigenbrodtE.The role of phosphometabolites in cell proliferation, energy metabolism, and tumor therapy199729431533010.1023/A:10224905127052-s2.0-0030683603ArcherS.Bache-WiigB.Lactic acidosis B associated with solid tumors19866995115142-s2.0-0022772933MathieuD.NeviereR.BillardV.FleyfelM.WattelF.Effects of bicarbonate therapy on hemodynamics and tissue oxygenation in patients with lactic acidosis: a prospective, controlled clinical study19911911135213562-s2.0-0025934559ForsytheS. M.SchmidtG. A.Sodium bicarbonate for the treatment of lactic acidosis200011712602672-s2.0-0033976601CuhaciB.LeeJ.AhmedZ.ForsytheS. M.SchmidtG. A.Sodium bicarbonate controversy in lactic acidosis200011838828842-s2.0-0033796682HalperinM. L.Cheema-DhadliS.HalperinF. A.KamelK. S.Rationale for the use of sodium bicarbonate in a patient with lactic acidosis due to a poor cardiac output19946632582612-s2.0-0028125570MattarJ. A.WeilM. H.ShubinH.SteinL.Cardiac arrest in the critically ill—part II: hyperosmolal states following cardiac arrest19745621621682-s2.0-0015955779FieldsA. L. A.WolmanS. L.HalperinM. L.Chronic lactic acidosis in a patient with cancer: therapy and metabolic consequences1981478202620292-s2.0-0019434960GrafH.LeachW.ArieffA. I.Metabolic effects of sodium bicarbonate in hypoxic lactic acidosis in dogs19852495, part 2F6306352-s2.0-0022151387RheeK. H.ToroL. O.McDonaldG. G.NunnallyR. L.LevinD. L.Carbicarb, sodium bicarbonate, and sodium chloride in hypoxic lactic acidosis: effect on arterial blood gases, lactate concentrations, hemodynamic variables, and myocardial intracellular pH199310439139182-s2.0-0027183677BersinR. M.ChatterjeeK.ArieffA. I.Metabolic and hemodynamic consequences of sodium bicarbonate administration in patients with heart disease19898717142-s2.0-0024394995BellinghamA. J.DetterJ. C.LenfantC.Regulatory mechanisms of hemoglobin oxygen affinity in acidosis and alkalosis19715037007062-s2.0-0015023774FallP. J.SzerlipH. M.Lactic acidosis: from sour milk to septic shock200520525527110.1177/08850666052786442-s2.0-30544441255