Recurrence of unilateral angioedema of the tongue: A case report

Abstract

BACKGROUND

Angioedema is a disorder characterized by edema of the face, lips, tongue, and extremities due to increased vascular permeability. Angioedema of the tongue usually occurs bilaterally, and the incidence of unilateral angioedema of the tongue is rare. This study reports a rare case of unilateral angioedema of the tongue with no identifiable cause and repeated recurrence even after discontinuation of an angiotensin-converting enzyme inhibitor.

CASE SUMMARY

The patient was a 65-year-old woman with pre-existing hypertension and hyperlipidemia and had been receiving 20 mg/d of lisinopril. She was diagnosed with angioedema due to unilateral swelling of the tongue. No airway obstruction was observed, and the symptoms improved following the administration of 0.3 mg of epinephrine intramuscularly and 125 mg of methylprednisolone intravenously. Although lisinopril was discontinued, unilateral angioedema of the tongue continued to recur every 2-5 mo, with the symptoms improving following the administration of prednisolone and an antihistamine. Daily oral administration of 500 mg of tranexamic acid after dinner prevented the recurrence of angioedema.

CONCLUSION

Careful monitoring and identification of the underlying mechanism play a crucial role in the treatment of angioedema.

Key Words: Angioedema, Tongue, Unilateral, Bradykinin, Tranexamic acid, Case report

Core Tip: This study describes the case of a 65-year-old woman who presented with unilateral angioedema of the tongue with no identifiable cause and who showed repeated recurrence of angioedema after discontinuation of an angiotensin-converting enzyme (ACE) inhibitor. She had a history of hypertension and hyperlipidemia for 32 years and had been receiving 20 mg/d of lisinopril for 32 years. The ACE inhibitor was suspected as the cause of angioedema; therefore, its use was discontinued. However, angioedema of the left unilateral tongue continued to recur. Recurrence of the unilateral angioedema did not occur following the administration of 500 mg of tranexamic acid.

INTRODUCTION

Angioedema, a disorder characterized by localized swelling of the skin and subcutaneous tissues, is caused by a transient increase in capillary permeability. It was first described by Quinche[1] in 1882 and is also known as Quinche’s edema[1,2]. Angioedema primarily occurs on the face, lips, tongue, and extremities. The causes of angioedema include trauma; infection; drugs, such as angiotensin-converting enzyme (ACE) inhibitors; allergic reactions; hereditary factors; and acquired C1 inhibitor deficiency[2]. Angioedema in the oral cavity can cause airway obstruction and may require airway clearance.

Angioedema of the tongue usually occurs bilaterally, and cases of unilateral angioedema of the tongue are rare. The most frequently reported cause of unilateral tongue angioedema is drugs, such as ACE inhibitors and recombinant tissue-type plasminogen activators (rtPA), and recurrence of angioedema has not been reported after discontinuation of these drugs[3-16]. Herein, we describe a rare case of unilateral angioedema of the tongue with no identifiable cause that recurred repeatedly even after discontinuation of an ACE inhibitor.

CASE PRESENTATION

Chief complaints

A 65-year-old Japanese woman was presented to the emergency department at 1:00 a.m. with unilateral swelling on the left side of the tongue.

History of present illness

The patient complained of sudden development of unilateral swelling on the left side of the tongue while falling asleep.

History of past illness

She had a history of hypertension and hyperlipidemia for 32 years and had been receiving 20 mg/d of lisinopril, 5 mg/d of amlodipine, 1 mg/d of doxazosin, 2 mg/d of pitavastatin, and 500 mg/d of polyenephosphatidylcholine. She had been receiving lisinopril, an ACE inhibitor, for 32 years. There was no history of food allergies, allergic rhinitis, atopic dermatitis, or bronchial asthma. She had eaten her dinner the previous day at around 6:00 p.m. and had not consumed anything other than her usual diet. She had no history of alcohol consumption or smoking.

Personal and family history

There was no family history of angioedema.

Physical examination

The patient’s vital signs on arrival at our hospital were as follows: Conscious with a Glasgow Coma Scale score of 15 points (E4V5M6); body temperature, 35.9 ℃; blood pressure, 137/78 mmHg; pulse, 88 beats/min; no tachypnea; and SpO₂ level, 98% (room air). The patient was obese; her height was 164.6 cm, weight 101.2 kg, and body mass index 37.4 kg/m². Although she had difficulty in speaking due to unilateral tongue edema, the airway was open, and she was able to breathe (Figure 1). No abnormalities were detected in the heart and respiratory sounds. Edema was not observed in any region other than the tongue. Skin rashes, including wheals, were also not observed.

Figure 1  Unilateral angioedema of the tongue.

Laboratory examinations

Table 1 presents the results of laboratory examinations at the time of her visit. The white blood cell (WBC) count was 5560/μL (eosinophils 0.4%), C-reactive protein (CRP) level was 0.16 mg/dL, platelet count was 91000/μL, serum albumin level was 4.0 g/dL, total bilirubin level was 1.0 mg/dL, prothrombin time activity was 69.7%, and the prothrombin time-international normalized ratio was 1.25.

Table 1 Results of laboratory examinations on admission.

Parameter	Recorded value	Standard value
White blood cell count (µL)	5560	4000-9000
Neutrophils (%)	91.1	40.0-71.9
Lymphocytes (%)	7.4	26.0-46.6
Monocytes (%)	1.1	2.3-7.7
Eosinocytes (%)	0.4	0.2-6.8
Hemoglobin (g/dL)	13.7	11.3-15.2
Platelet count (µL)	9.1 × 104	15.0-35.0 × 104
Prothrombin time/activity (%)	69.7	80-120
International normalized ratio	1.25	0.90-1.20
Activated partial thromboplastin time (s)	37.0	26.0-35.0
C-reactive protein (mg/dL)	0.16	< 0.30
Total protein (g/dL)	6.9	6.7-8.3
Albumin (g/dL)	4.0	3.9-4.9
Total bilirubin (mg/dL)	1.0	0.2-1.2
Aspartate aminotransferase (IU/L)	64	13-33
Alanine aminotransferase (IU/L)	49	8-42
Lactase dehydrogenase (IU/L)	253	124-222
Creatine kinase (IU/L)	213	45-163
Blood urea nitrogen (mg/dL)	14.4	8.0-20.0
Creatinine (mg/dL)	0.52	0.40-0.80
Sodium (mEq/L)	143.6	135.0-147.0
Potassium (mEq/L)	3.8	3.4-4.8
Chloride (mEq/L)	107	98-110
Glucose (mg/dL)	126	70-109
Hemoglobin A1c (%)	5.0	4.6-6.2
Ferritin (ng/mL)	116.5	5.0-157.0
Total cholesterol (mg/dL)	157	130-219
Triglyceride (mg/dL)	43	30-150
High-density lipoprotein cholesterol (mg/dL)	76	48-103
Low-density lipoprotein cholesterol (mg/dL)	73	70-139

Imaging examinations

Computed tomography (CT) of the head did not reveal the presence of any ischemic lesions, and echocardiography did not reveal stenosis or dissection of the carotid artery. Abdominal echocardiography, performed due to a history of liver injury, revealed an irregular liver surface and coarse parenchyma, with no ascites. The Child-Pugh score was 6 points, grade A, and the fibrosis-4 index (FIB-4) was 6.53[17]. The patient tested negative for hepatitis B surface antigen and hepatitis C virus antibodies. Based on the abdominal echocardiography images and the FIB-4, she was diagnosed with cirrhosis of the liver due to non-alcoholic steatohepatitis.

FINAL DIAGNOSIS

Additional tests were performed to identify the cause of angioedema, and the data are shown in Table 2. The complement test revealed normal C1 inhibitor activity of 73%, C3 level of 75 mg/dL, C4 level of 10 mg/dL, CH50 level of 26.7 U/mL, and C1q level of 12.6 mg/dL. Blood tests revealed a nonspecific immunoglobulin E level of 71.81 IU/mL, an antinuclear antibody level of < 40 ×, and an estradiol level of 16.8 pg/mL. A diagnosis of unilateral angioedema of the tongue was made; however, the cause of angioedema remained unclear.

Table 2 Additional tests performed to identify the cause of angioedema.

Parameter	Recorded value	Standard value
C1 inhibitor activity (%)	73	70-130
C3 (mg/dL)	75	86-160
C4 (mg/dL)	10	17-45
CH50 (U/mL)	26.7	25.0-48.0
C1q (mg/dL)	12.6	8.8-15.3
Nonspecific IgE (IU/mL)	71.81	< 170
Antinuclear antibody	< 40 ×	< 40 ×
Estradiol	16.8	< 47.0 pg/mL (postmenopausal)

IgE: Immunoglobulin E.

TREATMENT

The patient was considered to be at risk of developing airway obstruction based on the possibility of anaphylaxis. Therefore, 0.3 mg of epinephrine was administered intramuscularly, and 125 mg of methylprednisolone was administered intravenously. A gradual improvement in symptoms was observed, and the unilateral swelling of the tongue subsided completely after 17 h. The symptoms did not worsen during hospitalization for follow-up, and she was discharged on the second day of hospitalization.

The ACE inhibitor (lisinopril) was suspected to be the cause of angioedema; therefore, its use was discontinued. However, angioedema of the left unilateral tongue recurred after 12 d. Consequently, 20 mg of prednisolone (PSL) and 25 mg of hydroxyzine pamoate, an antihistamine, were administered. The symptoms resolved within 8 h.

OUTCOME AND FOLLOW-UP

Although the cause of angioedema could not be identified, treatment with loratadine 10 mg/d was initiated based on the assumption of an allergic mechanism involving histamine. However, unilateral angioedema of the tongue continued to recur every 2-5 mo. The involvement of the left and right sides was not constant. The symptoms improved within 30 min to 12 h after receiving a single dose of 20 mg of PSL and 25 mg of hydroxyzine pamoate, without any symptoms of respiratory disturbance or airway obstruction. In total, 10 recurrent episodes of unilateral angioedema of the tongue were reported. The sixth recurrence occurred on the day after receiving the third dose of the coronavirus disease 2019 vaccine; however, no apparent trigger was noted for the other episodes. Notably, all episodes of recurrences occurred only between midnight and 6 a.m. and did not occur during the day. During the tenth episode, the symptoms improved within hours following the administration of PSL and an abortive dose of antihistamine; however, angioedema continued to recur every 1-4 d, resulting in three more episodes of recurrence. Therefore, the administration of loratadine was discontinued, and regular oral administration of hydroxyzine pamoate, a sedating antihistamine, was initiated. However, recurrences continued every few days. Thus, the administration of 500 mg of tranexamic acid daily after dinner was initiated, following which the recurrence of the unilateral angioedema ceased, and the patient has not experienced any recurrence for 5 mo since starting tranexamic acid (Figure 2).

Figure 2 Clinical course and treatment of the angioedema. mPSL: Methylprednisolone; PSL: Prednisolone; COVID-19: Coronavirus disease 2019.

DISCUSSION

This report presents the case of a patient with recurrent unilateral angioedema of the tongue. Unilateral angioedema of the tongue is a rare condition; to the best of our knowledge, this is the first case report to present multiple episodes of unilateral angioedema of the tongue after discontinuation of an ACE inhibitor.

The reasons underlying the unilateral presentation of the angioedema of the tongue are not well understood. However, it is speculated that unilateral edema precedes bilateral angioedema as its origin[4] and that the asymmetry of the lingual nerve results in a left-right difference in the chemical microenvironment, resulting in unilateral susceptibility to the action of the inflammatory mediators[8].

Since the incidence of unilateral angioedema of the tongue is rare, we performed a comprehensive literature review. A search of the database of PubMed using the keyword “unilateral tongue angioedema” retrieved 21 articles and 17 case reports (last retrieved on August 23, 2023). Among the retrieved results, details of the 15 cases that were reported in English are presented in Table 3[3-16]. The median age of the patients was 68 years (range: 30-80 years). Eight patients were male and seven were female. Regarding angioedema caused by ACE inhibitors in 11 cases, administration of ACE inhibitors alone was the cause in nine cases, whereas administration of rtPA for cerebral ischemic disease in addition to ACE inhibitors was the cause in 1 case. In the remaining one case, the patient receiving an ACE inhibitor developed a subdural hematoma, and angioedema developed as a result of the removal of the blood specimen. In the other cases, angioedema was caused by the administration of rtPA for cerebral infarction, acetaminophen, aspirin, and an angiotensin receptor blocker.

Table 3 Clinical features of cases of unilateral angioedema of the tongue in the literature.

Case	Ref.	Age (yr) /sex	Causes of Angioedema	Comorbidity	Type of ACEI and duration of use	Other medication	Treatment of angioedema	Time to symptom improvement	Recurrence
1	Mlynarek et al[3]	73/F	ACEI	Diabetes mellitus, hypertension, hypothyroidism, Bell's palsy, rectal surgery for rectal cancer	Enalapril, 3 yr	Nifedipine, lorazepam, clonidine, levothyroxine, aspirin, and hydrochlorothiazide	MPSL, diphenhydramine, and penicillin. Enalapril was not discontinued initially	Overnight	Symptoms recurred after 3 wk. Enalapril was discontinued subsequently. No further recurrence at the 1-, 3-, and 12-mo follow-ups
2	Kaptanoglu and Aytas[4]	44/M	Aspirin	Headache	None	None	Epinephrine subcutaneously, mPSL, chlorphenoxamine	2 h	No recurrence at the 10-d follow-up
3	Chan et al[5]	68/F	ACEI	Type 2 diabetes mellitus and hypertension	Benazepril, several mon	Humulin 70/30, amlodipine, and chlorthalidone	Intravenous diphenhydramine, mPSL, and famotidine. PSL, famotidine, and diphenhydramine	Within 24 h	No recurrence at the 2-mo follow-up
4	Ee et al[6]	71/M	ACEI, evacuation of the subdural hematoma	Subdural hemorrhage, hypertension, history of deep vein thrombosis and right temporal subdural hemorrhage secondary to warfarin therapy	Perindopril, 3 mo	Pantoprazole (40 mg once daily), one dose of intravenous ceftriaxone (2 g), and pre-operative prophylaxis (evacuation of subdural hematoma)	Intravenous dexamethasone. Perindopril was discontinued	48 h	No recurrence at the 2-wk follow-up
5	Kuhlen and Forcucci[7]	62/M	ACEI	Hypertension, type 2 diabetes, vascular dementia, end-stage renal disease after cadaveric renal transplant	Lisinopril, recently	Other medications were not mentioned. He had undergone a kidney transplant	Diphenhydramine, famotidine, and mPSL. Intubation	48 h	NA
6	Leung et al[8]	64/F	ACEI	Liver transplant	Lisinopril, 2 d	Mammalian target of rapamycin inhibitor for the liver transplant	Intravenous steroids and antihistamine. Lisinopril was discontinued	Within h	No recurrence at the 4-wk follow-up
7	Amey et al[9]	76/M	ACEI	Allergic rhinitis, hypertension, ischemic heart disease, and two percutaneous coronary interventions	Perindopril, 10 yr	Clopidogrel, aspirin, pravastatin, and diclofenac for a rotator cuff injury. Clopidogrel and atorvastatin	Intravenous steroids and antihistamine. Intubation. Perindopril was discontinued. Intubation. Perindopril was discontinued	48 h	No recurrence
8	Amey et al[9]	78/M	ACEI	Asthma with moderate airflow obstruction, percutaneous coronary interventions performed 7 yr prior, epileptic	Perindopril, 7 yr	Clopidogrel, atorvastatin, and phenytoin	Epinephrine nebulizations, steroids, and antihistamines. Perindopril was discontinued	24 h	No recurrence
9	Deepthi et al[10]	30/F	Acetaminophen	Tension headache	None	Acetaminophen	Acetaminophen was discontinued, intravenous dexamethasone, intravenous diphenhydramine	2 d	NA
10	Arts et al[11]	67/M	ACEI, rtPA, cerebrovascular ischemia of the left hemisphere	Right-sided hemiparesis, and cerebrovascular ischemia of the left hemisphere	NA	NA	Intubation, clemastine, and adrenaline	NA	NA
11	Imai et al[12]	69/F	ARB	Hypertension, diabetes mellitus, and dysarthria	None (ARB used)	Nicardipine, azilsartan, glimepiride, metformin, vildagliptin, and aspirin	Azilsartan was changed to a carvedilol. Aspirin was discontinued	NA	NA
12	Al-Hoqani et al[13]	78/F	ACEI	Hypertension, hyperlipidemia, ischemic heart disease, bilateral knee osteoarthritis, and urinary incontinence	Lisinopril, 2 yr	Amlodipine, rosuvastatin, aspirin, calcium with vitamin D, bisoprolol, diclofenac sodium, and a multivitamin	Chlorpheniramine maleate intramuscularly, Lisinopril was stopped	12 h	No recurrence at the 2-mo follow-up
13	Wollmach et al[14]	49/F	Acute ischemic stroke, rtPA	Pulmonary sarcoidosis and post liposarcoma resection. Angioedema after receiving NSAIDS	None	None	mPSL, clemastine, ranitidine, intubation, and icatibant	48 h	NA
14	Lee and Bryant[15]	80/M	ACEI	Hypertension	Benazepril, 4 yr	Amlodipine	mPSL, diphenhydramine, and famotidine	48 h	NA
15	Gil Braga et al[16]	55/M	ACEI	Hypertension	Enalapril, 3 yr	None	Observation, enalapril was discontinued	Several h	No recurrence at the follow-up a few mon later
16	This present case	65/F	Unknown	Hypertension, hyperlipidemia, obesity, NASH, and liver cirrhosis	Lisinopril, 32 yr	Amlodipine, doxazosin, pitavastatin, and polyene phosphatidylcholine	Epinephrine intramuscular injection, mPSL. Lisinopril was discontinued	17 h	Recurrences occurred 10 times at the 2-yr follow-up

NA: Not applicable; ACEI: Angiotensin-converting enzyme inhibitor; mPSL: Methylprednisolone; rtPA: Recombinant tissue-type plasminogen activator; NSAIDS: Non-steroidal anti-inflammatory drugs; NASH: Non-alcoholic steatohepatitis; ARB: Angiotensin receptor blocker.

Recurrence was observed in one case with continuation of ACE inhibitors[3]; no further recurrences were observed following discontinuation of the ACE inhibitor. In the other cases, the causative agent or invasion was discontinued, and no recurrence was reported in any of the cases.

The mechanisms underlying the development of angioedema can be divided into histamine-mediated and bradykinin-mediated mechanisms[18]. Bradykinin-mediated angioedema has a late onset, no urticaria, and no known or suspected allergic triggers[18]. Since the patient in the present case had not presented with urticaria, the mechanism underlying the development of angioedema was suspected to be bradykinin-mediated rather than histamine-mediated mechanism. However, the symptoms improved with the administration of PSL and antihistamines; therefore, a histamine-related mechanism for the onset of the disease could not be ruled out.

ACE inhibitors cause angioedema by inhibiting the breakdown of bradykinin[19]. The incidence of angioedema in patients receiving ACE inhibitors is reported to be 0.20%[19]. Although angioedema occurs within the first week of treatment in most cases, it can occur at any time. Notably, there have been reports of angioedema occurring after receiving 23 years of continuous treatment[19]. Angioedema can also occur after discontinuation of treatment. Although the duration is unclear, there have been reports of angioedema recurring more than 6 mo after discontinuation of ACE inhibitors[19]. Since the involvement of a bradykinin-related mechanism was suspected in the present case, the ACE inhibitor was initially considered the cause of angioedema. However, unlike previous reports, other causes were also suspected, as the angioedema had developed after 32 years of continuous ACE inhibitor use, and its recurrence was observed more than 2 years after discontinuation.

The differential diagnoses of the cause of angioedema other than ACE inhibitors in this case are discussed below. Histamine is involved in the mediation of allergy and anaphylaxis, and it can cause bronchospasm, wheezing, urticaria, and hypotension. However, these symptoms were not observed in our patient, and there was no history of food intake or other factors that could have triggered them. In addition, there was no history of allergic rhinitis, which seems unlikely, or trauma.

Infection was unlikely, as there was no fever or hyperinflammatory response, such as increased WBC counts or elevated CRP levels. Similarly, hereditary or acquired angioedema was considered unlikely due to the absence of C1 inhibitor activity or decreased C1q levels.

The literature review yielded no reports of angioedema associated with cirrhosis. There have been no reports of hereditary angioedema type 3 in Japan, with no increase in estrogen level associated with cirrhosis reported in the present case.

The incidence of angioedema-like unilateral enlargement of the tongue due to acute neurodegeneration associated with internal carotid artery dissection has been reported[20,21]. In the present case, considering the absence of carotid dissection or stenosis on carotid artery echocardiography, absence of ischemic changes on CT, and repeated recurrences, these causes were ruled out.

The possibility of drugs other than ACE inhibitors causing angioedema was also examined. Adverse reactions to drugs were assessed using the naranjo adverse event causality rating scale[22], with each drug receiving the following scores: Lisinopril, 2 points; amlodipine, 2 points; doxazosin, 2 points; pitavastatin, 2 points; and polyenephosphatidylcholine, 2 points. Thus, these drugs were unlikely to cause adverse reactions. There have been several reports of the development of angioedema after the administration of statins, and the development of angioedema due to the administration of pitavastatin has also been reported[23]. Dose-dependent development of angioedema with the administration of statins has been reported[24]. However, angioedema developed within a short period of initiating or increasing the dose in these cases, unlike that in the present case, wherein angioedema recurred after dose reduction and discontinuation; thus, it was considered an unlikely cause. The development of angioedema due to the administration of polyenephosphatidylcholine has not been reported; however, the incidence of angioedema has been reported with the addition of benzoic acid[25]. Since the symptoms persisted after discontinuing the drug in the present study, polyenephosphatidylcholine was considered an unlikely cause.

Reports of angioedema caused by the administration of amlodipine are rare but have been increasing in recent years[26]. There have been no reports of doxazosin-induced angioedema; however, its incidence has been reported in interventional studies[27]. The incidence of angioedema after the administration of these drugs is rare, and the Naranjo Causality scores[22] of these drugs were low in the present case; thus, these drugs were unlikely to be the cause of angioedema. Nevertheless, discontinuation of the drugs was considered in the present study.

The abovementioned factors were highly unlikely to be the cause in the present case; thus, the cause remained unclear. Based on the lack of recurrence with the regular oral administration of tranexamic acid, the risks associated with the discontinuation or modification of antihypertensive medications, and the causal relationship of each drug with angioedema, antihypertensive medications should not be discontinued, and no further verification or intervention should be undertaken. Tranexamic acid inhibits the fibrinolytic system, which is assumed to be involved in the mechanism underlying the relative increase in C1 inhibitor level[28]. Although there was no decrease in C1 inhibitor level during the symptomatic period in the present case, the decrease in bradykinin level with the increase in C1 inhibitor level is assumed to have prevented the onset of angioedema. In the future, increasing the dose of tranexamic acid, discontinuation of amlodipine or doxazosin, and regular oral administration of steroids may be considered if angioedema recurs.

This study has several limitations. First, as this was a case report, it is difficult to generalize the findings to other patients with unilateral tongue angioedema. In addition, the cause of the recurrence of the disease was not identified, and its long-term health effects remain unknown. In the future, we aim to study the long-term health effects in this patient by conducting long-term observations and examining a population of patients with recurrent angioedema. Further research is required to identify the exact changes in the local environment (i.e., the affected half of the tongue).

CONCLUSION

We report a case of a patient with recurrent unilateral angioedema of the tongue. Although ACE inhibitors are the most common causes of unilateral angioedema of the tongue, other causes may also result in the development of angioedema. Thus, other causes should be considered if the patient shows relapses after discontinuation of ACE inhibitors. In addition, if no cause can be identified, the mechanism of the relapse should be considered during treatment.