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Opposite changes in blood pressure and pulse rate in two patients with distigmine and rivastigmine intoxication

JA Clinical Reports volume 6, Article number: 17 (2020) Cite this article

Abstract

Background

Cholinergic crisis caused by cholinesterase inhibitors is rare but life-threatening. Clinical manifestations are thought to be similar to those caused by organophosphates.

Case presentation

A 77-year-old woman on a standard dose of distigmine presented with impaired consciousness, blood pressure (BP) of 69/40 mmHg, a pulse rate (PR) of 60 beats/min, miosis, bronchorrhea, and serum cholinesterase (ChE) of 8 IU/L. After discontinuation of distigmine, altered mental status and pupil miosis were gradually resolved in 5 days with a concomitant increase of serum ChE. A 91-year-old woman presented with a headache, BP of 202/86 mmHg, PR of 83 beats/min, miosis, 9 rivastigmine patches on her knees, and ChE of 22 IU/L. The day after close observation without rivastigmine use, her symptoms were almost resolved with a concomitant increase of serum ChE.

Conclusion

Our cases and a literature review suggested that, in contrast to distigmine, rivastigmine-induced cholinergic crisis caused hypertension and tachycardia.

Background

Cholinergic crisis is an adverse drug effect associated with cholinesterase inhibitors. A nationwide database study showed that the iatrogenic cholinergic crisis is a rare but potentially life-threatening condition in Japan [1]. The clinical features resemble carbamate and organophosphate poisoning with symptoms that include both muscarinic (e.g., salivation, lacrimation, urination, defecation, miosis, bronchorrhea, and bradycardia) and nicotinic (e.g., muscle weakness, fasciculations, and paralysis) stimulation [2, 3]. Here, we present 2 cases of cholinergic crisis caused by the reversible cholinesterase inhibitors; distigmine and rivastigmine focused on changes in blood pressure (BP) and pulse rate (PR).

Case presentation

Case 1

A 77-year-old bedridden Japanese woman with a body mass index (BMI) of 19.8 kg/m2 receiving 5 mg of distigmine daily for a neurogenic bladder was transferred to the emergency department of our hospital because of impaired consciousness. On admission, she was disoriented with a Glasgow coma scale of 10 (E4V2M4), and her vital signs were BP 69/40 mmHg, PR 60 beats/min, and oxygen saturation 79% with oxygen therapy via a nonrebreather face mask at 10 L/min. Physical examination revealed pupil miosis, excess salivation, urinary incontinence, and watery diarrhea, but no obvious signs of dehydration. A blood gas analysis suggested acute hypercapnic respiratory failure (arterial carbon dioxide, 51.8 mmHg; arterial oxygen tension, 41.5 mmHg). Laboratory data showed mild leukocytosis and serum cholinesterase (ChE) of 8 IU/L. Other blood tests, including kidney function, liver function including serum albumin, C-reactive protein, and blood glucose, were within normal ranges. Her head computed tomography (CT) scan, electrocardiography, and chest X-ray were unremarkable. Her chest CT scan revealed slight centrilobular nodules with a large amount of intrabronchial secretion. She was diagnosed with distigmine-induced cholinergic crisis followed by acute hypercapnic respiratory failure because of alveolar hypoventilation due to bronchorrhea.

After admission, distigmine was discontinued, and she received supplemental oxygen therapy and ceftriaxone treatment for a possible concurrent pneumonia. Altered mental status, pupil miosis, respiratory failure, excess salivation, urinary incontinence, and watery diarrhea were gradually resolved in 5 days with a concomitant increase of serum ChE (Table 1 (A)).

Table 1 Changes in vital signs and serum cholinesterase before and after both patients’ admissions
Full size table

Case 2

A 91-year-old Japanese woman with Alzheimer’s disease was taken to her primary care physician for a headache and lightheadedness. The patient had normal BMI, and her nutritional status seemed to correspond to the chronological age. Her vital signs were BP 202/86 mmHg, PR 83 beats/min, and oxygen saturation 98% in room air. She was referred to our department for further evaluation. On admission to our hospital, physical examination revealed pupil miosis but no findings of lacrimation, urination, or bronchorrhea. The emergency physician noticed 9 rivastigmine patches (4 patches of a 9-mg/day formula and 5 of a 13.5-mg/day formula) attached to her both knees. She said that she mistakenly used these patches instead of topical analgesia. Laboratory data showed mild leukocytosis and a serum ChE of 22 IU/L. Other blood tests, including kidney function, liver function, C-reactive protein, and blood glucose, were within normal ranges. Her head CT scan, electrocardiography, and chest X-ray were unremarkable. She was suspected to be in cholinergic crisis caused by rivastigmine overdose and was admitted for close observation without rivastigmine use. The day after her admission, her symptoms, headache, lightheadedness, and miosis were almost resolved with a concomitant increase of serum ChE (Table 1 (B)). On day 7, her serum ChE levels returned to baseline at 236 IU/L. Consequently, she was diagnosed with rivastigmine-induced cholinergic crisis.

Discussion

Distigmine is considered as the main causative drug of cholinergic crisis in Japan [1]. Table 2 (A) summarizes case reports describing distigmine-induced crisis. Most reports showed development of hypotension and bradycardia. In some patients, vital signs showed a circulatory shock state, requiring vasopressors. Distigmine can induce bradycardia, which is consistent with the report that pyridostigmine, a combination of two molecules in distigmine, shows heart rate reduction in patients with heart failure [26]. In contrast, as in case 2, patients with rivastigmine intoxication developed elevated BP and a relatively increased PR. These findings are compatible with previous reports (Table 2 (B)). Excessive doses of donepezil, a central acetylcholinesterase inhibitor, induces bradycardia [27,28,29]; therefore, cholinesterase inhibition in the central nervous system may not participate in the mechanism by which rivastigmine cause tachycardia. A standard dose of rivastigmine was shown not to be associated with any changes in BP or PR [30, 31]. Future studies are needed to elucidate the mechanisms of hyperdynamic state induced by rivastigmine overdose.

Table 2 Previous reports showing distigmine and rivastigmine intoxication
Full size table

In case 1, a clinical dosage of distigmine had been administered for 7 years until the patient developed cholinergic crisis. Because her caregivers administered the drug, we ruled out the possibility of distigmine abuse. Her routine checkup before admission showed a stable serum creatinine level of 0.3–0.4 mg/dL over several years, suggesting a ≥ 100 mL/min/1.73m2 estimated glomerular filtration rate (eGFR). However, her serum creatinine was mildly elevated to 0.76 mg/dL on admission to our hospital, meaning that the eGFR decreased to 57 mL/min/1.73m2. Because distigmine is mainly eliminated by renal excretion [32], the relative decrease in distigmine clearance might have been associated with her distigmine overdose.

Our previous study showed an age-dependent decline in serum ChE levels in physically independent adults [33]. As shown in Table 2, a marked decrease in ChE activity was observed in all cases in which the serum ChE was measured. Lower ChE activity may be associated with lower BP and PR in patients who have experienced a distigmine overdose (Table 2 (A)). In acute organophosphate pesticide poisoning, however, associating ChE activity with disease severity remains controversial [34]. Further studies are needed to clarify whether serum ChE reflects the severity of cholinesterase-inhibitor intoxication.

Conclusion

Our findings suggest that, in contrast to distigmine, rivastigmine-induced cholinergic crisis increases the BP and PR. Serum ChE should be periodically measured in patients with cholinesterase inhibitors to avoid life-threatening adverse effects.

Availability of data and materials

The datasets used during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

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Authors’contributions

SH contributed to the clinical care of patients and to the manuscript preparation. MM contributed to the manuscript preparation. All authors read and approved the final manuscript.

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  1. Department of Anesthesiology, Itoigawa General Hospital, 457-1 Takegahana, Itoigawa, Niigata, 941-8502, Japan

    Hiraku Sedogawa & Mitsuhiro Matsuo

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  1. Hiraku Sedogawa
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Correspondence to Mitsuhiro Matsuo.

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Sedogawa, H., Matsuo, M. Opposite changes in blood pressure and pulse rate in two patients with distigmine and rivastigmine intoxication. JA Clin Rep 6, 17 (2020). https://doi.org/10.1186/s40981-020-00323-w

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Keywords

  • Adverse effects
  • Cholinesterase inhibitors
  • Emergencies
  • Vital signs