Rare Post Streptococcal Glomerulonephritis presentations include back pain and constipation.
Paniz Pourpashang,1 Fatemeh Nili,2 Masoumeh Mohkam,3 Arefeh Zahmatkesh4
1 Department of pediatric nephrology, Shahid Beheshti Medical University, Tehran, Iran
2 Department of pathology, Imam Khomeini hospital complex, Tehran university of medical sciences
3Pediatric Nephrology Research Center, Research Institute for Children’s Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
 
Correspondence should be addressed to Arefeh Zahmatkesh; arefeh.zhmtksh@gmail.com
Abstract:
Background: Post-streptococcal glomerulonephritis (PSGN) is a common disease that occurs after pharyngitis or dermatitis involvement with streptococcus. The disease complications are vary including rare neurological disorder like, posterior reversible encephalopathy syndrome (PRES). Although the disease has some common symptoms like hypertension, oliguria or anuria, and neurological defects, there have been no reports of a child having severe back pain or constipation up until this point. Case presentation: Here, we represent a child with severe back pain and constipation that was diagnosed as PRES syndrome followed PSGN. Conclusion: Despite several studies on PSGN, attention to different and rare associated symptoms could help practitioners with accurate diagnoses. In addition, made us investigate the disease entity. Keywords: Post-streptococcal glomerulonephritis, back-pain, constipation, posterior reversible encephalopathy syndrome.
Introduction
The most common cause of acute glomerulonephritis in children is post-streptococcal glomerulonephritis (PSGN), which typically affects children between the ages of 3 and 12 years and is uncommon in children under the age of 3 year. Hematuria, oliguria, edema, and hypertension are the most typical symptoms of PSGN. [1, 2]  The severity of PSGN can vary, and patients may present with subclinical symptoms or require dialysis, and the majority of cases follow pharyngitis caused by streptococci infections.[3, 4] One of the uncommon side effects of PSGN is posterior reversible encephalopathy syndrome (PRES), which typically manifests as headache, vision loss, and seizures. The etiology and clinical manifestation of PRES in children differ from those in adults, but renal diseases predominated in a large systematic review. [5] There are many different PSGN manifestations, but back pain and constipation have not yet received much attention, despite the PRES syndrome diagnosis.  In this study, we described a 10-year-old boy who complained of back pain and constipation and was ultimately diagnosed with PSGN and PRES syndrome together.
Case presentation:
A 10-year-old boy was referred to our clinic complaining of severe constipation, oliguria, and edema. He had previously undergone evaluations and had a raised serum creatinine level. He also had a history of visiting a crowded area and later experiencing fever and other flu-like symptoms. The symptoms were treated with conservative treatment. In his past medical history, he had been completely healthy, had no medical or familial disorders, and had completed his series of vaccinations.
He was referred to our clinic with peri-orbital edema, congestion during a chest exam, hypertension, and anuria. His parents also reported that he had normal urination in the previous two days before a sudden onset of low-volume urination. He was given Lasix with normal saline, but he did not respond to this treatment, and laboratory tests revealed elevated creatinine levels. Table 1. Large kidneys were seen during an abdominal ultrasound study, and as a result of his high creatinine level, anuria, and lack of response to Lasix therapy, the patient underwent sessions of emergent dialysis.
On the second day of hospitalization, the patient started experiencing severe low back pain, which persisted throughout dialysis. Considering the laboratory results and the requirement for daily dialysis, a kidney biopsy was performed with the intention of confirming PSGN (Figure 1); however, the biopsy report revealed PSGN without crescentic features. On the third day of his hospital stay, the patient experienced a seizure that was controlled with phenytoin and carbamazepine. As a result, magnetic resonance imaging (MRI) without contrast was carried out, and the results revealed PRES (Figure 2) He also received rasburicase for hyperuricemia, adjusted doses of ciprofloxacin, meropenem, and cefazoline, as well as five doses of methyl prednisolone for the treatment of PSGN. Following the methylprednisolone prescription, the patient's symptoms improved noticeably, and PSGN therapy was used to treat the patient's back pain and constipation.
The patient was given a clean bill of health and was referred for follow-up exams. At the most recent checkup, his kidney size and creatinine level were both within normal ranges.ranges.
Discussion:
Post streptococcal glomerulonephritis (PSGN) is known as rapid deterioration of kidney functions because of an inflammatory process that included type III hypersensitivity reaction after streptococcal infection. This condition is primarily caused by a beta-hemolytic streptococcus known as nephrogenic streptococci, which affects the glomeruli of the kidneys and small blood vessels. PSGN typically appears in children 1–2 weeks after a sore throat.[4, 6] In our case, a 10-year-old boy had edema, hypertension, and other typical PSGN presentations after experiencing flu-like symptom. The most frequent side effect of PSGN is hypertension, which has a presentation rate of about 64%. After receiving full treatment, hypertension may recur in 3 to 6% of PSGN patients. [7, 8] Children with PSGN involvement may exhibit abnormal neurological symptoms like generalized seizures because of severe hypertension, which affects about 30 to 35 percent of children with PSGN. [4, 9] Additionally, hypertension can result from PRES, a term for hypertensive encephalopathy that was first used in 1996 and PRES causes seizures in patients. [10] One widely accepted PRES mechanism theory links the rise in blood pressure to a hypertensive emergency that causes a breakdown in cerebral autoregulation.[11] despite the fact that the child in our case had one seizure, which was stopped by carbamazepine, it is crucial for pediatricians to be aware of the seizure occurrence in kids with PSGN because it can negatively affect neurological function. In general, PRES with PSGN usually has a favorable prognosis. According to prior studies, clinical findings fully resolve if it is quickly diagnosed and treated.[5]
Although reports on the association between back pain and PSGN on children are limited, some studies reported back pain presentation with different glomerulonephritis diagnosis in adult after infections. Study by Kadapia et al. reported back pain in a 39-year-old man with post infectious glomerulonephritis, who well responded to corticosteroid therapy. [12] Another study showed Minimal change nephrotic syndrome (MCNS) after B type influenza in a 50-years-man with progressive back pain, which spontaneous remission accrued without corticosteroid therapy.[13] However, in our study back pain resolved after corticosteroid administrations, because of less information, more case reports and studies need to investigate the treatment. In addition, no study was reported constipation in PSGN. Although constipation is highly frequent among patients with chronic kidney disease and uremic toxin could affect intestinal motility, [14] there is no reported on constipation in PSGN. Therefor more studies needed.  
The predictors of poor long-term prognosis of PSGN include the presence of nephrotic syndrome, crescent formation on biopsy findings, and renal insufficiency at onset. [15] Wong et al. evaluated 27 PSGN patients who required renal biopsies due to acute severe glomerulonephritis, anuric renal failure, and nephrotic nephritic syndrome. They found that 12 patients required acute dialysis and that 11 patients had crescents that were higher than 50% on the biopsies, and that patients with crescentic glomerulonephritis had a greater need for acute dialysis.[3] Kidney damage may persist years after PSGN because of secondary inflammation after infection due to the nephron’s damages.[16] However, our patient was anuric, after daily dialysis, pathology specimen didn’t reported cresentric and his symptoms start regretting.
In most cases, PSGN is a self-limiting condition, so supportive treatment for managing the effects of overload like edema and hypertension should be carried out. Only symptomatic treatment is advised. [15]  Antihypertensive medications in cases with uncontrolled blood pressure, the use of calcium channel blockers, angiotensin-converting enzyme inhibitors (ACEI), angiotensin receptor blockers (ARBs) are recommended. There is no evidence to support the use of immunosuppressive medications in PSGN patients, but they may be helpful in those with progressive renal failure. [17] Immunosuppressive and antihypertensive medications were used to control the disease in our patient, and with these medications, all patient manifestations were resolved. In fact, after receiving methylprednisolone, all patient manifestations regressed.
conclusion
In conclusion, PSGN is a self-limiting disease that can manifest as hypertension, neurological disorders. However, we can explain these manifestations due to PRES, back pain and constipation were not previously reported in studies with this syndrome. pediatricians and physicians should be aware of these manifestations in PSGN. If there is any doubt about PSGN and the patient exhibits either of these symptoms, PSGN treatment should be initiated. If the constipation or back pain persists, doctors should be evaluated.
Author’s contribution
Conceptualization: PP
Validation: MM and FN
Investigation: PP
Resource:  PP
Data correction: MM and FN
Writing original draft preparation: PP
Writing review and editing: AZ
Visualization: PP and MM
Supervision: MM
Project administration: AZ
Ethics approval and consent to participate: Informed consent was obtained from the patient and parents of the patient prior to being included in the study.
Consent for publication: Written consent for publication was taken from the patient and her parents.
Availability of data and materials: Not applicable.
Competing interests: The authors declare that they have no conflict of interest.
Funding: The authors received no specific funding for this research.
Acknowledgments: We thank the patient and her family for their contribution to this study
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Figure 1: