ABSTRACT
Hiccup is the characteristic voice caused by the sudden closure of the glottis during the contraction of the muscles of respiration especially diaphragm. It usually ends spontaneously in a short time. If it lasts more than one month, it is called as intractable hiccup. Intractable hiccups may lead to malnutrition, hypoxia, arrhythmia, dehydration, depression, tiredness and sleep disorder. Those can affect the quality of life of the patient. It is reported that pharmacologic agents such as gamma-aminobutyric acid receptor agonists, dopamine antagonists, antipsychotics and baclofen may be beneficial in the treatment of intractable hiccups. If success is not achieved with these methods, invasive methods such as phrenic nerve block, regional anesthesia, and phrenic nerve pulse radiofrequency may be applied as alternative therapies. In this case report, it is aimed to present the medical management of a palliative care patient with intractable hiccup. A 55-year-old male patient underwent gastrectomy and distal esophagectomy due to esophagogastric junction tumor. He suffered from intractable hiccup after esophageal hematoma. Bilateral phrenic nerve block was performed; hence no recovery was achieved after five weeks of medical treatment. Most of his complaint about hiccup was recovered after phrenic nerve block.
Introduction
In babies in mother’s womb, hiccups are frequent and are considered as physiological. This is thought to be due to the preparation of the infant’s inspiratory respiratory muscles for respiration after birth. However, hiccups do not serve a physiological purpose in adults; they disturb the humans and the environment due to the sound emitted. Hiccup is a symptom accompanied by a sound which results from sudden and involuntary contractions of accessory respiratory muscles and diaphragm together with the simultaneous closure of the glottis. Hiccups are mostly benign and their frequency can range from 4 to 60 per minute and heal spontaneously in a short time (1). Hiccups are classified into 3 types: Hiccups ending up in 48 hours, persistent hiccups lasting 48 hours-1 month and intractable hiccups lasting more than 1 month (2). Persistent hiccups can cause extremely vital problems such as malnutrition, exhaustion, fatigue, weight loss, hypoxia, bradycardia, arrhythmia, heart block, disturbed sleep patterns, speech disorders, depression, weakness, and dehydration (3). Hiccup reflex arch is composed of afferent pathway consisting of sympathetic nervous system, phrenic and vagus nerves; and efferent pathway connected to glottis and accessory respiratory muscles; and central mediators.
Cerebral events which cause deterioration in reflex arch, neck-related diseases, esophageal, stomach and other gastrointestinal diseases, thoracic diseases such as pneumonia and tumor, cardiovascular diseases, metabolic causes such as alcohol and hypocapnia, pharmacological agents such as carboplatin and cyclophosphamide are among the causes of resistant and persistent hiccups (Table 1) (1,4).
Hiccups are usually relieved with physical maneuvers, such as breathing by closing the nose, increasing carbon dioxide by holding the breath, nasopharyngeal irritation and drinking water slowly for a long time. Patients whose symptoms are not relieved by physical maneuvers can be treated mostly by noninvasive pharmacological methods such as chlorpromazine, gabapentin, metoclopramide, baclofen and proton pump inhibitors. In cases where conservative or pharmacological treatment fails, phrenic nerve block or regional anesthesia may be applied. In cases where these treatments are inadequate, studies have shown that pulsed radiofrequency to the phrenic nerve can be performed (4,5).
Discussion
The rate of admission to hospital with a resistant and persistent hiccup without any physical pathology complaint is 55/100.000. Recurrent hiccups can be seen in 20% of patients with Parkinson’s disease and in 10% of patients with gastroesophageal reflux. In general, the prevalence of hiccups in advanced cancer patients has been reported as 3.9-4.8% (1). In a case series, more than a quarter of patients with esophageal carcinoma experienced hiccups lasting more than 48 hours at least once. The treatment options of this symptom, which deteriorates the quality of life and brings many sets of symptoms, are as follows: Non-pharmacological treatments including simple physical manoeuvres in the first step, pharmacological treatments in the second step and invasive interventions in the third step. In the treatment of persistent hiccups, one of three interventional methods, phrenic nerve block, regional anesthesia, pulsed radiofrequency to phrenic nerve, can be considered as the option of treatment (6).
The pathogenesis of hiccup is complex and has not been clearly explained. As a result of stimulation of vagal, phrenic and sympathetic afferent fibers, efferent nerve fibers result in contractions of diaphragm and intercostal muscles. Neurotransmitters affecting the hiccup reflex arch and which are thought to be responsible for the pathophysiology of hiccup, are gamma-aminobutyric acid and dopamine. It is known that many dopamine antagonists such as chlorpromazine and dopamine agonists such as pramipexole and amantadine have been used in the treatment of persistent hiccups by acting on this complex reflex arch (7). Interventional applications such as phrenic nerve block, regional anesthesia and pulsed radiofrequency to phrenic nerve may be considered in cases who are unresponsive to pharmacological treatments. In addition, in the treatment of patients with resistant hiccup; decompression of the vagus nerve and surgical interventions involving the phrenic nerve can be applied. The last choice is surgical treatment involving the denervation of the phrenic nerve. This method can cause permanent nerve damage and partial paralysis in the diaphragm. For this reason, as the procedure may affect normal breathing, it should only be used as the last option (8).
Kuusniemi et al. (9) reported a 72-year-old patient who developed persistent hiccups after L4-5 laminectomy under general anesthesia. They reported that the patient did not respond to medical and conservative treatment and that the right phrenic nerve block was applied with ultrasonography on the postoperative 17th day, and that ten minutes after the procedure hiccup disappeared and sensomotoric block developed on the right shoulder. They reported that hiccup did not recur in the follow-up and sensomotor block on right shoulder disappeared on the 3rd day of the procedure (9). Arsanious et al. (10) reported a 60-year-old patient who underwent esophageal stent due to tracheoesophageal fistula reported hiccups and developed hiccup on the day after the procedure, unresponsive to conservative treatment. With ultrasonography, right phrenic nerve block was applied and 40% relief was achieved in the patient. Three days after the operation, left phrenic nerve block was applied and 100% relief was achieved. Hiccups did not recur in the follow-up (10).
In additon, there are publications showing temporary relief due to single application of phrenic nerve block (9,10). Renes et al. (8) administered local anesthetic infusion with a catheter for 24 hours with phrenic nerve block. They reported that when the infusion was stopped, the hiccup re-occured and that local anesthetic infusion was re-administered for 24 hours, and that at the end of the infusion, complete relief was observed (8). In the study of Kang and his colleagues, it was observed that temporary relief was provided by performing phrenic nerve block and that pulsed radiofrequency was applied accompanied by ultrasonography after phrenic nerve block and complete relief was achieved (5).
Hiccups lasted more than five weeks in our patient. Loss of appetite, vomiting, nutritional disorders and sleep disorders due to long-lasting hiccups were seen and the patient’s quality of life was corrupted. Because the patient was unable to respond to medical treatment, phrenic nerve block, a two-sided invasive treatment method, accompanied by ultrasonography and peripheral nerve stimulator, was applied to the patient. The severity and frequency of the hiccups of the patient decreased after the block. When hiccups started again after a rest period of about 1 month, the operation was repeated again and a significant improvement was observed in the quality of life of the patient. We thought that the hiccups were due to the recurrence of the tumor and the phrenic nerve irritation.
Conclusion
Persistent hiccup is not just a peculiar annoyance that the patient has caused; it also causes additional disturbances such as malnutrition, exhaustion, fatigue, weight loss, hypoxia, bradycardia, arrhythmia, heart block, disturbed sleep patterns, speech disorders, depression, weakness and dehydration. In cases of hiccup that does not respond to pharmacological treatment, bilateral phrenic nerve block provides permanent treatment. Phrenic nerve block can be considered in treatment of hiccups in patients with terminal cancer, especially with gastrointestinal tumors.
