Epinephrine - Ronny Allan - Living with Neuroendocrine Cancer

Tag: Epinephrine

A hormone and neurotransmitter, also known as adrenaline. Adrenaline and noradrenline are two separate but related hormones and neurotransmitters. They are produced in the centre (medulla) of the adrenal glands and in some neurons of the central nervous system. They are released into the bloodstream and serve as chemical mediators, and also convey the nerve impulses to various organs. Adrenaline has many different actions depending on the type of cells it is acting upon. However, the overall effect of adrenaline is to prepare the body for the ‘fight or flight’ response in times of stress, i.e. for vigorous and/or sudden action. Key actions of adrenaline include increasing the heart rate, increasing blood pressure, expanding the air passages of the lungs, enlarging the pupil in the eye (see photo), redistributing blood to the muscles and altering the body’s metabolism, so as to maximise blood glucose levels (primarily for the brain).

A closely related hormone, noradrenaline, is released mainly from the nerve endings of the sympathetic nervous system (as well as in relatively small amounts from the adrenal medulla). There is a continuous low level of activity of the sympathetic nervous system resulting in release of noradrenaline into the circulation, but adrenaline release is only increased at times of acute stress.

15Nov 2021 by Ronny Allan 4 Comments

Do we need a new model for Carcinoid Crisis in NETs?

Treatment

(so called) Carcinoid Crisis is one thing that tends to raise concerns in patients and has been bubbling away in NET centres and in patient communities for many years. One of the big problems I have found is trying to place boundaries on it in terms of which types of NET does it apply to. My thinking was that surely it only applies to those tumours which were once described by that ancient misnomer "carcinoid" and yet you hear patients who clearly do not have a tumour that was once described as "carcinoid" talk about it, at least in terms of protection against it. Perhaps some of the confusion lies with the ancient misnomer term, another reason why we need to get rid of it. Many texts I read describe it…

14Dec 2016 by Ronny Allan 4 Comments

Neuroendocrine Tumours: a spotlight on Pheochromocytoma and Paraganglioma

A spotlight on NENs - Types, Awareness, Patient Advocacy, Spotlight on NENs - Types Series

Updated 19th November 2023I spend a lot of time talking about the most common forms of Neuroendocrine Tumours (NETs), but what about the less well-known types? As part of my commitment to all types of NETs, I'd like to shine a light on two less common tumour types known as Pheochromocytomas and Paragangliomas - with an incidence rate of approximately 8 per million per year. They are normally grouped together, and the definitions below will confirm why. If you think it's difficult to diagnose a mainstream NET, this particular sub-type is a real challenge.So, let's get definitions out of the way:Pheochromocytomas (Pheo for short)Pheochromocytomas are tumours of the adrenal gland that produce excess adrenaline. They arise from the central portion of the adrenal gland, which is called the adrenal medulla…

05Dec 2016 by Ronny Allan 6 Comments

Neuroendocrine – don’t let it be a Crisis

Awareness, Living with Neuroendocrine Cancer, Patient Advocacy, Treatment

Update 15th November 2021. A study presented at NANETS 2021 produced data to suggest the causes and treatment for carcinoid crisis have been wrong and that a new model is required. Read the article here or by clicking on the picture.Author's note: This is probably a controversial conclusion in some circles and it's worth pointing out that so-called 'carcinoid crisis' isn't going away, just the need for time-consuming and expensive, and apparently ineffective according to the study, perioperative protection. And the study also noted that medication to treat complications was still required. I don't believe we should immediately dismiss this conclusion as one of the authors is a 'big hitter' NET Specialist surgeon (Dr Rodney Pommier) whose job is to keep patients safe on the operating table. The original article…

25May 2016 by Ronny Allan 5 Comments

The 5 E’s (of Carcinoid Syndrome)

Awareness, Diet and Nutrition, Living with Neuroendocrine Cancer, Patient Advocacy, Survivorship, Treatment

Since my diagnosis, I seem to have been in a perpetual learning phase! What not to do, what not to eat, what not to read! However, early on in my experience, I came across a list of 'E' words (5 of them) which is a handy reminder for Carcinoid Syndrome patients, particularly those whose symptoms are not under control. When I say "carcinoid syndrome" in this article, I only mean the syndrome that is caused by what was once called "Carcinoid Tumors", i.e. predominately serotonin secreting types which mainly metastatic cases where the well differentiated tumours are found in the small intestine, but much less commonly in appendiceal, very rarely in rectal (rarely even at stage IV), lung (more atypical and around 10%), and one or two other significantly less…

16Oct 2014 by Ronny Allan 14 Comments

Neuroendocrine Cancer – Horrible Hormones

Patient Advocacy

Hormonal imbalances are quite common in many conditions including day to day stuff. With Neuroendocrine Cancer, it can be a real challenge both at diagnostic and maintenance phases. In addition to the cancer angle, there's some strange stuff going on, inexplicable, frightening for the patient, an unwanted ingredient causing chaos!Until I was diagnosed with metastatic Neuroendocrine Cancer, I didn't have a clue about hormones - it's one of those things you just take for granted. However, hormones are vital to human health (male and female) and it's only when things go wrong you suddenly appreciate how important they are. Hormones are involved in many conditions, not just an issue with Neuroendocrine Tumours (NETs) but the presence of over-secreting hormones (often called peptides throughout) is useful to aid a diagnosis, albeit…