Tachyphasia is the medical term meaning rapid speech.
Fibrillation is the medical term meaning rapid uncoordinated shuddering of the heart.
tachypnea
Laryngopathy is the medical term meaning abnormality of the layrnx or voicebox.
Tachycardia
Precipitous delivery means rapid parturition.
Ventricular fibrillation is the term for rapid irregular contractions of the ventricles. Because the contractions are unsynchronized and random, the ventricles do not pump effectively. The patient may have no palpable pulse, and the condition can be fatal.
acute endocarditis
Echolalia is echoing or repeating speech you just heard.
tachypnea
Hyperventilation (hyper = a lot + ventilation = breathing) is a medical term. It is also known as "Rapid Breathing", "Deep Breathing" or "Overbreathing". The most common cause of spontaneous hyperventilation is anxiety or panic.
A vocal specialist is called a Speech Therapist
The inability to speak can be termed aphasia or aphonia depending on the circumstances.